Method for preparing red alumina powder

A technology of alumina powder and aluminum hydroxide, applied in chemical instruments and methods, inorganic chemistry, aluminum compounds, etc., can solve the problems of complex process, difficult operation, long process, etc., and achieve uniform color and good crystal morphology Effect

Active Publication Date: 2006-05-24
ZHENGZHOU HICER HIGH TECH CERAMICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have problems such as long process, complex process, and difficult operation to varying degrees. It is a subject of research to find a new preparation method for red alumina powder.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using industrial aluminum hydroxide as raw material, 1000g of aluminum hydroxide and 10g of boric acid were first stirred and mixed, and calcined at 600°C for 1.5 hours in a muffle furnace to obtain the desired precursor. Take 500 g of the calcined precursor alumina, put it into a ball mill jar and grind it for 10 minutes. Then weigh 0.7 gram of manganese oxide, 5 gram of chromium oxide and mix evenly, then weigh 3 gram of boric acid, mix 5 gram of ammonium fluoride evenly and set aside. First mix the colorant and the ground precursor alumina in the three-dimensional mixer for 20 minutes, take it out, put the additive into a 1000ml beaker, add 50ml of tap water to dissolve, then add it evenly, stir evenly, and then put it in the oven Dry at 100°C for 2 hours, take it out, put it into a crucible, put it into a high-temperature furnace and calcinate at 1410°C for 2.5 hours, take it out and grind it to get red alumina powder.

Embodiment 2

[0024] Using industrial aluminum hydroxide as raw material, 1000g of aluminum hydroxide and 10g of boric acid were first stirred and mixed, and calcined at 500°C for 5 hours in a muffle furnace to obtain the required precursor. Take 500 g of the calcined precursor alumina, put it into a ball mill jar and grind it for 10 minutes. Then weigh 0.7 gram of manganese oxide, 5 gram of chromium oxide mix uniformly, then weigh 2.5 gram of boric acid, 10 gram of ammonium fluoride mix uniformly and set aside. First mix the colorant and the ground precursor alumina in the three-dimensional mixer for 20 minutes, take it out, put the additive into a 1000ml beaker, add 50ml of tap water to dissolve, then add it evenly, stir evenly, and then put it in the oven Dry at 100°C for 2 hours, take it out, put it into a crucible, put it into a high-temperature furnace and calcinate at 1050°C for 2.5 hours, take it out and grind it to get a weak red alumina powder.

Embodiment 3

[0026] Using industrial aluminum hydroxide as raw material, first mix 1000g of aluminum hydroxide with 5 grams of boric acid (stir and mix, and calcinate in a muffle furnace at 900°C for 1 hour to obtain the required precursor. Take 500g of calcined precursor alumina , put it into a ball mill tank and grind for 30 minutes. Then weigh 27.5 grams of chromium oxide and mix evenly, then weigh 3 grams of boric acid and 5 grams of ammonium fluoride and mix them evenly for later use. First oxidize the colorant and the ground precursor Mix the aluminum in the three-dimensional mixer for 20 minutes, take it out, put the additive into a 1000ml beaker, add 50ml of tap water to dissolve, then add it evenly, stir evenly, then put it in an oven and dry it at 100°C for 2 hours, take it out and put it in Put it into a crucible, put it into a high-temperature furnace for calcination at 1550°C for 2.5 hours, take it out and grind it to get a light red alumina powder.

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Abstract

The invention relates to a method for preparing red aluminum oxide powder, relating to a method for preparing aluminum oxide powder to be added into the paint, characterized in that the preparing course in turn includes: a. adding fluoride and/or boride in 0.5%-2% into aluminum hydroxide, mixing, burning and then crushing the mixture into aluminum oxide powder; b. adding one or several ones of the colorizing agents: manganese oxide, iron oxide, copper oxide, and chrome oxide into the aluminum oxide powder, then adding in one of fluoride, and boride or their mixture to mix uniformly and then drying, burning 2-6 hours at 1050 deg.C-1550 deg.C, and grinding into the red aluminum oxide. The invention obtains the uniformly mixed particles of aluminum oxide and colorizing agents and fully uses the characters of solid phase reaction and gas phase reaction. And the prepared red aluminum oxide powder is uniform-colored, nontoxic and harmless, and has good crystal appearance.

Description

technical field [0001] The invention relates to a preparation method of red alumina powder, which relates to a preparation method of alumina powder added in paint, in particular to a method of preparing red α-alumina powder by an adsorption method. Background technique [0002] α-alumina powder is a chemical formula Al 2 o 3 And the compound with α crystal phase has the characteristics of high strength, high hardness, wear resistance, high temperature resistance, oxidation resistance, good insulation, acid and alkali resistance, etc., and is widely used. Because red alumina powder is a combination of α-alumina and colorant, it has all the properties of α-alumina. At the same time, at high temperature, α-alumina combines with colorant to form a compound without any toxicity. There will be no danger to the human body. At present, the methods for preparing red alumina include the hydrolysis combination method of aluminum alcohol salt, the solution co-precipitation method, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/44
Inventor 李旺兴陈玮任光明李晋峰刘占伟马艳红
Owner ZHENGZHOU HICER HIGH TECH CERAMICS
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