基于高压电脉冲的磁铁石英岩预处理

采用一种新型实验室高压电脉冲矿石预处理技术及“预处理—破碎—磨矿—弱磁选”流程，考察了高压电脉冲预处理技术对大孤山磁铁石英岩的粉碎产品及磁选精矿品位的影响.试验结果表明，在磨矿浓度为70%，磨矿时间为3min，磁场强度为111.4kA/m，磁选时间为3min的条件下，预处理磁选精矿品位提高7.26%.单体解离度分析表明，预处理产品的粒级分布更均匀，有用矿物的单体解离度提高17.78%(-0.50mm粒级).采用SEM观察其微观结构，预处理破碎产品内部的裂纹主要在相邻的不同矿物界面之间产生并发展.高压电脉冲预处理技术通过促进矿石内部不同矿物晶界处微裂纹的产生和发展，减少磨矿时间，从而降低能耗.

Magnetite Quartz Pre-treatment Using High Voltage Pulse

A new type of laboratory high-voltage pulse(HVP) pretreatment technology and a pretreatment-crushing-grinding-weak magnetic separation process were used to investigate the effect of HVP pretreatment technology on the pulverized products of Dagushan magnetite quartzite and on the grade of magnetic separation concentrate.The test results showed that the grade of pretreatment concentrate increases by 7.26%when the grinding concentration，the grinding time， the magnetic field strength and the magnetic separation time are 70%， 3min， 111.4 kA/m and 3min respectively. The analysis of liberation degree showed that the particle size distribution of the pretreated products is more uniform， and the liberation degree of the useful mineral is increased by 17.78%(-0.50mm grain size). The microstructure observed by SEM showed that the cracks inside the pretreated crushed product mainly generate and develop between the adjacent mineral interfaces. The HVP pretreatment technology can reduce the grinding time thus decreasing the energy consumption by promoting the generation and development of microcracks along different mineral grain boundaries within the ore.