化工进展2026，Vol.45Issue(8)：4521-4528,8.DOI:10.16085/j.issn.1000-6613.2025-1380
溶析-蒸发结晶法分离Na2SO4/NaCl混盐
Separation of Na2SO4/NaCl mixed salt by antisolvent-evaporation crystallization method
摘要
Abstract
With the rapid advancement of industrialization,the annual production of industrial waste salt in China has exceeded 2×107t.One of the key approaches to the resource utilization of industrial waste salt involves the separation,purification,and recovery of inorganic salts such as Na2SO4 and NaCl.An antisolvent-evaporation crystallization salt separation process was developed for the Na2SO4/NaCl mixed salt system.The antisolvent was screened,and the optimal process conditions were determined by exploring the effects of solid-liquid ratio,ratio of salt and mirabilite,antisolvent concentration,and number of antisolvent cycles on the Na2SO4/NaCl mixed salt separation products.Subsequently,this process was applied to the separation of actual industrial waste salts.The experimental results showed that NaOH was the most suitable antisolvent for Na2SO4/NaCl mixed salt separation among the three antisolvents of H2SO4,HCl and NaOH.The optimal operating conditions of this process were as follows:the concentration of antisolvent NaOH solution was 8mol/L,the solid-liquid ratio was 200g/L,the ratio of salt and mirabilite was 3∶7,and the number of antisolvent cycles was 5 times.This process was applied to the separation of Na2SO4/NaCl waste salt obtained from a chemical plant sewage after RO membrane treatment.The purity of Na2SO4 crystal obtained by separation was 94.63％,and the purity of NaCl crystal was 97.83％.In this application,the process yielded a profit of 1945-2465CNY per ton of treated Na2SO4/NaCl waste salt,demonstrating its technical and economic viability.关键词
蒸发/溶析/结晶/分离/废盐Key words
evaporation/antisolvent/crystallization/separation/waste salt分类
化学化工引用本文复制引用
程文婷,许翊轩,赵佳庥,成怀刚,程芳琴..溶析-蒸发结晶法分离Na2SO4/NaCl混盐[J].化工进展,2026,45(8):4521-4528,8.基金项目
国家重点研发计划(2022YFC3901305) （2022YFC3901305）
中央引导地方科技发展资金(YDZJSX2025D012) （YDZJSX2025D012）
国家自然科学基金(22478232). （22478232）
