钽铌粗精矿高梯度磁选数值法分析

Numerical Analysis of High Gradient Magnetic Separation on the Rough Concentrate of Tantalum-niobium

以某富铪锆矿粗精矿为研究对象,在进行高梯度磁选钽铌试验的同时,采用数值解析方法分析高梯度设备内的磁场特性,将磁场划分为六边形单元并用"瞬时快照法"对磁选过程进行分析,用两组偏心椭圆来近似表示不同矿粒在磁场中的捕集区域,通过求解偏心椭圆在x轴上的临界值来确定钽铌精矿的产率、回收率及品位。数值法计算结果和高梯度磁选试验结果的对比分析表明:数值计算结果揭示了高梯度磁选的捕集规律,能够实现高梯度磁选试验的条件参数对分选效率影响的预评估,在缩小试验范围、降低试验次数的同时能够实现分选效率的提高。该研究方法及结果对钽铌矿及其它弱磁性矿物的高梯度磁选实践具有一定的指导意义和参考价值。

This paper studied the separation of Tantalum&Niobium from the rough concentrate of a rich hafnium zirconium ore by HGMS(High Gradient Magnetic Separation).The magnetic field of HGMS was divided into hexagonal cells and the saparatoion was analyzed by“instantaneous snapshot”method.Two groups of eccentric ellipse are used to approximate the trapping regions of different particles in each unit,and the yield,recovery and grade of Tantalum-Niobium concentrate are determined by solving the critical value of eccentric ellipse on the x-axis.The comparison between numerical results and practical experiments indicated that:the numerical method basically reveals the capture law of high gradient magnetic separation.It may improve the separation efficiency although the range and time of real experiments are decreased,which may play a guiding role on the high gradient magnetic separation of tantalum-niobium ore and other weakly magnetic minerals.