Synthesis of glycerine-xanthate and its depressing mechanism in separation of marmatite from arsenopyrite
来源期刊：中南大学学报(英文版)2006年第6期
论文作者：熊道陵 胡岳华 覃文庆 何名飞
文章页码：678 - 682
Key words：organic depressant;synthesis; glycerine-xanthate; marmatite; arsenopyrite;flotation
Abstract: A small molecular organic depressor glycerine-xanthate was synthesized.The effect of glycerine-xanthate on the flotation of sulfide minerals was investigated based on a function of pH value and concentration of glycerine-xanthate through flotation experiments in the presence and absence of Cu2+ .The results show that glycerinee-xanthate has a strong dressing effect on marmatite at pH>6 and on arsenopyrite in weak acid and base conditions with butyl-xanthate as collector.In the presence of glycerine-xanthate,marmatite is activated by addition of Cu2+,but arsenopyrite cannot be activated and remains unfloatable.So the selective separation can be achieved for two minerals.The depression of glycerine-xanthate on sulfide minerals was discussed based on the radicalelectronegative calculation and the theory of HSAB.Infrared spectrum shows that there are some—OH and—CSS—in glycerine-xanthate molecule,which competes with butyl-xanthate on the mineral surface.As a result of many hydrophilic groups in glycerine-xanthate,the surfaces of marmatite and arsenopyrite become hydrophilic,thus the flotation of marmatite and arsenopyrite is depressed.The collector is adsorbed preferentially on the surface of marmatite and it shows a better floatability in the presence of Cu2+ ,whereas,the surface of arsenopyrite absorbs glycerine-xanthate and the flotation of arsenopyrite is depressed by glycerine-xanthate.
