抑制剂PBTCA对菱镁矿与白云石浮选分离的影响  

Effect of the Depressant PBTCA on Flotation Separation of Magnesite and Dolomite

作　　者：朱奥妮 唐远 李倩倩[1] 徐长明 李智力[1] 何东升[1] ZHU Aoni;TANG Yuan;LI Qianqian;XU Changming;LI Zhili;HE Dongsheng(School of Resources and Safety Engineering,Wuhan Institute of Technology,Wuhan 430073,China)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430073

出　　处：《金属矿山》2023年第8期131-136,共6页Metal Mine

基　　金：国家自然科学基金项目(编号:52104263);湖北省技术创新计划重点研发专项(编号:2023BCB079);武汉工程大学科学基金研究项目(编号:K2021099);武汉工程大学研究生创新基金项目(编号:CX2022587,CX2022592)。

摘　　要：菱镁矿与其主要伴生矿物白云石具有相似的晶体结构和表面性质,导致二者在常规浮选体系中难于有效分离。采用新型螯合抑制剂2-膦酸基-1,2,4-三羧酸丁烷(PBTCA)对菱镁矿和白云石进行单矿物和人工混合矿浮选研究,并通过动电位、接触角、红外光谱等检测手段对其选择性作用机理进行分析讨论。结果表明,油酸钠捕收剂体系PBTCA对白云石浮选具有较强的抑制作用,而对菱镁矿浮选的影响较小。在油酸钠用量80 mg/L、PBTCA用量40 mg/L、矿浆p H=9.3时,得到的混合矿浮选精矿MgO品位为46.95%、MgO回收率为82.21%,菱镁矿与白云石可实现有效分离。检测分析结果表明,PBTCA通过化学作用与油酸钠在白云石表面发生竞争吸附,显著降低了白云石表面的疏水性,对白云石表现出较强的抑制作用,从而实现菱镁矿与白云石的浮选分离。Magnesite has similar crystal structure and surface properties with its main accompanying mineral dolomite,making it difficult to separate them effectively in conventional flotation systems.In this study,the single mineral flotation and artificial mixed mineral flotation of magnesite and dolomite using a new chelating inhibitor,2-phosphonyl-1,2,4-tricarboxylic butane(PBTCA)were studied.The selective mechanism was analyzed through detection methods such as Zeta potential measurement,contact angle tests,and FTIR analysis.The results suggest that PBTCA has strong inhibition of dolomite flotation in sodium oleate(NaOl)collector system,while it has less effect on magnesite flotation.The grade and recovery of magnesium oxide obtained from artificial mixed mineral flotation concentrate was 46.95%and 82.21%respectively as the dosage of NaOl and PBTCA was 80 mg/L and 40 mg/L respectively and pH value of pulp was 9.3,which shows that the magnesite and dolomite were effectively separated.Results of detection analysis indicate that the chemical reaction contributes to the competitive adsorption between PBTCA and NaOl on the surface of dolomite,which significantly decreasing the surface hydrophobicity of dolomite and leading to favorable inhibitive effect on dolomite so that the flotation separation of magnesite and dolomite could be achieved.

关 键 词：螯合抑制剂 浮选分离 菱镁矿 白云石 选择性 

分 类 号：TD923[矿业工程—选矿]