The alkali elution behavior of steelmaking slag in seawater was kinetically investigated and simulated under continuous flow in an open channel vessel with packed bed of steelmaking slag. Two types of steelmaking slags, viz. decarburization slag and dephosphorization slag, were used in this study. The alkali elution rate of decarburization slag was larger than that of dephosphorization slag due to larger free CaO content. The pH value for dephosphorization slag was almost the same as the seawater pH value in 3–4 days, whereas that for decarburization slag was stabilized in 3 days although the pH value was slightly larger than that of seawater. The capacity coefficients of alkali elution for dephosphorization and decarburization slags decreased together in an exponential manner with time. Based on a regression equation on the mass transfer capacity coefficient change with time, the alkali elution behavior was simulated and the calculated results agreed well with the experimental ones. The temporal pH change was predicted by changing slag surface area and seawater flow rate as a parameter. According to the simulation results for dephosphorization slag, the seawater pH value did not reach a high level in the ocean area.

中文翻译：

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海水明渠船装炼钢渣的碱溶出行为。

在带有炼钢渣填充床的明渠容器中，在连续流动下，对炼钢渣在海水中的碱溶出行为进行了动力学研究和模拟。两种炼钢渣，即。本研究中使用了脱碳渣和脱磷渣。脱碳渣的碱溶出率比脱磷渣的溶出率大，这是由于游离CaO含量较高。脱磷渣的pH值在3-4天中几乎与海水pH值相同，而脱碳渣的pH值在3天内稳定，尽管pH值略大于海水。碱洗的脱磷和脱碳渣的容量系数随时间呈指数下降。根据传质系数随时间变化的回归方程，模拟了碱洗脱行为，计算结果与实验结果吻合良好。通过改变炉渣表面积和海水流速作为参数来预测pH随时间的变化。根据脱磷渣的模拟结果，海水pH值在海域没有达到很高的水平。