Sustainable Mining and Metallurgy

In this paper, the three-stage jarosite leaching process was proposed based on the economy and environmental protection of the harmless treatment of zinc leaching residue in rotary kiln equipped with zinc hydrometallurgy leaching process. The quality of the supernatant produced by the process and the change of Fe²⁺, Fe³⁺, H⁺ and other contents in the process control were investigated. The characteristics of the economic and technical indicators of the process, such as zinc leaching rate, slag rate, zinc content in slag, were studied. The advantages of supporting rotary kilns in harmless treatment of zinc leaching slag were analyzed. According to the production practice, the quality of the medium and supernatant produced by the three-stage potassium jarosite process is similar to that produced by the conventional method and potassium jarosite, which can meet the requirements of the purification process of zinc hydrometallurgy. The zinc leaching rate of the three-stage potassium jarosite process is 94.67%, the residue rate is 37.27%, the zinc content and sulfur content of the residue are about 8% and 10% respectively, and the liquid-solid separation effect is good. The three-stage potassium jarosite leaching process has the advantages of short process, low energy consumption, low residue rate, moderate zinc content and low sulfur content in the leached residue, which is suitable for the harmless treatment of rotary kiln.