Abstract
With the increase of zinc resource consumption, the recovery and utilization of zinc resources in zinc suboxide has become one of the current research hotspots. In this study, the electrochemical method was used to remove the impurities in the zinc leaching night and enrich the zinc ferrite in the ammonia leaching residue for the solution and ammonia leaching slag after the ammonia leaching of zinc hypoxide, in order to realize the comprehensive utilization of the essence of zinc immersion night and new resources. The results showed that the reduction potentials of copper, lead, cadmium, and zinc in the ammonia leaching solution were analyzed by electrochemical testing methods to be −0.76 V, −0.82 V, −0.94 V, and −1.3 V, respectively. Through constant potential electrodeposition, the removal rate of copper, lead, cadmium. The removal rate of cadmium is 98.73%, and the removal rate of lead and copper is more than 99%. The purified ammonia leaching solution is evaporated at 90 °C for 25 min to obtain basic zinc carbonate. The purity of ZnO obtained after calcination at 500 °C for 120 min is 96.31%. The ammonia leaching residue was pickled with 3 mol·L−1 acetic acid for 30 min to effectively remove PbCO3, and then magnetic separation was carried out with a current intensity of 1.4 A. The final zinc ferrite content was 83.83%.
Highlights
The treatment of zinc hypoxide is usually carried out by a wet process
The chemical properties of zinc ferrite are stable during the leaching process, zinc ferrite will not react with the ammonia leaching solution but will enter the ammonia leaching residue, thereby reducing the zinc leaching rate [8,9]
The ammonia leaching solution obtained after ammonia leaching can be purified to remove impurities, evaporating ammonia, and calcined to prepare zinc oxide
Summary
The treatment of zinc hypoxide is usually carried out by a wet process. There is a big gap in the composition and zinc content of zinc hypoxide from different sources.in the process of studying zinc oxide, it is necessary to adjust and change the experimental program according to the actual analysis results and to carry out targeted treatment. According to the different leaching agents, the treatment process of zinc hypoxide is usually divided into acid leaching method [1,2], alkaline leaching method [3,4], and ammonia leaching method [5,6,7]. In the ammonia leaching process, zinc oxide exists in the form of zinc–ammonia complexes, and elements such as lead, cadmium, copper and ammonia will enter the ammonia leaching solution in the form of complexes with ammonia. Elements such as magnesium, aluminum, manganese, silicon, and arsenic will not react with the leaching agent and will not enter the ammonia leaching slag; there will be zinc ferrite in zinc hypoxide. The chemical properties of zinc ferrite are stable during the leaching process, zinc ferrite will not react with the ammonia leaching solution but will enter the ammonia leaching residue, thereby reducing the zinc leaching rate [8,9]
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