How to recover alumina from an alumina-containing caustic soda solution?
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How to recover alumina from an alumina-containing caustic soda solution?
Are there no experts in this area on the forum? ? ? :L
First, you need to check the ratio of alkali to aluminum concentration to determine whether water can be added for hydrolysis, precipitation, and separation
I’m not sure whether the solution you’re referring to is pure sodium aluminate solution or contains other components, and what its concentration is. Only after these details are known can a process plan be considered.
(1) Heating the silicoaluminate yields calcium-alumino-silicate and calcium-aluminate products； (2) Extract the said product with HCl to form a solution containing AlCl and insoluble silica ； (3) Separate insoluble silica from the solution ； And crystallizing AlCl from this solution, and recovering alumina from the crystallized AlCl.
The process for producing alumina by acid method is briefly described above. The poster said it is to recover alumina from caustic soda solution.