In this paper,the wear and grinding of a large number of accumulation pebbles produced from SAG were studied in the laboratory scale mills.For the Samples and pebbles came from Yinshan Mineral Industry Company of Jiangxi Copper Corporation in Jiangxi province,the alone pebble wear and pebble grinding effect tests were carried out.The results showed that the SAG pebble can be used as a media in the mill,the wastage is larger than the steel ball wastage (about 0.05％),typically 1％-2％.The wear rate of pebble is linear increased with the time,first increased then decreased with the filling rates,first increased then decreased with the concentration,increased dramatically with the pebble size,maximum wear when filling rate is 40％.The trend of fineness with time is increased quickly,flatted after the 20 min,gradually declined between the filling rate of 30％ to 70％,declined after rising with the concentration,declined after rising with the pebble size.Maximum fineness and maximum content of -10 microns achieved when the concentration is 60％ and the best grinding effect achieved when the pebble is-40 + 30 mm fractions.At the same time,grading curves of final product are similar under different conditions,the grinding rate of-0.125 +0.045 mm fraction is the biggest.%在实验室小型圆锥球磨机内,利用大量堆积的半自磨机顽石作为磨矿介质并对其损耗和磨矿进行了研究.样品和顽石均来自江西省江西铜业集团公司银山矿业,实验内容包括磨矿时间、充填率、磨矿浓度和顽石大小等条件试验.试验结果表明,半自磨机顽石介质损耗量比传统钢球损耗量(约0.05％)偏高,一般介于1％～2％.顽石的磨损率随着时间基本呈现线性增加的关系,随着充填率先增加后减小,在40％充填率时达到最大磨损,随着浓度也是先增加后减小,随着顽石尺寸增大而急剧增加.磨矿细度随时间的趋势呈现刚开始增加很快,过了20 min后趋势基本变平缓,在30％～70％充填率时呈现逐步下降的趋势,随浓度增加呈现先上升后下降趋势,在60％浓度时达到最大细度,同时过粉碎粒级(-10μm)含量也达到最大,随顽石尺寸增大呈现先上升后下降的趋势,-40+30 mm大小的顽石磨矿效果最好.同时,在不同条件下的最终产品粒度曲线基本相似,-125 +45μm粒级的磨矿速率最大.
展开▼
