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what is digestion in bauxite refining

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what is digestion in bauxite refining

3 Digestion A hot caustic soda NaOH solution is used to dissolve the aluminiumbearing minerals in the bauxite gibbsite böhmite and diaspore to form a sodium aluminate supersaturated solution or “pregnant liquor” Gibbsite AlOH 3 Na OH→ AlOH 4 Na Böhmite and Diaspore AlOOH Na OH H 2 O → AlOH 4 Na

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