阳极液提取Mn~(2+)和NH_3-N的影响因素及其分析

以阳极液作为提取剂,从电解锰渣中提取Mn2+和NH3-N,考察了液固比、反应温度和反应时间等3个因素对Mn2+和NH3-N提取效果的影响.实验结果表明,阳极液对Mn2+的提取效果明显优于对NH3-N的提取效果.Mn2+的最佳提取条件是液固比(mL/g)为10∶1,在50℃下反应30min,提取率达72.1%;NH3-N的最佳提取条件是液固比为10∶1,在50℃下反应40min,提取率达45.6%.动力学研究表明,阳极液对电解锰渣中Mn2+的提取反应符合拟一级动力学方程,而对NH3-N的提取反应符合拟二级动力学方程.

Extraction of Mn2＋ and NH3-N from Eletrolytic Manganese Slag Using Anolyte as Extractant and Its Kinetic Study

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 Mnz＋ was 72.1% which was ob- tained when the liquid-solid ratio （mL/g） was 10： 1 at 50 ℃ for 30 min. The optimum extraction effi- ciency of NH3-Nwas 45.6% which was obtained when the liquid-solid ratio was 10 ： 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.