Process of roasting refractory gold ores

Details Process of roasting refractory gold ores Process of roasting refractory gold ores

C - Chemistry, Metallurgy

22

B

C22B 11/02 (2006.01) B01J 8/18 (2006.01) C22B 1/10 (2006.01) F23C 10/10 (2006.01)

Patent

CA 2060878

Refractory gold ores are roasted by means of oxygen-containing gases in a circulating fluidized bed at temperatures of 500 to 750°C. The temperature in the lower portion of the fluidized bed contained in the reactor is adjusted to be 4 to 30°C higher than the temperature in the upper portion of the fluidized bed. The fluidizing gas is caused to floor into the reactor at a velocity of 30 to 200 m/sec.

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