在常压及不同O_2-N_2气相组成下,曾对Cu在氨性溶液中的溶解动力学进行了研究. 溶解系电化学反应过程,溶解速度为阴极过程控制时,控制因数是氧的传递;为阳极过程控制时,控制因数是NH_4~+的扩散及NH_3的化学反应速度. 实验结果得到了溶解速度随时间变化——加速或减慢的判据,并对自催化加速作用的条件及范围进行了研究.
Studies on the kinetics of copper dissolution in aqueous ammoniacal solutionsaturated with oxygen-nitrogen mixtures of different composition under ambientpressure have been carried out. The reaction of copper dissolution is electrochemi-cal in nature. When the rate of dissolution is limited by the cathodic reaction,the transfer of oxygen is a controlling factor. On the contrary, when the processis limited by the anodic reaction, the reaction will be controlled by the rate ofammonium ion diffusion as well as by the chemical reaction rate with ammo-nia. Criteria for the rate of dissolution of copper will rise or fall with timehave been found. Conditions for the autocatalytic reaction to take place havealso been investigated.
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