REx（CO3）y沉淀废水处理的资源化研究

Recycling of REx（CO3）y Precipitation Wastewater Treatment

为了开发稀土冶炼及沉淀废水处理方法的清洁生产工艺,本文针对稀土元素分离过程中,以氨皂化工艺为前提,萃取分离混合或单一稀土元素时所产生的REx（CO3）y沉淀废水进行研究,将REx（CO3）y沉淀废水采用电解的方法处理后,将电解产物进行资源转化研究。废水电解处理的主要产物为HCl和NH3,NH3迅速溶于电解溶液中,研究将NH3从电解溶液中分离并与CO2生成NH4HCO3,电解后的水经净化处理形成的纯水,应用于冶炼生产,形成可资源转化的循环利用工艺。文章剖析了资源化研究（N2吹脱NH3·H2O,NH3·H2O分离和NH4HCO3形成）的原理;设计了资源化实验方法;确定最佳实验条件;验证了资源化应用的产品效果。所研究的资源化工艺只引入CO2气体,不产生其他污染物。按本文提出工艺处理生产的REx（CO3）y产品与原工艺生产的REx（CO3）y产品无差别,资源化研究工艺符合清洁生产要求,渴望为REx（CO3）y冶炼的实际生产提供参考依据。

In order to develop a clean production process for rare earth smelting and sedimentation wastewater treatment,REx（CO3）y precipitated wastewater generated from the extraction and separation of mixed or single rare earth elements was studied in the process of rare earth element separation with ammonia saponification as the prerequisite study. After treating the REx（CO3）y precipitation wastewater with electrolysis method,the electrolysis products were studied for resource conversion. The main products of wastewater electrolysis treatment were HCl and NH3,and NH3 would quickly dissolved in the electrolytic solution. The NH3 was first separated from the electrolytic solution and then formatted NH4 HCO3 with CO2. Pure water formed after the electrolysis of water was purified and applied to smelting production,the recyclable resources technology could be converted to a cycle. The paper analyzed the principle of recycling research(N2 stripping NH3·H2 O,NH3·H2 O separation and NH4 HCO3 formation） and the design of recycling experimental methods,and the best experimental conditions was determined,as well as the product effect of resource application was verified. The reclamation process only introduced CO2 gas and did not generate other pollutants. The REx（CO3）y product produced by the process according to this article had no difference from the REx（CO3）y product normally produced. The resource research process met the requirements of cleaner production and we desired to provide evidence for the actual production of REx（CO3）y smelting.