Removal of Na₂SO₄ from a Filter Ash

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Results of an attempt to remove sulphur from filter ash by the wet procedure

Sample 5 (S5)	Mass (g)	Mass per cent (%)	Sulphur content (%)
	108.4	100.0	3.38
Insoluble material (5I)	72.5	66.9	0.56
Soluble material (5S)	35.9	33.1	8.39

Classification at a cut size of 20 μm

Sample 2 (S2)	Mass (g)	Mass per cent (%)	Sulphur content (%)
	251.7	100.0	3.38
Fine fraction (2F)	128.9	51.2	3.30
Coarse fraction (2C)	122.8	48.8	3.44

Classification at a cut size of 30 μm

Sample 3 (S3)	Mass (g)	Mass per cent (%)	Sulphur content (%)
	260.2	100.0	3.38
Fine fraction (3F)	195.4	75.1	3.71
Coarse fraction (3C)	64.8	24.9	2.32

Classification at a cut size of 10 μm

Sample 1 (S1)	Mass (g)	Mass per cent (%)	Sulphur content (%)
	258.4	100.0	3.38
Fine fraction (1F)	56.3	21.8	0.55
Coarse fraction (1C)	202.1	78.2	4.19

Density measurements with a pycnometer

Test no.	Density (kg/m3)
1	2,445.8
2	2,579.5
3	2,539.5

Classification at a cut size of 40 μm

Sample 4 (S4)	Mass (g)	Mass per cent (%)	Sulphur content (%)
	254.0	100.0	3.38
Fine fraction (4F)	198.8	78.3	3.49
Coarse fraction (4C)	55.2	21.7	2.81

Determination of operating conditions for the centrifugal air classifier using the operating diagram of the classifier

Cut size dTV (mm)	RPM n (min−1)	Airflow Q (m3/h)
10	8,900	46.1
20	5,200	49.8
30	4,100	50.9
40	3,500	51.5