矿产保护与利用2025，Vol.45Issue(3)：25-34,10.DOI:10.13779/j.cnki.issn1001-0076.2025.03.003
聚环氧琥珀酸在氟碳铈矿与萤石浮选分离中的选择性抑制作用机理研究
Selective Depression Effect and Mechanism of Polyepoxy Succinic Acid in the Flotation Separation of Bastnaesite and Fluorite
摘要
Abstract
The separation of bastnaesite from fluorite during the flotation process of rare earth minerals presents significant challenges due to the similarities in their surface chemical properties.This study investigates the effectiveness of polyepoxysuccinic acid(PESA,C4H4O5)n)as a selective depressant,and assesses its effect on the floatability of bastnaesite and fluorite through both single mineral and actual ore flotation experiments,specifically using magnetic separation of iron tailings from Baiyun Obo.The underlying mechanisms were investigated using Zeta potential measurements,Fourier-transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS).The results of flotation experiment indicate that,under single mineral flotation conditions with sodium oleate(NaOL)as the collector,recoveries of both bastnaesite and fluorite exceed 90%.When 40 mg/L of PESA is used as an inhibitor,the recovery of bastnaesite reaches 98.65%,while the recovery of fluorite drops to almost zero.In practical ore flotation scenarios,employing P8 as the collector,together with water glass and PESA as the inhibitors,and 2#oil as the frother,results in a rare earth concentrate with rare earth oxide(REO)and CaO contents of 57.27%and 4.50%,respectively,achieving a recovery rate of 52.10%.The introduction of PESA contributes to an increase of 1.92 percentage points in the REO content of the concentrate,and a reduction of 5.48 percentage points in CaO content compared to conditions without PESA.Mechanistic analyses indicate that the introduction of PESA results in a negative alteration of the Zeta potential of bastnaesite;however,no significant changes are observed in the infrared absorption peaks or the binding energy of the surface atoms.The adsorption occurring on the bastnaesite surface is predominantly characterized as physical adsorption,with limited evidence of chemical adsorption.Consequently,NaOL continues to adsorb on the bastnaesite surface,thereby maintaining its favorable floatability.In contrast,the Zeta potential,infrared absorption peaks,and binding energy of the surface atoms of fluorite show significant changes,suggesting a chemical bonding effect during the adsorption process on the fluorite surface.This effect inhibits the adsorption of NaOL on fluorite,resulting in a marked decrease in its floatability.This study provides new insights into the reagent scheme for effective separation of bastnaesite and fluorite.关键词
聚环氧琥珀酸/抑制剂/氟碳铈矿/萤石/浮选Key words
polyepoxysuccinic acid/depressant/bastnaesite/fluorite/flotation分类
矿业与冶金引用本文复制引用
郭春雷,刘廷,刘程宏,王维维,笪宗扬..聚环氧琥珀酸在氟碳铈矿与萤石浮选分离中的选择性抑制作用机理研究[J].矿产保护与利用,2025,45(3):25-34,10.基金项目
国家重点研发计划项目(2022YFC2905300) （2022YFC2905300）
内蒙古自治区自然科学基金项目(2023LHMS05050) （2023LHMS05050）
