Immobilization of high concentrations of soluble Mn(II) from electrolytic manganese solid waste using inorganic chemicals

Environmental Science and Pollution Research International
Bing DuZhigang Dan

Abstract

Electrolytic manganese solid waste (EMSW) is a by-product of electrolytic manganese production and generally contains a high concentration of soluble Mn(II) (2000-3000 mg/L). Millions of tons of EMSW are stored in China, and the environmental pollution caused by manganese in this waste product is concerning. Unfortunately, little attention has been paid to the immobilization of manganese from industrial solid waste because manganese is absent from toxicological identification standards, and there is a lack of relevant quality standards in China. The objectives of this study were to immobilize soluble Mn(II) using chemical reagents, to analyze the immobilization mechanism, and to identify the most economical reagents. We investigated the immobilization degrees of soluble Mn(II) achieved by the reagents quicklime (CaO), carbonates (NaHCO₃ and Na₂CO₃), phosphates (Na₃PO₄, Na₂HPO₄, NH₄H₂PO₄, and Ca₁₀(PO₄)₆(OH)₂), and caustic magnesia (MgO) both individually and in combination. Our results showed that the use of 9% CaO+ 5% NaHCO₃, 9% CaO+ 5% Na₃PO₄, 10% MgO alone, or with 1-5% NaHCO₃ or 1-5% Na₂CO₃ can reduce the amount of Mn(II) leached to 100 mg/kg when the eluate pH was in the range of 6-9. The most economical reagent treatments ...Continue Reading

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Citations

Mar 17, 2016·Environmental Science and Pollution Research International·Hongliang ChenChangyuan Tao
Aug 17, 2016·Environmental Science and Pollution Research International·Bing DuNing Duan
Sep 21, 2016·Environmental Science and Pollution Research International·Bing DuNing Duan

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