钛铁矿摩擦静电分选研究

为探究摩擦电选分选钛铁矿的可行性，对比了钛铁矿及长石、石英、云母等脉石矿物与不同材质进行摩擦后的荷电特性。结果表明，以PVC作为摩擦介质时，钛铁矿与脉石矿物荷电的极性相反，且钛铁矿荷电量最高，荷质比可达4 nC/g。在此基础上对不同粒级矿物颗粒进行了荷电效果比较，确定物料的最佳分选粒级为0.074~0.125 mm。采用实验室锯齿形摩擦电选系统对粒度为0.074~0.125 mm的钛铁矿与长石、石英、云母脉石矿物组成的混合物料进行摩擦电选试验，考察分选电压、给料速度和风量对分选结果的影响。结果表明，物料的分选效率随着分选电压、给料速度和风量的增大均呈先增大后减小的趋势，在分选电压为20 kV、给料速度为4.7 g/s、风量为80 m3/h时，钛铁矿分选指标最佳。

Study of Triboelectrostatic Separation on Ilmenite Ore

In order to investigate the feasibility of ilmenite separation by triboelectrostatic,the triboelectrostatic charging characteristics of ilmenite and its main individual gangue minerals with different friction media have been compared.Results show that PVC is the most suitable friction material as it results in the best charge differences between ilmenite and gangue minerals and ilmenite reaches the highest specific charge density of 4 nC/g.The optimum particle size fraction is determined to be 0.074~0.125 mm based on comparison among different particle sizes of specific charge density.Separation experiments with different mixtures of ilmenite,feldspar,quartz and mica with particle sizes of 0.074~0.125 mm were carried out by a laboratory sawtooth type of triboelectrostatic separation system to study influence of separation voltage,feed rate,and airflow velocity on the separation efficiency.The results show that the separation efficiencies increased initially and then decreased with the increase of separation voltage,feed rate and air flow rate.The optimum ilmenite separation efficiency could be reached at 20 kV separation voltage,4.7 g/s feed rate and 80 m3/h air flow rate.