氢氧化物表面沉淀在石英浮选中的作用

来源期刊：中南大学学报(自然科学版)1990年第3期

论文作者：王淀佐 胡岳华

文章页码：248 - 253

关键词：氢氧化物； 表面； 沉淀； 石英； 浮选

Key words：hydroxide； surface； precipitation； quartz； flotation

摘    要：采用ζ-电位测定、吸附量测定、浮选实验及溶液化学计算,研究了金属离子在石英表面的吸附行为及其对石英表面ζ-电位和浮选行为的影响。结果表明,表面金属氢氧化物沉淀是金属离子在石英表面吸附的活性组分。表面沉淀生成后,石英表面ζ-电位变正,变正的pH值CR2对应于表面沉淀生成的pH值(pH_s),随着pH值的增加,ζ-电位再次变负的pH值CR3对应于氢氧化物固体的PZC_e。用阴离子捕收剂浮选时,CR2≤pH≤CR3是金属离子起活化作用的有效pH范围。用阳离子捕收剂浮选时,则是起抑制作用的有效范围。

Abstract: In this paper,the adsorption of metallic ion at quartz and its effects on thesurface zeta potential and flotation behavior of quartz have been investigatedthrough flotation tests,measurement of zeta potential and adsorption and solutionchemistry calculation.It has been shown that surface hydroxide precipitation isthe active species of adsorption of metallic ion at quartz surface.The negativezeta potential of quartz surface is changed into positive with the formation ofsurface precipitation.The pH value（CR 2）of charge reversal is correspondent topH value（pH_s）of surface precipitation of metal hydroxide.The zeta potential isagain changed into negative with the going up of pH value which is usuallyattributed to the PZC of metal hydroxide.The pH region of pH_se orCR2<pH<CR3,is the effective range of metallic ion activating the anioniccollector flotation of quartz,which is also the range of metallic ion depressing thecationic collector flotation of quartz.