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

近年来，从资源有效利用和环境和谐的角度出发，人们认识到含金属废旧产品的回收利用是一个重要问题。对稀有金属回收工艺的发展提出了很高的要求。在这个项目中，构建了一个过渡金属配合物溶液中增强金属溶解的浸出过程。硝酸铁溶液专门用作电子传递介质。在转速为0 ~ 3000转/分、温度为10 ~ 105℃的条件下，研究了金属镍板在硝酸铁水溶液中的溶解速率。结果表明，在影响溶解速率的诸多因素中，Fe （III）浓度的作用最为重要。随着温度和Fe （III）浓度的升高，镍的溶解速率显著提高。在最佳铁浓度下，它比不含铁的硝酸大约24倍。将该工艺应用于电池、废催化剂等的实际处理，取得了良好的效果，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.