选择性磨矿对含钒石煤单体解离的影响研究  

Research on the Effect of Selective Grinding on the Liberation of Vanadium-bearing Stone Coal

作　　者：刘春[1] 张一敏[1,2,3] 包申旭[1,3] 汤家焰[1] 

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070 [2]武汉科技大学资源与环境工程学院,武汉430081 [3]钒资源高效利用湖北省协同创新中心,武汉430070

出　　处：《有色金属（选矿部分）》2016年第5期39-44,87,共7页Nonferrous Metals（Mineral Processing Section）

基　　金："十二五"国家科技支撑计划项目(2015BAB03B05)

摘　　要：为研究磨矿介质对石煤选择性磨矿的影响,分别考察了钢棒和钢球两种磨矿介质对湖北通山焙烧脱碳石煤在三辊四筒磨机中的选择性磨矿效果并确定合适的磨矿介质,然后通过浮选试验和云母解离度分析确定合适的磨矿细度。结果表明,由于含钒云母及各种脉石矿物的可磨性存在较大的差异,球磨与棒磨均有选择性磨矿的效果,即细粒级(-38μm)和粗粒级(+104μm)V2O5品位较高,中间粒级(-104+38μm)V2O5品位较低,但棒磨产品粒度更均匀,粒级间V2O5的品位极差更大,棒磨的选择性磨矿效果优于球磨。浮选试验和云母的解离度分析均表明,最佳的棒磨磨矿细度为-74μm含量为84.62%,对应的最终精矿V2O5的品位为1.06%,回收率为84.65%。通过棒磨选择性磨矿,可在较低的磨矿细度和简单的浮选工艺流程条件下,实现含钒云母的富集并有效地降低提钒的处理量、酸耗和生产成本。For investigating into the influence of grinding medium on selective grinding of stone coal, based on the comparison of selective grinding effect by grinding medium （steel bar and steel ball） in triple-rollers and fourdrums mill for the decarburized stone coal by roasting from Hubei Tongshan, suitable grinding medium was determined, and the appropriate grinding fineness is confirmed through the flotation test and process mineralogy. The results showed that both ball mill and rod mill exhibited the characteristic of selective grinding due to the relatively big grindability differences between vanadium-bearing mica and gangue minerals, where the V2O5 grade was high in the fine fractions （ -38 μm） and coarse fractions （ ＋ 104 μm）, while it was low in the middle （ -104 ＋38 μm）. However, in the rod milling products, the size distribution was more uniform and V2O5 grade range among size fractious was larger than that of ball milling products. Hence, selective grinding effect of rod mill is superior to that of the ball mill. Both flotation tests and mica liberation analyses showed that the best grinding fineness by rod mill was 84. 62% passing 74 μm and the final concentrate was obtained with V2O5 grade of 1.06% and recovery of 84. 65%. Through selective grinding by rod mill, under the conditions of lower grinding fineness and simpler flotation process, vanadium-bearing mica can be enriched, and handling quantity, acid consumption and production cost can be effectively reduced during vanadium extraction.

关 键 词：含钒石煤 磨矿介质 选择性磨矿 浮选 解离度 

分 类 号：TD921.4[矿业工程—选矿] TD954