Chlorine is generated during iron ore sintering, mostly in the form of alkali chlorides and primarily accumulates in sintering dust, which must be removed before reusing. In this study, an in-situ monitor leaching system based was designed to detect chloride ion water leaching behaviors in real-time and improve the understanding of chlorine dissolution kinetic behaviors in water. Various parameters, including water leaching temperature, solid/liquid ratio, stirring speed, particle size and surfactant addition have been studied. Meanwhile their chlorine dissolution data exhibited a good fit to Stumm’s kinetic models. The results of kinetics analysis and transition state theory calculation on apparent activation energy demonstrated that the dissolution process was controlled by diffusion at low S/L ratio, while changed to be controlled by surface chemical reaction as the S/L ratio increased. Furthermore, increasing both temperature and stirring speed improved the chlorine removal speed. Moreover, reducing the particle size and adding 0.2% nonionic surfactant Triton X-100 reduced the surface energy and accelerated surface chemical reaction, which were also beneficial for removing chlorine from sintering dust. In addition, the SEM-EDS examination inferred that the existence of laurionite (PbOHCl) limited the chlorine dissolution rate to less than 97%, while beneficiation or hydrometallurgy treatment was needed to further remove chlorine.

中文翻译：

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铁矿石烧结粉尘中氯的溶解动力学

氯在铁矿石烧结过程中产生，主要以碱金属氯化物的形式存在，主要积聚在烧结粉尘中，必须在重新使用前去除。在本研究中，设计了一种基于原位监测浸出系统的实时检测氯离子水浸出行为，提高对水中氯溶解动力学行为的理解。已经研究了各种参数，包括水浸温度、固液比、搅拌速度、粒度和表面活性剂添加。同时，他们的氯溶解数据与 Stumm 的动力学模型非常吻合。表观活化能的动力学分析和过渡态理论计算结果表明，在低 S/L 比下，溶解过程受扩散控制，而随着 S/L 比的增加，变为受表面化学反应控制。此外，提高温度和搅拌速度提高了除氯速度。此外，减小粒径和添加0.2%的非离子表面活性剂Triton X-100降低了表面能，加速了表面化学反应，这也有利于去除烧结粉尘中的氯。此外，SEM-EDS检测推断月桂石（PbOHCl）的存在将氯的溶解率限制在97%以下，而需要进行选矿或湿法冶金处理以进一步去除氯。2%的非离子表面活性剂Triton X-100降低了表面能，加速了表面化学反应，也有利于去除烧结粉尘中的氯。此外，SEM-EDS检测推断月桂石（PbOHCl）的存在将氯的溶解率限制在97%以下，而需要进行选矿或湿法冶金处理以进一步去除氯。2%的非离子表面活性剂Triton X-100降低了表面能，加速了表面化学反应，也有利于去除烧结粉尘中的氯。此外，SEM-EDS检测推断月桂石（PbOHCl）的存在将氯的溶解率限制在97%以下，而需要进行选矿或湿法冶金处理以进一步去除氯。