旋转圆盘法研究锌片置换除钴的影响因素

EFFECT FACTORS OF COBALT REMOVAL USING ZINC CEMENTATION BY ROTATING DISC GEOMETRY

研究了锌离子、搅拌速度、溶液ｐＨ以及温度等对锌片置换除钴的影响因素．结果表明，锌离子对锌粉净化除钻影响较大，当硫酸钴溶液中不含锌离子时，锌粉置换除钻较易进行；相反，当硫酸钴溶液中含锌离子时，锌粉置换除钻较难进行。当硫酸锌溶液温度低于７５℃时．锌片置换除钴的速率较低；随溶液 ｐＨ值的降低，除钴效率升高，但如果溶液ｐＨ值太低，锌粉耗量太大，导致生产成本增加。故在工业生产中，溶液ｐＨ值应保持在３．８～４．５之间。

Effects of zinc ions, agitation rate, pH values and temperatures of zinc sulphate solutions on cobalt removal by zinc cernentation have been studied. Results show that for ions have a considerable effect on cobalt removal using for powder. It is easy to remove cobalt by cementation using zinc powder when there are not any zinc ions in cobalt sulphate solutions. On the contrary, it is hard to remove cobalt from cobalt sulphate solutions containing zinc ions. Rate of cobalt removal using zinc power decreases when the temperature of zinc sulphate solutions is below 75℃. Rate of cobalt removal increases when pH valuses of the solutions decrease, however, the depletion of zinc powder increases if the pH values of solutions are very low. In this way, the cost of production is raised. So the pH value of zinc sulphate solutions must be kept 3.8-4.5