为了研究不同水(去离子水、自来水、选煤厂补加清水、选煤厂循环水)硬度对煤泥浮选效果的影响,利用Powereach JC 2000D1接触角测量仪、JS94型微电泳仪等分析了煤泥在不同硬度水介质中的润湿接触角及ζ-电位变化,并开展了分步释放浮选对比试验.结果表明:生产实践中的浮选用水的硬度差异非常大,随着浮选用水硬度的增大,煤泥颗粒表面的-OH含量增加、润湿性增强、疏水性降低,使煤泥颗粒的接触角减小;水硬度的升高会压缩煤粒周围双电层,使颗粒在水中的ζ-电位降低,气泡与煤颗粒间的水化层易于破裂,煤颗粒与气泡接触的难度降低.在相同条件下,采用较高硬度的水调浆时所获得的精矿产率、可燃体回收率均高于使用较低硬度的水.%In order to study different water (deionized water,tap water;refilling water from the coal preparation plant and circulated water of the coal preparation plant) hardness affected to the slime floatation effect,Powereach JC 2000D1 contact angles measuring apparatus and JS94 mode microelectrophoresis apparatus and others were applied to analyze the wetting contact angle of the slime in different hardness water medium and the variation of ζ-potential and then the comparison experiment of the stage released flotation was conducted.The results showed that in the production practices,water hardness of the floatation would be high different.With the water hardness of the floatation increased,the-OH content on the particle surface of the slime increased,the wettability increased and hydrophobicity decreased,the particle contact angles of the slime would be reduced.The water hardness increased would compress the double electric layers around the coal particles,the ζ-potential of the particles in water would be reduced,the bubbles and the hydrated layers between the coal particles would be easily broken.The contact difficulty between the coal particles and bubbles would be reduced.Under the same condition,when the slurry mixed with high hardness water,the clean mineral production rate and the combustible material recovered rate would be higher than the slurry with low hardness water.
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