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Ultrafine aluminum hydroxide and preparation method and application thereof

A technology of ultra-fine aluminum hydroxide and sodium aluminate, applied in the field of aluminum hydroxide, can solve problems such as unfavorable industrial production, limited source of raw materials, large equipment investment, etc., and achieves convenient long-term recycling, green process technology, and production and operation. low cost effect

Active Publication Date: 2019-05-28
LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: the process route is long, the reaction of alcohol and aluminum must be carried out under anhydrous conditions, in addition, rectification and recovery of organic alcohol, membrane filtration of impurities and other processes are required, and the investment in equipment is large
Only β-Al(OH) can be used in this method 3 As a raw material, the source of raw materials is limited, which is not conducive to industrial production

Method used

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  • Ultrafine aluminum hydroxide and preparation method and application thereof
  • Ultrafine aluminum hydroxide and preparation method and application thereof
  • Ultrafine aluminum hydroxide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (1) Coarse particle Al(OH) 3 Mix with distilled water according to the mass ratio of 1:3, and use a ball mill to grind to obtain Al(OH) containing fine particles 3 The first slurry, fine particle Al(OH) 3 the D 501.05μm;

[0081] (2) Add the first slurry to α k 1.40, N k In the first supersaturated sodium aluminate solution of 172g / L, wherein, relative to 1L of supersaturated sodium aluminate solution, Al(OH) 3 The amount of the first slurry added is 3g; the seed crystals are decomposed at 30°C until the solid content is 80g / L;

[0082] (3) filter, wash the filter cake until the pH value is 9, obtain the seed filter cake;

[0083] (4) Mix the seed filter cake with distilled water at a mass ratio of 1:3, and use a ball mill to grind to obtain a mixture containing fine particles of Al(OH) 3 The second slurry, fine particle Al(OH) 3 the D 50 1.21μm;

[0084] (5) Add the second slurry dropwise to α k In the unsaturated sodium aluminate solution of 2.85, wherein, ...

Embodiment 2

[0088] (1) Coarse particle Al(OH) 3 Mix with distilled water at a mass ratio of 1:3, and use a ball mill to grind to obtain Al(OH) containing fine particles 3 The first slurry, fine particle Al(OH) 3 the D 50 0.79μm;

[0089] (2) Add the first slurry to α k 1.22, N k In the first supersaturated sodium aluminate solution of 205g / L, wherein, relative to 1L of supersaturated sodium aluminate solution, Al(OH) 3 The amount of the first slurry added is 4g; the seed crystals are decomposed at 40°C until the solid content is 110g / L;

[0090] (3) filter, wash the filter cake until the pH value is 8.5, obtain the seed filter cake;

[0091] (4) Mix the seed filter cake with distilled water at a mass ratio of 1:3, and use a ball mill to grind to obtain a mixture containing fine particles of Al(OH) 3 The second slurry, fine particle Al(OH) 3 the D 50 1.41 μm;

[0092] (5) Add the second slurry dropwise to α k In the unsaturated sodium aluminate solution of 3.55, wherein, relativ...

Embodiment 3

[0096] (1) Coarse particle Al(OH) 3 Mix with distilled water at a mass ratio of 1:3, and use a ball mill to grind to obtain Al(OH) containing fine particles 3 The first slurry, fine particle Al(OH) 3 the D 50 1.42μm;

[0097] (2) Add the first slurry to α k 1.31, N k In the first supersaturated sodium aluminate solution of 150g / L, wherein, relative to 1L of supersaturated sodium aluminate solution, Al(OH) 3 The amount of the first slurry added is 2g; the seed crystals are decomposed at 35°C until the solid content is 100g / L;

[0098] (3) filter, wash the filter cake until the pH value is 8.5, obtain the seed filter cake;

[0099] (4) Mix the seed filter cake with distilled water at a mass ratio of 1:3, and use a ball mill to grind to obtain a mixture containing fine particles of Al(OH) 3 The second slurry, fine particle Al(OH) 3 the D 50 0.79μm;

[0100] (5) Add the second slurry dropwise to α k In the unsaturated sodium aluminate solution of 2.95, wherein, relative...

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Abstract

The invention relates to the field of aluminum hydroxide, and discloses ultrafine aluminum hydroxide and a preparation method and application thereof. The method includes the steps that an Al(OH)3 seed filter cake is prepared by utilizing a high-Nk supersaturated sodium aluminate solution for seed precipitation, the seed filter cake is grinded and then used as an active seed precursor, after the active seed precursor is aged in an unsaturated sodium aluminate solution, the aged active seed precursor is added into a low-Nk supersaturated sodium aluminate solution for seed precipitation, and ultrafine aluminum hydroxide powder is obtained. According to the method, in the seed preparation process, no other ion is introduced, the raw materials are easy to obtain, decomposed slurry can be recycled for a long time, the production cost is low, no sewage is produced, and industrial production is easy; when the prepared ultrafine aluminum hydroxide is applied to modified plastic, the tensile property, melt index and volume resistivity of the modified plastic can be remarkably improved.

Description

technical field [0001] The invention relates to the field of aluminum hydroxide, in particular to a method for preparing ultrafine aluminum hydroxide, the ultrafine aluminum hydroxide prepared by the method and the application of the ultrafine aluminum hydroxide in modified plastics. Background technique [0002] The process of preparing ultra-fine aluminum hydroxide by Bayer method is a process by using active Al(OH) 3 Seed, induced Al(OH) in supersaturated sodium metaaluminate solution 3 The process of crystallization. During this process, active Al(OH) 3 The seed preparation method plays a vital role in the economy of the process operation and the performance of the product. The current seed preparation methods mainly include chemical neutralization methods, including carbon separation method, aluminum sulfate neutralization method, aluminum nitrate neutralization method, small Soda neutralization method, ammonia neutralization method, etc., organic alkoxide method and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 邓魁
Owner LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD
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