Chinese National Engineering Research Center of Coal Preparation and Purification,China University of Mining &Technology School of Chemical Engineering and Technology.China University of Mining & Technology Kailuan (Group) Limited Liability Company

为探索微细粒黏土矿物在煤泥浮选过程中的罩盖行为,进一步回收利用稀缺的炼焦煤资源,以钱家营选煤厂灰分为49.3%的浮选中煤为研究对象,进行了螺旋抛尾和磨后浮选试验。结果表明,当要求精煤灰分为12.5%时,螺旋粗精煤磨煤3.5 min后可获得最高的精煤产率,高灰细粒黏土矿物的罩盖是精煤灰分不达标的主要原因。根据对煤-黏土颗粒体系相互作用势能计算分析,提出通过改变静电力和范德华力2种调控手段降低黏土矿物的回收率,但调控静电力抑制浮选过程细泥罩盖与细泥沉降浓缩又存在着难以调和的矛盾,通过在疏水性煤颗粒表面引入纳米气泡层,进而改变体系的Hamaker常数,使得通过调控范德华力来降低黏土矿物的罩盖成为可能。

in order to explare the fotatio behavior f ultr -fine clay and make ful ise of scarce coking cal.the fiotation middlings with49.3% ash content collected fom Cianjiaying Ccal Preparatio Plant and the process o talings discarding by spiral separator integrate with grinding-fatation was caried ou inthe present papet. The resuis showed that the maxinun y eld with 12.5% ash content was cotained when 3.5 min grinding time was adopted.The high ash content concentrated weremainlyatiributed to the ultr - fine clay minerals coating.Acording to the caculaton of iner- paricle potentialfor coa-clay system,two regulation methods were proposed by nodulating the elecrostatic foce or van der Wals force to lower the cay recovery tshould be nofed that the inibiion ofthe clay coatig was contradict with the efiective slime settement.Nevertheless the introdution of nancbuble layer may be the appropriate weay to conrol the clay coating in future becauseof the considerable change of the system Hamaker constant.

贵州省“125计划”重大科技专项资助项目(黔教合重大专项字[2013]026号)；“十二五”国家科技支撑计划资助项目(2014BAB01B03)；