[Grzesiak, P. (2006). Utilization of industrial waste from sulfuric acid production processes. Przem. Chem. 8-9, 1015-1019 (in Polish).]Search in Google Scholar
[Grzesiak, P. (2005). Vanadium catalysts for the oxidation of SO2. Poznań, Poland: WN IOR (in Polish).]Search in Google Scholar
[Mazurek, K., Białowicz, K. & Trypuć, M. (2010). Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution. Polish J. Chem. Technol. 1(12), 23-28, DOI: 10.2478/v10026-010-0005-2.10.2478/v10026-010-0005-2]Search in Google Scholar
[Grobela, M. & Grzesiak, P. (2007). The influence of iron compounds in the sulfuric acid catalyst on the SO2 oxidation process. Polish J. Chem. Technol. 1(9), 2-6, DOI: 10.2478/v10026-007-0002-2.10.2478/v10026-007-0002-2]Search in Google Scholar
[Grzesiak, P., Grobela, M. & Motała, M. (2007). The influence of the catalyst worktime on SO2 emission quantity from the sulfuric acid system and the catalyst waste material. Polish J. Chem. Technol. 3(9), 134-137, DOI: 10.2478/v10026-007-0073-0.10.2478/v10026-007-0073-0]Search in Google Scholar
[Trypuć, M., Mazurek, K., Kiełkowska, U. & Druzyński, S. (2007). Utilization of used contact masses from the oxidation state of sulfur(IV) oxide to sulfur(VI) oxide. Pol. J. Chem. Technol. 9(3), 26-28, DOI: 10.2478/v10026-007-0047-2.10.2478/v10026-007-0047-2]Search in Google Scholar
[Mazurek, K., Trypuć, M., Białowicz, K. & Drużyński, S. (2008). The influence of leaching solution pH and addition of peroxide hydrogen on the recovery of some components from the used vanadium catalyst with urea solutions. Pol. J. Chem. Technol. 10(4), 34-36, DOI: 10.2478/v10026-008-0044-0.10.2478/v10026-008-0044-0]Search in Google Scholar
[Mazurek, K., Białowicz, K. & Trypuć, M. (2010). Recovery of vanadium, potassium and iron from a spent catalyst using urea solution. Hydrometallurgy 103, 19-24, DOI: 10.1016/j.hydromet.2010.02.008.10.1016/j.hydromet.2010.02.008]Search in Google Scholar
[Khorfan, S., Wahoud, A. & Reda, Y. (2001). Recovery of vanadium pentaoxide from spent catalyst used in the manufacture of sulphuric acid. Periodica Polythechnica Ser. Chem. Eng. 45(2), 131-137.]Search in Google Scholar
[Mohanty, J., Rath, P. C., Bhattacharya, I. N. & Paramguru, R. K. (2011). The recovery of vanadium from spent catalyst: a case study. Mineral Processing and Extractive Metallurgy 120, 56-60, DOI: 10.1179/037195510X12772935654909.10.1179/037195510X12772935654909]Search in Google Scholar
[Zeng, L. & Cheng, C. Y. (2009). A literature review of the recovery of molybdenum and vanadium from spent hydrodesulphurization catalysts. Part I: metallurgical processes. Hydrometallurgy 98, 1-9, DOI: 10.1016/j.hydromet.2009.03.010.10.1016/j.hydromet.2009.03.010]Search in Google Scholar
[Zeng, L. & Cheng, C. Y. (2009). A literature review of the recovery of molybdenum and vanadium from spent hydrodesulphurization catalysts. Part II: separation and purification. Hydrometallurgy 98, 10-20, DOI:10.1016/j.hydromet.2009.03.012.10.1016/j.hydromet.2009.03.012]Search in Google Scholar
[Magnani, J. L., Kachan, G. C. & Ferreira, N. L. (2000). Vanadium recovery by leaching in spent catalyst for sulfuric acid production. Rev. Ciencia Technol. 8, 85-90.]Search in Google Scholar
[Tozano, L. J. & Juan, D. (2001). Teaching of vanadium from spent sulphuric acid catalysts. Miner. Eng. 5, 543-546, DOI:10.1016/S0892-6875(01)00042-5.10.1016/S0892-6875(01)00042-5]Search in Google Scholar
[Brouwer, P. (2006). Theory of XRF. Almelo, Netherlands: Panalytical.]Search in Google Scholar