关键词: 高压辊磨机 , 干式预选 磨矿 弱磁选

Abstract: The iron ore grade of Bingxin mining industry is 18.50%,and the magnetic iron grade is 15.69%.The iron mineral in the ore is mainly magnetite,which is distributed in different sizes.The magnetite aggregate often contains finegrained gangue minerals.In order to determine the highefficiency development and utilization process of the ore,the beneficiation experiment was carried out.The results show that the ore via closedcircuit broken process to -3 mm by high pressure roller mill and then dumped by powder dry concentrator (magnetic field strength 318.47 kA/m,rotational speed 80 r/min).The concentrate obtained is 66.62% TFe grade and 80.98% recovery when the grinding fineness is -0.074 mm accounted for 85%,via one roughing one cleaning low intensity magnetic separation (magnetic field strength 191.08 kA/m and 143.31 kA/m respectively).The process is simple and efficient,which is suitable for the development and utilization of the ore.

Key words: high pressure roller mill,dry preseparation,grinding,low intensity magnetic separation