Preparation method for pseudo-boehmite

A technique of pseudo-boehmite and sodium aluminate, applied in the field of preparation of pseudo-boehmite, can solve the problems of prolonging the production cycle, the effect is not obvious, prolonging the pressing and blowing time, etc., and achieves low cost and obvious precipitation effect. Effect

Active Publication Date: 2010-03-10
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

[0006] In response to this problem, the measures currently adopted are: increasing the amount of washing water, increasing the washing temperature, increasing the stirring intensity and controlling the water content of the filter cake, etc., but it is not obvious from the effect of implementation. Increasing the washing temperature and increasing the stirring intensity will cause The cost will increase, and the control of low filter cake

Method used

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Examples

Experimental program
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Example Embodiment

[0018] The seed mother liquor and seed lotion used in the preparation method of pseudo-boehmite of the present invention are both obtained during the production process of Bayer process alumina.

[0019] Na 2 O T Equal to 100g / L, Al 2 O 3 Equal to 40g / L seed mother liquor, Na 2 O T Equal to 20g / L and Al 2 O 3 Seed lotion equal to 1g / L, Na 2 O T More than 100g / L, Al 2 O 3 Seed mother liquor greater than 40g / L, Na 2 O T More than 20g / L and Al 2 O 3 Seed lotion greater than 1g / L can also be used and the same results can be obtained.

[0020] Na 2 O T Indicates the total alkali concentration of sodium aluminate solution, calculated as sodium oxide.

[0021] The following examples use Na 2 O T Equal to 100g / L, Al 2 O 3 Equivalent to 40g / L seed mother liquor; Na 2 O T Equal to 20g / L and Al 2 O 3 The seed lotion equal to 1g / L is taken as an example to illustrate the preparation method of pseudo-boehmite of the present invention in detail.

[0022] The seed mother liquor and seed lotion are fi...

Example Embodiment

[0031] Example 1,

[0032] Al 2 O 3 The concentration is 105g / L, α ko =1.45 sodium aluminate solution 3L, add distilled water or deionized water to dilute to Al 2 O 3 The concentration is 45g / L, the temperature is cooled to 33-35°C, and the impurities are filtered and purified.

[0033] Add CO with a concentration of 35-38% into the above-treated sodium aluminate solution 2 The gas undergoes rapid carbonation into a slurry, and the aeration time is 12.5 minutes.

[0034] Take the above slurry 40m 3 The temperature of steam is directly raised to 85℃, according to the volume of slurry (m 3 ): the volume of seed mother liquor (m 3 )=1: (0.05-0.6) Add the filtered seed mother liquor at a temperature of 85°C and age for 3 hours. Finally, it is separated by filtration, and the filter cake is washed with distilled water at 90°C and dried in an oven at a temperature of 80°C to obtain pseudo-boehmite.

[0035] According to the slurry volume (m 3 ): the volume of seed mother liquor (m 3 )=1:0....

Example Embodiment

[0042] Example 2,

[0043] Al 2 O 3 The concentration is 105g / L, α ko =1.45 sodium aluminate solution 3L, add distilled water or deionized water to dilute to Al 2 O 3 The concentration is 45g / L, the temperature is cooled to 33-35°C, and the impurities are filtered and purified.

[0044] Add CO with a concentration of 35-38% into the above-treated sodium aluminate solution 2 The gas undergoes rapid carbonation into a slurry, and the aeration time is 12.5 minutes.

[0045] Take the above slurry 40m 3 The temperature of steam is directly raised to 85℃, according to the volume of slurry (m 3 ): Seed lotion volume (m 3 )=1:(0.1-0.9) Add the filtered seed lotion at a temperature of 85°C and age for 3 hours.

[0046] Finally, it is separated by filtration, and the filter cake is washed with distilled water at 90°C and dried in an oven at a temperature of 80°C to obtain pseudo-boehmite.

[0047] According to the slurry volume (m 3 ): Seed lotion volume (m 3 )=1:0.5 The pseudo-boehmite prepared...

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Abstract

The invention discloses a preparation method for pseudo-boehmite, which comprises the following steps: carbonizing sodium aluminate solution into grout heated up the grout to ageing temperature, aging, filtering, separating, washing and drying, wherein the method also comprises a step of: adding seed precipitation mother solution or seed precipitation cleansing solution into grout. The time for adding seed precipitation mother solution or seed precipitation cleansing solution is the time of heating the grout up to the ageing temperature or in the process of the grout aging. The preparation method for pseudo-boehmite can cause the water consumption of pseudo-boehmite to be reduced to 20 ton water per ton pseudo-boehmite, has very obvious water lowering effect; and indexes of pseudo-boehmitedoes not generate fundamental change.

Description

technical field [0001] The invention relates to a preparation method of pseudo-boehmite, in particular to a preparation method of pseudo-boehmite which reduces water consumption. Background technique [0002] Alumina is a white powder extracted from bauxite ore using various production methods. The Bayer process is the most widely used process for the production of alumina. The production process of Bayer process alumina mainly includes pre-desilication, dissolution process, red mud washing, filtration process, seed crystal decomposition process and aluminum hydroxide filtration washing, roasting and other main production processes. Bauxite, lime and lye are made into raw ore pulp in a certain proportion, and pre-desilication is carried out before the raw ore pulp enters the dissolution, and then the alumina hydrate in the ore is dissolved under high pressure to obtain sodium aluminate solution; After the sodium aluminate solution is washed and filtered through the red mud...

Claims

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Application Information

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IPC IPC(8): C01F7/14
Inventor 刘延东赵言培李鹏飞李卫涛王东
Owner 中铝山东新材料有限公司
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