Study of Zinc Sulfide Concentrates by DTA, TGA, and X-Ray Analyses and Their Roasting in Fluidized Bed Furnace

Table 3

Results from the calculation of zinc concentrate charges and chemical and phase composition of the best charge and prognostic calcine.

Charge composition from concentrate 𝑁 and % of it
Concentrate 1		Concentrate 2		Concentrate 3		Concentrate 4		Concentrate 5
50		20		5		5		20
Calculated chemical composition of charge, mass %
Zn	S	Fe	SiO2	Pb	Cu	Cd	As	Sb
54.61	32.71	6.98	2.20	1. 43	1.00	0.25	0.040	0.006
Co	Ni	CaO	MgO	Al2O3	Cl	F	Ge	Tl
0.023	0.003	0.42	0.14	0.15	0.011	0.012	12 g/t	10 g/t
Prognostic chemical composition of zinc calcine, mass %
Zn	S	Fe	SiO2	Pb	Cu	Cd	As	Sb
62.77	3.01	8.02	2.52	1.54	1.15	0.29	0.046	0.006
Co	Ni	CaO	MgO	Al2O3	Cl	F	Ge	Tl
0.027	0.003	0.48	0.17	0.17	0.013	0.014	14 g/t	12 g/t
Prognostic phase composition of zinc calcine, mass %
Zn (oxide + silicate)		55.31		ZnH2O			2.82
Zn (ferrite)		4.01		Fe (ferrite)			7.86
Zn (sulphate)		2.82		Fe (oxide + silicate)			0.16
Zn (sulphide)		0.63		Pb (sulphate)			1.23
ZnH2SO4		58.13		Pb (sulphide)			0.31