Monazite((Ce,La)PO4)is one of the major types of light rare earth minerals from which the light rare earth elements cerium(Ce)and lanthanum(La)are economically extracted.Flotation is extensively used to recover fine-grained monazite.Sodium oleate(NaOL)is considered as the collector with strong col-lecting ability for monazite flotation.However,this study shows that its collecting ability is still limited.In this paper,a phosphonic acid,nonane-1,1-bisphosphonic acid(C9-BPA),was employed as the novel collector in place of NaOL.Flotation experiments show that even when the C9-BPA dosage is less than one-fifth of the NaOL dosage,the monazite recovery using C9-BPA as the collector is approximately 22 wt％higher than that using NaOL.The mechanism by which C9-BPA adsorbs on monazite was investigated using zeta potential,infrared(IR)spectroscopy and X-ray photoelectron spectroscopy(XPS)measure-ments as well as first-principles calculations.Zeta potential measurements show a more significant decrease in the zeta potentials of monazite after the addition of C9-BPA compared to those after the addition of NaOL.For C9-BPA-treated monazite,the characteristic peaks of C9-BPA are observed in the IR and C 1s XPS spectrum,whereas for monazite treated by NaOL,no characteristic peak of NaOL was observed.Experimental results show that C9-BPA has a stronger affinity towards the monazite surface than NaOL as confirmed by the higher adsorption energy of CP-BPA on the monazite surface(-204.22 kJ/mol)than NaOL(-48.48 kJ/mol).This study demonstrates an extensive application value and prospect of C9-BPA in monazite flotation and helps design novel collectors with strong collecting ability for monazite flotation.

Zhao Cao;Xu Wu;Sultan Ahmed Khoso;Wenbo Zhang;Yuling Liu;Mengjie Tian;Jieliang Wang

Institute of Mining Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Central South University,Changsha 410083,China;Department of Mining Engineering,Mehran University of Engineering&Technology,Jamshoro 76062,Pakistan;Powder Metallurgy Research Institute,Central South University,Changsha 410083,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,China

稀土学报（英文版）

[1]Zhao Cao;Xu Wu;Sultan Ahmed Khoso;Wenbo Zhang;Yuling Liu;Mengjie Tian;Jieliang Wang-.Effect mechanism of nonane-1,1-bisphosphonic acid as an alternative collector in monazite flotation:Experimental and calculational studies)[J].稀土学报（英文版）,2022(05):822-830

bisphosphonic,calculational,lecting

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