Abstract Coking coal is extensively utilized in steel manufacturing industries for the preparation of coke because of their quality of leaving very less ash after burning. The effect of chemical additive, hydrated lime (for 0.05, 0.1, 0.5, 1, 1.5, and 2% of solids mass), in coking coal and water slurry (CCWS) are examined at the mass concentrations of 20 and 25%. Significant drop in shear stress is observed after addition of hydrated lime to the CCWS. This study includes the investigation of settling characteristics, pH, and rheology of the CCWS. Settling concentration of CCWS varied for a longer duration such as up to 48 h and then became constant. Physical interaction of particles in CCWS with time found to be influencing the rheology of CCWS with time. Hence, the rheology of CCWS with and without additives is investigated for soaking time intervals of 0, 24, 28, 48 and 72 h. Rheological parameters such as flow index (n), yield stress (τ o) and flow consistency index (K) are numerically modeled and the results are found in close vicinity to the experimental values. pH of CCWS was found to be increasing with increasing concentration of calcium hydroxide in the CCWS.

中文翻译：

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含氢氧化钙添加剂的炼焦煤和水浆流变参数模型

摘要 炼焦煤因其燃烧后灰分极少而被广泛用于钢铁制造行业制备焦炭。在 20% 和 25% 的质量浓度下检查化学添加剂熟石灰（占固体质量的 0.05、0.1、0.5、1、1.5 和 2%）在炼焦煤和水浆 (CCWS) 中的影响。在 CCWS 中加入熟石灰后，观察到剪切应力显着下降。该研究包括对 CCWS 的沉降特性、pH 值和流变学的调查。CCWS 的沉降浓度在更长的时间内变化，例如长达 48 小时，然后变得恒定。发现 CCWS 中粒子随时间的物理相互作用会随时间影响 CCWS 的流变学。因此，针对 0、24、28、48 和 72 小时的浸泡时间间隔，研究了含有和不含添加剂的 CCWS 的流变性。流变参数，如流动指数 (n)、屈服应力 (τ o) 和流动一致性指数 (K) 被数值模拟，结果与实验值非常接近。发现 CCWS 的 pH 值随着 CCWS 中氢氧化钙浓度的增加而增加。