Abstract Zinc-bearing dusts from steel plants were classified as hazardous solid waste, but are important secondary resources to extract iron and zinc through direct reduction technology. In this study, three kinds of Zinc-bearing dusts from a steel plant were made into carbon-containing pellets and reduced at 1323 K–1473 K. The results showed that the efficiency of zinc removal was controlled by the Jander three-dimensional diffusion. The mechanism of zinc removal from the pellets was analyzed by optical microscope, scanning electron microscope, energy dispersive spectrometer, X-ray diffraction and thermodynamic calculation. It was found that the zinc element in the zinc-bearing dust pellets presented in the form of zinc ferrite, hardystonite and zinc chloride. The process of the zinc removal from the pellets in direct reduction could be divided into four stages according to the efficiency of zinc removal and the microstructure of the reduced pellets.

中文翻译：

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含锌粉尘球团直接还原除锌动力学及机理研究

摘要 钢铁厂含锌粉尘属于危险固体废物，是直接还原技术提取铁、锌的重要二次资源。本研究将某钢厂的三种含锌粉尘制成含碳球团，并在 1323 K-1473 K 下还原。结果表明，Jander 三维扩散控制了除锌效率。通过光学显微镜、扫描电子显微镜、能谱仪、X射线衍射和热力学计算分析了球团锌的去除机理。发现含锌粉尘球团中的锌元素以铁酸锌、硬石和氯化锌的形式存在。