无机磷酸盐抑制剂在含钙矿物浮选分离中的新见解  

New insights of inorganic phosphate inhibitors for flotation separation of calcium-bearing minerals

作　　者：关智文 焦芬 王旭 覃文庆 符力文 张政权 李卫 GUAN Zhi-wen;JIAO Fen;WANG Xu;QIN Wen-qing;FU Li-wen;ZHANG Zheng-quan;LI Wei(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)

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China [2]Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Central South University,Changsha 410083,China

出　　处：《Journal of Central South University》2024年第3期796-812,共17页中南大学学报（英文版）

基　　金：Projects(51974364,52074355,52304316)supported by the National Natural Science Foundation of China。

摘　　要：本文通过计算预测了焦磷酸四钠(TSPP)、三聚磷酸钠(STPP)和六偏磷酸钠(SHMP)对白钨矿、萤石和方解石的抑制能力,并通过微浮选试验进行了验证。亲水-亲脂性平衡(HLB)计算、基团电负性计算和微浮选试验结果表明,磷酸盐对三种矿物的抑制能力随着磷酸基团数量的增加而增强,三种无机磷酸盐的抑制能力顺序为SHMP>STPP>TSPP。STPP在萤石和方解石中浮选分离白钨矿具有很大的潜力。STPP对三种含钙矿物的抑制能力依次为方解石>萤石>白钨矿。接触角测量、吸附量测量、X射线光电子能谱(XPS)分析和原子力显微镜(AFM)成像结果表明,STPP在萤石和方解石表面的吸附量远大于在白钨矿表面的吸附。白钨矿对STPP的弱吸附几乎不影响油酸钠(NaOL)的捕收。STPP可与萤石和方解石表面的Ca^(2+)络合,阻碍后续NaOL的吸附。本研究结果对白钨矿的浮选和含钙脉石矿物抑制剂的筛选具有指导意义。In this paper,the inhibition ability of tetrasodium pyrophosphate(TSPP),sodium tripolyphosphate(STPP)and sodium hexametaphosphate(SHMP)to scheelite,fluorite and calcite was predicted by performance calculation and further verified by micro-flotation test.The results of hydrophile lipophilic balance(HLB)calculation,group electronegative calculation and micro-flotation test indicated that the inhibition ability of phosphate to the three minerals increases with the increase of the number of phosphate groups and the order of inhibition ability of the three inorganic phosphates was SHMP>STPP>TSPP.STPP had great potential for flotation separation of scheelite from fluorite and calcite.The order of inhibition ability of STPP against the three calcium-bearing minerals is calcite>fluorite>scheelite.The results of contact angle measurement,adsorption amount measurement,X-ray photoelectron spectroscopy(XPS)analysis and atomic force microscope(AFM)imaging presented that the adsorption of STPP on the fluorite and calcite surface was much larger than that on the scheelite surface.The weak adsorption of STPP on the scheelite hardly influenced the collection of sodium oleate(NaOL).STPP could complex with Ca^(2+)on the surface of fluorite and calcite,and hinder the subsequent adsorption of NaOL.The results can provide guiding significance for the flotation of scheelite and the screening of inhibitors for calcium-bearing gangue minerals.

关 键 词：白钨矿 萤石 方解石 无机磷酸盐 浮选分离 

分 类 号：TD923.14[矿业工程—选矿]