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Preparation method of aluminum hydroxide gel and microlite alpha-Al2O3 aggregate

A technology of aluminum hydroxide gel and aluminum hydroxide, applied in the direction of aluminum hydroxide preparation, aluminum oxide/hydroxide preparation, ammonium nitrate, etc., can solve the complex process, uneven dispersion of sintering aids, impurities High content and other issues

Active Publication Date: 2012-12-05
SHANDONG UNIV
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Problems solved by technology

[0009] Currently commercially available aluminum hydroxide products have poor particle size uniformity, coarse particle size, low reactivity, and high impurity content
The sintering precursor is difficult to peptize, and the dispersion of sintering aids is uneven
Usually prepared by high temperature, high pressure or special sintering process, the process is complicated, requires high equipment and consumes a lot of energy, see J.Eur.Ceram.Soc.2010,30,1351; USP6395214; J.Am.Ceram.Soc.2002 ,85,1921

Method used

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  • Preparation method of aluminum hydroxide gel and microlite alpha-Al2O3 aggregate
  • Preparation method of aluminum hydroxide gel and microlite alpha-Al2O3 aggregate
  • Preparation method of aluminum hydroxide gel and microlite alpha-Al2O3 aggregate

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Embodiment Construction

[0013] A kind of aluminum hydroxide gel, wherein the aluminum hydroxide is amorphous, for preparing microcrystalline α-Al 2 O 3 Aggregates; were prepared as follows:

[0014] (1) NH with a concentration of 25 to 28 wt% 3 ·H 2 O is added to water and Al(NO 3 ) 3 ·9H 2 In the mixed solution of O, Al(NO 3 ) 3 ·9H 2 O:H 2 O:NH 3 ·H 2 The molar ratio of O is 1:(3-8):(4.5-12), and the suspension is obtained after stirring evenly; centrifugation or suction filtration is performed, and the precipitate is washed 2~3 times with deionized water to obtain aluminum hydroxide; the filtrate For the recovery of by-product ammonium nitrate.

[0015] (2) adding water to the aluminum hydroxide obtained in step (1) to prepare a suspension with a solid content of 5 to 15 wt %, and adding concentrated nitric acid with a concentration of 65 to 69 wt %; the molar ratio of the aluminum hydroxide to the concentrated nitric acid (5 -12): 1, stir for 2~5h, add alumina ball milling medium to ...

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Abstract

The invention relates to an aluminum hydroxide gel. The preparation method includes performing reaction of aluminum nitrate hydrate and ammonia water to obtain aluminum hydroxide, adding additive to suspension after ball-milling to obtain aluminum hydroxide gel, and drying to obtain aluminum hydroxide dried gel; and grinding and calcining the aluminum hydroxide dried gel to prepare microlite alpha-Al2O3 aggregate. The preparation method is suitable for large-scale production of the microlite alpha-Al2O3 aggregate, conditions of process are easy to control, grain size of primary grain of the prepared microlite alpha-Al2O3 aggregate is 50-400nm, particle size of secondary aggregate particle of the prepared microlite alpha-Al2O3 aggregate is 75-600um, the prepared microlite alpha-Al2O3 aggregate is compact in structure, density is 3.90-3.98g / cm<3>, and hardness is 19-24GPa. The prepared microlite alpha-Al2O3 aggregate can be used for abrasive, high-temperature-resistant material, electronic device material, high-frequency insulation material, aerospace material, information material and the like.

Description

technical field [0001] The invention relates to an aluminum hydroxide gel and the preparation of microcrystalline α-Al by using the aluminum hydroxide gel as a raw material 2 O 3 The aggregate material belongs to the field of inorganic non-metallic materials. Background technique [0002] Microcrystalline α-Al 2 O 3 Aggregate materials can be used in many basic industries and fields such as chemistry, insulating materials, catalyst carriers, ceramics, aerospace, electronics, etc., especially as ceramic materials are the most widely used. Microcrystalline α-Al 2 O 3 As an important ceramic material, aggregate has always been a research hotspot at home and abroad, especially the research and application of microcrystalline corundum abrasives, electronic ceramics and transparent ceramics, which have developed rapidly in recent years, are the most typical. [0003] α-Al since the 1980s 2 O 3 The preparation technology has developed rapidly. α-Al 2 O 3 It is usually ob...

Claims

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Application Information

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IPC IPC(8): C01F7/34C01F7/30C01C1/18
Inventor 陈代荣张建焦秀玲张立
Owner SHANDONG UNIV
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