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本文用具有一定几何形状的转盘研究了金属锌从硫酸锌溶液中沉淀钴和砷的动力学。 该反应受表面化学阶段的速度控制。为得到适宜的反应速度,温度必须达到365K。当温度低于365K时,总反应为: 2HAsO_2+2Co~(2+)+6H~++5Zn=2CoAs+5Zn~(2+)+4H_2O而在较高温度时,总反应为: 2HAsO_2+Co~(2+)+6H~++4Zn=CoAs_2+4Zn~(2+)+4H_2O上述两种反应均消耗氢离子,如果不控制溶液的pH值,则碱式硫酸锌开始在沉淀剂表面形成,使反应速度下降。 溶液中即使存在很少量的氧,对置换沉淀反应也有显著的阻滞作用,因此应当排除置换沉淀反应器中的氧。
In this paper, the kinetics of precipitation of cobalt and arsenic from zinc sulfate solution was studied by using a turntable with a certain geometry. The reaction is controlled by the speed of the surface chemistry phase. In order to get a suitable reaction speed, the temperature must reach 365K. When the temperature is below 365K, the total reaction is: 2HAsO 2 + 2Co ~ (2 +) + 6H ~ + + 5Zn = 2CoAs + 5Zn ~ (2 +) + 4H_2O and at higher temperature, the total reaction is 2HAsO_2 + Co ~ (2 +) + 6H ~ + + 4Zn = CoAs_2 + 4Zn ~ (2 +) + 4H_2O Hydrogen ions are consumed by both of the above two reactions. If the pH of the solution is not controlled, basic zinc sulfate begins to form on the surface of the precipitating agent , So that the reaction rate decreased. Even in the presence of very small amounts of oxygen in the solution, there is a significant retardation effect on the metathesis reaction so that the oxygen in the displacement settling reactor should be excluded.