Abstract: Extraction of Mn²⁺ and NH₃-N from electrolytic manganese slag with anolyte as extractant was studied.The influence of liquid-solid ratio,extraction time,temperature on the extraction efficiency of Mn²⁺ and NH₃-N was investigated.Results indicated that the extraction efficiency of Mn²⁺ with anolyte was better than that of NH₃-N.The optimum extraction efficiency of Mn²⁺ was 72.1% which was obtained when the liquid-solid ratio (mL/g) was 10∶1 at 50 ℃ for 30 min.The optimum extraction efficiency of NH₃-N 45.6% which was obtained when the liquid-solid ratio was 10∶1 at 50 ℃ for 40 min.Kinetic study suggests that the extraction of Mn²⁺ from electrolytic manganese slag with anolyte as extractant accords with pseudo first-order kinetics equation,while that of NH₃-N agrees well with pseudo second-order kinetics equation.

Key words: eletrolytic manganese slag, Mn^2+, NH₃-N, anolyte, kinetic