发明名称 |
VERBESSERTES BAYER-VERFAHREN ZUR HERSTELLUNG VON ALUMINIUMTRIHYDRAT HINSICHTLICH TRENNUNG VON ALUMINATLAUGE UND UNLÖSLICHEN RÜCKSTÄNDEN |
摘要 |
<p>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.</p> |
申请公布号 |
AT451327(T) |
申请公布日期 |
2009.12.15 |
申请号 |
AT20050805784T |
申请日期 |
2005.09.19 |
申请人 |
ALUMINIUM PECHINEY |
发明人 |
ROUSSEAUX, JEAN-MARC;PIGNOL, GERARD;MAGNAN, YVES |
分类号 |
C01F7/06;B01D21/01;B01D21/26;C01F7/47 |
主分类号 |
C01F7/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|