Korean Chemical Engineering Research

  • 제53권4호
  • /
  • Pages.509-516
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  • 2015
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  • 0304-128X(pISSN)
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  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
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Reduction Leaching of Manganese Dioxide Ore Using Black Locust as Reductant in Sulfuric Acid Solution

  • Xue, Jianrong (College of Chemistry and Chemical Engineering, Central South University) ;
  • Zhong, Hong (College of Chemistry and Chemical Engineering, Central South University) ;
  • Wang, Shuai (College of Chemistry and Chemical Engineering, Central South University) ;
  • Li, Changxin (College of Chemistry and Chemical Engineering, Central South University) ;
  • Li, Jinzhong (College of Chemistry and Chemical Engineering, Central South University) ;
  • Wu, Fangfang (College of Chemistry and Chemical Engineering, Central South University)
  • 투고 : 2014.10.14
  • 심사 : 2015.02.12
  • 발행 : 2015.08.01
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초록

We investigated the reduction leaching process of manganese dioxide ore using black locust as reductant in sulfuric acid solution. The effect of parameters on the leaching efficiency of manganese was the primary focus. Experimental results indicate that manganese leaching efficiency of 97.57% was achieved under the optimal conditions: weight ratio of black locust to manganese dioxide ore (WT) of 4:10, ore particle size of $63{\mu}m$, $1.7mol{\cdot}L^{-1}\;H_2SO_4$, liquid to solid ratio (L/S) of 5:1, leaching time of 8 h, leaching temperature of 368 K and agitation rate of $400r{\cdot}min^{-1}$. The leaching rate of manganese, based on the shrinking core model, was found to be controlled by inner diffusion through the ash/inert layer composed of associated minerals. The activation energy of reductive leaching is $17.81kJ{\cdot}mol^{-1}$. To conclude the reaction mechanism, XRD analysis of leached ore residue indicates manganese compounds disappear; FTIR characterization of leached residue of black locust sawdust shows hemicellulose and cellulose disappear after the leaching process.

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