酯化淀粉对方解石的抑制机理  

Mechanism for Depressing Calcite with Esterified Starch

作　　者：魏邦其 李解[2] 曹钊 马赛赛 张雨涵 WEI Bangqi;LI Jie;CAO Zhao;MA Saisai;ZHANG Yuhan(School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014000,Inner Mongolia,China;School of Rare Earth Industry,Inner Mongolia University of Science and Technology,Baotou 014000,Inner Mongolia,China;School of Energy Science and Environment,Inner Mongolia University of Science and Technology,Baotou 014000,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学矿业与煤炭学院,内蒙古包头014000 [2]内蒙古科技大学稀土产业学院,内蒙古包头014000 [3]内蒙古科技大学能源科学与环境学院,内蒙古包头014000

出　　处：《矿冶工程》2025年第1期46-50,56,共6页Mining and Metallurgical Engineering

基　　金：内蒙古自治区科技计划项目(2021GG0438);北方稀土项目(白云鄂博矿高丰度混合稀土软磁材料关键技术研发)。

摘　　要：通过浮选试验、溶液表面张力测试、Zeta电位测试以及红外光谱分析等方法,研究了酯化淀粉对方解石的抑制机理。结果表明:酯化淀粉对方解石的抑制效果明显强于普通淀粉;酯化淀粉的双极性基团化学吸附在方解石矿物表面,使方解石表面接触角减小,亲水性增加;酯化淀粉使方解石表面Zeta电位负向移动,方解石颗粒之间分散性增加,有效减少浮选产物含水夹带;在油酸钠体系中,酯化淀粉分子空间位阻比油酸钠分子大,与油酸钠分子发生竞争吸附的同时能阻碍油酸钠分子在矿物表面的吸附。The mechanism for calcite depression with esterified starch was investigated by performing flotation test,surface tension test,zeta potential measurement and infrared spectroscopy analysis.The results show that,compared with ordinary starches,the esterified starch serves as a significantly stronger depressant for calcite.The esterified starch with bipolar functional groups can be chemisorbed onto calcite,reducing the contact angle of calcite surface and increasing its hydrophilicity.It also causes a negative shift of zeta potential of calcite,therewith,enhancing dispersion of calcite particles and effectively reducing hydrous entrainments in flotation products.In the flotation system using sodium oleate as the collector,esterified starch,possessing greater steric hindrance than sodium oleate,can prevail in their competitive adsorption and hinder the adsorption of sodium oleate.

关 键 词：酯化淀粉 方解石 浮选 油酸钠 抑制剂 化学吸附 接触角 

分 类 号：TD923[矿业工程—选矿]