Method for producing boehmite by using washing liquor

A technology of pseudo-boehmite and lotion, which is applied in the field of producing pseudo-boehmite by using lotion, which can solve the problems affecting the balance of alumina production liquid, the large restriction of alumina production, and the impact on the output of finished alumina. , to achieve the effect of low production raw material cost, abundant raw material, and reduced production raw material cost

Inactive Publication Date: 2012-12-12
SHANXI ALUMINUM FACTORY TECH CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has high production costs, which affects the balance of alumina production liquid, and also affects the output of finished alumina. The production of pseudo-boehmite is greatly restricted by alumina production.

Method used

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  • Method for producing boehmite by using washing liquor

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Embodiment 1

[0024] A method for producing pseudo-boehmite by using alumina to produce washing liquid for washing red mud, comprising the following steps:

[0025] The first step: Alumina is produced as a washing solution for washing red mud (Al 2 o 3 Concentration (weight) is 35g / L, Na 2 O concentration (weight) is 30g / L) into the desiliconization tank, add 5g of red mud and 5g of lime per liter of washing liquid, stir evenly, heat up to 75°C with steam, and keep it warm for 1 hour for desilication;

[0026] Second step: when the desiliconization amount index reaches the requirement ≥ 400, the product after the above-mentioned desilication treatment is filtered to obtain the filtrate (Al 2 o 3 Concentration (weight) is 35g / L) and filter cake, and filter cake returns alumina production and carries out batching;

[0027] The third step: transport the above filtrate to the dilution tank to cool down, cool down to a temperature of 30°C, and then use alumina to produce CO 2 After the exha...

Embodiment 2

[0032] A method for producing pseudo-boehmite by using alumina to produce washing liquid for washing red mud, comprising the following steps:

[0033] The first step: Alumina is produced as a washing solution for washing red mud (Al 2 o 3 Concentration (weight) is 50g / L, Na 2 O concentration (weight) is 35g / L) into the desiliconization tank, add 25g red mud and 25g lime for each liter of washing liquid, stir evenly, heat up to 85°C with steam, and keep warm for 3 hours for desilication;

[0034] Second step: when the desiliconization amount index reaches the requirement ≥ 400, the product after the above-mentioned desilication treatment is filtered to obtain the filtrate (Al 2 o 3 Concentration (weight) is 50g / L) and filter cake, and filter cake returns alumina production and carries out batching;

[0035] Step 3: Transport the above filtrate to the dilution tank to cool down, cool down to a temperature of 45°C, and then use alumina to produce CO 2 After the exhaust gas i...

Embodiment 3

[0040] A method for producing pseudo-boehmite by using alumina to produce washing liquid for washing red mud, comprising the following steps:

[0041] The first step: Alumina is produced as a washing solution for washing red mud (Al 2 o 3 Concentration (weight) is 65g / L, Na 2 O concentration (weight) is 55g / L) into the desiliconization tank, add 35g red mud and 35g lime per liter of washing liquid, stir evenly, heat up to 95°C with steam, and keep warm for 1 hour for desiliconization;

[0042] Second step: when the desiliconization amount index reaches the requirement ≥ 400, the product after the above-mentioned desilication treatment is filtered to obtain the filtrate (Al 2 o 3 Concentration (weight) is 65g / L) and filter cake, and filter cake returns alumina production and carries out batching;

[0043] The third step: transport the above filtrate to the dilution tank to cool down, cool down to a temperature of 55°C, and then use alumina to produce CO2 After the exhaust g...

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Abstract

The application relates to a method for producing boehmite by using washing liquor from the production of washing red mud by alumina, which comprises the following steps: delivering washing liquor from the production of the washing red mud by alumina to a desilicication tank, and adding red mud and lime to perform desilicication; when a desilicication index is more than or equal to 400 as required, filtering the product of the desilicication, transferring filtrate to a diluting tank for cooling, cooling to 20 to 60 DEG C, performing carbonation gelatinizing by using 20 to 60 volume percent CO2 gas obtained by concentrating and enriching CO2 waste gas generated in the production of alumina as a precipitator; heating the gelatinized slurry to 70 to 100 DEG C, keeping the temperature for 1 to 6 hour and aging; and washing the aged slurry with washing equipment, filtering the aged slurry to obtain filtrate and filter cake, and drying the filter cake by using drying equipment to obtain powdery boehmite. The method has the advantages of low production raw material cost and rich raw material source, is favorable for alumina production liquid balance, improvement on finished alumina yield, reduction of Al2O3 content of red mud discharged to the outside and recovery of alumina CO2 waste gas and is in accordance with the national circulating economy and waste recycling principle. The product produced has high crystalline phase purity and high peptizing performance and can be used as a binder, a drier, a purifier, a catalyst, a catalyst carrier and the like.

Description

technical field [0001] This application uses alumina to produce the lotion for washing red mud to produce pseudo-boehmite. All alumina producers at home and abroad hope to use the lotion for washing red mud to produce pseudo-boehmite with high added value, high efficiency, and broad application prospects. . The method has the advantages of low production raw material cost and abundant raw material, which is beneficial to the balance of alumina production liquid, the improvement of the output of finished alumina, and the discharge of red mud containing Al. 2 o 3 Reduced, conducive to the recovery of alumina waste gas CO 2 , In line with the national circular economy, waste utilization principles. The production of pseudo-boehmite can reduce the cost of production raw materials, increase production capacity, good product quality, simple process and obvious effect. Background technique [0002] The preparation of traditional pseudo-boehmite is mainly based on the production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 郭万里卫海森武建青李教贾传宝郝芳云彭益云苏国勤樊平张秀秀丁彦军赵红霞
Owner SHANXI ALUMINUM FACTORY TECH CHEM
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