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Production process for preparing superfine crystal alpha-aluminum oxide by directly using aluminum sulfate

A production process, the technology of aluminum sulfate, applied in the field of alumina production process, can solve the problems of inability to realize tiny crystallization, difficult control of technical conditions, strict production process requirements, etc., and achieve abundant raw material reserves, low production cost and simple production process Effect

Inactive Publication Date: 2012-11-28
孙志昂 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The finished product contains high sodium oxide impurities and is not easy to remove;
[0005] 2. Unable to achieve tiny crystallization, resulting in large particle size of the finished product;
[0006] 3. High production cost, which limits large-scale production;
[0007] 4. The production process is strict and the technical conditions are not easy to control

Method used

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  • Production process for preparing superfine crystal alpha-aluminum oxide by directly using aluminum sulfate
  • Production process for preparing superfine crystal alpha-aluminum oxide by directly using aluminum sulfate

Examples

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Effect test

Embodiment 1

[0025] The production process for producing ultra-fine crystal α-alumina directly from aluminum sulfate provided in this example includes the following steps:

[0026] (1) After pulverizing the aluminum sulfate, heat to remove the crystal water of the alumina intermediate, and the heating temperature is 300° C.;

[0027] (2) The product obtained in step (1) is sealed to remove sulfur in the desulfurization tunnel by means of electric heating, and the heating temperature is 800°C;

[0028] (3) The product obtained in step (2) is subjected to phase inversion calcining with natural gas in a high-temperature furnace, and the calcining temperature is 1300° C.;

[0029] (4) breaking and dispersing the product obtained in step (3);

[0030] (5) Recover the sulfur trioxide gas produced by desulfurization to make acid.

Embodiment 2

[0032] The production process for producing ultra-fine crystal α-alumina directly from aluminum sulfate provided in this example includes the following steps:

[0033] (1) After pulverizing aluminum sulfate, heat to remove attached water and crystal water, and the heating temperature is 400°C;

[0034] (2) The product obtained in step (1) is sealed to remove sulfur in the desulfurization tunnel by means of electric heating, and the heating temperature is 900°C;

[0035] (3) heating the product obtained in step (2) in a high-temperature furnace for phase-inversion calcination, and the calcination temperature is 1100° C.;

[0036] (4) breaking and dispersing the product obtained in step (3);

[0037] (5) Recover the sulfur trioxide gas produced by desulfurization to make acid.

Embodiment 3

[0039] The production process for producing ultra-fine crystal α-alumina directly from aluminum sulfate provided in this example includes the following steps:

[0040] (1) After aluminum sulfate is crushed, the attached water and crystal water are removed by heating, and the heating temperature is 600°C;

[0041] (2) The product obtained in step (1) is sealed to remove sulfur in the desulfurization tunnel by means of electric heating, and the heating temperature is 700°C;

[0042] (3) heating the product obtained in step (2) in a high-temperature furnace for phase-inversion calcination, and the calcination temperature is 1400° C.;

[0043] (4) breaking and dispersing the product obtained in step (3);

[0044] (5) Recover the sulfur trioxide gas produced by desulfurization to make acid.

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Abstract

The invention discloses a production technology for preparing superfine crystal alpha-alumina directly using aluminium sulphate. The production technology comprises: heating the crushed aluminium sulphate at 300-600 DEG C and removing attached water and crystal water; hermetically removing the sulfur content from the dehydrated product in a desulfurization tunnel in a mode of electric heating at 700-900 DEG C; heating the desulfurized product to phase-invertible calcination in the high-temperature furnace at 1100-1400 DEG C; finally crushing and dispersing the product to obtain superfine crystal alpha-alumina; and recovering the sulfur trioxide gas produced by desulfurization to prepare acid. The production technology of the invention has advantages of simple technique, low production cost, scale production, abundant material reserves and easily available materials. The product alpha-alumina crystal particle according to the invention is extremely fine and uniform with a natural superfine crystal particle size and a concentrative particle size distribution.

Description

technical field [0001] The invention relates to a production process of alumina, in particular to a production process of using aluminum sulfate to produce ultrafine crystal α-alumina. Background technique [0002] At this stage in my country, the production methods of ordinary alumina are mainly metallurgical alumina or aluminum hydroxide direct calcination method, and the production methods of high-purity ultra-fine special alumina include improved Bayer method, aluminum ammonium sulfate pyrolysis method, aluminum ammonium carbonate pyrolysis method, etc. . The principle of the improved Bayer method and the production of metallurgical alumina by the Bayer method are roughly the same, that is, high-purity aluminum hydroxide is obtained by using sodium aluminate solution for multiple times of desiliconization, iron removal, decomposition, and washing, and then high-purity ultrafine aluminum hydroxide is produced by high-temperature calcination. Aluminum; ammonium aluminum su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/32
Inventor 孙志昂贺广浩肖志业
Owner 孙志昂
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