钴镉溶液中树脂深度除镉技术研究

Study on Deep Removal of Cadmium from Resin in Cobalt-cadmium Solution

本文主要研究钴镉溶液中树脂吸附法深度除镉,并将钴资源化回用。研究发现在小试最优条件下,D201树脂吸附出水中钴浓度不变,镉的浓度小于0.7 mg/L,可达到资源化回收标准。树脂吸附饱和后,可采用水作为再生剂进行解吸再生,树脂的再生率可达92%以上。在中试放大试验中,以同样的参数连续吸脱附运行15批次,树脂出水以及脱附均稳定。树脂吸附法深度除镉,不仅可以资源化回收,而且脱附无污染产生,实现环境效益和经济效益的双丰收。

This paper mainly studies the deep removal of cadmium by resin adsorption in cobalt-cadmium solution and the recycling of cobalt.The study found that under the optimal conditions of small-scale test,the concentration of cobalt remained unchanged,and the concentration of cadmium was less than 0.7 mg/L after adsorption by D201 resin,which could meet the recycling standard.When the resin is saturated,water can be used as regeneration agent for desorption and regeneration,and the desorption rate of resin can reach more than 92%.In the pilot scale-up test,15 batches of continuous adsorption and desorption were operated with the same parameters,and the resin effluent and desorption were stable.The deep removal of cadmium by resin adsorption method can not only be recycled as resources,but also cause no pollution in desorption solution,realizing the double harvest of environmental and economic benefits.