Zinc fuming processes are used to volatilize heavy metals from slags and produce a clean slag. Since alternative fuel sources containing plastics are explored, the effect of chlorides becomes relevant. In this paper, the influence of Cl additions to a zinc fuming process on the Zn volatilization is investigated. Thermodynamic calculations were carried out on available industrial data from three different installations. The effects on the fuming performance of the α-value (mol O₂/ mol C, in a range of 0.5 to 0.75), chloride source (Cl₂, KCl, NaCl, MgCl₂, and CaCl₂), and added chloride amounts (50, 150, and 500 ppm Cl/min) were investigated. Although the α-value is still the most influential parameter for the overall zinc fuming rate, chloride additions can have positive effects as well. They make ZnCl₂ volatilization possible, which supplements the Zn volatilization. Large additions of CaCl₂ and MgCl₂ improve the fuming rate the most since they cause the largest formation of the volatile ZnCl₂ and they do not negatively influence Zn volatilization.

中文翻译：

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现有锌发烟过程中添加氯的热力学研究

锌熏制工艺用于使炉渣中的重金属挥发并产生干净的炉渣。由于已经探索了包含塑料的替代燃料源，因此氯化物的作用变得很重要。在本文中，研究了添加Cl对锌发烟过程对Zn挥发的影响。根据来自三个不同装置的可用工业数据进行了热力学计算。对α值（mol O ₂ / mol C，范围在0.5到0.75之间），氯化物源（Cl ₂，KCl，NaCl，MgCl ₂和CaCl ₂）以及添加的氯化物量的发烟性能的影响（50、150和500 ppm Cl / min）进行了研究。虽然α值仍然是总锌发烟率最有影响力的参数，氯化物的添加也会产生积极影响。它们使ZnCl ₂挥发成为可能，从而补充了Zn挥发。大量添加CaCl ₂和MgCl _{2可以最大程度地}提高发烟率，因为它们会引起挥发性ZnCl ₂的最大形成，并且不会对Zn挥发产生负面影响。