首页|Flotation and adsorption of novel Gemini decyl-bishydroxamic acid on bastnaesite:Experiments and density functional theory calculations

Flotation and adsorption of novel Gemini decyl-bishydroxamic acid on bastnaesite:Experiments and density functional theory calculations

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Rare earth element is an important strategic metal,but the supply of high purity rare earth ores is grow-ing slowly,which is in sharp contradiction with the rapidly growing demand.Froth flotation has been confirmed to be an effective method to separate bastnaesite from its gangue minerls.However,the tra-ditional collectors are facing serious problems in flotation separation of minerals,requiring the addition of excess depressant and regulator in the flotation process.Herein,we proposed and synthesized novel Gemini hydroxamic acids Octyl-bishydroxamic acid(OTBHA),Decyl-bishydroxamic acid(DCBHA)and Dodecyl-bishydroxamic acid(DDBHA)as the collectors in bastnaesite-barite flotation system.The effect of different carbon chain lengths on the molecular properties were explored by density functional theory(DFT)calculations.DCBHA possessed a stronger reactivity compared with OCBHA and DDBHA.The flota-tion results verified the consistency of the computational calculation about the performance prediction of Gemini hydroxamic acids.Compared with OCBHA and DDBHA,DCBHA displayed superior collecting affinity toward bastnaesite,and did not float barite.Zeta potential results showed that the presence of DCBHA increased the potential of bastnaesite,while it had almost no effect on barite,indicating DCBHA had a stronger affinity for bastnaesite.Then,Fourier transform infrared(FTIR)and X-ray photo-electron spectroscopy(XPS)analyses indicated that the adsorption mechanism was due to two hydrox-amate groups of DCBHA co-anchored on bastnaesite surface by forming five-membered hydroxamic-(O-O)—Ce complexes.In addition,atomic force microscopy(AFM)clearly observed that DCBHA uni-formly aggregated on bastnaesite surface,which increased surface contact angle and improved the hydrophobicity of bastnaesite.

Gemini-hydroxamic acidBastnaesiteDFTFlotationAdsorption mechanism

Longhua Xu、Chang Liu、Jiushuai Deng、Donghui Wang、Kai Xue、Yan Wang、Jinping Meng、Jiongtian Liu

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School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China

Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China

School of Chemical & Environmental Engineering,China University of Mining & Technology-Beijing,Beijing 100083,China

State Key Laboratory of Mineral Processing,Beijing 100160,China

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National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaSichuan Science and Technology ProgramSichuan Science and Technology ProgramOpen Foundation of State Key Laboratory of Mineral Processing

2021YFC29008005192209151874247522042852023NSFSC19782022YFS0455BGRIMM-KJSKL-2023-05

2023

10.1016/j.ijmst.2023.08.006

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(10)
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