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IMPROVEMENT TO BAYER PROCESS FOR MAKING ALUMINA TRIHYDRATE, SAID IMPROVEMENT CONCERNING THE SEPARATION OF ALUMINATE LIQUOR AND INSOLUBLE RESIDUES
IMPROVEMENT TO BAYER PROCESS FOR MAKING ALUMINA TRIHYDRATE, SAID IMPROVEMENT CONCERNING THE SEPARATION OF ALUMINATE LIQUOR AND INSOLUBLE RESIDUES
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机译:制备三水合氧化铝的拜耳工艺的改进,分离铝水和不溶残渣的有效改进
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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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