How can a mixed solution of sodium sulfate and sodium chloride be used to completely separate the two salts?
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How can a mixed solution of sodium sulfate and sodium chloride be used to completely separate the two salts? 1. In the mixture, Na+ (mg/L): 6000–19000; Cl- (mg/L): 5000–20000; SO42- (mg/L): 4000–16000. 2. The quality requirements for the NaCl produced after separation are those of refined industrial salt (GB/T 5462-2015), specifically grade II for industrial dry salt. As for Na2SO4 crystals, the required standard is that of industrial anhydrous sodium sulfate (GB/T 6009-2014), grade I, category II. 3. Achieve zero wastewater discharge.
This is the crystalline salt product in the zero-waste discharge system. The experience of Shenhua Coal-to-Oil Company’s thick liquid crystallization unit can be used as a reference. Dual reuse of water and salts in Shenhua’s coal-to-oil process wastewater https://bbs.hcbbs.com/thread-1865034-1-1.html (Source: Haichuan Chemical Industry Forum Website)
These two salts can be separated by membrane filtration
The membrane separation process is very difficult to operate; the membranes get clogged frequently, making it hard to maintain continuous production.
Membrane separation is not easy; it is recommended to use a crystallization process instead
This post was last edited by Fang Shiyu on 2018-11-29 at 16:26. According to phase diagrams, evaporation and crystallization are used for separation; salt is produced at high temperatures while nitrate is obtained at low temperatures. However, your concentration is too low, making the process uneconomical
Indeed, crystallization separation is required.