利民选煤厂煤泥水沉降效果研究  

A study of the effects of coal slurry sedimentation at Limin Coal Preparation Plant

作　　者：朱志鸿 刘宸 潘海军 黄显武[3] ZHU Zhihong;LIU Chen;PAN Haijun;HUANG Xianwu(Inner Mongolia Limin Coke Co.Ltd.,Erdos O017000,China;Wuhai Energy Co.Ltd.,China National Energy Group,Wuhai 016000,China;Inner Mongolia University of Science&Technology,Baotou 014010,China)

机构地区：[1]内蒙古利民煤焦有限责任公司,内蒙古鄂尔多斯017000 [2]国家能源集团乌海能源有限责任公司,内蒙古乌海016000 [3]内蒙古科技大学,内蒙古包头014010

出　　处：《选煤技术》2023年第3期49-54,共6页Coal Preparation Technology

摘　　要：针对煤泥水沉降效果不佳而导致的循环水浓度较高的问题,利民选煤厂以一段浓缩池溢流为研究对象,基于其矿物组成、粒度组成和浓度分析,通过自然沉降试验、絮凝沉降试验和凝聚-絮凝沉降试验对煤泥水沉降效果进行了研究。研究结果表明:该厂煤泥水中固体颗粒以微细粒为主,且含有大量高岭石等黏土类矿物,无法通过自然沉降达到循环水使用标准;阳离子型聚丙烯酰胺(PAM-1200)可加速煤泥水沉降,提高煤泥水澄清效果,在PAM-1200配置浓度为0.4%、药剂用量为8 g/t时,煤泥水沉降速度最快,上清液浊度降至75 NTU,可作为循环水使用;将聚合氯化铝(PAC)与PAM-1200联合使用,煤泥水沉降效果得到进一步改善,在PAM-1200用量为8 g/t、总药剂用量为108 g/t时,沉降速度最大,上清液浊度降低至38 NTU,比单独使用PAM-1200时降低了37 NTU。将凝聚剂和絮凝剂联合使用,可利用凝聚剂压缩双电层和絮凝剂的“架桥”作用,加速煤泥水沉降,提高煤泥水沉降效果。The circulating water of Limin Plant is rendered considerably high in concentration due to low slurry sedimentation efficiency.To address this issue,the overflow of the Ist-stage thickening pond is taken as the object of study and both its mineral and size compositions are analyzed.Based on the results of analysis,experimental study is conducted on the slurry sedimentation efficiencies that can be obtained in the case of using respectively the natural settling,flocculating settling and coagulating-flocculating settling methods.As revealed by study results,the plant's slurry water contains predominantely fine particles and high proportions of clay minerals like kaolinite,which is unable to meet the standard for use as circulating water solely through natural sedimentation;the use of cationic polyacrylamide PAM-1200 can accelerate slurry settling process and lead to improved water clarification result,and a highest slurry settling rate can be obtained when PAM-1200 is used at a concentration of 0.4%and a dosage of 8 g/t,and in this case,the supernatant has a turbidity as low as 75 NTU,making it possible for use as circulating water;the combined use of polymeric aluminium chloride(PAC)and PAM-1200 can lead to further improved slurry settling efficiency,and with the dosage of PAC at 8 g/t and a total dosage of the two agents at 108 g/t,the slurry can see a highest settling rate,allowing the turbidity of supernant to be further reduced to 38 NTU,a decrease of 37 NTU compared to the case of using PAM-1200 alone.It is demonstrated that when coagulant and flocculant are used in a mixed manner,the former's double-electric layer compression action coupled with the latter's bridging action can help accelerate slurry settling rate and hence improve slurry sedimentation result.

关 键 词：煤泥水处理 煤泥水沉降 凝聚-絮凝沉降试验 絮凝剂 凝聚剂 上清液浊度 

分 类 号：TD946.2[矿业工程—选矿]