金属离子对白钨矿、方解石、萤石浮选的影响及作用机理研究

发布时间：2018-05-18 19:07

本文选题：白钨矿 + 浮选　；参考：《江西理工大学》2015年硕士论文

【摘要】：白钨矿与含钙脉石矿物方解石、萤石的浮选分离是当今选矿界面临的重要难题之一,选择合适的捕收剂和抑制剂是获得良好分离指标的关键,然而白钨矿浮选体系中存在的金属离子会干扰捕收剂和抑制剂的作用效果,影响白钨矿与含钙脉石的浮选分离。本文以白钨矿、方解石和萤石为研究对象,选取苯甲羟肟酸为捕收剂,研究Pb2+、Fe3+、Cu2+、Ca2+、Mg2+等金属离子对矿物浮选的影响,并分析其作用机理,为含钙矿物之间的浮选分离提供指导。论文的主要研究内容和创新成果如下:在碱性条件下,Fe3+、Cu2+对白钨矿浮选表现出明显的抑制作用,对方解石和萤石的浮选抑制作用较弱;Ca2+、Mg2+对三种含钙矿物的浮选几乎不产生影响;Pb2+是唯一对三种含钙矿物都有活化性能的金属离子,适量Pb2+能最大程度活化含钙矿物的浮选,其活化组分与矿浆p H密切相关,在较低p H时,以Pb OH+为主,较高p H时以界面区域生成的Pb(OH)2(s)为主。适量的Pb2+能提高捕收剂与矿物表面反应质点的活性,提高矿物表面的接触角,促进苯甲羟肟酸在矿物表面的吸附;Pb2+能提高白钨矿物表面Zeta-电位,当浓度足够高时,白钨矿表面Zeta-电位会出现两次电性变号。在Pb2+存在下,经适量抑制剂水玻璃作用后,方解石和萤石得到充分抑制,而白钨矿仍保持良好的可浮性,可实现白钨矿与方解石和萤石的有效分离。
[Abstract]:The flotation separation of scheelite from calcium gangue calcite and fluorite is one of the most important problems in the field of mineral processing nowadays. The key to obtain a good separation index is to select appropriate collector and depressant. However, the existence of metal ions in the flotation system of scheelite will interfere with the effect of collector and depressant, and affect the flotation separation of scheelite and calcium containing gangue. In this paper, taking scheelite, calcite and fluorite as research objects, using benzohydroxamic acid as collector, the effect of metal ions, such as Pb2 Fe 3, Cu 2 and Ca 2 + mg 2, on mineral flotation is studied, and the mechanism of action is analyzed. It provides guidance for flotation separation of calcium-bearing minerals. The main research contents and innovative results of this paper are as follows: Fe3Cu2 can inhibit the flotation of scheelite obviously under alkaline condition. The inhibition of calcite and fluorite flotation is weaker than that of Ca 2 + mg 2, which has little effect on the flotation of three calcium bearing minerals. Pb2 is the only metal ion that can activate all the three calcium bearing minerals. Proper amount of Pb2 can activate the flotation of calcium bearing minerals to the maximum extent. The activated components are closely related to the pH of pulp. At lower pH, Pb OH is the main component, and at higher pH, PBO OH 2 / s is the main component. Proper amount of Pb2 can increase the activity of particle reaction between collector and mineral surface, increase the contact angle of mineral surface, promote the adsorption of benzohydroxamic acid on mineral surface and increase the Zeta- potential on the surface of scheelite, when the concentration is high enough, Zeta- potential on the surface of scheelite has two electrical variations. In the presence of Pb2, calcite and fluorite can be fully inhibited by the action of suitable amount of sodium silicate, while scheelite can be effectively separated from calcite and fluorite by keeping good floatability.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD923

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