摘要
以NaCl和Na_(2)SO_(4)高浓盐水为原料,考察冷却结晶和冷冻浓缩过程对Na_(2)SO_(4)和NaCl结晶盐的分离。通过考察不同结晶温度下结晶盐的冷却结晶析出过程,可以得到纯度较高的Na_(2)SO_(4)结晶盐,说明可以采用冷却结晶方式,利用溶解度随温度变化差异分离Na_(2)SO_(4)。通过对冷冻浓缩过程的研究,表明当温度低于-9.9℃时,剩余浓缩液中主要为NaCl,对应NaCl结晶盐纯度可达到95%。通过深度浓缩NaCl浓盐水,可将NaCl浓缩至~27 wt%的浓度,产水中NaCl浓度不大于1 wt%,可经进一步处理后回用。因此,通过结合冷却结晶和冷冻浓缩过程,可以实现Na_(2)SO_(4)和NaCl结晶盐的冷法分离。
The separation of NaCl and Na_(2)SO_(4)crystalline salts was investigated via cooling crystallization and freezing concentration,by employing NaCl and Na_(2)SO_(4)high concentrated brine as raw water.By investigating the process of cooling crystallization at different crystallization temperature,it is found that the purity of Na_(2)SO_(4)crystalline salt is very high,which shows that the cooling crystallization method at low temperature can be used to separate Na_(2)SO_(4)due to different solubility with temperature.By the research on freezing concentration process,it shows that the remaining concentrate is mainly NaCl and the purity of the NaCl crystalline salt can reach 95%,when the temperature is lower than-9.9℃.Also,by the deep concentration of NaCl brine,the concentration can reach to~27 wt%,and the produced water is less than 1 wt%,which can be recycled by further treatment.Therefore,by combining cooling crystallization and freezing concentration process,the cold separation process of Na_(2)SO_(4)and NaCl crystalline salts can be realized.
作者
王缠和
耿春宇
李国强
贾梦磊
刘琪
史大昕
WANG Chanhe;GENG Chunyu;LI Guoqiang;JIA Menglei;LIU Qi;SHI Daxin(Beijing Institute of Technology,Beijing 102401,China;Synfuels China Inner Mongolia Co.,Ltd,Erdos 010321,China;Synfuels China Technology Holdings Co.,Ltd,Beijing 101407,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2023年第3期89-92,共4页
Technology of Water Treatment
基金
鄂尔多斯市科技重大专项(No.2021ZD工46-9)。
关键词
煤化工
浓盐水
结晶盐
冷却结晶
冷冻浓缩
coal chemical industry
concentrated brine
crystalline salt
cooling crystallization
freezing concentration
