不同碎磨方式下紫金山金铜矿石的磨矿动力学行为

发布时间：2018-03-13 23:07

本文选题：高压辊磨机　切入点：磨矿动力学　出处：《中南大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：对紫金山金铜矿石进行高压辊磨和颚式破碎,然后对2种产品进行分批磨矿试验,基于磨矿动力学原理,借助MATLAB软件分析2种产品磨矿过程中各个粒级的磨矿速度,采用扫描电镜(SEM)对产品表面的微裂纹进行表征,并对磨矿产品的分布特性进行分析。研究结果表明:在磨矿初期,微裂纹是影响磨矿速度的主要原因,微裂纹越多,磨矿速度越快,高压辊磨产品的磨矿速度大于颚式破碎产品的磨矿速度;在粗级别(0.20~3.20 mm)中,高压辊磨产品磨矿速度高于颚式破碎产品的磨矿速度,而且粒度越大,微裂纹数量相差越大,磨矿速度相差越大;随着磨矿时间增加,磨机中粗粒级的质量分数越来越小,微裂纹也越来越少,磨矿概率成为影响磨矿速度的主要原因,高压辊磨产品的磨矿速度等于颚式破碎产品的磨矿速度;高压辊磨碎磨工艺可以使磨矿产品粒度分布更加均匀,优化粒度组成。
[Abstract]:The high pressure roller mill and jaw crushing of Zijinshan gold and copper ore were carried out, and then the batch grinding tests were carried out on the two kinds of products. Based on the grinding dynamics principle, the grinding speed of each grain level in the grinding process of the two products was analyzed with the help of MATLAB software. The microcracks on the surface of the products were characterized by SEM and the distribution characteristics of the grinding products were analyzed. The results show that the microcracks are the main factors affecting the grinding speed in the early stage of grinding, and the more the microcracks are, the more the microcracks are. The faster the grinding speed is, the faster the grinding speed of the high-pressure roller mill product is than the grinding speed of the jaw crushing product, and the higher the grinding speed of the high-pressure roller mill product is, the faster the grinding speed of the high-pressure roller mill product is than the grinding speed of the jaw crushing product, and the larger the particle size is, With the increase of grinding time, the mass fraction of coarse particles in the mill becomes smaller and smaller, and the micro-crack is less and less. The grinding probability becomes the main reason to affect the grinding speed. The grinding speed of high-pressure roller mill products is equal to that of jaw crushing products, and the high-pressure roller grinding process can make the particle size distribution of grinding products more uniform and optimize the particle size composition.
【作者单位】：辽宁科技大学矿业工程学院;福州大学紫金矿业学院;东北大学资源与土木工程学院;
【基金】：国家自然科学基金资助项目(51374079)~~
【分类号】：TD921.4;TD95

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