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A method and device for controlling the morphology of boehmite

A boehmite and morphology technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of inability to convert into products, environmental pollution, and increased production costs.

Active Publication Date: 2015-12-09
TAISHAN MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a method and device for regulating the morphology of boehmite, aiming at solving the deficiency of the method for regulating the morphology of boehmite provided by the prior art, and currently researchers generally use an aluminum salt as a raw material, and additionally add The additive method introduces irrelevant cations while regulating the morphology of boehmite. These irrelevant cationic elements cannot be converted into products and can only be discharged as waste, which brings environmental pollution and increased production costs.

Method used

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  • A method and device for controlling the morphology of boehmite
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Examples

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Embodiment 2

[0048] Example 2: First, pure Al will be analyzed 2 (SO 4 ) 3 ·18H 2 O, Al(NO 3 ) 3 ·9H 2 O was added to two containers, deionized water was added, and stirred on the magnetic stirrer 11 to dissolve it to prepare Al 3+ Transparent solutions with equal or unequal concentrations are marked as solution A and solution B; secondly, according to the anion molar ratio of 1:4.5, that is, SO 4 2- : NO 3 - =1:4.5, add it to the inner tank of the hydrothermal reactor 121 and mix, then add a certain amount of urea as a precipitant, the amount of urea added is to precipitate all Al 3+ 150% of the required theoretical demand, continue stirring for half an hour to obtain a transparent solution C; then, control the filling degree of solution C in the hydrothermal reactor 121 to 75%, seal the hydrothermal reactor 121, and place it In the electrothermal constant temperature blast drying box 122, the hydrothermal temperature is controlled at 150°C and reacted for 24 hours. After the reaction is over...

Embodiment 3

[0049] Example 3: First, pure Al will be analyzed 2 (SO 4 ) 3 ·18H 2 O, Al(NO 3 ) 3 ·9H 2 O was added to two containers, deionized water was added, and stirred on the magnetic stirrer 11 to dissolve it to prepare Al 3+ Transparent solutions with equal or unequal concentrations are marked as solution A and solution B; secondly, according to the anion molar ratio of 1:3, that is, SO 4 2- : NO 3 - =1:3, add it to the inner tank of the hydrothermal reactor 121 and mix, then add a certain amount of urea as a precipitant, the amount of urea added is to precipitate all Al 3+ 100% of the required theoretical demand, continue to stir for half an hour to obtain a transparent solution C; then, control the filling degree of solution C in the hydrothermal reactor 121 at 70%, seal the hydrothermal reactor 121, and place it In an electrothermal constant temperature blast drying box 122, the hydrothermal temperature is controlled at 180°C, and the reaction is 12 hours. After the reaction is over,...

Embodiment 4

[0050] Example 4: First, pure Al will be analyzed 2 (SO 4 ) 3 ·18H 2 O, AlCl 3 ·9H 2 O was added to two containers, deionized water was added, and stirred on the magnetic stirrer 11 to dissolve it to prepare Al 3+ Transparent solutions with equal or unequal concentrations are marked as solution A and solution B; secondly, according to the anion molar ratio of 1:18, that is, SO 4 2- : Cl - =1:18, add it to the inner tank of the hydrothermal reactor 121 and mix, then add a certain amount of urea as a precipitant, the amount of urea added is to precipitate all Al 3+ 125% of the required theoretical demand, continue stirring for half an hour to obtain a transparent solution C; then, control the filling degree of the solution C in the hydrothermal reactor 121 at 80%, seal the hydrothermal reactor 121, and place it In an electrothermal constant temperature blast drying box 122, the hydrothermal temperature is controlled at 120°C, and reacted for 24 hours. After the reaction, it is natur...

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Abstract

The invention belongs to the technical field of chemical production, and provides a method and a device for controlling the morphology of boehmite. The method comprises the following steps of: respectively dissolving two analytically pure aluminum salts in deionized water to prepare solutions; adding the two aluminum salt solutions into a hydrothermal reaction kettle according to a certain anion mole ratio, adding a certain amount of precipitant and controlling the filling factor of the mixed liquor in the hydrothermal reaction kettle within 67-80%; sealing the hydrothermal reaction kettle, controlling the hydrothermal temperature within 120-200 DEG C and reacting for 4-24h; centrifugally separating sediment products at a revolving speed of 4000rpm; respectively washing the sediment products by using deionized water and absolute ethyl alcohol; and placing in a vacuum drying oven of 80-100 DEG C to dry for 4-8h, so as to obtain boehmite superfine powder with different morphologies. The preparation of the boehmite superfine powder is finished in liquid phase at once, the raw materials are inexpensive and easy to get, no additive is needed, the morphology control method is simpler and more convenient, the after-treatment process is simple, and the product dispersion is even and the morphology change is rich.

Description

Technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method and a device for regulating the appearance of boehmite. Background technique [0002] Boehmite is also known as boehmite, and its English name is boehmite. Its appearance is white powder and its molecular formula is γ-AlOOH. The important application value of boehmite is the preparation of industrially versatile alumina powder after calcination. One of its outstanding advantages is that the morphology of boehmite remains unchanged before and after calcination, and the same morphology as boehmite can be easily obtained. Of alumina products. Second, because of the comparison of molecular structure, boehmite can be regarded as aluminum hydroxide (Al(OH) 3 ) A product that loses one molecule of water, so starting from boehmite, calcining to prepare alumina is significantly lower in energy consumption than the method of calcining aluminum hydroxide. In su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 吴秀勇
Owner TAISHAN MEDICAL UNIV
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