Low-sodium aluminum oxide and preparation method thereof

A sodium alumina and alumina technology, applied in the field of low sodium alumina and its preparation, can solve problems such as environmental pollution and achieve the effect of low sodium oxide content

Active Publication Date: 2022-08-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of this application is to provide a low-sodium alumina and its preparation method, which has solved the problem that the current production of low-sodium will pollute the environment

Method used

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  • Low-sodium aluminum oxide and preparation method thereof

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preparation example Construction

[0029] According to a typical embodiment of the present invention, there is provided a preparation method of low sodium alumina, the method comprising:

[0030] S1. aluminum hydroxide is pre-calcined to obtain calcined alumina;

[0031] S2. the calcined alumina and water are mixed and beaten to obtain slurry;

[0032] S3. pass the neutralized gas into the slurry to carry out neutralization reaction, then carry out liquid-solid fractionation, washing and drying to obtain low-sodium alumina; the composition of the neutralized gas includes carbon dioxide, and the carbon dioxide volume concentration is 35% -40%, the pressure of the neutralized gas is 0MP-0.6MP.

[0033] The reason for controlling the volume concentration of carbon dioxide to be 35%-40% is based on the comprehensive consideration of the carbon dioxide gas absorption rate and the neutralization reaction efficiency. The adverse effect of this concentration is that the carbon dioxide gas absorption rate is low and a ...

Embodiment 1

[0049] A preparation method of low-sodium alumina, the method comprising:

[0050] 1) The preparation method of the low-sodium alumina of the present invention uses ordinary industrial aluminum hydroxide as the raw material, the roasting temperature is 700° C., the roasting time is 30 minutes, the particle size D50 is 78 μm, and the sodium oxide content is 0.28%.

[0051] 2) Mix and beat with distilled water at room temperature 50 ℃ and the alumina after roasting, control the solid content of the slurry to be 300g / l, after stirring evenly, feed carbon dioxide gas with a concentration of 35%, and the gas feed rate of 1m3 slurry is 90m3 / hour, keep the ventilation pressure at 0.1MP for 20 minutes, then carry out liquid-solid separation, wash with hot distilled water, and obtain low-sodium alumina.

[0052] 3) calcined at 1350°C for 3 hours to obtain low sodium and high temperature alumina.

Embodiment 2

[0054] A preparation method of low-sodium alumina, the method comprising:

[0055] 1) The preparation method of the low-sodium alumina of the present invention uses ordinary industrial aluminum hydroxide as the raw material, the roasting temperature is 650° C., the roasting time is 60 minutes, the particle size D50 is 72 μm, and the sodium oxide content is 0.25%.

[0056] 2) Mixing and beating with 60 ℃ of distilled water and roasted alumina, control the solid content of the slurry at 350g / l, after stirring, feed carbon dioxide gas with a concentration of 35%, 1m The gas feed rate of the slurry is 90m3 / hour , the ventilation pressure is 0.2MP and the ventilation time is 20 minutes, and then liquid-solid separation is carried out, washed with hot distilled water, and low-sodium alumina is obtained.

[0057] 3) calcined at 1350°C for 3 hours to obtain low sodium and high temperature alumina.

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Abstract

The invention particularly relates to low-sodium aluminum oxide and a preparation method thereof, and belongs to the technical field of aluminum oxide preparation, and the method comprises the following steps: pre-roasting aluminum hydroxide to obtain roasted aluminum oxide; mixing and pulping the roasted aluminum oxide and water to obtain slurry; introducing neutralized gas into the slurry to carry out neutralization reaction, and then carrying out liquid-solid separation, washing and drying to obtain low-sodium aluminum oxide; wherein the component of the middle gas comprises carbon dioxide, the volume concentration of the carbon dioxide is 35%-40%, and the pressure of the middle gas is 0 MP-0. 6 MP; cO2 gas is introduced under the pressurization condition for sodium removal, the content of sodium oxide in the product is low, washing liquid can be recycled, and the method is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of alumina preparation, in particular to a low-sodium alumina and a preparation method thereof. Background technique [0002] The calcined raw material of high temperature alumina is aluminum hydroxide. Due to the high content of sodium oxide in industrial common aluminum hydroxide, a certain amount of β-alumina is generated during the calcination process, which greatly reduces the conversion rate of α-alumina and At the same time, the grain size of alumina will be coarsened and the crystal shape will be irregular. At high temperature, the change of β-alumina to α-alumina during the conversion process will cause the deformation of corundum refractory products. The higher the sodium oxide content, the worse the high temperature alumina insulation performance and the lower the mechanical strength. [0003] Low-sodium high-temperature alumina is widely used in high-temperature porcelain parts, wear-resistant p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/021C01F7/30C01F7/46
CPCC01F7/02C01F7/30C01F7/46C01F7/021C01P2004/61C01P2006/80Y02P20/151
Inventor 王科张艳孙兴波苏爱玲
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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