ザンセートを利用したCd<SUP>2+</SUP>の浮選におよぼす浮選機インペラ周速度と空気吹込量ならびにpHの影響

Abstract

It is possible to remove selectively a small amount of cadmium ion from the solution containing considerable amounts of ferrous and zinc ions by flotation technique using xanthate as a collector.Toimprove the removal of cadmium ion, the effects of agitation and aeration in a flotation cell havebeen studied using artificial waste water. Also, the effects of pH have been examined. The flotationtests were conducted using potassium n-amyl xanthate as a collector and Denver-type flotator with 400ml capacity cell.The main results obtained are as follows;(1) Optimum pH range is from 4 to 8 for the removal of cadmium ion. However, when the solution contains ferrous or ferrici on, the removal decreases remarkably at pH above 6 to 7. The decrease of the removal is considered to be dueto theco-precipitation of cadmium with iron hydroxide.(2) Maximum removal of cadmium ion is obtained with the addition of xanthate of 2 equivalent to cadmium ion involved in the solution. And further addition leads to a decrease of the removal.(3) The removal of cadmium ion increases with the extents of agitation and of aeration in a flotation cell. It is considered that cadmium xanthateparticles become floatable by forming a hydrophobic froc including air bubbles. The agitation is considered to promote the flocculation of cadmium xanthate particles by increasing the probability of collisionbetween cadmium xanthate particles and air bubbles.