十二烷基磷酸酯钾在菱锌矿表面的吸附机理

Adsorption mechanism of smithsonite by dodecyl phosphate ester potassium

通过单矿物浮选试验、动电位、红外光谱测试和X线光电子能谱分析(XPS)等研究十二烷基磷酸酯钾在菱锌矿表面的作用机理。研究结果表明:十二烷基磷酸酯钾对菱锌矿具有较强的捕收能力,尤其是弱碱性条件下,浮选回收率可达90%;与十二烷基磷酸酯钾作用后菱锌矿表面动电位显著负移,因此,可推断十二烷基磷酸酯钾能够在菱锌矿表面吸附;与十二烷基磷酸酯钾作用后菱锌矿表面出现药剂特征峰,且峰的位置偏移;十二烷基磷酸酯钾与菱锌矿作用后,矿物表面有新的Zn—O键形成,证明十二烷基磷酸酯钾与菱锌矿表面存在化学吸附。

The adsorption mechanism of smithsonite by dodecyl phosphate ester potassium was studied through single mineral flotation tests,Zeta potential measurements,infrared spectroscopic analysis and XPS tests.The results show that smithsonite has good floatability using dodecyl phosphate ester potassium as collector,especially in weak alkaline slurry while recovery reaches 90%.The Zeta potential of smithsonite makes significant negative shift after reacting with dodecyl phosphate ester potassium,which indicates that dodecyl phosphate ester potassium can be adsorbed on the surface of smithsonite.New potion characteristic peaks appear on the surface of smithsonite and the deviation of peaks is large.The new Zn-O bonds formed after reaction prove that chemical adsorption occurs on the surface of smithsonite.