摘要
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%;-10μm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-10μm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。
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.
引文
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