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铀矿山的废水处理,通常是采用离子交换法去除和回收水中铀,以达到保护环境与回收资源的目的。为了将吸附在树脂上的铀淋洗下来,工艺上一般采用酸性淋洗剂,如10％硫酸溶液,或pH=1的1N氯化钠溶液等。这类淋洗剂淋铀效果一般欠佳,且防腐要求苛刻。也有采用碱性淋洗剂的,如10％碳酸钠+4％碳酸氢钠溶液,或1.1M氯化钠+0.05M碳酸氢钠溶液等,但其淋洗效果也不甚理想。 为了提高铀矿山废水处理中负载铀树脂的淋铀效果,本文叙述了对多种碱性淋洗剂进行的淋铀试验,并与生产工艺上采用的几种淋洗剂进行了比较。结果表明,实验确定的这种淋洗剂能有效地将强碱性阴离子交换树脂717(或弱碱性阴离子交换树脂705)上的铀淋洗下来。试验中采用了移动床逆流淋洗装置,使淋铀效果达到比较理想的程度。
Uranium mine wastewater treatment, usually by ion exchange method to remove and recover uranium in water, in order to achieve the purpose of environmental protection and resource recovery. In order to leach the resin adsorbed on the uranium, acidic leaching agent commonly used in the process, such as 10% sulfuric acid solution, or 1N sodium chloride solution pH = 1 and so on. Rinsing agent of this kind of showering agent generally poor, and anti-corrosion demanding. There are also alkaline eluent, such as 10% sodium carbonate + 4% sodium bicarbonate solution, or 1.1M sodium chloride + 0.05M sodium bicarbonate solution, but its leaching effect is not very satisfactory. In order to improve the effect of the uranium loaded uranium resin in uranium mine wastewater treatment, this paper describes the leaching of uranium to a variety of alkaline eluent and compares it with several eluent used in the production process. The results show that this rinse was determined experimentally to efficiently rinse uranium off strongly basic anion exchange resin 717 (or weakly basic anion exchange resin 705). In the experiment, a moving bed countercurrent leaching device was used to achieve the desired effect of leaching uranium.