C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
53/19, 53/22
C22C 33/00 (2006.01) C22B 1/04 (2006.01) C22B 1/06 (2006.01) C22B 3/08 (2006.01) C22B 3/10 (2006.01) C22B 7/02 (2006.01) C22B 13/08 (2006.01)
Patent
CA 1160055
ABSTRACT OF THE DISCLOSURE A process for the recovery of metal values from impure finely-divided pyrite either directly or by first smelting the pyrite with the aid of non-oxidizing gases at an elevated temperature in order to produce an iron matte with a valuable-metal content and dusty gases is disclosed wherein a) part of the pyrite or iron matte which contains valuable metals is first subjected to an oxidizing roasting and thereafter, together with the remainder of the pyrite or iron matte, to a sulfatizing roasting in order to convert the valuable metals present in the pyrite and its roasting residue or in the iron matte to a sulfate form and the iron to an oxide form, whereafter the sulfates are leached and the obtained solution is separated in order to recover the valuable metals from the solution, and the insoluble iron oxide is used for iron production; b) the dusts which contain valuable metals are separated from the gases; c) the separated dusts are fed directly to the sulfatizing roasting of step a) after any arsenic present therein has first been removed; or the separated dusts are directed to a separate sulfatizing roasting in order to convert the valuable metals to sulfate form and the iron to oxide form, whereafter the sulfates are leached in accordance with step a) and the insoluble, arsenic-bearing iron oxide is rejected; and d) the sulfur is condensed from the gases.
373342
Aaltonen Olavi A.
Asteljoki Jussi A.
Fugleberg Sigmund P.
Heimala Seppo O.
Karpale Kauko J.
Fetherstonhaugh & Co.
Outokumpu Oy
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