In the Bayer process for producing alumina from bauxite ore, aluminium is leached into caustic solution in the digestion stage as aluminate [1]. The pregnant liquor is isolated and clarified through settling and liquor filtration. Aluminium trihydroxide (gibbsite; Al(OH)3) is then precipitated from the liquor. This is achieved by cooling the solution and seeding with gibbsite, essentially reversing the initial dissolution process.Gibbsite is then either recycled as seed or converted to alumina by high temperature calcination