活性化されたセン亜鉛鉱の亜硫酸による抑制

堂屋敷選鉱場産亜鉛精鉱からの脱銅について

抄録

Milling at Doyashiki of Hanaoka mine is characterized by being rich in the secondary copper minerals, i. e. bornite, covellite, chalcocite and so on. These secondary copper minerals indicate same flotation characteristics as sphalerite, especially in the heaping-warm pulp flotation circuit which was developed in this mine.
Recently, the copper grade of zinc concentrate increased with the content of these secondary copper minerals and consequently it was forced to develop a new method to separate these copper minerals from zinc concentrate. But the adequate methods could not been found for depressing the activated sphalerite by using the conventional flotation methods.
Then the method of depressing the activated sphalerite has been developed and put into operation. This method involves grinding, heating or weathering of the pulp in the presence of sulphur dioxide.
From these results, it was found that the activated sphalerite could be depressed without using any other reagents such as sodium cyanide or sodium sulphide.