閃亜鉛鉱の銅活性化阻止に対する硫化ソーダの影響

抄録

The effect of sodium sulphide on the prevention of copper activation for sphalerite was studied.
The adsorption of copper ion on sphalerite was measured in the solution containing copper ion and sodium sulphide with varying a pH value of solution. From the results, it is recognized that the adsorption of copper ion is prevented completely in an alkalin solution containing sodium sulphide. While, the adsorption of copper ion not prevented by raising the pH value of solution.
In the case where sodium cyanide is used-as a depressant, the effect of sodium sulphide on the prevention of copper activation was investigated. Until a certain amount of sodium cyanide, the floatability of sphalerite increases with the increase of sodium cyanide. It is confirmed that this phenomenon causes by the coating of copper sulphide particles precipitated by sodium sulphide on the sphalerite surface. However, increasing the concentration of sodium cyanide to over 30mg/l, depressing effect of sodium cyanide becomes distinguished by the addition of sndium sulphide.
In the case where sulphurous acid is used as a depressant, the floatability of sphalerite does not decrease at the low pH value and the colloidal sulphur is formed by the decomposition of sodium sulphide. However, with the increase of the pH value and the amounts of sulphurous acid, the depressing effect of sulphurous acid becomes vigorous in the presence of sodium sulphide.
Consequently, it may be considered that the copper activation for sphalerite is prevented perfectly by using sodium sulphide.