离子交换树脂在红土镍矿湿法冶金过程中的应用研究

Application study on the ion exchange resin in the hydrometallurgical process of laterite nickel ore

本文考察了某商用离子交换树脂吸附、解吸、再生的工艺可行性,对树脂的形貌进行了表征,并考察了树脂在红土镍矿湿法冶金过程中适合的应用位置。实验结果表明:树脂工艺可同时实现镍钴回收富集和杂质初步去除的目的;该树脂对镍的吸附容量在50~60 mg/g之间,钴7.5 mg/g左右;吸附后的树脂可用稀硫酸解吸,镍、钴的一次解吸率分别可达到70%和80%以上;经过三次解吸和三次洗涤后,镍钴总解吸率分别可达84%和91%;解吸之后,用Na OH溶液对树脂进行转型,再次用于吸附,树脂对镍钴的吸附性能可接近初始水平;在目前常见红土镍矿湿法冶金工艺中,树脂适合用于一次除铁铝工序之后。树脂工艺有望缩短现有工艺流程,减少固液分离次数。

In this paper,the process feasibility of adsorption,desorption and regeneration of a commercial ion exchange resin is investigated,the morphology of the resin is characterized,and the suitable application step of the resin in the hydrometallurgical process of laterite nickel ore is investigated. Experimental results show that the resin’application can simultaneously achieve the purpose of nickel and cobalt recovery and preliminary removal of impurities. The adsorption capacity of the resin for nickel is between 50 ~ 60 mg/g,and the cobalt is about 7. 5 mg/g. The adsorbed resin can be desorbed with dilute sulfuric acid,and the primary desorption rate of nickel and cobalt can reach 70% and 80% respectively. After three desorptions and three washings,the total desorption rates of nickel and cobalt can reach 84% and 91% respectively. After desorption,the resin is transformed with NaOH solution and used for adsorption again. The adsorption performance of the resin for nickel and cobalt can be close to the initial level. In addition,in the current common laterite-nickel ore hydrometallurgical process,the resin is suitable for use after the one-step process of removing iron and aluminum. The resin process is expected to shorten the existing process flow and reduce the number of solid-liquid separations.