Development and application for waste materials of enhanced leaching of nickel with transition metal complex as a catalyst

近年来，从资源的有效利用和环境和谐的观点来看，含金属的旧产品的回收被认为是重要的问题。对稀有金属回收工艺的发展提出了很高的要求。本课题研究了在过渡金属络合物溶液中强化金属溶解的浸出工艺。硝酸铁溶液专门用作电子传递介体。在转速0-3000 rpm、温度10-105 ℃条件下，研究了金属镍在硝酸铁溶液中的溶解速率，发现在影响溶解速率的各种因素中，Fe（III）浓度起着最重要的作用。镍的溶解速率随温度和Fe（III）浓度的增加而显著增加。在最佳铁浓度下，它比不含铁的硝酸大约24倍。该工艺在处理电池、废催化剂等方面的实际应用表明，效果良好，浸出率很高。

Recently, the recycling of metal containing used products is recognized to be important issue from the view point of an effective utilization of resources and an environmental harmony. The development of recycling processes of rare metals is highly demanded. In this project, a leaching process of enhanced dissolution of metals in the transition metal complex solution has been constracted. The nitric iron solution was specially used as an electron transfer mediator. The dissolution rate of metallic nickel plate in aqueous nitric iron solutions was studied at rotation speed of 0-3000 rpm and the temperature of 10-105 degree C.It was found that, among various factors that affect the dissolution rate, Fe (III) concentrationplays most important role. The dissolution rate of nickel significantly increased with an increase in the temperature and in Fe (III) concentration. With an optimum iron concentration, it was about twenty-forth times larger than that of nitricacid without iron. The practical application of this process to the treatment of batteries, used catalyst, etc. showed successful result with very high leaching rate.