PROCESS OF ROASTING REFRACTORY GOLD ORES

摘要

Refractory gold ores are roasted by means of oxygen-containing gases in a circulating fluidized bed at temperatures of 500 to 750.degree.C. The temperature in the lower portion of the fluidized bed contained in the reactor is adjusted to be 4 to 30.degree.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.