Analysis of Leaching Behavior and Kinetics of Manganese in Electrolytic Manganese Residue
The leaching of manganese from electrolytic manganese residue with sulfuric acid was studied,and the process parameters were optimized by single factor test and orthogonal test.The phase,structure,morphology and leaching kinetics of electrolytic manganese residue before and after leaching were analyzed.The leaching model was established and the leaching mechanism was explored.The results show that under the optimal conditions of particle size of 200 mesh,stirring speed of 400 r/min,leaching temperature of 95 ℃,sulfuric acid concentration of 1.5 mol/L,leaching time of 120 min and liquid volume/solid mass ratio of 11/1,the leaching rate of Mn can reach 97.90％.Manganese leaching kinetics accords with the liquid-solid shrinkage model and is controlled by chemical reaction.In the process of manganese leaching,the leaching rate of Mn can be improved by controlling the liquid volume/solid mass ratio and temperature.
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