梅山铁矿精确化磨矿工业试验研究

为了提高磨矿均匀性和降低磨矿过程成本, 梅山铁矿选矿厂在四系列进行了精确化磨矿工业试验。结果表明, 与应用前相比, 二段分级溢流产品中平均粒度加粗10%；合格粒级含量提高1.82个百分点, 提高幅度为2.35%；-10 μm粒级含量降低了1.05个百分点, 降低幅度为6.91%。磁选尾矿中-10 μm粒级含量下降15.56个百分点, 降低幅度25.52%；平均粒度加粗0.06 mm, 加粗幅度150%。同时磨机功耗下降1.68 kWh/t, 钢球单耗下降0.1 kg/t, 磨机噪音下降2~6 dB, 磨矿矿浆温度降低0.5~2 ℃, 一段磨磨机衬板使用寿命估计可延长6个月, 二段磨磨机衬板使用寿命可延长1年以上, 折合降低磨矿成本1.70元/t, 取得了非常显著的节能降耗效果。四系列研究成果已经在其他系列同类型磨矿作业中推广应用。

Commercial Tests on Precise Grinding of Iron Ore from Meishan Iron Mine

In order to obtain homogeneous grinding fineness and lower grinding cost, commercial tests on precise grinding were conducted for №4 product line of concentrator in Meishan Iron Mine. Results showed that after optimization, the average fineness of the overflow from the second stage of classification increased by 10%. The rate of particles with qualified size increased 1.82 percentage points, a 2.35% rise, while the rate of particles at the grinding fineness of -10 μm decreased 1.05 percentage points, a fall of 6.91%. As for the tailings from magnetic separation, the rate of particle size of -10 μm range decreased 15.56 percentage points, a fall of 25.52%, and an average increase of 0.06 mm in particle size, a 150% rise. Meanwhile, the power consumption dropped 1.68 kWh/t, the ball consumption dropped 0.1 kg/t, the processing noise dropped by 2~6 dB and the pulp temperature decreased by 0.5~2 ℃. Consequently, the service life of mill liners for the first stage and the second stage of milling can be extended for around six months and over a year, respectively, equivalent to a 1.70 RMB/t reduction in cost. This research results have been applied into milling operations of other series.