随着精细化工及中间体产品的发展,各类副产废盐量不断增加,由于其产生量大及难处理等特点,成为阻碍行业发展的一大瓶颈。主要开展了医药副产含磷废盐的提纯实验研究,针对废盐产生的途径和特性,采用洗脱剂（甲醇-乙醇）+活性炭混合洗脱与重结晶的方式,分别去除废盐中的有机物和氯化钠,回收可利用的磷酸盐,实现废盐的提纯资源化。当洗脱剂与废盐的体积质量比为1 mL/g、洗脱剂甲醇与乙醇的体积比为4∶6、活性炭用量为废盐质量的0.4%时,废盐中的有机物得到了有效去除。随后对得到的混盐进行重结晶得到回收磷酸盐,回收磷酸盐的纯度可达98%以上,符合工业磷酸盐行业标准的要求。将含磷废盐提纯回收磷酸盐,1 t废盐的处理成本约为174.24元,可回收0.61 t磷酸盐,实现了废盐的资源化再利用。

With the development of fine chemicals and intermediate products,the amount of various types of by-product waste salts continues to increase.Due to its large volume and difficult to be treated,it has become to be a critical bottleneck that hin-ders the development of the industry.The purification experimental study of phosphorus-containing waste salt produced as by-product of medicine was carried out.According to the generation method and characteristics of waste salt,methanol/ethanol mixed with activated carbon were used to remove organic matter and sodium chloride in waste salt by elution and recrystal-lization.When the volume to mass ratio of eluent to waste salt is 1 mL/g,the volume ratio of eluent methanol to ethanol is 4∶6,and the mass dosage of activated carbon to the waste salt is 0.4%,the organism in the waste salt has been removed effectively.Subsequently,the obtained mixed salt is recrystallized with the purity of phosphate more than 98%,which meets the industrial phosphate standard.The treatment cost of waste salt is about 174.24 RMB/t and 0.61 t of phosphate can be reco-vered by the above purification and recovery process,realizing the reuse of waste salt.