Vacuum concentration is used for the concentration of the slurry in phosphatic ammonium production
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For the second stage of pulp concentration in phosphatic ammonium production, vacuum concentration is used, with circulating water being employed to create the vacuum. I don’t quite understand how vacuum is generated – what is the principle behind it? I hope those who are familiar with this process can provide an explanation
I remember our teacher saying that it seems to involve a flash evaporation method, where a certain negative pressure (vacuum) is maintained in the flash chamber. When the material is heated to near-boiling temperature, it enters the flash chamber; due to the reduced pressure, the boiling point of the material drops, and the water turns into gas, thereby allowing the material to be concentrated.
German Memsys low-temperature non-metallic membrane distillation technology 18501003909