Micrometre grade thin diaspore preparation method

A boehmite and micron-scale technology is applied in the field of preparing micron-scale boehmite powder, and can solve the problems of low seed fraction of decomposed supersaturated sodium aluminate solution and low activity of boehmite crystal seeds, etc. Achieve the effect of low production cost, mild conditions and pure crystal phase

Inactive Publication Date: 2006-02-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome defects such as the low seed fraction of decomposing supersaturated sodium aluminate solution due to the low activity of boehmite seed crystals in the prior art, thereby providing a method using H 2 o 2 The solution is obtained by precipitating highly active boehmite seed crystals from sodium aluminate solution, and then using the boehmite seed crystals to prepare micron-sized boehmite powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, preparation boehmite seed crystal I

[0029] At 30°C, 240mL of 100g / L-Al 2 o 3 , causticization coefficient α K Sodium aluminate solution of 1.45 and 20.0% H 2 o 2 The solution was added dropwise at the same time, and the H 2 o 2 Solution drop rate is 7.4mL / min (feeding time 25.2min), H 2 o 2 and Al in solution 2 o 3 The molar ratio control is 5.0: 1.0.

[0030] The reaction slurry was aged for 1h under the same conditions as the reaction conditions, and then the solid was filtered out. The pH of the aged slurry filtrate was 11.45, and the Al in the solution 2 o 3 The precipitation rate is 97.4%. Wash with water at 40°C to neutral to remove OH in the aging product - and Na + , then disperse and wash once with ethanol twice the solid volume, to eliminate the hard agglomeration of the washed product due to wet water during the drying process, dry the filter cake in an oven at 80°C overnight, and analyze it by XRD as The boehmite phase, without ...

Embodiment 2

[0031] Embodiment 2, preparation boehmite seed crystal II

[0032] Under the condition of 0℃ and continuous stirring 300r / min, add 240mL 250g / L-Al 2 o 3 , causticization coefficient α K Add dropwise 30.0% H to the sodium aluminate solution of 3.50 2 o 2 Solution, the rate of addition is 14.0mL / min (feeding time 30.0min), H 2 o 2 and Al in solution 2 o 3 The mol ratio control is 7.0: 1.0.

[0033] The reaction slurry was aged for 0.5h under the same conditions as the reaction conditions, and then the solid was filtered out. The pH of the aged slurry filtrate was 13.26, and the Al in the solution 2 o 3 The precipitation rate is 63.2%, washed with water at 60°C to neutral to remove OH in the aged product - and Na + , then disperse and wash once with ethanol 3 times the solid volume, to eliminate the hard agglomeration of the washed product due to wet water during the drying process, dry the filter cake in an oven at 60°C overnight, and analyze it by XRD as The boehmit...

Embodiment 3

[0034] Embodiment 3, preparation boehmite seed crystal III

[0035] At 90°C, 240mL of 50g / L-Al 2 o 3 , causticization coefficient α K Sodium aluminate solution of 1.30 and 8.0% H 2 o 2 The solution is mixed in one go, H 2 o 2 and Al in solution 2 o 3 The molar ratio control is 3.0: 1.0.

[0036] The reaction slurry was aged for 2.0h under the same conditions as the reaction conditions, and then the solid was filtered out. The pH of the aged slurry filtrate was 12.42, and the Al in the solution 2 o 3 The precipitation rate is 78.3%, and it is washed to neutral with 80°C water to remove OH in the aging product - and Na + , then disperse and wash once with ethanol 5 times the solid volume, to eliminate the hard agglomeration of the washed product due to wet water during the drying process, dry the filter cake in an oven at 70°C overnight, and analyze it by XRD as The boehmite phase, without other diffraction peaks of aluminum hydroxide, is the boehmite seed crystal II...

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Abstract

The invention relates to preparation method for micron thin diaspore, which comprises steps: at 0~9Deg, using 8~30% H2O2 solution of 3.0~7.0 times to deposite the sodium aluminate solution contained 50~250g/L-Al2O3 with causticization coefficient alphaK 1.30~3.50; aging there action slurry, filtering, clearing, dispersing withethanol, and baking to prepare the thin diaspore crystal seed; adding the crystal seed into oversaturated sodium aluminate solution contained 50~250g/L-Al2O3 with alphaK 1.30~3.50, and obtaining the objective product. This method has high seed-separation rate of 50% or more, and needs mild reaction condition.

Description

technical field [0001] The invention relates to a preparation method of micron-sized boehmite, in particular to a method using H 2 o 2 The solution is obtained by precipitating highly active boehmite seed crystals from a sodium aluminate solution, and then using the boehmite seed crystals to prepare micron-sized boehmite powder. Background technique [0002] Boehmite (boehmite, also known as boehmite, boehmite) structure of aluminum hydroxide is the preparation of γ-Al 2 o 3 and α-Al 2 o 3 An important precursor of isocrystalline alumina, γ-Al 2 o 3 Has been widely used as catalyst carrier, catalyst and adsorbent, etc., and as the final stable product of calcination, α-Al 2 o 3 It is widely used in the fields of ceramics, electronic circuit substrate materials and structural materials. Therefore, the modern process industry requires a large number of boehmite and its derivative alumina powders with different pore size distributions, shapes and structures. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 蔡卫权李会泉张懿郑诗礼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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