A kind of preparation method of stable sodium metaaluminate solution

A sodium metaaluminate and solution technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of poor stability of sodium metaaluminate solution, and achieve the advantages of heat dissipation, good stability, Add less effect

Active Publication Date: 2016-10-19
山东利尔新材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art and solve the problem of poor stability of sodium metaaluminate solution, the present invention proposes a preparation method of stable sodium metaaluminate solution

Method used

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  • A kind of preparation method of stable sodium metaaluminate solution
  • A kind of preparation method of stable sodium metaaluminate solution
  • A kind of preparation method of stable sodium metaaluminate solution

Examples

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Effect test

Embodiment 1

[0021] A kind of preparation method of stable sodium metaaluminate solution is realized by following process:

[0022] (1) Dissolve 220g of sodium hydroxide in 422g of demineralized water to prepare a sodium hydroxide solution, and add it to a three-necked flask with a reflux device, start stirring, and adjust the stirring speed to 110r / min. And within 1h, the sodium hydroxide solution was heated to 90°C.

[0023] (2) Add 350g of aluminum hydroxide and adjust the stirring speed to 40r / min until the aluminum hydroxide is completely dissolved and the solution is clear; then within 0.5h, gradually heat up to 90°C and keep it warm for about 2 hours, then add 0.5wt% The stabilizer was stirred evenly at a speed of 20r / min to obtain sodium metaaluminate.

[0024] (3) A plate and frame filter press is used for press filtration, and the temperature of the finished product should not be too high during press filtration, and should be controlled at 40°C;

[0025] (4) Decolorize the abo...

Embodiment 2

[0030] A kind of preparation method of stable sodium metaaluminate solution is realized by following process:

[0031] (1) Dissolve 225g of sodium hydroxide in 430g of demineralized water to prepare a sodium hydroxide solution, and add it to a three-necked flask with a reflux device, start stirring, and adjust the stirring speed to 115r / min. And within 1-2h, the sodium hydroxide solution was heated to 90-180°C.

[0032] (2) Add 355g of aluminum hydroxide, adjust the stirring speed to 50r / min until the aluminum hydroxide is completely dissolved and the solution is clear; then within 0.8h, gradually heat up to 150°C and keep it warm for about 8 hours, then add 1wt% of Stabilizer, after stirring evenly at a speed of 25r / min, sodium metaaluminate was obtained.

[0033] (3) A plate and frame filter press is used for press filtration, and the temperature of the finished product should not be too high during press filtration, and should be controlled at 50°C;

[0034] (4) Decoloriz...

Embodiment 3

[0039] A kind of preparation method of stable sodium metaaluminate solution is realized by following process:

[0040] (1) Dissolve 230g of sodium hydroxide in 436g of demineralized water to prepare a sodium hydroxide solution, and add it to a three-necked flask with a reflux device, start stirring, and adjust the stirring speed to 120r / min. And within 2h, the sodium hydroxide solution was heated to 180°C.

[0041] (2) Add 360g of aluminum hydroxide, adjust the stirring speed to 60r / min, until the aluminum hydroxide is completely dissolved, and the solution is clear; then within 1h, gradually raise the temperature to 160°C, keep it warm for about 10 hours, and then add 2wt% of stable agent, after stirring evenly at a speed of 30r / min, sodium metaaluminate was obtained.

[0042] (3) A plate and frame filter press is used for press filtration, and the temperature of the finished product should not be too high during press filtration, and should be controlled at 70°C;

[0043] ...

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Abstract

The invention provides a method for preparing a stable sodium metaaluminate solution and belongs to the aluminum chemical field. According to the method, water used in the stable sodium metaaluminate solution preparing process is softened water, the conductivity is as low as 1-2 ppm, the purity is high, and the impurity content is low; in the preparing process, a high-temperature low-speed synthesis method is adopted, heat dissipation is facilitated, and a bumping phenomenon is avoided; the prepared stable sodium metaaluminate product has high purity, short technological process and low cost, and compared with the prior art, the method realizes industrial production more easily. A stabilizer used in the method for preparing the stable sodium metaaluminate solution has the advantages of high stability, few additives and the like, a better stabilizing effect can be realized when 0.5-2wt% of the stabilizer is added, and more than one year of storage and transport stability can be kept.

Description

technical field [0001] The invention relates to a method for producing a stable sodium metaaluminate solution, which belongs to the field of aluminum chemical industry. Background technique [0002] With the rapid development of the chemical industry, a large amount of activated alumina is required as a catalyst or carrier in the production process of many chemical products. Generally speaking, activated alumina is required to have three highs: high purity, high specific surface area and high pore volume. Because the general γ-Al2O3 contains a large amount of harmful impurities, such as sodium, silicon, iron and calcium ions, which will poison the catalyst and reduce the catalytic efficiency. In order to avoid catalyst poisoning, many catalyst fields use ultra-high activity alumina. Most of the materials use ultra-high-purity pseudo-boehmite. The specific surface area and pore volume of pseudo-boehmite directly affect its application range and dosage. The industrial produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/04
Inventor 于迅刘东
Owner 山东利尔新材股份有限公司
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