半工业磨机中钢球尺寸对黑钨矿细度和形状影响研究  

Influence of the Ball Size on Fineness and Shape of Wolframite in A Lab-Scale Ball Mill

作　　者：石贵明 周意超 SHI Guiming;ZHOU Yichao(School of Chemical Biology and Environment,Yuxi Normal University,Yuxi 653100,China)

机构地区：[1]玉溪师范学院化学生物与环境学院,云南玉溪653100

出　　处：《有色金属工程》2022年第2期75-84,120,共11页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51964044);云南省地方高校(部分)联合专项项目(2018FH001-051);云南省教育厅项目(2019J0738);云南省大学生创新创业训练计划项目(202011390028)。

摘　　要：黑钨矿极易发生泥化,导致其有效浮选成为选矿中的一个难题。在实验室球磨机中,探讨了不同尺寸的钢球作为介质对黑钨矿细度和形状的影响,在干磨条件下进行了6种不同球径(20、30、40、50、60、70 mm)的磨矿试验。结果表明:各尺寸钢球介质下获得的产品粒径均随磨矿时间的增加而减小,以d=70 mm钢球为磨矿介质时,大颗粒含量最低,-10μm过磨颗粒含量最高。粒径比x_(80)/x_(20)随着产品颗粒尺寸的减小先增大后减小,且每种球径下产品颗粒越细,x_(80)/x_(20)越平缓,相同的磨矿时间下,粒径比x_(80)/x_(20)随球径的减小先增大后减小,其中d=40 mm钢球为磨矿介质的粒径比x_(80)/x_(20)最大。中值粒径x_(50)随球径的减小先减小后增大,其中球径为40 mm时x_(50)最小(x_(50)=0.06 mm),但当球径小于40 mm时,破碎混合颗粒物料的粉碎能力会减弱。当球径小于40 mm时,粒径比x_(90)/x_(10)越来越大,粒径比(x_(90)-x_(10))/x_(50)随着产品颗粒粒径减小先增大后减小,减小趋势随着球径的减小而趋于平缓,在x_(50)为0.075~0.085 mm范围内达到最大,而在20 mm球径下,(x_(90)-x_(10))/x_(50)磨矿产品尺寸几乎是不变的,其值为20.66。产品颗粒粒径小于1 mm时,产品颗粒球形度急剧增加,且随着球径的减小,球形度增加更快,产品颗粒粒径小于0.04 mm时,产品颗粒球形度的变化趋于平缓,这可能是磨机内表面和球表面形成了黏附颗粒层,0.8~0.3 mm颗粒的球形度变化趋势小于0.3 mm以下颗粒的球形度变化趋势。Wolframite is very apt to be slimed which caused the effective flotation of it would be a difficult problem.The different sizes of steel balls as media on the fineness and shape of a wolframite in laboratory ball mill was investigated.The grinding experiments were carried out with six different diameter balls under dry conditions.The results show that the particle size of products obtained in all sizes of steel ball media decreases with the increase of grinding time,the large particles content are the lowest while the-10μm overgrinding particles content are the highest with the d=70 mm steel ball as media.The particle size ratio of x_(80)/x_(20) increases first and then decreases with the decreases of the product particle size,and the finer the product particle size under each ball diameter,the gentler x_(80)/x_(20),the particle size ratio of x_(80)/x_(20) increases first and then decreases with the decrease of the ball diameter in the same grinding time,and the particle size ratio of x_(80)/x_(20) is the largest with d=40 mm steel ball.The median particle size x_(50) first decrease and then increase with decreasing ball size and which is minimum(x_(50)=0.06 mm)for 40 mm,the grinding ability is weakened for crushing mixed granular materials when the ball diameter is less than 40 mm.When the ball diameter is less than 40 mm,the particle size ratio x_(90)/x_(10) becomes larger and the particle size ratio(x_(90)-x_(10))/x_(50) first increase and then decrease with decreasing product size and the decreasing trend become more and more flat with decreasing ball diameter,reaching the maximum when x_(50) in the range of values of 0.075~0.085 mm,the ratio of(x_(90)-x_(10))/x_(50) is almost constant for the product size and the value is 20.66 for d=20 mm ball.When the product particle size is less than 1 mm,the sphericity of product particle sharply increase and increase faster with decreasing ball diameter,the product particle size is less than 0.04 mm,the change trend of sphericity of product particles become flat which

关 键 词：黑钨矿 钢球尺寸 细度 粒度分布宽度 颗粒形状 

分 类 号：TD453[矿业工程—矿山机电]