Iron Enhanced Elimination of Manganese Dithionate by MnO2 and Its Operating Conditions

doi:10.12068/j.issn.1005-3026.2022.10.018

Abstract

Abstract: Manganese ore slurry flue gas desulfurization will produce the by-product manganese dithionate(MnS₂O₆)， and the presence of dithionate greatly affects the resource utilization of manganese in the desulfurization solution. A new process for iron-enhanced MnS₂O₆ elimination by MnO₂ is proposed based on the composition of most manganese ore. The results show that the addition of Fe(III)has a good promotion effect on the elimination of dithionite by MnO₂. The degradation efficiency gradually increases with the increase of Fe(III)， and the best degradation efficiency can reach 55.1% at 5g·L^-1 of H₂SO₄. The optimum operation conditions obtained are 90℃ reaction temperature， 5g·L^-1 of H₂SO₄， 15g·L^-1 of Fe(III)addition， n(S₂O^2-₆)∶ n(MnO₂)=1∶20 and 3h duration time.

Key words: flue gas; manganese oxide ore; desulfurization; Fe(III); manganese dithionate(MnS₂O₆)

CLC Number:

X701.3

ZHANG Shao-yu， PU Peng-yan， JIANG Wen-ju， YANG Lin. Iron Enhanced Elimination of Manganese Dithionate by MnO₂ and Its Operating Conditions[J]. Journal of Northeastern University(Natural Science), 2022, 43(10): 1499-1505.

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Iron Enhanced Elimination of Manganese Dithionate by MnO₂ and Its Operating Conditions

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