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Preparation method of super-purity aluminum oxide

A technology of alumina and aluminum sulfate, applied in the preparation of alumina/hydroxide, etc., can solve the problems of difficult to popularize and use, complex and harsh operating conditions, and large differences in main content.

Inactive Publication Date: 2012-09-26
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these methods have problems such as complex process flow, complex and harsh operating conditions, many types of raw materials involved, large differences in main content, vastly different impurity components, high energy consumption for solution heating, and the need to purchase special equipment, which leads to large investment in production equipment and high product costs. , it is difficult to promote and use in the current industrial production at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 1000g of 18-water industrial aluminum sulfate into deionized water, heat slowly under constant stirring to dissolve it, reach 85°C, concentrate the solution to a specific gravity of 1.35g / L, filter after cooling, crystallize and dry, and remove impurities after the filtrate settles overnight recycle.

[0018] Dissolve 100g of industrial superior-grade ammonium sulfate in deionized water, dissolve it under constant stirring, and filter to remove mechanical impurities to obtain a clarified filtrate.

[0019] Dissolve the dried crystalline aluminum sulfate with deionized water, slowly add ammonium sulfate solution under constant stirring, and add 5g of tartaric acid to 95°C, continue heating to keep the solution temperature constant, and filter while hot when crystals are about to precipitate. Concentrate the filtrate, cool and crystallize, dry the crystals and then recrystallize twice, and recover the mother liquor for reuse. Take 150 g of recrystallized aluminum amm...

Embodiment 2

[0023] Add 1000g of 18-water industrial aluminum sulfate into deionized water, heat slowly under constant stirring to dissolve it, reach 95°C, filter the concentrated solution after cooling, crystallize and dry, and filter the filtrate after 20 hours of sedimentation to remove impurities and clear the upper layer with a Buchner funnel recycle.

[0024] Dissolve 100g of industrial superior-grade ammonium sulfate in deionized water, dissolve it under constant stirring, and filter to remove mechanical impurities to obtain a clarified filtrate.

[0025] Dissolve the dried crystalline aluminum sulfate with deionized water, slowly add ammonium sulfate solution under constant stirring, and add 8g of tartaric acid to 85°C, continue heating to keep the solution temperature constant, and filter while hot when crystals are about to precipitate. Concentrate the filtrate, cool and crystallize, dry the crystals and then recrystallize twice, and recover the mother liquor for reuse. Take 150...

Embodiment 3

[0029] Add 1500g of 18-water industrial aluminum sulfate into deionized water, slowly heat it under constant stirring to dissolve it, to 95°C, filter the concentrated solution after cooling, crystallize and dry, and remove impurities after the filtrate settles for 20 hours for recycling.

[0030] Dissolve 120g of industrial grade ammonium sulfate in deionized water, dissolve it under constant stirring, and filter to remove mechanical impurities to obtain a clarified filtrate.

[0031] Dissolve the dried crystalline aluminum sulfate with deionized water, slowly add ammonium sulfate solution under constant stirring, and add 6g of citric acid and other organic acids at 95°C, continue heating to keep the solution temperature constant, and wait until the crystals are about to precipitate. filter. Concentrate the filtrate, cool and crystallize, dry the crystals and then recrystallize twice, and recover the mother liquor for reuse.

[0032] Take 100g of recrystallized aluminum ammon...

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Abstract

The invention discloses a preparation method of a super-purity aluminum oxide, characterized by comprising the specific process steps as follows: (1) dissolving an industrial aluminum sulfate, stirring and heating to 60-95 DEG C, cooling concentrated solution, filtering, crystallizing and drying, removing impurity from filtrate, and recycling; (2) dissolving industrial senior ammonium sulfate in deionized water, and filtering to obtain clarified filtrate; (3) dissolving the dried crystallized aluminum sulfate solution, adding the ammonium sulfate while stirring continuously, then adding ammonium tartrate, heating the solution, filtering when the solution is hot and the crystal is to be separated out, concentrating the filtrate, cooling and crystallizing, recrystallizing for twice, and recycling the mother solution for reuse; (4) adding the deionized water to dissolve the recrystallized aluminum ammonium sulfate, filtering, adding hydrochloric acid until aluminum trichloride is completely separated out; crystallizing and drying, using the hydrochloric acid to wash the surface of the crystal; and (5) placing the high-purity AlCl3 in a muffle furnace to burn for 3-6 hours at 550-800 DEG C, crushing, grinding, and sieving to obtain the high-purity aluminum oxide powder.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic material alumina powder, which is a preparation method of ultra-pure alumina, and involves the reaction of aluminum ammonium sulfate solution prepared by adding ammonium sulfate, tartaric acid and other organic substances to purified industrial aluminum sulfate and hydrochloric acid , to produce high-purity alumina. The production process of the method is simple, and the obtained alumina has high purity, which can reach 99.9999% spectral purity. Background technique [0002] Alumina is a widely used inorganic non-metallic material. Ordinary alumina is obtained from the bauxite smelting process, and its purity is low, which cannot meet the process requirements in many applications. Ultra-pure alumina has the advantages of high purity, fine particle size, uniform particle size distribution, etc. It shows optical, electrical, magnetic, thermal and mechanical properties superior to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30
Inventor 孙春晖于海斌陈永生刘伟许岩
Owner CHINA NAT OFFSHORE OIL CORP