Abstract Sludge from coal chemical industry is hazardous and difficult to disposal. In this study, a coal chemical sludge was mixed with lignite, coking coal and lean coal to prepare coal-sludge-slurry(CSS) for gasification and combustion. The results showed that the addition of sludge changed CSS from the dilatant fluid to the yield pseudo-plastic fluid. The stability of CSS was observed increasing, while the preparation concentration was decreased at the same viscosity requirement. A combination of BET analysis and EDLVO theory calculation was carried out to study the behavior among particles and water in CSS. Sludge could attract considerable water, increasing the viscosity of slurry. Besides, sludge might connect with coal particles to structure a three-dimensional network which would be destroyed by agitation and then released trapped water, resulting in the pseudo-plasticity of CSS. The network could also prevent the aggregation of particles and improve the stability of slurry.

中文翻译：

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煤化工污泥制备煤泥浆性能研究

摘要 煤化工生产的污泥危害性大，处理难度大。在本研究中，煤化工污泥与褐煤、炼焦煤和贫煤混合制备煤-污泥-泥浆（CSS）用于气化和燃烧。结果表明，污泥的加入使CSS从膨胀流体变为屈服假塑性流体。观察到 CSS 的稳定性增加，而在相同的粘度要求下，制剂浓度降低。结合 BET 分析和 EDLVO 理论计算，研究了 CSS 中粒子和水之间的行为。污泥会吸引大量的水，从而增加浆液的粘度。此外，污泥可能与煤颗粒连接形成三维网络，被搅拌破坏，然后释放出截留的水，导致 CSS 的伪可塑性。网络还可以防止颗粒聚集，提高浆液的稳定性。