油酸钠浮选菱锰矿的溶液化学机理研究  

Solution Chemistry Mechanism of Flotation of Sodium Oleate on Rhodochrosite

作　　者：覃文庆[1] 邹松[1] 刘三军[1] 罗虹霖 刘瑞增[1] 王兴杰[1] 

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083

出　　处：《武汉理工大学学报》2014年第7期124-129,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51274255)

摘　　要：通过单矿物浮选试验、油酸钠的溶液化学计算、菱锰矿的溶解度计算以及油酸根离子和Mn2+反应的标准吉布斯自由能计算,系统分析了水溶液中油酸钠对菱锰矿的浮选行为以及溶液化学作用机理。浮选结果显示,当油酸钠浓度为2×10-4 mol/L时,在较宽的pH范围之内菱锰矿的可浮性都很好;油酸钠的溶液化学计算表明了油酸根离子是油酸钠浮选菱锰矿的主要活性组分,矿物的溶解度计算说明了高碱条件下油酸钠和菱锰矿之间可能存在非静电力作用。最后通过热力学计算证明了溶液中的油酸根离子容易与Mn2+发生化学反应生成油酸锰沉淀。菱锰矿实际矿石浮选实验则表明,一粗二扫三精的开路流程可以得到含锰品位为16.10%、锰回收率(包括中矿)为81.01%的锰精矿。The flotation behaviors and solution chemistry mechnism of sodium oleate on rhodochrosite were studied systematically through single mineral flotation tests,solution chemistry calculations of sodium oleate,solubility calculation of rhodochrosite and calculations of Standard Gibbs free energy of the reaction between manganese ions and oleic acid ions in aqueous solution.The flotation results indicate that rhodochrosite has a good flotability at a wider pH range while the sodium oleate＇s concentration is 2×10-4 mol/L,and oeic acid ions is the main active ingredient on rhodochrosite flotation according to the solution chemistry analysis of sodium oleate.Mineral solubility calculations illustrate that there may be exist non-electrostatic forces between the sodium oleate and rhodochrosite under high alkaline conditions.In the end,oleic acid ions are readily to react with Mn2＋and generate precipitation of manganese oleate in aqueous solution via thermodynamic calculations.The flotation experiments of rhodochrosite ore show that manganese concentrate with Mn grade of 16.10%and Mn recovery（including middling）of 81.01%can be achieved by the opened-circuit process of one roughing-three cleanings-two scavenging.

关 键 词：油酸钠 浮选 菱锰矿 溶液化学 锰精矿 

分 类 号：TD913[矿业工程—选矿]