Method for controlling the precipitation of alumina

An alumina and precipitation technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, aluminate/alumina/aluminum hydroxide purification, etc., can solve the problems of poor quality, excessive purchase cost of lime, etc. Achieve the effect of increasing A/TC and improving precipitation efficiency

Inactive Publication Date: 2010-06-23
ALCOA OF AUSTRALIA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in addition to producing alumina of inferior quality compared to current practice, liquid carbonation necessitates the excessive purchase cost of lime, which requires the regeneration of caustic from sodium carbonate

Method used

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  • Method for controlling the precipitation of alumina
  • Method for controlling the precipitation of alumina
  • Method for controlling the precipitation of alumina

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Embodiment Construction

[0168] Best Mode for Carrying Out the Invention

[0169] The present invention focuses on the control of alumina precipitation in the Bayer process by the exchange of sodium ions in the Bayer process solution with ions on a solid support. By careful control of the exchange conditions, the precipitation of alumina from aluminate solutions can be controlled.

[0170] Figure 1a A schematic flow diagram showing a Bayer process for a refinery using a single digestion process, the Bayer process comprising the following steps:

[0171] Digest 12 bauxite 14 in a caustic solution;

[0172] liquid-solid separation 16 of the mixture into a residue 18 and a liquid 20;

[0173] Precipitating alumina 22 from liquid 20;

[0174] Separation of alumina 22 and liquid 24; and

[0175] The liquid 24 is recycled to the digestion 12 .

[0176] According to the first embodiment of the present invention and in Figure 1b As seen most clearly in , liquid 24 contacts ion exchange resin in ion ex...

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Abstract

A method for controlling the precipitation of alumina from a Bayer process solution, the method comprising the steps of: contacting the Bayer process solution with a solid support comprising an extractant, wherein the solid support is substantially water insoluble; removing sodium ions from the Bayer process solution; reducing the concentration of hydroxide ions in the Bayer process solution; and precipitating alumina in the Bayer process solution.

Description

field of invention [0001] The present invention relates to a method for controlling the precipitation of alumina from a Bayer process solution. Background technique [0002] The Bayer process is widely used for the production of alumina from alumina-containing ores such as bauxite. The process involves contacting an alumina-containing ore with a recycled caustic aluminate solution at elevated temperature in a process commonly referred to as digestion. Solids were removed from the resulting slurry and the solution was cooled to induce a state of supersaturation. [0003] Alumina is added as seed crystals to the solution to induce precipitation of more aluminum hydroxide from it. Precipitated alumina is separated from the caustic aluminate solution, known as spent liquor, with a portion of the alumina recycled for seeding and the remainder recovered as product. The remaining caustic aluminate solution is recycled for further digestion of the alumina-containing ore. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/47C01F7/144
CPCC01F7/47C01F7/144
Inventor 约翰·贝西达拉蒂提亚·埃莱娜·德尔莫布鲁斯·阿普丽尔·莫依尔
Owner ALCOA OF AUSTRALIA LTD
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