氧化铝厂粗磨机棒径优化

Optimization of Rod Mill Media Size in Alumina Ore-dressing Plant

通过测定矿石力学性质和给矿粒度组成,优化棒磨机棒径,并与现场磨机磨矿结果对比.结果表明,矿石整体较硬且韧性较大,但有部分矿较易泥化,铝土矿可选择性磨矿;粗磨矿粒度较粗,矿粉很少,小于0.074 mm的矿粉仅占2.98%;与现场100 mm棒径磨机磨矿结果相比,按棒径半理论公式计算的80 mm棒径磨机的磨矿细度(小于0.074 mm的产率γ?0.074 mm)提高了6.51%,小于0.9 mm的产率γ?0.9 mm提高了4.00%,小于0.9 mm的生产能力q?0.9 mm提高了4.76%.棒径优化对提高磨机生产能力及磨矿细度作用明显.

Ore mechanical properties, feed size distribution and optimization of rod mill media size were conducted, and moreover, compared with the outcome of mill grinding in alumina ore-dressing plant. The results indicate that the selective grinding of hard and tough ore samplecan be achieved, and fine mud is easy to come into being, feed size is coarse and the fraction of less than 0.074 mm accounts for 2.98%, compared 80 mm rod medium calculated by semi-theory formula with previous 100 mm used in plant, the grinding fineness （fraction of less than 0.074 mm, γ〈0.074mm） increases by 6.51%, fraction of less than 0.9 mm （γ〈0.9 mm） increases by 4.00%, production capacity of less than 0.9 mm （q〈0.9 mm） increases by 4.76%. Rod-diameter-precision has obvious effects on the raise of production capacity and grinding fineness of rod mill.