Enhancement of 2-hydroxy-3-naphthyl hydroxamic acid adsorption on bastnaesite and monazite surfaces using H_(2)O_(2)pre-oxidation for improved flotation process  

作　　者：Weiwei Wang Zhengyao Li Anhua Zou Kai Gao Weiyao Zhu Shaochun Hou Chunlei Guo Yuanyuan Wang 

机构地区：[1]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Baiyun Obo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China [3]State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education,University of Science and Technology Beijing,Beijing 100083,China [4]Baotou Rare Earth R&D Center,Baotou 014030,China

出　　处：《International Journal of Mining Science and Technology》2024年第11期1613-1623,共11页矿业科学技术学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52174236);Fundamental Research Funds for the Central Universities(No.FRF-DF-23-001);the Natural Science Foundation of Inner Mongolia of China(Nos.2024MS05061 and 2023LHMS05050)。

摘　　要：Rare earth elements have been widely applied in various sectors.Bastnaesite and monazite are crucial rare earth minerals,and flotation is a vital technique for recovering fine-grained rare earth minerals and separating them from associated gangue minerals such as fluorite and apatite.Flotation collectors play a key role in selectively adsorbing valuable minerals,enhancing their surface hydrophobicity,which has prompted considerable research interest.However,the interaction between minerals and reagents relies on the reactivity and selectivity of the reagent groups,as well as the reactive properties of the surface atoms of the minerals.This study proposes the use of H_(2)O_(2)oxidation to enhance the flotation process of rare earth minerals.The flotation experiments demonstrated that pre-adding H_(2)O_(2)before introducing the flotation collector significantly improved the grade and recovery of rare earth concentrates.The adsorption mechanisms of 2-hydroxy-3-naphthyl hydroxamic acid collector on rare earth mineral surfaces before and after H_(2)O_(2)pre-oxidation were studied.The 2-hydroxy-3-naphthyl hydroxamic acid interacts with Ce^(3+)on the surface of unoxidized rare earth minerals,forming chelate compounds with five-membered ring structures.The H_(2)O_(2)exhibited potent oxidizing properties and oxidized the Ce^(3+)on the bastnaesite and monazite surfaces to more stable Ce^(4+),which demonstrated stronger binding capability with hydroxamic acid.

关 键 词：BASTNAESITE MONAZITE Flotation H_(2)O_(2) Surface pre-oxidation 

分 类 号：TD955[矿业工程—选矿] TD923