白象山选矿厂中碎系统干抛工艺优化研究  

Study on Optimization of Dry Throwing Process of Intermediate Crushing System in Baixiangshan Concentrator

作　　者：陈辛 王荣林 杨松付 梁朝杰 王欢 冯建 郑思冉 李明军 CHEN Xin;WANG Ronglin;YANG Songfu;LIANG Chaojie;WANG Huan;FENG Jian;ZHENG Siran;LI Mingjun(Gushan Mining Co.,Ltd.,Anhui Masteel Mining Resources Group)

机构地区：[1]安徽马钢矿业资源集团姑山矿业有限公司

出　　处：《现代矿业》2023年第12期246-249,共4页Modern Mining

摘　　要：白象山选矿厂中碎产品(35~0 mm)中可供回收的有价成分为铁,磁性铁分布率达80.73%,磁滑轮干抛废石全铁及磁性铁品位均较高,干抛效果较差,资源浪费严重。为解决该问题,进行了实验室抛废工艺优化研究。结果表明,现场中碎产品全粒级干式预选(磁场强度318.47kA/m、带速为0.83 m/s)抛废产率为8.49%、废石磁性铁品位为2.56%,显著优于现场生产指标,但仍意味着进入高压辊磨机的新给料量非常大;现场中碎产品采用先筛分分级(筛孔宽5 mm)再粗细分别抛废、块精矿进入高压辊磨机辊压、辊压产品返回筛分的闭路流程处理,可抛出产率9.92%、全铁品位8.70%、全铁损失率2.69%的块废石(35~5mm),产率27.00%、全铁品位11.50%、全铁损失率9.69%的粉尾矿(5~0 mm),获得产率63.08%、全铁品位44.50%、全铁回收率87.62%的粉精矿(5~0 mm),达到了较好的能抛早抛、节能降耗效果。The valuable component that can be recovered in the intermediate crushing products(35~0 mm)of Baixiangshan concentrator is iron,and the distribution rate of magnetic iron is 80.73%.The total iron and magnetic iron grade of the magnetic pulley dry discarding waste rock are high,the dry discarding effect is poor,and the waste of resources is serious.In order to solve this problem,the optimization of laboratory waste disposal process was studied.The results show that the discarding waste rate of full-size dry pre-concentration(magnetic field intensity 318.47 kA/m,belt speed 0.83 m/s)of the intermediate crushing product in the field is 8.49%,and the magnetic iron grade of waste rock is 2.56%,which is significantly better than the on-site production index,but it still means that the new feed into the high-pressure roller mill is very large.The on-site intermediate crushing products are treated by a closed-circuit process of first screening and grading(sieve hole width 5 mm)and then discarding the coarse and fine respectively,the lump concentrate is rolled into the high-pressure roller mill,and the rolled products are returned to the screening.The waste rock(35~5 mm)with yield of 9.92%,total iron grade of 8.70%and total iron loss rate of 2.69%can be thrown out,and the powder tailings(5~0 mm)with yield of 27.00%,total iron grade of 11.50%and total iron loss rate of 9.69%can be obtained.The powder concentrate(5~0 mm)with yield of 63.08%,total iron grade of 44.50%and total iron recovery rate of 87.62%can be obtained,which can achieve better effects of early throwing and energy saving and consumption reduction.

关 键 词：中碎产品 预选抛废 分级预选 节能降耗 

分 类 号：TD951[矿业工程—选矿]