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

Longhua Xu ¹Chang Liu ²Jiushuai Deng ³Donghui Wang ⁴Kai Xue ⁵Yan Wang ⁵Jinping Meng ⁵Jiongtian Liu⁶

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作者信息

1. 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
2. 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
3. School of Chemical & Environmental Engineering,China University of Mining & Technology-Beijing,Beijing 100083,China
4. Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China;State Key Laboratory of Mineral Processing,Beijing 100160,China
5. Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China
6. School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China
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Abstract

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.

Key words

Gemini-hydroxamic acid/Bastnaesite/DFT/Flotation/Adsorption mechanism

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基金项目

National Key R&D Program of China(2021YFC2900800)

National Natural Science Foundation of China(51922091)

National Natural Science Foundation of China(51874247)

National Natural Science Foundation of China(52204285)

Sichuan Science and Technology Program(2023NSFSC1978)

Sichuan Science and Technology Program(2022YFS0455)

Open Foundation of State Key Laboratory of Mineral Processing(BGRIMM-KJSKL-2023-05)

出版年

2023

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

参考文献量4

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