Leaching Kinetics of MnO2 from Electrolytic Manganese Anode Slimes in the Presence of SO2

Ying Fen Li; Hua Ye; Can Cao; Li Na He

doi:10.4028/www.scientific.net/AMR.233-235.532

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 233-235Leaching Kinetics of MnO2 from Electrolytic...

Leaching Kinetics of MnO₂ from Electrolytic Manganese Anode Slimes in the Presence of SO₂

Abstract:

Thepaper describes the kinetics of MnO₂ from electrolytic manganese (EM) anode slimesleached by SO₂.The effects of stirring speed,SO₂ concentration,temperature, and partical size on the leaching rate of manganese are discussed. Experimental results indicated that the leaching of MnO₂ by SO₂ is 0.86 order with respect to SO₂ concentration. The apparent activation energy values for re-action is 25.7KJ/mol,which is consist with the values of activation energy for diffusion control. The kinetic equation can be expressed as: 1-(2/3)x-(1-x)^2/3=(k₁/ρr){[SO₂]^0.86exp(-25700/RT)}t. Meanw-hile, comparative experiments were operated, using analytical class MnO₂ and pyrolusite, the differ-ence among the three MnO₂ simples reaction with SO₂ was identified.

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Periodical:

Advanced Materials Research (Volumes 233-235)

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532-536

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.233-235.532

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Online since:

May 2011

Authors:

Ying Fen Li, Hua Ye, Can Cao, Li Na He

Keywords:

Diffusion Control, Electrolytic Manganese Anode Slime, MnO₂, SO₂

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