Which method, cold crystallization or thermal crystallization, requires more energy for the production of sodium sulfate?
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Sodium sulfate is recovered from waste liquid; determine which method – cold crystallization or thermal crystallization – requires more energy for the production of sodium sulfate, and analyze the reasons.
Sodium sulfate is mirabilite below 32°C and can be frozen into crystals. Above 32°, cold crystallization is not suitable; therefore, if sodium sulfate, also known as Glauber’s salt, is to be obtained, thermal crystallization should be used