水洗法处理酮连氮法制水合肼副产废盐的工艺优化  

Water washing process optimization for the treatment of waste salt by-product of hydrazine hydrate produced by ketazine method

作　　者：王波 池勇志 田秉晖[2] 封玲 朱铭 WANG Bo;CHI Yongzhi;TIAN Binghui;FENG Ling;ZHU Ming(Tianjin Key Laboratory of Water Quality Science and Technology,School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;National Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,University of Chinese Academy of Sciences,Beijing 100085,China)

机构地区：[1]天津城建大学环境与市政工程学院,天津市水质科学与技术重点实验室,天津300384 [2]中国科学院生态环境研究中心,环境水质学国家重点实验室,北京100085

出　　处：《环境工程学报》2021年第6期2054-2062,共9页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07107-002)。

摘　　要：酮连氮法制水合肼会产生大量的副产废盐,这些副产盐因其中所含杂质有机物较多而无法直接回用于离子膜电解过程。采用水洗法处理此类废盐,可基本去除废盐中的杂质有机物,使废盐能够满足电解制碱的要求。为进一步探究水洗法处理废盐过程中各因素间的影响关系,采用响应曲面法,分别建立了废盐失重率和UV_(254)去除率与液固质量比、水洗次数和盐温度的优化模型,优化了工艺所采用的实验条件。结果表明,液固质量比、水洗次数和盐温度3者对废盐水洗过程的影响的强弱为,水洗次数>液固质量比>盐温度。根据模型预测,最佳工艺条件为,液固质量比为5:8、水洗次数2次、盐温度25℃、停留时间5 min。在最佳工艺条件下的废盐失重率和UV_(254)去除率分别为12.6%和97.8%,实验结果与模型预测结果基本一致。处理后的废盐可满足离子膜电解用盐标准,水洗法可有效去除废盐中的杂质有机物,响应曲面法的优化结果对实际水洗过程具有指导意义。The production of hydrazine hydrate by the ketazine method can produce a large amount of byproduct waste salt.These by-product salts cannot be directly reused in the ion-exchange membrane electrolysis process because they contain more organic impurities.The use of water washing to treat this kind of waste salt can achieve the basic removal of organic impurities in the salt,so that the waste salt can meet the requirements of the electrolytic production of sodium hydroxide.To explore the influences of various factors in the water washing process for treating the waste salt by-product of hydrazine hydrate produced by the ketazine method,the response surface method was used to establish the models of waste salt weightlessness rate and UV_(254) removal rate with liquid-solid mass ratio,washing times and the salt temperature and the experimental conditions used in the process were optimized.The results showed that the effects of liquid-solid mass ratio,the washing times and the salt temperature on the waste salt water washing process are:water washing number>Liquid mass ratio>salt temperature.According to the model predictions,the best process conditions were as follows:liquid-solid mass ratio 5:8,washing times 2 times,salt temperature 25℃,and residence time 5 min.Under these conditions,the waste salt weightlessness rate and UV_(254) removal rate were 12.6% and,97.8% respectively,which were basically consistent with the predicted results.The treated waste salt could meet the salt standard for diaphragm electrolysis,indicating that the water washing method is feasible to remove the organic impurities in the waste salt.The response surface method has guiding significance for the actual washing process.

关 键 词：水合肼废盐 水洗法 工业废盐 响应面法 

分 类 号：X703[环境科学与工程—环境工程]