Cooperative removal of Mn²⁺, NH₄⁺−N, PO₄³⁻−P and F⁻ from electrolytic manganese residue leachate and phosphogypsum leachate

Abstract

Electrolytic manganese residue leachate (EMRL) contains plenty of Mn²⁺ and NH₄⁺−N, and phosphogypsum leachate (PGL) contains large amounts of PO₄³⁻−P and F⁻. Traditional methods of EMRL and PGL discharge could seriously damage the ecological environment. In this study, an innovative method for cooperative removal Mn²⁺, NH₄⁺−N, PO₄³⁻−P, F⁻ from PG and POFT was studied. The result showed that Mn²⁺, PO₄³⁻−P and F⁻ were mainly removed in forms of Mg₃Si₄O₁₀(OH)₂, Mn₃O₄, Mn₃(PO₄)₂, Mg₃(PO₄)₂, CaSO₄·2H₂O, MnF₂, MnOOH and Ca₂P₂O₇·2H₂O, when LG−MgO was used to adjust the pH value of the system to 9.5, and the volume ratio of EMRL and PGL was 1:4, as well as reaction for 1 h at 25 °c. NH₄⁺−N was mainly removed by struvite precipitate, when the molar ratio of N:Mg:P was 1:3:2.4. The concentrations of Mn²⁺, NH₄⁺−N and F⁻ were lower than the integrated wastewater discharge standard. The concentration of PO₄³⁻−P decreased from 254.20 mg/L to 3.21 mg/L. This study provided a new method for EMRL and PGL cooperative harmless treatment.

Keywords

electrolytic manganese residue leachate / phosphogypsum leachate / low-grade MgO / cooperative removal

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