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| Effects of different reagents on the stabilization of soluble manganese from electrolytic manganese solid waste |
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Abstract In order to satisfy the requirement of economical treatment for a large quantity of solid waste, the sort of reagents, such as alkaline materials, phosphate and carbonate, were examined. The immobilization effectiveness of reagents, such as CaO, MgO, and Ca10(PO4)6(OH)2or those reagents in combination with NaHCO3, Na3PO4were investigated. Mineral composition, valence states and speciation of manganese were measured to analyze the stabilization mechanism on soluble manganese. The results showed that the stabilization efficiency of soluble manganese can reach 100% on the condition of 10% addition of magnesium oxide accounting for the mass of EMSW. The immobilization efficiency of soluble manganese could achieve 95% using 9%CaO+5%NaHCO3and 9%CaO+5%Na3PO4. Those stabilizers made the conversion of soluble manganese to precipitated manganese and parts of them to high-charged oxidation products. The addition of CaO in combination with 5%NaHCO3and 5% Na3PO4would be favorable for the transformation of Mn2+ to Mn3+ and Mn4+.
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Received: 09 September 2014
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