The flotation separation of cassiterite and dravite was realized using lead complexes of benzohydroxamic acid(Pb-BHA)as a collector and sodium fluosilicate(SF)as a depressant.Zeta potential tests confirmed that SF ena...The flotation separation of cassiterite and dravite was realized using lead complexes of benzohydroxamic acid(Pb-BHA)as a collector and sodium fluosilicate(SF)as a depressant.Zeta potential tests confirmed that SF enabled the selective depression of dravite.The results of Fourier transform infrared(FTIR)spectroscopy analysis demonstrated that hydroxyl-containing groups in the hydrolysis products of SF selectively chemisorbed on the surface of dravite.X-ray photoelectron spectroscopy(XPS)analysis results further demonstrated the strong chemisorption of SF hydrolysis products(F-containing groups and hydroxyl-containing groups)on dravite(Mg sites).Consequently,the adsorption of Pb-BHA on dravite was selectively prevented.Based on the results,a selective depression model of SF on cassiterite and dravite was proposed.展开更多
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(N...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.展开更多
基金supported by the National Natural Science Foundation of China(No.52122406)the National Key Research Center and Development Program of the 14th Five-year Plan of China(Nos.2022YFC2905104,2022YFC2905105).
文摘The flotation separation of cassiterite and dravite was realized using lead complexes of benzohydroxamic acid(Pb-BHA)as a collector and sodium fluosilicate(SF)as a depressant.Zeta potential tests confirmed that SF enabled the selective depression of dravite.The results of Fourier transform infrared(FTIR)spectroscopy analysis demonstrated that hydroxyl-containing groups in the hydrolysis products of SF selectively chemisorbed on the surface of dravite.X-ray photoelectron spectroscopy(XPS)analysis results further demonstrated the strong chemisorption of SF hydrolysis products(F-containing groups and hydroxyl-containing groups)on dravite(Mg sites).Consequently,the adsorption of Pb-BHA on dravite was selectively prevented.Based on the results,a selective depression model of SF on cassiterite and dravite was proposed.
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)。
文摘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.
