转速率与半径比对大型球磨机磨球抛落特征影响规律  

Effect of Mill Speed Ratio and Radius Ratio on the Steel Ball Cataracting Characteristics in a Large-scale Mill

作　　者：尹自信 彭玉兴[1,2] 李同清[1,2] 倪旭[1,2] 常向东[1,2] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116 [2]中国矿业大学江苏省矿山机电装备重点实验室,江苏徐州221116

出　　处：《有色金属（选矿部分）》2016年第4期66-71,86,共7页Nonferrous Metals（Mineral Processing Section）

基　　金：国家自然科学基金资助(51475458);教育部新世纪优秀人才支持计划项目(NCET-12-0960);江苏省高校青蓝工程;江苏省六大人才高峰项目(ZBZZ-045)

摘　　要：为了掌握转速率与半径比对大型球磨机磨球抛落特征影响规律,以中信重工设计的国内最大型半自磨机Ф10.37 m×5.19 m为研究对象,基于经典球磨机磨球运动理论,建立大型球磨机磨球抛落特征与转速率、半径比的关联模型,分析了转速率和半径比对大型球磨机抛落角、抛落速度、抛物线方程、冲击速度的影响规律。研究结果表明,抛落角随着转速率的增大逐渐减小,半径比越大,减小速度越快;磨球脱离筒体时,抛落速度随转速率直线增加,增加的斜率为ξk(gRo)1/2;考虑筒体与磨球相对转速差,磨球冲击衬板时的速度出现尖点,并在尖点处冲击速度具有极大值,最外层的冲击速度极大值为14.39 m/s;以ξk=1为例,考虑相对速度后,在转速率小于75%的切向速度增加了5.2458 m/s,在转速率大于75%的切向速度减小了5.2458 m/s。上述研究为大型球磨机磨球分层运动提供理论基础和技术支持,对提高大型球磨机生产效率具有重要意义。In order to obtain the effect of mill speed ratio and radius ratio on steel ball cataracting characteristics, the classic ball mill theory was carried out to analyzed the steel ball cataracting characteristic in a large-scale mill with diameter 10.37 m and length 5.19 m, which was designed by CITIC. HIC in China. Then the effect of mill speed ratio and radius ratio on steel ball kinematic characteristic was addressed and the leaving angle, leaving velocity, parabolic equation and collision velocity was obtained. It is found that the smaller the leaving angle, the larger the corresponding leaving velocity. The leaving angle of steel ball decreases with the mill speed ratio increasing, while the leaving angle is increasing in a straight slope ζ k （gRo）1/2. Moreover, taking the relative tangential velocity into account, the turning point of collision velocity of outer layer occurs with the maximum velocity 14.39 m/s. For instance, in outer layer, below 75% of mill speed, the tangential velocity is increased by 5.2458 m/s, while above it is decreased by 5.2458 m/s. The above research will supply the theoretical basis and data support for improving the grinding efficiency of a large-scale mill.

关 键 词：大型球磨机 转速率 半径比 抛落特征 

分 类 号：TD453.1[矿业工程—矿山机电]