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Improvement in the bayer process for the production of alumina trihydrate, the said improvement in the separation of the aluminate liquor and the insoluble residue
Improvement in the bayer process for the production of alumina trihydrate, the said improvement in the separation of the aluminate liquor and the insoluble residue
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机译:改进生产三水合氧化铝的拜耳法,所述改进铝酸盐溶液和不溶残渣的分离
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摘要
A process for the production of alumina trihydrate by alkaline digestion of bauxite using the Bayer process in which aluminate liquor and insoluble residues are separated using a solid/liquid separation device (E; W2; DC) characterised in that the said slurry (21a; 41; 230′) is at least partially passed through a hydrocyclone (H1; H21; H22; H3) to improve and accelerate the separation of the sodium aluminate liquor from the insoluble residues in the slurry (21a; 41; 230′) containing the said liquor and the said residues and that supplies or is derived from the said liquid-solid separation device. In a first embodiment, at least one hydrocyclone is used at the upstream side of the settler-thickener, as clarifier of the pregnant liquor. In a second embodiment, at least one hydrocyclone is used as a thickener of insoluble residue mud. In a third embodiment, a hydrocyclone is used in combination with the causticisation settler.
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