In response to the current situation of mixed salt production in a zero emission coal chemical project,in order to achieve the re-utilization of crystalline salt,a combined nanofiltration technology and recrystallization process is employed to renovate the original project.The results show that the combined nanofiltration process can effectively achieve salt separation and concentration functions.When Cl-/SO42-=0.37-0.98 in the inlet water,the combined nanofiltration process generates water with a Cl-/SO42-ratio of 30.7-298.5(mean value 117.9),and a concentrated water with a Cl-/SO42-ratio of 0.09-0.28(mean value0.15)and a SO42-concentration of 80 000 mg·L-1.The retention exceeds 99%,and the average retention rate of Cl-is-18.9%.The qualified NaCl and Na2 SO4 crystalline salts with a purity over 98.5%are generated,effectively achieving the re-utilization of mixed salt.
combined nanofiltrationcoal chemical industrymixed saltsalt separationre-utilization
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