Method for roasting sulphide ores

Details Method for roasting sulphide ores Method for roasting sulphide ores

1991-12-17

1993-10-19

Brunsman, David

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 23, 423 29, 423 47, 4235611, C01G 700, C01G 500, C01G 312, C01G 112

Patent

active

052543200

ABSTRACT:
A method for roasting sulphide ores or ore concentrates containing precious metals is practiced in a furnace, typically in a fluidized bed. The ore and a sulphur-binding lime-containing material are supplied to a roasting furnace in which the ore is roasted with the emission of heat and sulphur dioxide. The lime-containing material--such as calcium hydroxide--is mixed into the cooling water for the roasting furnace and sprayed into the furnace as a lime-containing aqueous slurry. Roasting occurs at about 600-850.degree. C. (e.g. 650-750.degree. C.).
Roasted material is discharged from the furnace and acted upon to recover gold, silver and copper metal.

REFERENCES:
patent: 1377012 (1921-05-01), Howard
patent: 2650159 (1953-08-01), Tarr, Jr. et al.
patent: 4615729 (1986-10-01), Victorovich et al.
patent: 4670228 (1987-06-01), Braaten
patent: 4872423 (1989-10-01), Pillai
patent: 5013355 (1991-05-01), Elvander et al.
patent: 5074909 (1991-12-01), Agar

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