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Recovery of pure MnSO4∙H2O by reductive leaching of manganese from pyrolusite ore by sulfuric acid and hydrogen peroxide

International Journal of Mineral Processing
Publication Date
DOI: 10.1016/j.minpro.2011.05.003
  • Manganese Sulfate
  • Reductive Leaching
  • Manganese Ore
  • Sulfuric Acid
  • Hydrogen Peroxide
  • Chemistry


Abstract Manganese leaching and recovery from pyrolusite ore, was investigated by using H 2SO 4 as a leachant and H 2O 2 as a reducing agent. The effects of agitation, H 2O 2 concentration, H 2SO 4 concentration, liquid/solid mass ratio, leaching time and reaction temperature on manganese recovery were studied. The optimal leaching conditions were determined as 4.0 M H 2SO 4 and 0.8 M H 2O 2 using liquid–solid mass ratio of 5.0 for 90 min at 40 °C and ore particle size of 44–37 μm. Under these conditions, the leaching efficiency was 92.0% for Mn. It was found that the use of H 2O 2 as a reducing agent for the reductive leaching of manganese increased the leaching rate. Analysis of the experimental results indicted that the leaching process is fitted by a chemical reaction model in temperature range 20–40 °C, and at higher temperature, 45–70 °C, the diffusion reaction model prevails. Activation energies for these models were calculated to be 49.5 kJ∙mol − 1 and 10.6 kJ∙mol − 1 , respectively. Based on the experimental results, a separation method and flow sheet were developed and tested to separate high purity MnSO 4.H 2O (> 99.4%). Comparison between the present results and that reported in the literature are given.

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