聚合氯化铝对选择性聚团法制备超纯煤的影响  

Influence of polyaluminum chloride on the preparation of ultra clean coal by selective oil agglomeration

作　　者：董子龙 杨巧文[1] 窦蒙 冯曜 徐菁 刘向辉[1] DONG Zilong;YANG Qiaowen;DOU Meng;FENG Yao;XU Jing;LIU Xianghui(College of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院

出　　处：《煤炭学报》2019年第7期2245-2252,共8页Journal of China Coal Society

基　　金：北京市科技计划资助项目(Z161100002616038)

摘　　要：为探索选择性聚团法制备超纯煤的工艺条件,以太西无烟煤为研究对象,分析了太西无烟煤的性质和矿物质的种类。采用选择性聚团法对超细粉碎后的煤粉进行分选实验,研究了研磨时间、煤油用量、仲辛醇用量和聚合氯化铝用量对精煤灰分和收率的影响,并对比了氯化铝、26%和29%的聚合氯化铝对分选效果的影响。通过Zeta电位仪测定添加不同用量的聚合氯化铝的煤样Zeta电位,利用光学接触角测量仪测定不同聚合氯化铝用量下的太西煤样和人工矿物表面的润湿性,采用DLVO理论计算揭示聚合氯化铝对煤中异类矿物质颗粒间相互作用机制。结果表明,当煤油用量为1.19kg/t、仲辛醇用量为0.40kg/t、聚合氯化铝用量为50g/t、研磨时间为30min时,分选出的超纯煤灰分达到0.64%,精煤产率为68.91%。相同药剂用量下,添加聚合氯化铝比氯化铝的浮选精煤产率高,与未添加聚合氯化铝分选效果相比,精煤灰分降低了0.18%,精煤产率提高了19.38%。当26%和29%聚合氯化铝用量为50g/t时,两者精煤产率都达到最大,分别为68.91%和75.00%,精煤灰分分别为0.64%和0.71%,添加26%聚合氯化铝比29%聚合氯化铝脱灰效果好。随着聚合氯化铝用量的增加,煤的Zeta电位值不断增加,由-28.7mV增加到-20.63mV。添加聚合氯化铝后煤的接触角增加,疏水性增强,人工矿物表面亲水性增加,煤与人工矿物表面差异性增大。随着聚合氯化铝用量的增加,煤表面Zeta电位值不断增加,由-28.7mV增加到-20.63mV。添加聚合氯化铝后煤接触角增加,然而,人工矿物接触角减少,由于煤的疏水性和人工矿物亲水性增加,导致两者表面性质差异增大。根据DLVO理论计算,聚合氯化铝增强了煤与蒙脱石颗粒之间斥力作用,同时增加了煤中无机矿物质的团聚效果,减少了无机矿物质对煤颗粒表面罩盖和异质细泥夹带作用,降低了精煤灰分。聚合氯化铝和氯化In order to explore the preparation conditions to produce ultra clean coal by selective oil agglomeration,Taixi anthracite was investigated in this study,including the properties of Taixi anthracite coal and the mineral types in coal.The selective oil agglomeration method was used to sort the ultrafine pulverized coal.The effect of the grinding time,kerosene dosage,2- octanol,polyaluminum chloride and aluminum chloride on the ash content and yield of clean coal were discussed.The effects of aluminum chloride,26% polyaluminum chloride and29% polyaluminum chloride on the sort efficiency were compared.Zeta potentiometer was used to measure the zeta potential of coal samples with different dosages of polyaluminum chloride.The wettabilities of Taixi coal sample and artificial mineral surface at different dosages of polyaluminum chloride were measured by optical contact angle meter.The interaction mechanism between polyaluminum chloride and heterogeneous mineral particles in coal was revealed by DLVO theoretical calculation.The results show that the ash content of ultra clean coal is 0.64% and the yield of clean coal is 68.91% when kerosene content is1.19 kg/t,sec-octanol content is 0.40 kg/t,polyaluminum chloride content is 50 g/t and grinding time is 30 min . At the same dosage a higher clean coal yield was achieved with polyaluminum chloride than that with aluminum chloride.Compared with the separation effect without polyaluminum chloride,the ash content of the clean coal decreases by 0.18%,and the clean coal yield increases by19.38%.When the dosage of polyaluminum chloride26% and29% is 50 g/t,the clean coal yield reaches the maximum of 68.91% and 75.00% respectively.The ash contents of clean coal are 0.64% and 0.71% respectively.The effect of demineralization with26% polyaluminum chloride is better than that with29% polyaluminum chloride.With the increase of polyaluminum chloride,the Zeta potential value of coal increased from -28.7 mV to -20.63 mV.The contact angle of coal increased with the addition of polyalumin

关 键 词：超纯煤 选择性聚团 聚合氯化铝 DLVO理论 

分 类 号：TD94[矿业工程—选矿]