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Preparation method of high-temperature-resistant boehmite

A boehmite and high-temperature-resistant technology, which is applied in the field of high-temperature-resistant boehmite preparation, can solve the problems of few relevant materials, and achieve the effects of high chemical purity, low production cost and large production capacity

Active Publication Date: 2016-08-10
中铝山东有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, the preparation method of high temperature resistant boehmite has very little relevant information

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of a high-temperature-resistant boehmite provided in Example 1 of the present invention is as follows: take 0.7 kg of soda lime sintered aluminum hydroxide and 0.3 kg of ρ-alumina, stir the slurry with 2.5 kg of distilled water to make the slurry uniform, and the aluminum-containing compound The liquid-solid ratio of the slurry to the hydration slurry is 2.5, after adding seeding agent 0.5kg of amorphous aluminum glue (water content 65%), and 5g of ammonium carbonate detergent builder, the pH of the slurry is about 7.5, and put it into an autoclave , control the speed of 1.5°C / min to rise to 180°C, and keep warm for 2.5 hours. After cooling down, filter and separate, wash with distilled water, and dry in an oven at 180°C. The boehmite conversion rate of the product is 98%, the 1% dehydration temperature is 381° C., and the electrical conductivity is 24 μs / cm.

Embodiment 2

[0028] The preparation method of a kind of high-temperature-resistant boehmite provided by Example 2 of the present invention is as follows: take 0.5 kg of soda lime sintered aluminum hydroxide and 0.5 kg of Bayerite, stir the slurry with 1.5 kg of high-purity water, and mix the aluminum-containing compound and The slurry liquid-solid ratio of the hydration slurry is 1.5, after adding seeding agent 0.4kg boehmite (water content 50%), and after 50g ammonium carbonate detergent builder, the slurry pH is about 11.5, packs in the autoclave, controls Raise to 190°C at a rate of 1.5°C / min and hold for 2 hours. After cooling down, filter and separate, wash with high-purity water, and dry in an oven at 150°C. The boehmite conversion rate of the product is 97.5%, the 1% dehydration temperature is 352°C, and the electrical conductivity is 20 μs / cm.

Embodiment 3

[0030] The preparation method of a kind of high-temperature-resistant boehmite provided by Example 3 of the present invention is as follows: take 1.0 kg of Bayerite, stir the slurry with 2.5 kg of deionized water to make the slurry uniform, and the slurry liquid-solid ratio of the aluminum-containing compound to the hydration slurry 2.5, after adding seeding agent 0.25kg alumina sol (water content 80%) and 10g ammonium bicarbonate detergent builder, the pH of the slurry is about 8, put it into an autoclave, and control the speed of 1.8°C / min to rise to 198 ℃, keep warm for 3 hours. After cooling down, filter and separate, wash with deionized water, and dry at 198°C in a spray dryer. The boehmite conversion rate of the product is 98.5%, the 1% dehydration temperature is 358°C, and the electrical conductivity is 20 μs / cm.

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Abstract

The invention discloses a preparation method of high-temperature-resistant boehmite. The preparation method includes the steps of: slurrying an aluminum compound with water with addition of a crystal seeding agent and a washing additive, uniformly mixing the components and feeding the mixture into a high-pressure kettle, controlling the temperature increasing rate at 1-3 DEG C / min, and performing a reaction at 150-250 DEG C for 2-6 h, decreasing the temperature, and separating, washing and drying a product to obtain the high-temperature-resistant boehmite. The preparation method is simple and has high yield and low production cost. The boehmite is high in conversion rate, has concentrated particle distribution, is more than 350 DEG C in 1% dehydration temperature, has high chemical purity and is not more than 25 [mu]S / cm in electric conductivity.

Description

technical field [0001] The invention relates to the technical field of material preparation and synthesis, in particular to a method for preparing high-temperature-resistant boehmite. Background technique [0002] Boehmite, also known as boehmite, boehmite, etc., has the chemical formula AlOOH or Al 2 o 3 ·H 2 O, insoluble in water, hardly soluble in acid and alkali, its powder has a very wide application value. [0003] The preparation method of boehmite has been reported in many patent documents at home and abroad. For example, the boehmite described in US4797139 is formed by the method of seeding treatment, and is limited to the boehmite particles that are suitable for forming alumina abrasives. Within the range, it has a particularly desirable spherical shape, making it suitable for grinding applications; R. Ball discloses a seeded boehmite particle material and its preparation method in the publication number CN 1942398A, pointing out that it is provided in the form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
CPCC01F7/02
Inventor 李广战张丽王智锦李鹏飞秦烟莱
Owner 中铝山东有限公司
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