助滤剂对电解锰渣的助滤作用研究

Study on the Effect of Filter Aid Agent on Electrolytic Manganese Slag

针对锰渣滤饼含水率高的问题,通过在酸性浸出液中加入助滤剂来解决.通过酸性浸出液中锰渣的粒度,润湿性分析,发现锰渣粒度细和表面呈亲水性导致含水率高.根据锰渣的主要成分SiO_2和接触角试验,最后确定油酸酰胺、十八胺和十二胺作为助滤剂进行抽滤试验.结果表明:油酸酰胺对降低锰渣滤饼的含水率效果不佳,十八胺和十二胺效果显著.建立十八胺和十二胺用量对含水率作用的回归方程,确定十八胺用量为2 514.47 g·m^(-3)时,含水率最低为36.10%,十二胺用量为1 894.57 g·m^(-3)时,含水率最低为34.09%.因此,确定十二胺为锰渣的助滤剂.

The problem that manganese-slag filter cake possessed high water content was solved by adding filter aid agent into acidic leaching solution. After the analysis of the particle size and wettability of manganese slag in acidic leaching solution, it was found that high water content resulted from the fact that manganese slag particle was small in size and its surface was hydrophilic. As the main component of manganese slag was SiO2, oleamide, octadecylamine and dodecylamine were selected as filter aid agent to implement the leaching experiment based on contact angle test. The results suggested that octadecylamine and dodecylamine did well in reducing water content in manganese-slag filter cake and oleamide was not. Established were regression equations on how the amount of octadecylamine or dodecylamine exerted effect on water content. It was therefore calculated that the water content of manganese-slag filter cake reached the lowest （36. 10%） when the amount of octadecylamine was 2 514.47 g·m^-3; in contrast,its water content reached the lowest（34.09%） when the amount of dodecylamine was 1 894.57 g·m^-3. Dodecylamine was therefore identified the most appropriate filter aid agent for manganese slag.