Abstract:

he gold ore contents particle size ore，most of them exists in the form of submicroscopic gold，arsenic and package pyrite，it is the high arsenic sulfide gold ore.When doing the flotation the gold concentrate containing arsenic，conventional cyanide leaching rate is only 11.84 percent.We carry out the expanding continuous test which is called flotation gold concentrate by bacterial oxidation-cyanide leaching gold，with grinding fineness of 0.071 mm（96 percent），pulp density of 20 percent，pulp temperature of 45 ℃，and pH value of 1.5~1.8，using secondary bacterial oxidation.When the oxidation lasts for 9 days，the gold leaching rate reaches 93.24 percent，which is more higher than cyanide leaching rate（81.40 percent）.In this case，index is increased significantly and  the sales problem is solved，and profit increases by more than fifty million per year.The research provides a new mineral smelting technology for the utilization of gold arsenic sulphide ore.

Key words: Arsenic-containing gold ore, Flotation gold concentrate, Bacterial oxidation-cyanide leaching method, Continuous expanded test