In this study, the Ag and Cu evolution in the sintering dust was extracted by chlorination roasting process, and the mechanism of the process was analyzed by atomic absorption spectroscopy, X-ray fluorescence, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectrometry. In addition, in order to better understand the chlorination roasting process, the mechanism and thermodynamics of roasting reaction were analyzed. The recovery of Ag and Cu reached 99.05% and 59.32%, respectively, under the conditions of roasting temperature of 1423 K, holding time of 60 min, and the air flow rate of 400 L/h. Thermodynamic analysis showed that MgO and SiO₂ could promote the production of Cl₂ and HCl and that CuO could be chlorinated by Cl₂ at 1421 K, but it was not amenable for HCl. Compared with CuO, Ag was more easily chlorinated at high temperatures. Experimental results indicate that silver and copper can be efficiently extracted, indicating that the chlorination roasting is a promising pyrometallurgical treatment for the recycling of sintering dust.

在这项研究中，通过氯化焙烧法提取了烧结粉尘中的Ag和Cu析出物，并通过原子吸收光谱法，X射线荧光，X射线衍射，扫描电子显微镜和能谱分析了该过程的机理。色散X射线光谱法。此外，为了更好地了解氯化焙烧过程，分析了焙烧反应的机理和热力学。在焙烧温度为1423 K，保温时间为60 min，空气流量为400 L / h的条件下，Ag和Cu的回收率分别达到99.05％和59.32％。热力学分析表明，MgO和SiO ₂可以促进Cl ₂和HCl的生成，CuO可以被Cl ₂氯化。在1421 K时，但不适用于HCl。与CuO相比，Ag在高温下更容易氯化。实验结果表明，可以有效地提取银和铜，这表明氯化焙烧是一种有前景的火法冶金方法，可用于烧结粉尘的循环利用。