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Alumina recovery

一种氧化铝、氢氧化物的技术，应用在铝酸盐/氧化铝/氢氧化铝纯化、碱金属铝酸盐/氧化铝/氢氧化铝制备、无机化学等方向

Inactive Publication Date: 2008-03-26
SOUTH32 ALUMINUM RAA PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] To date, there is no known method of increasing the alumina concentration of the liquor after dissolution

Method used

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  • Alumina recovery
  • Alumina recovery
  • Alumina recovery

Examples

Experimental program
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Embodiment 1

[0062] Example 1: Recovery of alumina from stripped feed

[0063] A first embodiment of the present invention is illustrated in the simplified process flow diagram of FIG. 2 . The bauxite is ground and desiliconized in the usual manner and then supplied to the slurry tank 12 for slurrying prior to dissolution. A effluent stream from the sedimentation is also fed to the slurry tank 12 using the conventional Bayer process. In this embodiment of the invention, the first liquid is transferred to reaction vessel 14 after precipitation in the form of all or part of the waste liquid stream. The stirring conditions within the reaction vessel 14 are not critical, but the contents of the reaction vessel 14 should preferably be completely suspended.

[0064] A slaked lime slurry is formed in the slaker 16 by adding quicklime and a slurry solution to the slaker 16 . This slaked lime slurry is then added to reaction vessel 14, where it reacts with the aluminate ions in the first liquid...

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Abstract

A process for recovering alumina values from a first liquor having an initial concentration of aluminate ions and hydroxyl ions in solution is described. The first liquor is treated with a hydroxide of a metal other than aluminium to form an aluminium-bearing layered double hydroxide and produce a treated stream of first liquor, the treated stream of first liquor having a final concentration of aluminate ions less than the initial concentration of aluminate ions. The aluminium-bearing layered double hydroxide is separated from the treated stream of first liquor. Thereafter the clarified treated stream of first liquor is returned to a first location within an alumina refinery. The separated aluminium-bearing layered double hydroxide is contacted with a solution containing carbonate ions to form a slurry comprising an insoluble salt of the metal other than aluminium and a second liquor comprising aluminate ions released from the aluminium-bearing layered double hydroxide.

Description

technical field [0001] The present invention relates to a process for the recovery of alumina species from a first liquid stream containing aluminate ions and hydroxide ions in solution by forming a layered double hydroxide with aluminum. [0002] The present invention further relates to the use of layered double hydroxides (LDH) bearing aluminum to improve the recovery of alumina species from bauxite using a modification of the Bayer process. Background technique [0003] The Bayer process has been used for more than a century to recover alumina material from bauxite ore. The process focuses on the following reversible reaction equation (1), for gibbsite and boehmite ore or diaspore respectively: [0004] Al(OH) 3 +OH - Al(OH) 4 - (1) [0005] AlO(OH)+OH - +H 2 OAl(OH) 4 - (2) [0006] A schematic process flow diagram showing the basic execution procedure of the conventional Bayer method is shown in FIG. 1 . The blended bauxite is first mixed w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04C01F7/47C01F7/46C01F7/0646C01F7/0606C01F7/784C01F7/785
CPCC01F7/0646C01F7/0606C01P2002/22C01F7/004C01F7/005C01F7/785C01F7/784
Inventor S·P·罗森堡
Owner SOUTH32 ALUMINUM RAA PTY LTD
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