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.
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