危废盐中最主要的可溶性盐类为氯化钠与硫酸钠,再生过程中会产生氯化钠与硫酸钠的共饱和母液。开发了一种"稀释"、"纳滤"、"反渗透"与"蒸发结晶"相结合的氯化钠、硫酸钠共饱和母液处理工艺,并获得了溶液稀释浓度与产品盐量、杂盐量、电耗、蒸汽耗量和年运行成本的定量关系。分析结果表明,母液被稀释倍数越高,纳滤膜对2价离子的截留效率越高,产品盐回收率越高,外排的杂盐量越少,总运行成本越低。

Main soluble salts in hazardous waste salts are sodium chloride and sodium sulfate,and the co-saturated mother liquor of sodium chloride and sodium sulfate will be produced in the process of regeneration.A co-saturated mother liquor treatment process for sodium chloride and sodium sulfate is developed,which combines with "dilution","nanofiltration","reverse osmosis" and "evaporative crystallization".The quantitative relationships between solution dilution concentration and the production of product salt,the production of abraum salt,electricity consumption,steam consumption,and annual operating cost respectively are obtained.The results show that the higher the dilution ratio of the co-saturated mother liquor of sodium chloride and sodium sulfate is,the higher the interception efficiency of bivalent ions of the nanofiltration membrane is,the higher the salt recovery rate of the product is,the less the amount of abraum salt discharged is,and the lower the total operating cost is.