高硬度水对煤泥浮选效果的影响

发布时间：2018-04-02 23:25

本文选题：煤泥浮选　切入点：水质硬度　出处：《煤炭科学技术》2016年12期

【摘要】：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。
[Abstract]:In order to study the effect of hardness of different water (deionized water, tap water, coal preparation plant plus clean water, circulating water of coal preparation plant) on the flotation effect of coal slime,The wetting contact angle and 味-potential of coal slime in different hardness water medium were analyzed by using Powereach JC 2000D1 contact angle measuring instrument and so on.The results show that the hardness of flotation water varies greatly in production practice. With the increase of the hardness of flotation water, the content of -OH on the surface of coal slime particles increases, the wettability increases, the hydrophobicity decreases, and the contact angle of coal slime particles decreases.The increase of water hardness will compress the double electric layer around the coal particle, reduce the 味-potential of the particle in the water, the hydration layer between the bubble and the coal particle is easy to break down, and the difficulty of contact between the coal particle and the bubble is reduced.Under the same conditions, the recovery rate of combustible is higher than that of water with lower hardness.
【作者单位】：中国矿业大学化工学院;中国矿业大学低碳能源研究院;江苏省煤基CO2捕集与地质储存重点实验室;
【基金】：国家自然科学基金资助项目(51174204)
【分类号】：TD94

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