A kind of preparation method of acicular alumina and alumina

A kind of alumina and needle-shaped technology, which is applied in the field of preparation of needle-shaped high-purity alumina, can solve the problems of not meeting the application requirements of high-purity ceramics and low purity, achieve small and uniform grain size, reduce particle agglomeration, prevent Add an uneven effect

Active Publication Date: 2017-04-12
SHENGNUO OPTOELECTRONICS TECH QH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent produces α-acicular alumina, the purity is low, not exceeding 99.9%, which does not meet the application requirements of high-purity ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 230kg of aluminum isopropoxide with a purity of 99.999% and dissolve it in 300L of isopropanol to prepare a solution. Mix 50.74kg of pure water with 280L of isopropanol and 3121mL of nitric acid to prepare a mixed solution; add 100L of isopropoxide to the reactor Propanol was used as the bottom solution, and the water bath was turned on to heat the temperature in the kettle to 75°C; the two solutions were added to the reaction kettle at a rate of 1.2L / min and 1L / min respectively, and the temperature in the kettle was kept at 75°C, and Stir continuously, aluminum isopropoxide molecules react with water molecules to form hydrated alumina nanoparticles; after the solution is added dropwise, continue to stir at 75°C for 30 minutes; then, filter the reacted mixture through a filter press to obtain hydrated aluminum oxide nanoparticles. Alumina filter cake, recovering isopropanol at the same time; then, put the hydrated alumina filter cake in a vacuum rake drying oven, a...

Embodiment 2

[0031] Weigh 300kg of liquid high-purity aluminum isopropoxide and dissolve it in 400L of isopropanol to prepare a solution, mix 74.12kg of pure water with 320L of isopropanol and 4178mL of nitric acid to prepare a mixed solution; add 200L of isopropanol to the reaction kettle As the bottom liquid, turn on the water bath and heat until the temperature in the kettle is 70°C; add the two solutions into the reaction kettle at a dropping rate of 2.0L / min and 1.5L / min respectively, keep the temperature in the kettle at 70°C, and continuously After stirring, aluminum isopropoxide molecules react with water molecules to form hydrated alumina nanoparticles; after the solution is added dropwise, continue to stir at 70°C for 30 minutes; then, filter the reacted mixture through a filter press to obtain hydrated alumina nanoparticles. aluminum filter cake, while recovering isopropanol; then, put the hydrated alumina filter cake in a vacuum rake drying oven, and dry it at 150°C until there ...

Embodiment 3

[0033] Weigh 420kg of liquid high-purity aluminum isopropoxide and dissolve it in 600L of isopropanol to make a solution, mix 118.18kg of pure water with 320L of isopropanol and 5400mL of nitric acid to make a mixed solution; add 200L of isopropanol to the reaction kettle Make the bottom solution, and turn on the water bath to heat the temperature in the kettle to 60°C; add the two solutions into the reaction kettle at a rate of 2.0L / min and 1.5L / min respectively, keep the temperature in the kettle at 60°C, and continuously After stirring, aluminum isopropoxide molecules react with water molecules to form hydrated alumina nanoparticles; after the solution is added dropwise, continue to stir at 60°C for 30 minutes; then, filter the reacted mixture through a filter press to obtain hydrated alumina nanoparticles. aluminum filter cake, while recovering isopropanol; then, put the hydrated alumina filter cake in a vacuum rake drying oven, and dry it at 100°C until there is no isoprop...

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Abstract

The invention discloses a preparation method for acicular alumina. The method comprises the following steps: with high-purity aluminum isopropoxide with a purity of 99.999% and pure water as raw materials, isopropanol as a solvent and nitric acid as a morphology conditioning agent, dissolving high-purity aluminum isopropoxide in isopropanol to prepare a solution and mixing pure water, isopropanol and nitric acid so as to prepare another solution; simultaneously adding the two solutions in isopropanol drop by drop and allowing aluminum isopropoxide molecules and water molecules to undergo a reaction so as to produce hydrated alumina; and then carrying out filtering, drying and roasting so as to obtain high-purity alumina powder with acicular crystal morphology and recycling isopropanol. The invention also discloses the acicular alumina prepared by using the method. The method provided by the invention has the characteristics of a controllable reaction speed, uniform reaction and easiness in operation; and the acicular alumina prepared by using the method can be applied to fields with special requirements on morphology.

Description

technical field [0001] The invention belongs to the technical field of alumina preparation with special structure and morphology, and specifically relates to a preparation method of needle-shaped high-purity alumina and alumina. Background technique [0002] Due to its high melting point, corrosion resistance, chemical stability, and high hardness, high-purity alumina is widely used in many fields such as artificial crystals, phosphors, ceramic coatings, machinery, and chemicals, especially on alumina ceramics. most applications. In recent years, with the rapid development of alumina ceramic related industries, higher requirements have been placed on the performance of alumina ceramics, and overcoming the brittleness of alumina ceramics has become a hot spot in the field of technical research. The morphology of high-purity alumina ceramic powder has an important influence on the performance of alumina ceramics, and the high-purity alumina with acicular grain morphology can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 范秀丽刘江华刘冠华
Owner SHENGNUO OPTOELECTRONICS TECH QH CO LTD
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