利用钢铁厂烟灰制备高纯碳酸锰

Preparation of high-purity manganese carbonate from steel plant dust

以某钢铁厂烟灰为原料,经酸浸出、除杂、沉淀和锰盐复分解等工艺过程得到碳酸锰.通过正交试验,得到锰浸出的最佳工艺条件为:m(硫酸)∶m(烟灰)=4∶1,温度70℃,时间2 h,此时锰浸出率可达87.7%.通过单因素实验,优化了碳化条件:n((NH4)2CO3)∶n(MnSO4)=2∶1,反应温度60℃,pH=7,陈化30 min,此时碳酸锰产率可达91%,且产品质量符合GB10503—89标准.

Using steel plant dust,manganese carbonate was prepared by reaction of acid-leaching,purification,precipitation and replacement reaction.The effects of the leaching temperature,the leaching time,the mass ratio of sulfuric acid to steel dust on the leaching yield of manganese were investigated by the orthogonal test methods.The optimum leaching conditions were as follows：the mass ratio of sulfuric acid to steel dust 4∶1,the leaching temperature 70 ℃,time 2 h,the leaching yield of manganese was 87.7%.By means of single factor experiments,the optimal carbonization conditions were obtained：n（（NH4）2CO3）∶n（MnSO4）=2∶1,the reaction temperature was 60 ℃,pH=7,the aging time was 30 min,and the yield of manganese carbonate reached 91%.The prepared manganese carbonate accords with GB10503—89.