Patent ID: 7498006

Claim:
A method of extracting gold from arsenic gold ore concentrate comprising: (1) loading a material comprising arsenic gold ore concentrate and iron powder into a smelting chamber; (2) increasing the temperature of the smelting chamber to 100° C.-300° C. and holding that temperature to remove vapor and a small quantity of dust from the material; (3) increasing, under residual pressure ≦50 Pa, the temperature of the smelting chamber and the temperature of a crystallization chamber to 300-500° C. and holding the increased temperatures to remove volatilized arsenic sulfides from the material; (4) holding the temperature of the crystallization chamber at 300-500° C., and increasing the temperature of the smelting chamber to 500-600° C. and holding that temperature to remove decomposed gaseous element sulfur from the material; (5) increasing the temperature of the smelting chamber to 600-760° C. and holding that temperature, while lowering the temperature of the crystallization chamber to 270-370° C. and holding that temperature to allow arsenic vapor generated from the material to crystallize in the crystallization chamber and obtain arsenic and gold-rich slag after dearsenization at the bottom of the smelting chamber; (6) lowering the temperatures of the smelting chamber and the crystallization chamber to below 150° C., charging air into an air charging valve, and, when inside and outside air pressures are approximately equal, stripping the arsenic, and taking out the gold-rich slag after dearsenization; and (7) extracting fine gold from the gold-rich slag.