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Method of producing pseudo boehmite

A technology of pseudo-boehmite and sodium metaaluminate is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, alumina/aluminum hydroxide, etc., which can solve the problem that the product quality is difficult to guarantee and the production cost is high. , large water consumption and other problems, to achieve the effect of easy product quality assurance, low production cost and small washing water consumption

Active Publication Date: 2008-05-07
中铝山东新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this high pH value, the gelation reaction is carried out, the alkalinity is high, and the total alkali concentration value N T The product obtained through aging needs to be washed with a large amount of hot water, especially the crystallized alkali that enters between the crystals, which is more difficult to wash away, consumes a lot of water, and the production cost is high, and the product quality is not easy to guarantee

Method used

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  • Method of producing pseudo boehmite

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Sodium metaaluminate solution 3L (Al 2 o 3 Content is 105g / L, caustic ratio 1.5), adding distilled water or deionized water to dilute to Al 2 o 3 The content is 41g / L, the temperature is cooled to 33-35°C, and the impurities are removed by filtration and purification. Infuse 35-38% CO 2 The gas undergoes rapid carbonation into a gel. The ventilation time was 12.5 minutes.

[0018] Take 1L of the above-mentioned reaction slurry and filter and separate within 10 minutes. The separated filter cake is added to wash water and mixed for beating. 95°C, aging for 4 hours, stirring at 350 rpm. The filter cake was washed with distilled water at 90°C and dried in an oven at a temperature of 80°C to obtain pseudo-boehmite.

Embodiment 2

[0020] Take 1L of the reaction slurry in Example 1 and filter and separate within 10 minutes, add washing water to the separated filter cake and mix it for beating. , raised the temperature to 95°C, aged for 4 hours, and the stirring speed was 300 rpm. The filter cake was washed with distilled water at 90°C and dried in an oven at a temperature of 85°C to obtain pseudo-boehmite.

Embodiment 3

[0022] Get 1L of the reaction slurry of Example 1 and filter and separate within 20 minutes. The separated filter cake is added with washing water and mixed for beating. Warm to 95°C, age for 4 hours, and stir at 400 rpm. The filter cake was washed with distilled water at 92°C and dried in an oven at 90°C to obtain pseudo-boehmite.

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Abstract

The invention relates to a preparative method of pseudo-boehmite, belonging to the field of the preparative technology of alumina exclusive of metallurgical usage. The method comprises the steps as follows: sodium metaaluminate solution is carbonated into mucus, aging, separating, washing and drying. The invention is characterized in that after the sodium metaaluminate solution becomes mucus, pulp-liquid separation is carried out primarily; filter cake is added; heating and aging are performed after water washing and mixed pulping. The invention has the advantages of low washing water consumption, low production cost, easy control of product quality and good practicality.

Description

technical field [0001] The invention relates to a preparation method of pseudo-boehmite, which belongs to the preparation technology of non-metallurgical alumina. Background technique [0002] Pseudo-boehmite, the English name is Pseudoboehmite, and the Chinese translation includes pseudo-boehmite, pseudo-boehmite, and pseudo-boehmite. It is mainly used as a binder, catalyst and its carrier. It is used in the chemical alumina occupies an important position. [0003] The method of producing pseudo-boehmite is generally divided into aluminum alcohol hydrolysis method and neutralization method. The production of pseudo-boehmite by domestic sintering alumina plants mostly uses carbonic acid CO 2 The way the gas is neutralized. The technological process sequentially includes the carbonation of sodium metaaluminate solution to form gel, aging, separation, washing and drying. Due to the convenient source of raw materials, the by-products and waste liquids of the sintered alumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/14
Inventor 赵善雷赵言培马晓宁张浩张冰
Owner 中铝山东新材料有限公司
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