用MnO_2脱除工业铝酸钠溶液中S^(2-)的研究

A study on removal of S^(2-) from industrial sodium aluminate solution with MnO_2

采用氧化铝生产中的循环母液调配液对不同含硫量的铝土矿进行溶出,来研究赤泥自身净化除硫的能力,并在溶出过程中添加MnO2作为氧化剂,对工业铝酸钠溶液中的硫进行氧化脱除,通过实验考察MnO2添加量和氧化时间对脱硫效果及脱硫产物的影响。实验证明,赤泥对工业铝酸钠溶液具有一定的除硫的能力;在溶出过程中添加MnO2,能有效氧化溶液中的含硫离子。S2-经过S2O32-、SO23-的形态转化,最终被氧化成为SO24-。MnO2的添加量不同,其还原产物也不同,MnO2不足量时,还原产物为Mn(OH)2和Mn3O4;MnO2过量时,还原产物为Mn3O4。

In this paper the removal of S2-from sulfur-containing bauxite with adjusted circulating spent liquor was studied.Manganese dioxide is added as oxidant to remove S2-in digestion process.Effects of reaction time and amount of manganese dioxide are investigated.The research results show that red mud has some purifying capacity.Adding manganese dioxide in digestion process can remove S2-efficiently.In this process,S2-is transformed into S2O2-、SO2-3,and converted into SO2-4 finally.With different amount of MnO2 addition,the reduction products are not the same.When MnO2 is not enough,the final reduction products are Mn（OH）2 and Mn3O4,Otherwise,the reduction products is only Mn3O4.