不同水煤浆分散剂与煤之间的相互作用规律研究Ⅺ分散剂改性煤粒的界面性质及其对CWS性质的影响  

Study on the interaction between different CWS dispersants and coals Ⅺ Interface properties of dispersant-modified coal particles and its effect on the properties of CWS

作　　者：邹立壮[1] 朱书全[1] 王晓玲[1] 郭相坤[1] 崔广文[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《燃料化学学报》2006年第2期160-165,共6页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(50074033)

摘　　要：测定了10种分散剂与14种煤所形成分散体系的Zeta电位,研究了分散剂对改性煤粒界面电化学性质的影响。结果表明,煤的变质程度越低、溶出高价离子越多,分散剂改性煤粒的Zeta电位越低。阴离子分散剂亲水基团的数量和所带电荷越多,改性煤粒的Zeta电位越高。非离子分散剂使改性煤粒的Zeta电位降低。阴离子分散剂改性的煤粒,Zeta电位大小能很大程度反映煤粒的亲水性强弱,很多阴离子分散剂改性煤粒的Zeta电位都与其吸水量成正相关。建立了包括煤自身亲水性(Mad)、分散剂亲水改性程度(△MHC),以及Zeta电位(ζ)和分散剂在单位煤表面积上的吸附量(Γs)在内的成浆性经验模型:CFV=76.62-1.896Mad-3.430△MHC+0.489Γs.ζ。该模型的计算值与实验结果很相近,而且还能反应出各变量对煤的成浆性所产生的影响。The Zeta potential of dispersion system forming by 10 dispersants with 14 coals was determined. The effect of dispersant on the interface electro-chemical property of coal particles was studied. The higher the coal rank and the more the dissolved high-valence cations from coal, the lower the Zeta potential of dispersant-modifled coal particle. The more the amount of hydrophilic groups and the charge of the anionic dispersant, the higher the Zeta potential of dispersant-modified coal particle. The non-ionic dispersant leads to a decrease in the Zeta potential of dispersant-modified coal particle. In general, the Zeta potential of anionic dispersant-modified coal reflects its hydrophilicity. The maximum moisture content for most of dispersant-modified coal particles increases with increasing Zeta potentials. An experiential slurryability model including natural and dispersant-modified hydrophilicity of coal particle （ Mad, ΔMHC） , the Zeta potential of dispersant-modified coal particle （ ξ ） and the adsorption amount of dispersant on unit surface area of coal （ Γs ） has been set up. It can be expressed as following： Cry = 76.62-1. 896 Mad -3.430ΔMHC ＋ 0. 489Γs·ξ. The calculated value from this formula is approximate to the experimental result.

关 键 词：水煤浆 分散剂 界面性质 

分 类 号：TQ530[化学工程—煤化学工程]