锰电解返回液结晶沉淀问题研究

RESEARCH ON CRYSTALLIZED PRECIPITATION FROM THE RETURN MANGANESE ELECTROLYTE

采用化学分析的方法确定锰电解返回液输送管道中结晶沉淀物的主要成分是六水铵镁矾复盐((NH_4)_2Mg(SO_4)_2·6H_2O)。实验得到温度对锰电解返回液结晶析出的影响关系曲线为C_T=0.017T+1.28。为避免冬季生产发生结晶沉淀堵塞管道的问题,硫酸镁与硫酸铵浓度之和不应超过1.45 mol/L。根据(NH_4)_2SO_4与MgSO_4可形成不同Mg^(2+)/2NH_4^+比的两种复盐的原理,探索了高温浓缩结晶分离Mg^(2+)离子的方法,110℃结晶析出物中镁铵比为1.02,高于结晶前溶液中的镁铵比0.92。

This paper used the chemical analysis method to determine the main components of the crystallized precipitation from the return manganese electrolyte in the pipeline and concluded that it was boussingaultite （（NH4）2Mg （SO4）2·6H2O）. The curve of the influence of temperature on the separation by crystallization from the return manganese electrolyte was got by experiment. It was that CT=0.018 T＋1.28. In order to avoid the pipeline blockage caused by crystallized precipitation in winter, the sum of the concentration of magnesium sulfate and ammonium sulfate should not exceed 1.45 mol/L. According to the principle that （NH4）2SO4 and MgSO4 could form two different double salts which are different from the ratio of Mg2＋/2NH4＋, probed the method that high-temperature concentration crystal separated Mg2＋ ions. The ratio of the concentration of magnesium sulfate and ammonium sulfate increased from 0.92 in the original solution to 1.02 in the crystallized precipitation at 110 ℃.