梅山铁矿20~2 mm磨前预选工艺现状分析及优化研究  

Analysis and Optimization of 20~2 mm Preconcentration Process before Grinding in Meishan Iron Mine

作　　者：张祖刚 成磊 周润 王秋林[3] ZHANG Zugang;CHENG Lei;ZHOU Run;WANG Qiulin(Mining Branch of Nanjing Baodi Meishan Industrial City Development Co.,Ltd.;Mining and Metal-lurgy Technology Group Co.,Ltd.;Changsha Institute of Mining and Metallurgy Co.,Ltd.)

机构地区：[1]南京宝地梅山产城发展有限公司矿业分公司 [2]矿冶科技集团有限公司 [3]长沙矿冶研究院有限责任公司

出　　处：《现代矿业》2022年第7期185-188,共4页Modern Mining

摘　　要：为提高梅山铁矿磨前20~2 mm粒级预选精度,针对现有预选流程存在的精矿中脉石夹杂、尾矿金属损失大等问题,对该粒级原矿开展了选别试验研究。试验结果表明,磨前预选20~2 mm粒级磁滑轮精矿经过精选,可得到铁品位48.96%、铁回收率83.97%的精矿,铁品位提高了5.86个百分点;采用新型高磁场力2RTGX0612筒式永磁强磁选机的精矿铁品位平均达36.79%,尾矿铁品位平均11.01%;相比现有辊式强磁选机精矿铁品位提升了2.59个百分点,尾矿铁品位降低了2.19个百分点,分选效率明显提升;在金属回收率比辊式强磁选机提升0.93个百分点的前提下,相比原辊式强磁选机精矿量(入磨矿量)减少了4.09个百分点。In In order to improve the pre-concentration accuracy of 20~2 mm grain size before grinding in Meishan Iron Mine,in view of the problems existing in the existing pre-concentration process,such as gangue inclusion in concentrate and large loss of tailings metal,the separation test was carried out on the raw ore of this grain size.The test results show that the concentrate with iron grade of 48.96%and iron recovery of 83.97%can be obtained by pre-concentration of 20~2 mm magnetic pulley concentrate before grinding,and the iron grade is increased by 5.86 percentage points.The average iron grade of concentrate reached 36.79%and tailings grade is 11.01%,respectively,using a new type of high magnetic field force 2RTGX0612 cylindrical permanent magnetic separator.Compared with the existing roller high intensity magnetic separator concentrate iron grade increased by 2.59 percentage points,tailings iron grade decreased by 2.19 percentage points,separation efficiency improved significantly;under the premise that the metal recovery rate is 0.93 percentage points higher than that of the roller high intensity magnetic separator,the concentrate quantity(grinding quantity)of the roller high intensity magnetic separator is reduced by 4.09 percentage points.

关 键 词：预选 磁选 磁场强度 金属回收率 

分 类 号：TD951[矿业工程—选矿]