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Volume 30 (2022): Edizione 3 (September 2022)

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Volume 29 (2021): Edizione 3 (September 2021)

Volume 29 (2021): Edizione 2 (June 2021)

Volume 29 (2021): Edizione 1 (March 2021)

Volume 28 (2020): Edizione 4 (December 2020)
Special Edizione: IMTech2020-INNOVATIVE MINING TECHNOLOGIES. Editors: Dariusz Prostański, Bartosz Polnik

Volume 28 (2020): Edizione 3 (September 2020)

Volume 28 (2020): Edizione 2 (June 2020)

Volume 28 (2020): Edizione 1 (March 2020)

Volume 27 (2019): Edizione 4 (December 2019)

Volume 27 (2019): Edizione 3 (September 2019)

Volume 27 (2019): Edizione 2 (June 2019)
Special Edizione: Technological Innovations in the Socio-Humanistic Context

Volume 27 (2019): Edizione 1 (March 2019)

Volume 26 (2018): Edizione 4 (December 2018)

Volume 26 (2018): Edizione 3 (September 2018)

Volume 26 (2018): Edizione 2 (June 2018)

Volume 26 (2018): Edizione 1 (March 2018)

Volume 25 (2017): Edizione 4 (December 2017)

Volume 25 (2017): Edizione 3 (September 2017)

Volume 25 (2017): Edizione 2 (June 2017)

Volume 25 (2017): Edizione 1 (March 2017)

Volume 24 (2016): Edizione 4 (December 2016)

Volume 23 (2016): Edizione 3 (September 2016)

Volume 22 (2016): Edizione 2 (June 2016)

Volume 21 (2016): Edizione 1 (March 2016)

Dettagli della rivista
Formato
Rivista
eISSN
2450-5781
Pubblicato per la prima volta
30 Mar 2017
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

Volume 28 (2020): Edizione 4 (December 2020)
Special Edizione: IMTech2020-INNOVATIVE MINING TECHNOLOGIES. Editors: Dariusz Prostański, Bartosz Polnik

Dettagli della rivista
Formato
Rivista
eISSN
2450-5781
Pubblicato per la prima volta
30 Mar 2017
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

15 Articoli
access type Accesso libero

Recovery of Metals from Printed Circuit Boards By Means of Electrostatic Separation

Pubblicato online: 17 Aug 2020
Pagine: 213 - 219

Astratto

Abstract

Without the use of appropriate recycling technologies, the growing amount of electronic waste in the world can be a threat to the development of new technologies, and in the case of improper waste management, may have a negative impact on the environment. This is due to the fact that this waste contains large amounts of valuable metals and toxic polymers. Therefore, it should be recycled in accordance with the assumptions of the circular economy. The methods of mechanical recovery of metals from electronic waste, including printed circuits, may be widely used in the future by waste management companies as well as metal production and processing companies. That is why, a well-known and easily applicable electrostatic separation (ES) method was used to recover metals from printed circuit boards. The grain class of 0.32 - 0.10 mm, obtained after grinding the boards, was fed to a separator. Feed and separation products were analyzed by means of ICP-AES, SEM/EDS and XRD. The concentrate yield obtained after electrostatic separation amounted to 32.3% of the feed. Its density was 11.1 g/cc. Out of the 91.44% elements identified in the concentrate, over 90% were metals. XRD, SEM observations and EDS analysis confirmed the presence of non-metallic materials in the concentrate. This relatively high content of impurities indicates the need to grind printed circuit board into grain classes smaller than 0.32-0.10 mm.

Parole chiave

  • electrostatic separation
  • metals recovery
  • PCB
  • SEM
  • XRD
access type Accesso libero

Recovery of Fine Coal Grains from Post-Mining Wastes with Use of Autogenous Suspending Bed Technology

Pubblicato online: 17 Aug 2020
Pagine: 220 - 227

Astratto

Abstract

In addition to rock waste post-mining waste dump sites also contain coal grains justifying treating the dump sites as secondary mineral deposits. The article presents the results of laboratory tests aimed at determining the possibility of using suspending bed technology to separate a combustible substance from post-mining waste of a 4-0 mm grain size. The test results showed the possibility of obtaining good quality coal concentrates from coal waste of a grain size of 4-1 mm. The need for desludging and densifying the feed for the classifier with an autogenic suspending bed in the case of coal waste beneficiation in a wide 4-0 mm grain size justifies the use of a two-chamber device or two separate classifiers for narrower grain size classes. Concepts of systems for the recovery of fine coal grains providing the use of the classifier with autogenous suspending bed for the density distribution of feeds with high ash content are presented. The concepts were developed for beneficiation of the material in a 4-0 mm grain class.

Parole chiave

  • classification
  • fine grains
  • post-mining wastes dump sites
  • suspending bed
access type Accesso libero

Integrated Commercialization Model of Research and Development Project Results

Pubblicato online: 17 Aug 2020
Pagine: 228 - 239

Astratto

Abstract

The need to undertake research work on the commercialization of results from scientific research and development projects emerged from the Author’s professional experience as well as the incomprehensive literature on the role of Polish research institutes in the process of technology transfer and commercialization of innovative solutions, in particular in the case of mining machinery and equipment. From the available literature, the commercialization of research results and technology transfer are analyzed from the perspectives of academia and entrepreneurs, but there is no analysis of this challenge from the perspective of the research institutes which create the majority of innovative solutions implemented in Poland. The research results presented in this article identify and highlight not only the main factors which facilitate knowledge transfer in the widest sense, but also the barriers which should be overcome. An integrated commercialization model of research results, developed by the Author, is described in the article. Some examples of other models, used to assess innovative technology transfer processes, i.e. Transfer model of the Cracow University of Technology, Jolly’s model, United model (science + market), Trzmielak’s linear – subsequent model, Network – interactive model and IpOp model, are also presented. Special attention is paid to the process of generating innovative ideas and to the area of efficient project management. Based on the integrated model, practical management recommendations for the successful commercialization of innovative solutions are given. It is highlighted that the integrated model can be treated as a diagnostic tool, enabling an efficient assessment of the transfer of research results and commercialization of innovative solutions.

Parole chiave

  • commercialization
  • innovation
  • integrated model
  • research institute
  • technology transfer
access type Accesso libero

Determination of Rare Earth Elements Content in Hard Coal Type 31.1

Pubblicato online: 17 Aug 2020
Pagine: 240 - 246

Astratto

Abstract

The aim of the article is to present the results of laboratory analyses determining the content of rare earth elements (REE) in hard coal type 31.1. Coal was extracted directly from the mining excavation located in the Upper Silesian Coal Basin. Mass spectrometry tests with ionization in inductively coupled plasma (ICP-MS), were aimed at the quantitative analysis of the share of REE in coal, taking into account the economic aspects of recovery of these elements. Fine ground hard coal samples and ashes obtained after coal burning were assessed for the rare earth elements concentration. Results of the rare earth elements concentration (lanthanum and cerium) in hard coal are similar in the values obtained in previous tests. The current analyses present higher concentration of europium or neodymium. The article also contains the concept of possible future research work, consisting in the recovery of rare earth elements using, among others, a classifying hydrocyclone.

Parole chiave

  • mining industry
  • processing of hard coal
  • rare earth elements (REE)
access type Accesso libero

The Method of High Accuracy Calculation of Robot Trajectory for the Complex Curves

Pubblicato online: 17 Aug 2020
Pagine: 247 - 252

Astratto

Abstract

The geometric model accuracy is crucial for product design. More complex surfaces are represented by the approximation methods. On the contrary, the approximation methods reduce the design quality. A new alternative calculation method is proposed. The new method can calculate both conical sections and more complex curves. The researcher is able to get an analytical solution and not a sequence of points with the destruction of the object semantics. The new method is based on permutation and other symmetries and should have an origin in the internal properties of the space. The classical method consists of finding transformation parameters for symmetrical conic profiles, however a new procedure for parameters of linear transformations determination was acquired by another method. The main steps of the new method are theoretically presented in the paper. Since a double result is obtained in most stages, the new calculation method is easy to verify. Geometric modeling in the AutoCAD environment is shown briefly. The new calculation method can be used for most complex curves and linear transformations. Theoretical and practical researches are required additionally.

Parole chiave

  • analytical method
  • linear transformations
  • planar complex curves
  • symmetries
access type Accesso libero

Energy Recuperation as One of the Factors Improving the Energy Efficiency of Mining Battery Locomotives

Pubblicato online: 17 Aug 2020
Pagine: 253 - 258

Astratto

Abstract

Mining industry is currently one of the biggest industries in the world. All mines produce “indispensable” minerals, starting from fuels such as coal and ending with noble metals such as gold or copper. Mines in the world compete in the volumes of mined minerals what requires use of state-of-the-art, more efficient and, and what is more important, safer machines. Such trend favors development of technology and mobilize engineers to adapt the technologies that were used so far in easier environment to the needs of the mining industry.

The article presents the issue of energy recuperation in mining battery locomotives. Simulation tests of the power supply and control system of the Lea type battery locomotive are discussed. The results of tests on the electric energy consumption of the locomotive during the operational change in the mine were presented, which were referred to the simulation results. Factors influencing the efficiency of energy recovery and the risk resulting from hydrogen emission in the recuperation process have been indicated. Also discussed is the study of the concentration of hydrogen concentration emitted from the battery of lead-acid cells during their recharging in the process of electrical braking with energy recuperation.

Parole chiave

  • battery supply
  • energy recuperation
  • hydrogen emission
  • mine locomotive unit
  • PMSM drive
access type Accesso libero

New Implementations of Komag Jigs for Coking and Steam Coal in Collaboration with Carbo-Eco and Fugor Companies

Pubblicato online: 17 Aug 2020
Pagine: 259 - 267

Astratto

Abstract

The basic process of minerals’ mechanical preparation, including coal, is a beneficiation process which has a decisive impact on quantitative-and-qualitative parameters of commercial products. At present the products of the MBE-CMT, Allmineral and Tenova companies have big market shares as regards foreign water pulsatory jigs, as well as ITG KOMAG on the local Polish market. New implementations of jigs, developed at the KOMAG Institute of Mining Technology, for beneficiation of coking coal and steam coal in collaboration with Carbo-Eco Ltd. and Fugor Ltd. companies, were realized in 2019. Technical and technological parameters of new devices are described in the article. Supply systems of feed are presented as well as the method of collecting tailings and middlings. New design solutions, applied in modernized preparation plants, aimed at an improvement of jigs production capacity and efficiency are presented. In the case of each jig, after its activation and conducted adjusting processes, exact tests of a beneficiation efficiency were performed and their results are presented in the tabular form. Basic beneficiation accuracy indicators and parameters of products’ separation as well as balances of products are given. The test results, obtained from newly activated jigs, are discussed.

Parole chiave

  • beneficiation process
  • hard coal
  • jig
access type Accesso libero

Methods for Computer Aiding the Configuration and Assessment of Auxiliary Mine Transportation Means

Pubblicato online: 17 Aug 2020
Pagine: 268 - 275

Astratto

Abstract

Mine transportation of materials in underground mine workings is realized by mine underground railways as well as by suspended monorails or floor-mounted railway. Transportation is realized on tracks placed on the floor of working or on rails suspended to roadway support. Each transport operation must be preceded by a transport design project, made in accordance with obligatory legislation. A part of the project are traction calculations. Their implementation in a computer program allows for minimization of the possibility of errors during the configuration of suspended queues and conducting traction calculations, which consequently leads to improve the level of safety. The article discusses the modular Safe Trans Design system, supporting the design of auxiliary mine transportation. The system has been implemented in the mines of JSW S.A. The assumptions and structure of the system as well as algorithms of operation of the ‘configurator of transportation sets’ and ‘assessment and reporting module’ are presented. The method of creating an auxiliary mine transportation system project is presented. Safe Trans Design system is used in planning, organizational and training activities implemented as part of transport safety management in mining plants. Developed methods can be easily adapted to other legislations of hard coal producers’ countries, where suspended monorails are used in underground auxiliary mining transportation systems.

Parole chiave

  • computer aiding system
  • suspended monorail transportation
  • traction calculations
  • underground mining
access type Accesso libero

Trenchless Execution of Microtunnels for Municipal Infrastructure in Urbanized Site – Conception of a New Solution

Pubblicato online: 17 Aug 2020
Pagine: 276 - 282

Astratto

Abstract

The technologies for trenchless execution of mini and microtunnels for an installation of municipal infrastructure in urbanized sites, used at present, are described in the article. The emphasis is laid on uncontrolled methods, in the case of the diameters of installations which do not exceed 200-250 mm and their length not bigger than 30-40 m. Some issues connected with making the installations of this type, using conventional methods, are also presented. A conception of equipment (ground rocket) for an trenchless execution of short-distance microtunnels of the diameter up to 200 mm and the length up to 30 m with an innovative electric drive, developed at the Department of Machinery Engineering and Transport of the AGH in Cracow as an alternative for the solutions applied nowadays, is described. An electric linear motor, whose conception is presented in the article, was installed in the head of the device. The goal of these works was possibility of using new solution of ground rocket without additional equipments for pneumatic supply with compressed air. New concept of proposed ground rocket can be used with feeding directly from the domestic electric network. The device is intended for execution of installation in incoherent and low-compact ground.

Parole chiave

  • microtunnelling
  • trenchless methods
  • ground rocket
  • municipal infrastructure
access type Accesso libero

Design with Use of 3D Printing Technology

Pubblicato online: 17 Aug 2020
Pagine: 283 - 291

Astratto

Abstract

Dynamic development of 3D printing technology contributes to its wide applicability. FDM (Fused Deposition Method) is the most known and popular 3D printing method due to its availability and affordability. It is also usable in design of technical objects – to verify design concepts with use of 3D printed prototypes. The prototypes are produced at lower cost and shorter time comparing to other manufacturing methods and might be used for a number of purposes depending on designed object’s features they reflect. In the article, usability of 3D printing method FDM for designing of technical objects is verified based on sample functional prototypes. Methodology applied to develop these prototypes and their stand tests are covered. General conclusion is that 3D printed prototypes manufactured with FDM method proved to be useful for verifying new concepts within design processes carried out in KOMAG.

Parole chiave

  • 3D printing
  • additive manufacturing
  • design
  • design process
  • FDM (Fused Deposition Method)
  • prototype
access type Accesso libero

Maximizing the Productivity of a Gas Melting Furnace with Regard to the Ecological Efficiency of its Operation

Pubblicato online: 17 Aug 2020
Pagine: 292 - 297

Astratto

Abstract

Due to the implementation of environmental regulations and the continual tightening up of the limits for pollutants in combustion systems, we are being forced to pay more attention to this area. A significant source of pollutants originating from the industry is, in particular, the formation of carbon dioxide (CO2) and nitrogen oxides (NOx) in combustion systems with air intake. The control of pollutant emissions has become a global concern due to the worldwide increase in the use of fossil fuels. Besides the fact that the insufficient combustion process has a significant share of emissions in the environment, it also reduces the overall efficiency and economy of the operation using this energy source. We encounter this problem also in the operation of gas melting furnaces. Therefore, the aim of this paper was to describe the results of experimental measurements of the amount of emissions produced during the gas melting furnace KOV 010/1998 operation, which is in practice predominantly used for the melting of Aluminium alloys. Experimental measurements were performed to design the most appropriate operating mode variant of the melting furnace with regard to maximizing its productivity and at the same time to minimizing the total amount of emissions produced during one melting cycle.

Parole chiave

  • gas melting furnace
  • emission
  • power
  • efficiency
  • combustion process
access type Accesso libero

Gas Flow Simulation in the Working Gap of Impulse Gas-Barrier Face Seal

Pubblicato online: 17 Aug 2020
Pagine: 298 - 303

Astratto

Abstract

Numerical simulation method of the working process of a centrifugal unit contactless face impulse seal is proposed. A seal functioning physical model was created. Its operation key aspects that are not taken into account in the traditional methods of calculating contactless impulse seals are identified. A numerical simulation of seal working process based on the Reynolds equation solution for the medium vortex-free motion in the gap between moving surfaces is proposed. Hypothesis that simplify the equation’s numerical solution for the face impulse seal is formulated. The numerical solution is obtained using the boundary element method. Based on the obtained numerical solution, the distribution of the working medium pressure field in the seal gap is simulated.

Parole chiave

  • impulse gas seal
  • barrier gas
  • boundary element method
  • pressure distribution
access type Accesso libero

Enhancing Efficiency by Implementation of Integrated Management System in Order to Align Organisational Culture and Daily Practice

Pubblicato online: 17 Aug 2020
Pagine: 304 - 311

Astratto

Abstract

The main aim of presented article is present methodology how sophisticated products as compressor equipment can be considered and analyzed as a complex technical system which consists of jointly operating components – a set of hardware, software, operational staff and documented information. In process modeling, these components can be in different processes of inputs, outputs, mechanisms (resources) or management. Based on the regulatory requirements for each component of the system, a key indicator efficiency can be identified. This will allow to control the process and make appropriate decisions to improve the system. The application of the proposed methodology for the development and implementation of an integrated management system reduce the cost of resources and significantly improve the quality of the implementation of processes.

Parole chiave

  • complex technical system
  • integrated management system
  • standards
  • sustainable operations
  • product lifecycle management (PLM)
access type Accesso libero

Economic Impact of Industrial Segment in the Selected Country

Pubblicato online: 17 Aug 2020
Pagine: 312 - 317

Astratto

Abstract

The inducted paper discusses economic effect resulting from industrial activities realized within national economy of the chosen country. The country of selection represents Poland. Economic impact is scrutinized through reflexing on gross domestic product. Industrial segment is deputized over various indicators whose scope strives to include different views on the industry field. The main point of this paper is to identify the exact relationship between dependent variable (gross domestic product) and a group of independent variables (picked industrial representatives). Such determination offers thereafter the possibility to estimate dependent variable’s value and its next forecast. What is more, the eventual sorting of involved industrial indicators is facilitated according to their importance. The multiple regression analysis is utilized as the method of investigation. Findings answer the stated questions and aims with a suggestion of an appropriate equation.

Parole chiave

  • economic impact
  • gross domestic product
  • industrial segment
  • multiple regression analysis
  • national economy
access type Accesso libero

ZnO Coatings on Ti6Al4V Substrate: Structural and Antibacterial Properties in Literature Review and Research

Pubblicato online: 17 Aug 2020
Pagine: 318 - 324

Astratto

Abstract

ZnO, ZnO/Alginate coatings were obtained on the pre-anodized Ti6Al4V substrates by the thermal substrate deposition method (TSD). In the frame of this work, the TSD method was at first applied for obtaining ZnO coating from aqueous alginate-containing and alginate-free solutions on a metal surface. XRD, SEM analyses show that the biopolymer has a significant influence on the formation of the coating, their morphology, texture, structure of ZnO nanoparticles. The average rate of ZnO deposition from alginate containing solution is 30 μm/min, while from alginate-free solutions – 6 μm/min. In the presence of alginate, spherical particles with flower-shaped inclusions are formed, while from the polymer-free solution, single crystals in the form of tetrahedral were obtained. Zone of inhibition test against Gram-positive S. aureus ATCC 25923 and Gram-negative E. coli ATCC 25922 proves the antibacterial activity of the ZnO/Alg coatings.

Parole chiave

  • thermal substrate deposition
  • zinc oxide
  • alginate
  • coating
  • antimicrobial activity
15 Articoli
access type Accesso libero

Recovery of Metals from Printed Circuit Boards By Means of Electrostatic Separation

Pubblicato online: 17 Aug 2020
Pagine: 213 - 219

Astratto

Abstract

Without the use of appropriate recycling technologies, the growing amount of electronic waste in the world can be a threat to the development of new technologies, and in the case of improper waste management, may have a negative impact on the environment. This is due to the fact that this waste contains large amounts of valuable metals and toxic polymers. Therefore, it should be recycled in accordance with the assumptions of the circular economy. The methods of mechanical recovery of metals from electronic waste, including printed circuits, may be widely used in the future by waste management companies as well as metal production and processing companies. That is why, a well-known and easily applicable electrostatic separation (ES) method was used to recover metals from printed circuit boards. The grain class of 0.32 - 0.10 mm, obtained after grinding the boards, was fed to a separator. Feed and separation products were analyzed by means of ICP-AES, SEM/EDS and XRD. The concentrate yield obtained after electrostatic separation amounted to 32.3% of the feed. Its density was 11.1 g/cc. Out of the 91.44% elements identified in the concentrate, over 90% were metals. XRD, SEM observations and EDS analysis confirmed the presence of non-metallic materials in the concentrate. This relatively high content of impurities indicates the need to grind printed circuit board into grain classes smaller than 0.32-0.10 mm.

Parole chiave

  • electrostatic separation
  • metals recovery
  • PCB
  • SEM
  • XRD
access type Accesso libero

Recovery of Fine Coal Grains from Post-Mining Wastes with Use of Autogenous Suspending Bed Technology

Pubblicato online: 17 Aug 2020
Pagine: 220 - 227

Astratto

Abstract

In addition to rock waste post-mining waste dump sites also contain coal grains justifying treating the dump sites as secondary mineral deposits. The article presents the results of laboratory tests aimed at determining the possibility of using suspending bed technology to separate a combustible substance from post-mining waste of a 4-0 mm grain size. The test results showed the possibility of obtaining good quality coal concentrates from coal waste of a grain size of 4-1 mm. The need for desludging and densifying the feed for the classifier with an autogenic suspending bed in the case of coal waste beneficiation in a wide 4-0 mm grain size justifies the use of a two-chamber device or two separate classifiers for narrower grain size classes. Concepts of systems for the recovery of fine coal grains providing the use of the classifier with autogenous suspending bed for the density distribution of feeds with high ash content are presented. The concepts were developed for beneficiation of the material in a 4-0 mm grain class.

Parole chiave

  • classification
  • fine grains
  • post-mining wastes dump sites
  • suspending bed
access type Accesso libero

Integrated Commercialization Model of Research and Development Project Results

Pubblicato online: 17 Aug 2020
Pagine: 228 - 239

Astratto

Abstract

The need to undertake research work on the commercialization of results from scientific research and development projects emerged from the Author’s professional experience as well as the incomprehensive literature on the role of Polish research institutes in the process of technology transfer and commercialization of innovative solutions, in particular in the case of mining machinery and equipment. From the available literature, the commercialization of research results and technology transfer are analyzed from the perspectives of academia and entrepreneurs, but there is no analysis of this challenge from the perspective of the research institutes which create the majority of innovative solutions implemented in Poland. The research results presented in this article identify and highlight not only the main factors which facilitate knowledge transfer in the widest sense, but also the barriers which should be overcome. An integrated commercialization model of research results, developed by the Author, is described in the article. Some examples of other models, used to assess innovative technology transfer processes, i.e. Transfer model of the Cracow University of Technology, Jolly’s model, United model (science + market), Trzmielak’s linear – subsequent model, Network – interactive model and IpOp model, are also presented. Special attention is paid to the process of generating innovative ideas and to the area of efficient project management. Based on the integrated model, practical management recommendations for the successful commercialization of innovative solutions are given. It is highlighted that the integrated model can be treated as a diagnostic tool, enabling an efficient assessment of the transfer of research results and commercialization of innovative solutions.

Parole chiave

  • commercialization
  • innovation
  • integrated model
  • research institute
  • technology transfer
access type Accesso libero

Determination of Rare Earth Elements Content in Hard Coal Type 31.1

Pubblicato online: 17 Aug 2020
Pagine: 240 - 246

Astratto

Abstract

The aim of the article is to present the results of laboratory analyses determining the content of rare earth elements (REE) in hard coal type 31.1. Coal was extracted directly from the mining excavation located in the Upper Silesian Coal Basin. Mass spectrometry tests with ionization in inductively coupled plasma (ICP-MS), were aimed at the quantitative analysis of the share of REE in coal, taking into account the economic aspects of recovery of these elements. Fine ground hard coal samples and ashes obtained after coal burning were assessed for the rare earth elements concentration. Results of the rare earth elements concentration (lanthanum and cerium) in hard coal are similar in the values obtained in previous tests. The current analyses present higher concentration of europium or neodymium. The article also contains the concept of possible future research work, consisting in the recovery of rare earth elements using, among others, a classifying hydrocyclone.

Parole chiave

  • mining industry
  • processing of hard coal
  • rare earth elements (REE)
access type Accesso libero

The Method of High Accuracy Calculation of Robot Trajectory for the Complex Curves

Pubblicato online: 17 Aug 2020
Pagine: 247 - 252

Astratto

Abstract

The geometric model accuracy is crucial for product design. More complex surfaces are represented by the approximation methods. On the contrary, the approximation methods reduce the design quality. A new alternative calculation method is proposed. The new method can calculate both conical sections and more complex curves. The researcher is able to get an analytical solution and not a sequence of points with the destruction of the object semantics. The new method is based on permutation and other symmetries and should have an origin in the internal properties of the space. The classical method consists of finding transformation parameters for symmetrical conic profiles, however a new procedure for parameters of linear transformations determination was acquired by another method. The main steps of the new method are theoretically presented in the paper. Since a double result is obtained in most stages, the new calculation method is easy to verify. Geometric modeling in the AutoCAD environment is shown briefly. The new calculation method can be used for most complex curves and linear transformations. Theoretical and practical researches are required additionally.

Parole chiave

  • analytical method
  • linear transformations
  • planar complex curves
  • symmetries
access type Accesso libero

Energy Recuperation as One of the Factors Improving the Energy Efficiency of Mining Battery Locomotives

Pubblicato online: 17 Aug 2020
Pagine: 253 - 258

Astratto

Abstract

Mining industry is currently one of the biggest industries in the world. All mines produce “indispensable” minerals, starting from fuels such as coal and ending with noble metals such as gold or copper. Mines in the world compete in the volumes of mined minerals what requires use of state-of-the-art, more efficient and, and what is more important, safer machines. Such trend favors development of technology and mobilize engineers to adapt the technologies that were used so far in easier environment to the needs of the mining industry.

The article presents the issue of energy recuperation in mining battery locomotives. Simulation tests of the power supply and control system of the Lea type battery locomotive are discussed. The results of tests on the electric energy consumption of the locomotive during the operational change in the mine were presented, which were referred to the simulation results. Factors influencing the efficiency of energy recovery and the risk resulting from hydrogen emission in the recuperation process have been indicated. Also discussed is the study of the concentration of hydrogen concentration emitted from the battery of lead-acid cells during their recharging in the process of electrical braking with energy recuperation.

Parole chiave

  • battery supply
  • energy recuperation
  • hydrogen emission
  • mine locomotive unit
  • PMSM drive
access type Accesso libero

New Implementations of Komag Jigs for Coking and Steam Coal in Collaboration with Carbo-Eco and Fugor Companies

Pubblicato online: 17 Aug 2020
Pagine: 259 - 267

Astratto

Abstract

The basic process of minerals’ mechanical preparation, including coal, is a beneficiation process which has a decisive impact on quantitative-and-qualitative parameters of commercial products. At present the products of the MBE-CMT, Allmineral and Tenova companies have big market shares as regards foreign water pulsatory jigs, as well as ITG KOMAG on the local Polish market. New implementations of jigs, developed at the KOMAG Institute of Mining Technology, for beneficiation of coking coal and steam coal in collaboration with Carbo-Eco Ltd. and Fugor Ltd. companies, were realized in 2019. Technical and technological parameters of new devices are described in the article. Supply systems of feed are presented as well as the method of collecting tailings and middlings. New design solutions, applied in modernized preparation plants, aimed at an improvement of jigs production capacity and efficiency are presented. In the case of each jig, after its activation and conducted adjusting processes, exact tests of a beneficiation efficiency were performed and their results are presented in the tabular form. Basic beneficiation accuracy indicators and parameters of products’ separation as well as balances of products are given. The test results, obtained from newly activated jigs, are discussed.

Parole chiave

  • beneficiation process
  • hard coal
  • jig
access type Accesso libero

Methods for Computer Aiding the Configuration and Assessment of Auxiliary Mine Transportation Means

Pubblicato online: 17 Aug 2020
Pagine: 268 - 275

Astratto

Abstract

Mine transportation of materials in underground mine workings is realized by mine underground railways as well as by suspended monorails or floor-mounted railway. Transportation is realized on tracks placed on the floor of working or on rails suspended to roadway support. Each transport operation must be preceded by a transport design project, made in accordance with obligatory legislation. A part of the project are traction calculations. Their implementation in a computer program allows for minimization of the possibility of errors during the configuration of suspended queues and conducting traction calculations, which consequently leads to improve the level of safety. The article discusses the modular Safe Trans Design system, supporting the design of auxiliary mine transportation. The system has been implemented in the mines of JSW S.A. The assumptions and structure of the system as well as algorithms of operation of the ‘configurator of transportation sets’ and ‘assessment and reporting module’ are presented. The method of creating an auxiliary mine transportation system project is presented. Safe Trans Design system is used in planning, organizational and training activities implemented as part of transport safety management in mining plants. Developed methods can be easily adapted to other legislations of hard coal producers’ countries, where suspended monorails are used in underground auxiliary mining transportation systems.

Parole chiave

  • computer aiding system
  • suspended monorail transportation
  • traction calculations
  • underground mining
access type Accesso libero

Trenchless Execution of Microtunnels for Municipal Infrastructure in Urbanized Site – Conception of a New Solution

Pubblicato online: 17 Aug 2020
Pagine: 276 - 282

Astratto

Abstract

The technologies for trenchless execution of mini and microtunnels for an installation of municipal infrastructure in urbanized sites, used at present, are described in the article. The emphasis is laid on uncontrolled methods, in the case of the diameters of installations which do not exceed 200-250 mm and their length not bigger than 30-40 m. Some issues connected with making the installations of this type, using conventional methods, are also presented. A conception of equipment (ground rocket) for an trenchless execution of short-distance microtunnels of the diameter up to 200 mm and the length up to 30 m with an innovative electric drive, developed at the Department of Machinery Engineering and Transport of the AGH in Cracow as an alternative for the solutions applied nowadays, is described. An electric linear motor, whose conception is presented in the article, was installed in the head of the device. The goal of these works was possibility of using new solution of ground rocket without additional equipments for pneumatic supply with compressed air. New concept of proposed ground rocket can be used with feeding directly from the domestic electric network. The device is intended for execution of installation in incoherent and low-compact ground.

Parole chiave

  • microtunnelling
  • trenchless methods
  • ground rocket
  • municipal infrastructure
access type Accesso libero

Design with Use of 3D Printing Technology

Pubblicato online: 17 Aug 2020
Pagine: 283 - 291

Astratto

Abstract

Dynamic development of 3D printing technology contributes to its wide applicability. FDM (Fused Deposition Method) is the most known and popular 3D printing method due to its availability and affordability. It is also usable in design of technical objects – to verify design concepts with use of 3D printed prototypes. The prototypes are produced at lower cost and shorter time comparing to other manufacturing methods and might be used for a number of purposes depending on designed object’s features they reflect. In the article, usability of 3D printing method FDM for designing of technical objects is verified based on sample functional prototypes. Methodology applied to develop these prototypes and their stand tests are covered. General conclusion is that 3D printed prototypes manufactured with FDM method proved to be useful for verifying new concepts within design processes carried out in KOMAG.

Parole chiave

  • 3D printing
  • additive manufacturing
  • design
  • design process
  • FDM (Fused Deposition Method)
  • prototype
access type Accesso libero

Maximizing the Productivity of a Gas Melting Furnace with Regard to the Ecological Efficiency of its Operation

Pubblicato online: 17 Aug 2020
Pagine: 292 - 297

Astratto

Abstract

Due to the implementation of environmental regulations and the continual tightening up of the limits for pollutants in combustion systems, we are being forced to pay more attention to this area. A significant source of pollutants originating from the industry is, in particular, the formation of carbon dioxide (CO2) and nitrogen oxides (NOx) in combustion systems with air intake. The control of pollutant emissions has become a global concern due to the worldwide increase in the use of fossil fuels. Besides the fact that the insufficient combustion process has a significant share of emissions in the environment, it also reduces the overall efficiency and economy of the operation using this energy source. We encounter this problem also in the operation of gas melting furnaces. Therefore, the aim of this paper was to describe the results of experimental measurements of the amount of emissions produced during the gas melting furnace KOV 010/1998 operation, which is in practice predominantly used for the melting of Aluminium alloys. Experimental measurements were performed to design the most appropriate operating mode variant of the melting furnace with regard to maximizing its productivity and at the same time to minimizing the total amount of emissions produced during one melting cycle.

Parole chiave

  • gas melting furnace
  • emission
  • power
  • efficiency
  • combustion process
access type Accesso libero

Gas Flow Simulation in the Working Gap of Impulse Gas-Barrier Face Seal

Pubblicato online: 17 Aug 2020
Pagine: 298 - 303

Astratto

Abstract

Numerical simulation method of the working process of a centrifugal unit contactless face impulse seal is proposed. A seal functioning physical model was created. Its operation key aspects that are not taken into account in the traditional methods of calculating contactless impulse seals are identified. A numerical simulation of seal working process based on the Reynolds equation solution for the medium vortex-free motion in the gap between moving surfaces is proposed. Hypothesis that simplify the equation’s numerical solution for the face impulse seal is formulated. The numerical solution is obtained using the boundary element method. Based on the obtained numerical solution, the distribution of the working medium pressure field in the seal gap is simulated.

Parole chiave

  • impulse gas seal
  • barrier gas
  • boundary element method
  • pressure distribution
access type Accesso libero

Enhancing Efficiency by Implementation of Integrated Management System in Order to Align Organisational Culture and Daily Practice

Pubblicato online: 17 Aug 2020
Pagine: 304 - 311

Astratto

Abstract

The main aim of presented article is present methodology how sophisticated products as compressor equipment can be considered and analyzed as a complex technical system which consists of jointly operating components – a set of hardware, software, operational staff and documented information. In process modeling, these components can be in different processes of inputs, outputs, mechanisms (resources) or management. Based on the regulatory requirements for each component of the system, a key indicator efficiency can be identified. This will allow to control the process and make appropriate decisions to improve the system. The application of the proposed methodology for the development and implementation of an integrated management system reduce the cost of resources and significantly improve the quality of the implementation of processes.

Parole chiave

  • complex technical system
  • integrated management system
  • standards
  • sustainable operations
  • product lifecycle management (PLM)
access type Accesso libero

Economic Impact of Industrial Segment in the Selected Country

Pubblicato online: 17 Aug 2020
Pagine: 312 - 317

Astratto

Abstract

The inducted paper discusses economic effect resulting from industrial activities realized within national economy of the chosen country. The country of selection represents Poland. Economic impact is scrutinized through reflexing on gross domestic product. Industrial segment is deputized over various indicators whose scope strives to include different views on the industry field. The main point of this paper is to identify the exact relationship between dependent variable (gross domestic product) and a group of independent variables (picked industrial representatives). Such determination offers thereafter the possibility to estimate dependent variable’s value and its next forecast. What is more, the eventual sorting of involved industrial indicators is facilitated according to their importance. The multiple regression analysis is utilized as the method of investigation. Findings answer the stated questions and aims with a suggestion of an appropriate equation.

Parole chiave

  • economic impact
  • gross domestic product
  • industrial segment
  • multiple regression analysis
  • national economy
access type Accesso libero

ZnO Coatings on Ti6Al4V Substrate: Structural and Antibacterial Properties in Literature Review and Research

Pubblicato online: 17 Aug 2020
Pagine: 318 - 324

Astratto

Abstract

ZnO, ZnO/Alginate coatings were obtained on the pre-anodized Ti6Al4V substrates by the thermal substrate deposition method (TSD). In the frame of this work, the TSD method was at first applied for obtaining ZnO coating from aqueous alginate-containing and alginate-free solutions on a metal surface. XRD, SEM analyses show that the biopolymer has a significant influence on the formation of the coating, their morphology, texture, structure of ZnO nanoparticles. The average rate of ZnO deposition from alginate containing solution is 30 μm/min, while from alginate-free solutions – 6 μm/min. In the presence of alginate, spherical particles with flower-shaped inclusions are formed, while from the polymer-free solution, single crystals in the form of tetrahedral were obtained. Zone of inhibition test against Gram-positive S. aureus ATCC 25923 and Gram-negative E. coli ATCC 25922 proves the antibacterial activity of the ZnO/Alg coatings.

Parole chiave

  • thermal substrate deposition
  • zinc oxide
  • alginate
  • coating
  • antimicrobial activity

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