Flotation separation of feldspar from quartz using sodium fluosilicate as a selective depressant  

作　　者：Xin Hu Xian-Ping Luo Zi-Shuai Liu Yong-Bing Zhang He-Peng Zhou Zhi-Zhao Yang Xue-Kun Tang 

机构地区：[1]Faculty of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou,341000,China [2]Yichun Lithium New Energy Industry Research Institute,Jiangxi University of Science and Technology,Yichun,336000,China

出　　处：《Rare Metals》2024年第3期1288-1300,共13页稀有金属（英文版）

基　　金：financially supported by the Project of the National Natural Science Foundation of China(No.52274263);the Key R&D Plan Projects in Jiangxi Province(No.20214BBG74001)。

摘　　要：The physical and chemical properties of feldspar and quartz are highly similar,thus they cannot be easily separated effectively.In this work,the flotation separation of feldspar from quartz using sodium fluosilicate(Na_(2)SiF_(6);SF)as a selective depressant was investigated.Moreover,the influence mechanism of SF on the selective flotation separation of feldspar and quartz was investigated via flotation tests,chemical analysis of flotation solution,Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and contact angle analysis.The results of the flotation tests show that feld spar and quartz without SF treatment have good floatability.After SF treatment,feldspar still has good floatability,whereas quartz has significantly reduced floatability.Flotation solution chemical analysis shows that the functional group plays an important role in depressing the quartz is[SiF_(6)]^(2-).FTIR,XPS and contact angle analysis results show that[SiF_(6)]^(2-)is adsorbed only on the surface of quartz.Thus,a thin hydrophilic SiOF layer is generated on the surface,which interferes with the adsorption of the collector on the surface of the quartz.This phenomenon leads to a significant reduction in quartz's floatability.Therefore,SF has a good ability to separate feldspar from quartz by flotation.

关 键 词：Flotation separation Depressants Sodium fluorosilicate QUARTZ FELDSPAR 

分 类 号：TD97[矿业工程—选矿] TD923