稀缺主焦煤重介中煤解离特性的研究  

Study on characteristics of scarce coking coal heavy medium separation system′s middling product after liberation crushing

作　　者：刘锋[1] 马芳源 丁晴晴[2] LIU Feng;MA Fangyuan;DING Qingqing(Huaibei Coal Preparation Plant,Huaibei Mining(Group)Co.Ltd.,Huaibei,235000,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]淮北矿业(集团)有限责任公司淮北选煤厂,安徽淮北235000 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《选煤技术》2021年第2期7-13,共7页Coal Preparation Technology

基　　金：国家自然科学基金资助项目(51374206)。

摘　　要：为了探究中煤适度破碎解离后的特性,以淮北选煤厂重介中煤为研究对象,通过筛分、浮沉试验分析了重介中煤粒度分布和可选性,并通过破碎解离获得合格精煤的可能性。通过对重介中煤进行破碎粒度上限为6、3、1、0.5 mm的破碎解离试验,进一步分析了不同破碎粒度上限条件下重介中煤密度组成及解离特性。试验结果表明:在特定灰分条件下,破碎粒度上限越细,煤与矸石解离度越高,对应的理论精煤产率越高。当重介中煤破碎粒度上限<0.5 mm时,获得的精煤产率约为35%,相比破碎前产率提高了27个百分点。综合考虑磨矿能耗和后续分选及脱水作业复杂性等因素,确定最佳解离粒度为0.5 mm。The middling product of the rare coking coal heavy medium separation system of Huaibei Coal Preparation Plant is taken as the object to explore the characteristics of the middling product after proper liberation crushing.The size distribution and washability of the product and the feasibility of obtaining up-to-standard clean coal product.Test is also made on liberation crushing of the middling down to an upper size limit of 6 mm,3 mm,1mm and 0.5 mm to analyze the density consist and liberation characteristics of the middling at different crushing sizes.Test results show that under specific ash conditions,the finer the crushing size,the higher the coal-mineral liberation level,and hence the higher the theoretical yield of clean coal;and when the middling is crushed down to a size with an upper limit of 0.5 mm,the yield of clean coal is around 35%,which is 27%more compared with the figure before the middling is crushed.In overall consideration of the factors of consumption of grinding energy and complexity of subsequent separation and dewatering operations,the optimal crushing size is determined to be 0.5 mm.

关 键 词：中煤再选 重介中煤 破碎解离 破碎粒度上限 最佳解离粒度 

分 类 号：TD94[矿业工程—选矿] TD712