微细粒辉钼矿的浮选动力学研究  

Flotation kinetics of molybdenite fines

作　　者：林清泉[1,2] 顾帼华 陈雄[1] 邓莎[1] 许宝科[1] 李丽娟 LIN Qingquan;GU Guohua;CHEN Xiong;DENG Sha;XU Baoke;LI Lijuan(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Jiangxi Copper Corporation Co.Ltd.,Nanchang 330096,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]江西铜业集团有限公司,江西南昌330096

出　　处：《中南大学学报（自然科学版）》2018年第7期1573-1581,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51374249);中南大学中央高校基本科研业务费专项资金资助项目(2016zzts103);国家科技支撑计划项目(2015BAB12B02)~~

摘　　要：采用一级动力学模型研究粒度低于38μm的微细粒辉钼矿在不添加或者添加柴油时的浮选动力学。研究结果表明:不添加柴油时微细粒辉钼矿的浮选速率常数小,浮选回收率低;而在添加柴油的体系中,柴油用量的增加可以增大疏水团聚体的粒径,提高浮选速率常数,从而增大微细粒辉钼矿的浮选效率;矿浆pH对微细粒辉钼矿浮选速率的影响较大,在酸性和中性pH条件下,辉钼矿的浮选速率常数明显大于碱性条件下的速率常数;在柴油体系中,降低pH会促进辉钼矿颗粒的聚集行为,但聚集程度增加不大,从而引起辉钼矿浮选回收率增加不明显;适当增大搅拌转速也可以促进微细粒辉钼矿的聚团行为,增大团聚体的平均粒径,提高其浮选速率常数和浮选回收率;微细粒辉钼矿与柴油油滴之间相互作用力以疏水引力为主。The flotation kinetics of molybdenite fines(lower than 38μm)with and without the presence of diesel oil was investigated by first-order kinetic equation.The results show that in the absence of diesel oil,the flotation rate constant and flotation recovery of fine molybdenite are low,while the addition of diesel oil can significantly improve the flotation efficiency of molybdenite by increasing the size of hydrophobic agglomerates and enhancing the flotation rate constant.The pulp pH also affects the flotation rate of fine molybdenite.Under the condition of acidic and neutral pH,flotation rate constant of molybdenite is significantly greater than that of alkaline condition.In the presence of diesel oil,lower pH can accelerate the aggregation behavior of molybdenite particles,while modest increase of aggregation degree can slightly increase the flotation recovery of molybdenite fines.A suitable increase in stirring speed is conducive to hydrophobic agglomeration of molybdenite,which increases the agglomerates size,flotation rate constant and flotation recovery.Moreover,the hydrophobic attractive force between diesel oil drop and molybdenite is the main driving force resulting in the collection effect.

关 键 词：微细粒 辉钼矿 浮选动力学 浮选速率常数 疏水聚团 

分 类 号：TD952[矿业工程—选矿]