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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 moisture will inevitably prolong the pressing and blowing time, which will reduce the utilization rate of the equipment and prolong the production cycle
Increasing the amount of washing water will inevitably use a large amount of washing water, which will enter the grafted alumina industrial production system, destroy the water balance in the alumina production system, increase evaporation costs and waste water, and also cause cost increases

Method used

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Examples

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preparation example Construction

[0018] The seed separation mother liquor and the seed separation washing liquid used in the preparation method of the pseudo-boehmite of the present invention are all obtained in the production process of Bayer process alumina.

[0019] Na 2 o T Equal to 100g / L, Al 2 o 3 Equivalent to 40g / L seed fraction mother liquor, Na 2 o T Equal to 20g / L and Al 2 o 3 Equal to 1g / L seed washing solution, Na 2 o T More than 100g / L, Al 2 o 3 More than 40g / L seed separation mother liquor, Na 2 o T More than 20g / L and Al 2 o 3 Sub-washes greater than 1 g / L can also be used with the same results.

[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 Equal to 40g / L seed fraction mother liquor; Na 2 o T Equal to 20g / L and Al 2 o 3 The seed washing solution equal to 1g / L is taken as an example to illustrate the preparation method of the pseu...

Embodiment 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 removed by filtration and purification.

[0033] Into the above-mentioned treated sodium aluminate solution, the concentration of 35-38% CO 2 The gas was rapidly carbonated into a slurry with an aeration time of 12.5 minutes.

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

[0035] In the above method, according to the volume of slurry (m 3 ): th...

Embodiment 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 removed by filtration and purification.

[0044] Into the above-mentioned treated sodium aluminate solution, the concentration of 35-38% CO 2 The gas was rapidly carbonated into a slurry with an aeration time of 12.5 minutes.

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

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

[0047] In the above method, according to the volume of slurry (m 3 ): V...

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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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