水溶液の水素還元による金属の採取

アンモニヤ性硫酸コバルト溶液よりのコバルトの還元速度

抄録

The rate of reduction of ammoniacal cobalt sulfate solutions to metallic cobalt by hydrogen was studied over a hydrogen partial pressure range of 10 to 70kg/cm²and a temperature range of 150 to 225°C. Metallic cobalt was found to act as a catalyst, and linear rates of reduction were observed under the conditions where enough amount of cobalt powder was used. It was also revealed that the effects of ammonia and sulfate ion on the rate of reduction could be explained from the changes of hydrogen solubility. The rate of reduction is given by-d (Co)/dt=KSαPH₂ exp (-7, 540/RT) where S is the effective surface area of cobalt powder, a the hydrogen solubility coefficient, and PH₂ the partial pressure of hydrogen. A pcssible mechanism of the reduction process is suggested.