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
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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 = 76.621.896Mad 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。Abstract: The Zeta potential of dispersion system forming by 10 dispersants with 14 coals was determined. The effect of dispersant on the interface electrochemical property of coal particles was studied. The higher the coal rank and the more the dissolved highvalence cations from coal, the lower the Zeta potential of dispersantmodified coal particle. The more the amount of hydrophilic groups and the charge of the anionic dispersant, the higher the Zeta potential of dispersantmodified coal particle. The nonionic dispersant leads to a decrease in the Zeta potential of dispersantmodified coal particle. In general, the Zeta potential of anionic dispersantmodified coal reflects its hydrophilicity. The maximum moisture content for most of dispersantmodified coal particles increases with increasing Zeta potentials. An experiential slurryability model including natural and dispersantmodified hydrophilicity of coal particle (Mad,ΔMHC), the Zeta potential of dispersantmodified coal particle (ζ) and the adsorption amount of dispersant on unit surface area of coal (Гs ) has been set up. It can be expressed as following: CFV = 76.621.896Mad 3.430△MHC+0.489Γs·ζ. The calculated value from this formula is approximate to the experimental result.
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Key words:
- coal water slurry /
- dispersant /
- interface property
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