Recovery and Purification of Zinc and Cadmium from Dust of Side Blowing-fuming Process for Treating Jarosites
Zinc and cadmium were recovered by acid leaching-vulcanization impurity removal method from dust of slide blowing-fuming process for treating jarosites,and copper was selectively removed from the leaching solution by sulfide precipitation.Subsequently,the obtained purified solution will be used to prepare Cd-doped ZnS composites.Based on the thermodynamic analysis,the influencing factors and kinetics of zinc leaching rate in sulfuric acid system were investigated,and the influence of various parameters on sulfidation was elucidated through orthogonal tests.The results show that the zinc in dust mainly exists in the form of zinc oxide,the leaching reaction follows a mixed control model with a 73.70 kJ/mol activation energy.Zinc leaching rate can reach 98.99％under the optimum conditions.The copper removal rate can reach 95.97％under 3.2 theoretical times of Na2S addition at pH of 2.0,with high retaining rate of Zn and Cd,achieving effectively selective separation of copper from zinc and cadmium.
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