The effects of excess coefficient of manganese fluoride,pH value of solution,reaction temperature and reaction time on the removal rate of calcium and magnesium from manganese sulfate solution were studied by performing single factor experiment with manganese fluoride as a removal agent.Under the optimum conditions,including an excess coefficient of manganese fluoride of 2.0,pH of 5,reaction temperature of 85 ℃ and reaction time of 80 min,the removal rates of calcium and magnesium can reach 97.06％and 95.48％,respectively.The kinetic study on this basis shows that the precipitation reactions of both calcium and magnesium in manganese sulfate solution conform to the Avrami equation,with apparent activation energies of 48.01 kJ/mol and 53.23 kJ/mol,respectively.The surface reaction is a factor to limit the precipitation rates of calcium and magnesium.
关键词
硫酸锰溶液/除钙/除镁/钙镁/氟化锰/沉淀/工艺条件/动力学
Key words
manganese sulfate solution/calcium removal/magnesium removal/calcium and magnesium/manganese fluoride/precipitation/process conditions/kinetics
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