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A low-sodium alumina decomposition process and low-sodium alumina

A technology of alumina and aluminum hydroxide, which is applied in the preparation of alkali metal aluminate/aluminum oxide/aluminum hydroxide, etc., can solve the problems of increasing product production costs, environmental pollution, etc., reduce lattice bases, and ensure economic benefits , the effect of improving economic efficiency

Active Publication Date: 2020-09-01
三门峡义翔铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using these methods to produce low-sodium high-temperature alumina will not only pollute the environment, but will also greatly increase the production cost of the product

Method used

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  • A low-sodium alumina decomposition process and low-sodium alumina
  • A low-sodium alumina decomposition process and low-sodium alumina
  • A low-sodium alumina decomposition process and low-sodium alumina

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Embodiment 1

[0028] The invention provides a low-sodium alumina decomposition process. The Bayer method is used to produce alumina, and a seed crystal is added to the sodium aluminate semen, and the sodium aluminate in the semen is decomposed, so that the alumina is precipitated as aluminum hydroxide, and the aluminum hydroxide is Carry out low-temperature roasting to obtain low-sodium alumina; among them, in the process conditions of sodium aluminate decomposition: the solid content of the first tank is limited to 570g / cm 3 , the temperature of the first tank of decomposition is 67℃, the semen α k is 1.5, and the decomposition time of the sodium aluminate solution is ≥50h.

[0029] The decomposition tanks are specifically set as No. 1 decomposition first tank, No. 2-3 decomposition tank, No. 4-15 decomposition tank and No. 16 decomposition end tank. The decomposition temperature of No. 1-3 is 65-67 °C. From the beginning of the tank, the decomposition temperature decreases successively. ...

Embodiment 2

[0031] The invention provides a low-sodium alumina decomposition process. The Bayer method is used to produce alumina, and a seed crystal is added to the sodium aluminate semen, and the sodium aluminate in the semen is decomposed, so that the alumina is precipitated as aluminum hydroxide, and the aluminum hydroxide is Carry out low-temperature roasting to obtain low-sodium alumina; among them, in the process conditions of sodium aluminate decomposition: the solid content of the first tank is limited to 670g / cm 3 , the decomposition first tank temperature is 65℃, semen α k is 1.55, and the decomposition time of the sodium aluminate solution is ≥50h.

[0032] The decomposition tanks are specifically set as No. 1 decomposition first tank, No. 2-3 decomposition tank, No. 4-15 decomposition tank and No. 16 decomposition end tank. The decomposition temperature of No. 1-3 is about 65 ° C. From No. 4 decomposition tank At the beginning, the decomposition temperature decreased success...

Embodiment 3

[0034] The invention provides a low-sodium alumina decomposition process. The Bayer method is used to produce alumina, and a seed crystal is added to the sodium aluminate semen, and the sodium aluminate in the semen is decomposed, so that the alumina is precipitated as aluminum hydroxide, and the aluminum hydroxide is Carry out low-temperature roasting to obtain low-sodium alumina; among them, in the process conditions of sodium aluminate decomposition: the solid content of the first tank is limited to 650g / cm 3 , the temperature of the first tank of decomposition is 66°C, the semen α k 1.52, semen N k 156g / l, dissolution α k is 1.50, and the decomposition time of the sodium aluminate solution is ≥50h.

[0035] The decomposition tanks are specifically set as No. 1 decomposition first tank, No. 2-3 decomposition tank, No. 4-15 decomposition tank and No. 16 decomposition end tank. The decomposition temperature of No. 1-3 is 65-66 ° C. At the beginning of the tank, the decompo...

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Abstract

The invention relates to a low-sodium aluminum oxide decomposition process, which comprises the following steps of adjusting the solid content of a first tank, improving temperature for decomposing the first tank and the alpha k value of seminal fluid. Lattice alkali in aluminum hydroxide is remarkably reduced, so that Na2O content in the finally prepared aluminum oxide is lowered and stabilized to be 0.25% or below, even to be 0.09%, which is greatly lower than 0.5% as specified internationally, meanwhile, a relatively high resolution ratio is guaranteed, and the economic benefit of aluminumoxide production is improved. Low-sodium aluminum hydroxide is directly roasted to prepare low-sodium high-temperature aluminum oxide, a mineralizer is not used, and secondary pollution cannot be caused to products. According to the low-sodium aluminum hydroxide prepared by the decomposition process, the content of sodium oxide in the low-sodium aluminum hydroxide is as low as 0.09-0.25%. The selling price of the low-sodium aluminum oxide prepared in the invention is higher than the selling price of ordinary metallurgical grade aluminum oxide by 52 Yuan / ton, and the productive economic benefitis greatly improved.

Description

technical field [0001] The invention belongs to the technical field of alumina production, and in particular relates to a low-sodium alumina decomposition process and low-sodium alumina. Background technique [0002] The content of sodium oxide is one of the important technical indicators to measure the grade of high-temperature alumina. In the field of wear-resistant products and ceramic applications, the content of sodium oxide has a great influence on the mechanical strength and electrical conductivity of alumina products. In the past, there are generally the following methods for producing low-sodium high-temperature alumina: 1) Light-burned aluminum hydroxide is washed to remove alkali: industrial aluminum hydroxide quickly passes through an area with a temperature of about 430°C within one hour, and the temperature is 30°C Treatment with distilled water or desalinated water at a temperature of about 50°C can reduce the alkali content to 0.023% or 0.015% respectively; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
CPCC01F7/14
Inventor 苏红伟龚智远冯延磊卫学武周运刚曹国楚苏喜振范顺良马昕魏新峰韩涛李文博杨原栋古军
Owner 三门峡义翔铝业有限公司