| 摘要 |
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 DEG C. (e.g. 650-750 DEG C.). Roasted material is discharged from the furnace and acted upon to recover gold, silver and copper metal. |
