江西某钨矿选矿厂精确化磨矿研究  

Precision Grinding-Classification Circuit Adopted by Tungsten Ore Dressing Plant in Jiangxi

作　　者：徐寒冰 刘瑜[1] 曾志飞[1] 黄光耀[1] XU Han bing;LIU Yu;ZENG Zhi fei;HUANG Guang yao(Changsha Research Institute of Mining and Metallurgy Co Ltd,Changsha 410012,Hunan,China)

机构地区：[1]长沙矿冶研究院有限责任公司

出　　处：《矿冶工程》2019年第5期34-37,40,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51574041)

摘　　要：针对某钨矿密度大、易脆,在磨矿分级回路中易过粉碎而导致分级溢流中-0.010 mm粒级含量增加的问题,测定了该矿石的力学性质,通过球径半理论公式计算出了有效的磨矿钢球尺寸及其配比,并进行了工业验证试验。结果表明,磨矿介质优化后,磨机处理量提高了1.99 t/h,磨机排矿中过粉碎粒级-0.010 mm含量降低了1.09个百分点,易选粒级-0.15+0.010 mm金属分布率增加了15.36个百分点;螺旋分级机溢流-0.074 mm粒级含量增加了2.09个百分点,-0.010 mm粒级含量减少了4.74个百分点、金属分布率减少了10.96个百分点,易选粒级-0.15+0.010 mm含量增加了7.95个百分点、金属分布率增加了12.18个百分点;磨矿介质优化后,钢球消耗降低了0.17 kg/t,电耗降低了1.74 kWh/t,节能降耗效果显著。A fragile tungsten ore with high specific gravity is prone to be over ground,leading to an increased content of size fraction-0.010 mm generated in the grinding classification circuit.Based on the mechanical characteristics of this ore,the effective size of steel balls for ball milling and their ratio were calculated using semi theoretic equations,and a commercial test was conducted.For the grinding process,after the optimization of milling media,the mill capacity increases by 1.99 t/h and the content of the tungsten ore over ground to-0.010 mm fraction in the mill output is reduced by 1.09 percentage point,while the easy to separate ore within the-0.15+0.010 mm fraction increases by 15.36 percentage points.For the classification process,-0.074 mm fraction in the spiral classifier overflow increases by 2.09 percentage points,-0.010 mm fraction decreases by 4.74 percentage points,and the metal distribution rate therein decreases by 10.96 percentage points,while-0.15+0.010 mm fraction increases by 7.95 percentage points,and its metal distribution rate increases by 12.18 percentage points.After the optimization of ball proportion,the steel ball consumption falls by 0.17 kg/t,and the electricity consumption of mill is reduced by 1.74 kWh/t,showing a significant reduction in energy consumption.

关 键 词：钨 分级 磨矿 精确化磨矿 磨矿介质 过粉碎 易选粒级 节能降耗 

分 类 号：TD921[矿业工程—选矿]