氰化过程中脉石矿物表面金离子吸附规律及动力学研究  

Adsorption of gold ions on gangue mineral surface during cyanidation and its kinetics

作　　者：赵前飞[1,2] 杨洪英 佟琳琳[1,2] ZHAO Qianfei;YANG Hongying;TONG Linlin(Key Laboratory for Ecological Metallurgy of Multimetallic Minerals(Ministry of Education),Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学多金属矿生态冶金重点实验室(教育部),辽宁沈阳110819 [2]东北大学冶金学院,辽宁沈阳110819

出　　处：《中国有色冶金》2023年第3期93-101,共9页China Nonferrous Metallurgy

基　　金：国家重点研发计划项目(2018YFC1902002,2018YFC1902001)。

摘　　要：长石、石英和方解石为金精矿中具有代表性的脉石矿物,在氰化浸出过程中金会部分吸附到脉石矿物表面,从而造成金流失。本文研究了氰化条件下金在脉石表面的吸附及其吸附机理。结果表明,当脉石投加量为15 g、接触时间为20 min时,金的吸附率达到最高,此时长石、石英和方解石对金的吸附率分别为14.80%、3.70%和2.48%。采用准一级动力学、准二级动力学、双常数模型和Elovich模型对试验结果进行了拟合,发现金在三种脉石表面的吸附均符合准二级动力学模型和双常数模型(R^(2)>0.96),表明吸附过程以化学吸附为主,且较易发生。通过X射线光电子能谱仪(XPS)分析表明,脉石表面的≡Si—O-为主要的金吸附位点。Feldspar,quartz,and calcite are representative gangue minerals in gold concentrates.During cyanide leaching,gold will partially adsorb onto the surface of the gangue minerals,resulting in gold loss.In this paper,the adsorption of gold on the surface of gangue under cyanidation conditions and its adsorption mechanism were studied.The results showed that the highest gold adsorption rate was achieved when the gangue dosage was added at 15 g and the contact time was 20 min,and the gold adsorption rates of feldspar,quartz and calcite were 14.80%,3.70%and 2.48%,respectively.The experimental results were fitted using quasi⁃first order dynamics,quasi⁃second order dynamics,double constant model and Elovich model.The results showed that the adsorption of gold on the surfaces of the three gangue minerals all fitted the quasi⁃secondary kinetic model and the double constant model(R^(2)>0.96),indicating that the adsorption process was dominated by chemisorption and was more likely to occur.X⁃ray photoelectron spectroscopy(XPS)analysis showed that≡Si—O^(-)on the surface of the gangue was the main gold adsorption site.

关 键 词：石英 长石 方解石 吸附行为 动力学模型 金精矿 氰化浸出 金 

分 类 号：TF831[冶金工程—有色金属冶金]