钢锻作细磨介质下的磨矿能耗与粒度分布特征

Grinding energy consumption and particle size distribution characteristics of steel forging under fine grinding medium

钢锻是一种线接触为主的磨矿介质.以1.18～2 mm、0.6～1.18 mm、0.3～0.6 mm 3个粒级样以及实际生产二段沉砂样为研究对象,分别采用等质量的钢球和钢锻进行分批次磨矿试验,分析了其磨矿产品的粒度分布和磨矿能耗分布.结果表明,钢锻作为细磨介质,与钢球相比,磨矿产品有着相同的粒度分布规律,符合JK粒度破碎模型.但在相同磨矿条件下,钢锻磨矿时生产能力比不上钢球.但随着给料粒度的变细,钢锻的磨矿效果开始显现,其磨矿产品中P80值与钢球的差异相差为0.22%,而t10值与钢球的差异相差为2.23%.与此同时,磨矿产品中<0.010 mm的含量明显低于钢球,过粉碎轻.当采用<0.425 mm实际钨矿石作为入磨样品验证时,有着上述相同的结论,从理论上说明了钢锻虽然磨矿能力逊色于钢球,但钢锻产生的合格粒级含量高于钢球,过粉碎情况轻于钢球,对于脆性矿物的细磨是一种优良的磨矿介质选择.

Steel forging is a kind of grinding medium dominated by wire contact.The three-stage sample of1.18-2mm,0.6-1.18mm and0.3-0.6mm and the actual production of the second-stage sedimentation sample were taken as the research object,and the batch grinding test was carried out by using equal-quality steel balls and steel forging.The particle size distribution and grinding energy distribution of the grinding products were analyzed.The test results show that steel forging is a fine grinding medium.Compared with steel balls,grinding products have the same particle size distribution law and conform to the JK particle size fracture model.However,under the same grinding conditions,the steel forging and grinding is not as productive as steel balls.However,as the feed particle size becomes finer,the grinding effect of steel forging begins to appear.The difference between the P80value and the steel ball in the grinding product is only0.22%,and the difference between the t10value and the steel ball is only2.23%.At the same time,the content of<0.010mm in the grinding products is significantly lower than that of the steel balls,and the crushing is light.When the actual tungsten ore of<0.425mm is used as the sample for grinding,the same conclusions are given above.Theoretically,although the steel forging is inferior to the steel ball,the qualified grain content of the steel forging is higher than that of the steel ball.,the pulverization is lighter than the steel ball,and the fine grinding of brittle minerals is an excellent grinding medium choice.