C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/250
C01F 7/06 (2006.01) C01F 7/14 (2006.01)
Patent
CA 2011860
Process for the production of aluminium hydroxide by digesting bauxite with alkali solution and precipitating aluminium hydroxide from the digestion solution, comprising: a combining bauxite and alkali solution having a caustic concentration of at least 180 grams per litre expressed as sodium carbonate and digesting partly the bauxite in the combined product in a first digestion step at relatively low temperature, b separating reaction product obtained in step a into a liquid phase and a solids/liquid slurry, c combining liquid phase and solids/liquid slurry obtained in step b and digesting the combined product in a second digestion step at relatively high temperature, d releasing heat from the reaction product obtained in step c to preheat liquid phase obtained in step b, a separating the reaction product obtained in step d into a supersaturated sodium aluminate solution and undissolved material, f precipitating aluminium hydroxide from the supersaturated sodium aluminate solution obtained in step a and separating aluminium hydroxide from the spent liquor, and g recycling spent liquor obtained in step f to step a for use as alkali solution.
Den Hond Roelof
Rijkeboer Albert
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Shell Internationale Research Maatschappij B.v.
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