碳酸根对蛇纹石/黄铁矿浮选体系的分散作用机理  

Dispersion mechanism of carbonate on flotation system of serpentine and pyrite

作　　者：冯博[1,2] 卢毅屏[2] 翁存建 

机构地区：[1]江西理工大学江西省矿业工程重点实验室,江西赣州341000 [2]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2016年第4期1085-1091,共7页Journal of Central South University:Science and Technology

基　　金：中国博士后科学基金资助项目(2015M582759XB);国家自然科学基金资助项目(51564014)~~

摘　　要：通过浮选实验、沉降实验、红外光谱测试和溶液化学理论计算,考察碳酸根在蛇纹石/黄铁矿浮选体系中的分散作用,研究碳酸根的分散作用机理。研究结果表明:蛇纹石颗粒可通过异相凝聚作用吸附在黄铁矿表面,改变黄铁矿的表面性质,影响黄铁矿的浮选;碳酸钠、碳酸氢钠、碳酸铵这3种能够在溶液中水解生成碳酸根的调整剂能分散蛇纹石与黄铁矿混合矿,恢复被蛇纹石抑制的黄铁矿的可浮性。研究结果表明:在这3种碳酸盐能够分散蛇纹石与黄铁矿混合矿的pH区间,碳酸根主要以CO_3^(2-)形式存在,这3种碳酸盐在溶液中水解生成的CO_3^(2-)体积分数越高,对混合矿的分散作用效果越好;蛇纹石通过静电作用吸附在黄铁矿表面影响其浮选,碳酸盐调整剂水解生成的荷负电的CO_3^(2-)能够吸附在蛇纹石表面,改变蛇纹石表面电性,从而对蛇纹石与黄铁矿混合矿起到分散作用,减弱蛇纹石对黄铁矿的抑制作用。The dispersion effect of carbonate on flotation system of serpentine and pyrite and its mechanism were investigated through flotation experiments, sedimentation tests, FTIR and calculations of solution chemistry. The results show that the hetero-aggregation between serpentine and pyrite results in the attachment of serpentine slimes to pyrite surface and changes the surface characteristics of pyrite, thus the flotation recovery of pyrite decreases. Addition of various reagents which can produce carbonate is found to improve pyrite recovery during flotation. Carbonate mainly exists in the form of CO32- ions in p H range that carbonate can restore pyrite flotation recovery. When the reagent producing the carbonate ion is able to provide it at a higher concentration, the pyrite flotation performance is improved.CO32- adjusts the surface potential of serpentine through adsorption on serpentine surface and then disperses serpentine and pyrite.

关 键 词：蛇纹石 黄铁矿 异相凝聚 碳酸根 分散 

分 类 号：TD952[矿业工程—选矿]