Preparation method of pseudoboehmite

A technique for pseudo-boehmite and water purification, which is applied in the field of pseudo-boehmite preparation, can solve the problems of affecting the washing effect, poor dense water permeability of the filter cake, uneven thickness distribution of the filter cake, etc. The effect of improving the stability of production quality and reducing the energy consumption of drying

Active Publication Date: 2018-11-30
ZIBO QIMAO CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual production process, when the aged slurry is washed with a belt filter, the filter cake has dense water permeability, uneven distribution of filter cake thickness, cracks in the filter cake, and poor local washing effect, which affects The overall washing effect, especially when the impurity content of the product is required to be low, it is difficult to wash the impurities inside the particles, and the amount of washing water will increase significantly, and the solid content of the filter cake produced by the belt filter is low, and the amount of water that needs to be evaporated per unit product High, high drying energy consumption

Method used

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  • Preparation method of pseudoboehmite

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Effect test

Embodiment 1

[0035] A preparation method of pseudo-boehmite, comprising the following steps:

[0036] Continuous co-flow feeding of NaAlO in the neutralization reactor 2 solution and Al 2 (SO 4 ) 3 solution for neutralization reaction, NaAlO 2 The concentration of the solution as alumina is 200g / L, the concentration of aluminum sulfate solution as alumina is 50g / L, the temperature of the neutralization reaction is 70°C, the pH of the neutralization slurry is 8.0, and the neutralization residence time is 15 minutes. The neutralized slurry is collected in an aging tank, and the stirring is continued, and the temperature is raised to 80° C. with steam, and the aging temperature is kept constant, and the aging time is 180 minutes. After the aging process, 0.6% of dried pseudo-boehmite was added and stirred for 25 minutes. The aged slurry is pumped into the belt filter, filtered to remove the mother liquor, and washed in a three-stage recycling cycle of washing water. The temperature of th...

Embodiment 2

[0041] Continuous co-flow feeding of NaAlO in the neutralization reactor 2 solution and Al 2 (SO 4 ) 3 solution for neutralization reaction, NaAlO 2 The concentration of the solution in terms of alumina is 200g / L, the concentration of the aluminum sulfate solution in terms of alumina is 60g / L, the temperature of the neutralization reaction is 75°C, the pH value of the neutralization slurry is 7.5, and the neutralization residence time is 20 minutes. The neutralized slurry is collected in an aging tank, and the stirring is continued, and the temperature is raised to 85° C. with steam, and the aging temperature is kept constant, and the aging time is 240 minutes. After the aging process, 1.5% of dried pseudo-boehmite was added and stirred for 20 minutes. The aged slurry is pumped into a belt filter, filtered to remove the mother liquor, and washed in a three-stage recycling cycle. The temperature of the washing water is 85°C, and the total washing time is 20 minutes: the thi...

Embodiment 3

[0045] Continuous co-flow feeding of NaAlO in the neutralization reactor 2 solution and Al 2 (SO 4 ) 3 solution for neutralization reaction, NaAlO 2The concentration of the solution in terms of alumina is 210g / L, the concentration of the aluminum sulfate solution in terms of alumina is 80g / L, the temperature of the neutralization reaction is 60°C, the pH of the neutralization slurry is 7.0, and the neutralization residence time is 25 minutes. The neutralized slurry is collected in an aging tank, and the stirring is continued, and the temperature is raised to 90° C. with steam, and the aging temperature is kept constant, and the aging time is 120 minutes. After the aging process, 2.5% of dried pseudo-boehmite was added and stirred for 20 minutes. The aged slurry is pumped into the belt filter, filtered to remove the mother liquor, and washed in a three-stage recycling cycle. The temperature of the washing water is 90°C, and the total washing time is 25 minutes: the third st...

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Abstract

The invention discloses a preparation method of pseudoboehmite. The whole process consists of neutralization, aging, washing and drying steps. The process is characterized in that: 0.5%-5% of dried pseudoboehmite is added at the end of aging, the washing process adopts a continuous belt filter and intermittent filter press two-stage combination process, the washing water amount is 10-30 times thatof the pseudoboehmite product, the solid content of a pseudoboehmite filter cake is in the range of 26.0%-35.0%, the washing water amount is reduced by 50% or more, the amount of water needing evaporation for unit product is reduced by 40% or more, and the energy consumption for drying is reduced by 40% or more. The process saves the washing water amount, reduces the energy consumption for dryingand makes the product quality more stable.

Description

technical field [0001] The invention relates to a method for preparing pseudo-boehmite, in particular to a method for preparing pseudo-boehmite by an aluminum sulfate-sodium metaaluminate method, which improves the water permeability of a filter cake formed during slurry filtration; At the same time, the washing process is a combination of continuous belt filter and intermittent filter press, which reduces the amount of washing water, increases the solid content of the filter cake, reduces drying energy consumption, and makes the product quality more stable. Background technique [0002] γ-Al 2 o 3 Alumina is widely used as a carrier in the field of oil refining catalysts, and the preparation of γ-Al 2 o 3 The method is to prepare its precursor pseudo-boehmite first, and then roast it at a certain temperature to convert it into γ-Al 2 o 3 . There are many methods for preparing pseudo-boehmite, mainly including aluminum alcohol hydrolysis and precipitation methods, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
CPCC01F7/141
Inventor 张凤韧王红彬宫钰田静孙鑫孙淑玲孙洪梅
Owner ZIBO QIMAO CATALYST
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