Method and device for controlling morphology of boehmite

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

Active Publication Date: 2012-10-03
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,

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  • Method and device for controlling morphology of boehmite
  • Method and device for controlling morphology of boehmite

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Embodiment 2

[0048] Example 2: First, analytically pure Al 2 (SO 4 ) 3 18H 2 O, Al(NO 3 ) 3 9H 2 O was added to two containers respectively, deionized water was added, stirred on a magnetic stirrer 11 to dissolve it, and Al 3+ Transparent solutions with equal or different concentrations are marked as solution A and solution B respectively; secondly, according to the anion molar ratio of 1:4.5, that is, SO 4 2- : NO 3 - =1: 4.5, add in hydrothermal reactor 121 liner and mix, then add a certain amount of urea as precipitating agent, the addition of urea is to precipitate all Al 3+ 150% of the required theoretical demand, continue to stir for half an hour, and make a transparent solution C; then, control the filling degree of solution C in the hydrothermal reaction kettle 121 at 75%, seal the hydrothermal reaction kettle 121, and place it In the electrothermal constant temperature blast drying oven 122, control the hydrothermal temperature at 150°C, react for 24 hours, and cool to r...

Embodiment 3

[0049] Example 3: First, analytically pure Al 2 (SO 4 ) 3 18H 2 O, Al(NO 3 ) 3 9H 2 O was added to two containers respectively, deionized water was added, stirred on a magnetic stirrer 11 to dissolve it, and Al 3+ Transparent solutions with equal or different concentrations are marked as solution A and solution B respectively; secondly, according to the anion molar ratio of 1:3, that is, SO 4 2- : NO 3 - =1: 3, add in hydrothermal reactor 121 liner and mix, then add a certain amount of urea as precipitating agent, the addition of urea is to precipitate all Al 3+ 100% of the required theoretical demand, continue to stir for half an hour, and make a transparent solution C; then, control the filling degree of solution C in the hydrothermal reaction kettle 121 at 70%, seal the hydrothermal reaction kettle 121, and place it In the electrothermal constant temperature blast drying oven 122, control the hydrothermal temperature at 180°C, react for 12 hours, and naturally coo...

Embodiment 4

[0050] Example 4: First, the analytically pure Al 2 (SO 4 ) 3 18H 2 O, AlCl 3 9H 2 O was added to two containers respectively, deionized water was added, stirred on a magnetic stirrer 11 to dissolve it, and Al 3+ Transparent solutions with equal or different concentrations are marked as solution A and solution B respectively; secondly, according to the anion molar ratio of 1:18, that is, SO 4 2- :Cl - =1:18, add in hydrothermal reactor 121 liner and mix, then add a certain amount of urea as precipitating agent, the addition of urea is to precipitate all Al 3+ 125% of the required theoretical demand, continue to stir for half an hour, and make a transparent solution C; then, control the filling degree of solution C in the hydrothermal reaction kettle 121 at 80%, seal the hydrothermal reaction kettle 121, and place it In the electrothermal constant temperature blast drying oven 122, control the hydrothermal temperature at 120°C, react for 24 hours, and cool to room tempe...

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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 morphology of boehmite. Background technique [0002] Boehmite is also called boehmite, its English name is boehmite, its appearance is white powder, and its molecular formula is γ-AlOOH. The important application value of boehmite is to prepare alumina powder which is widely used in industry after calcination. alumina products. Second, due to the comparison of molecular structure, boehmite can be regarded as aluminum hydroxide (Al(OH) 3 ) loses a molecule of water, so starting from boehmite, calcined to prepare alumina, the energy consumption is significantly lower than that of calcined aluminum hydroxide. To sum up, the first preparation of boehmite with different shapes is a shortcut to finally obtain alumina powders with corresponding shapes. Therefore, boehmite is also called the precursor of alumina. [0...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 吴秀勇
Owner TAISHAN MEDICAL UNIV
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