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Production method of high-purity aluminum oxide

A high-purity alumina and production method technology, applied in the direction of alumina/hydroxide, etc., can solve the problems of lengthening the production cycle and increasing production costs, and achieve the effects of low cost, simple production process, and easy control of purity

Inactive Publication Date: 2013-08-14
GUIYANG YIJINGXIANG PHOTOELECTRIC TECH
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Problems solved by technology

But the production cycle is lengthened, which increases the production cost

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  • Production method of high-purity aluminum oxide

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Embodiment Construction

[0041] The technical scheme of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments:

[0042] Please refer to figure 1 , the present invention provides a production method of high-purity alumina, comprising a high-purity alumina production system and a tail gas collection system, comprising the following steps:

[0043] S1, prepare aluminum ammonium sulfate:

[0044] First put aluminum hydroxide and 98% sulfuric acid into the reactor, and add the ammonium sulfate solution of the tail gas collection system and the sulfuric acid of the tail gas collection system into the reactor as supplementary acid and supplementary water to react together to produce aluminum sulfate and aluminum sulfate The mixed solution of ammonium; after being filtered through the filter cloth, it enters the aluminum ammonium sulfate reactor for reaction; the mixed solution is in the aluminum ammonium sulfate reactor, suppleme...

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Abstract

The invention discloses a production method of high-purity aluminum oxide. The production method comprises the steps of preparing aluminum ammonium sulfate, recrystallizing the aluminum ammonium sulfate, producing high-purity aluminum oxide, collecting tail gas and regenerating ammonium sulfate, i.e., firstly preparing the aluminum ammonium sulfate from aluminum hydroxide and sulfuric acid; secondly, recrystallizing the aluminum ammonium sulfate to prepare high-purity aluminum ammonium sulfate; thirdly, implementing low-temperature dehydration and intermediate-temperature decomposition calcination to produce gamma-Al2O3; decomposing and removing all ammonia gas, sulfur trioxide and water vapour; finally, grinding the gamma-Al2O3, screening the ground gamma-Al2O3, molding and pressing the screened gamma-Al2O3 by a molding press, and sintering the gamma-Al2O3 by a high temperature furnace, thereby obtaining alpha-Al2O3. In the whole production process, the tail gas is collected effectively and the waste gas is recycled effectively. The production method of the high-purity aluminum oxide is simple in production technology, free from pollution and low in cost; and the purity of the high-purity aluminum oxide is easy to control.

Description

technical field [0001] The invention relates to a production method of alumina, in particular to a production method of high-purity alumina. Background technique [0002] High-purity alumina is white, easy to disperse, stable chemical properties, moderate high-temperature shrinkage, good sintering performance; high conversion rate, low sodium content, is the basic raw material for the production of heat-resistant, wear-resistant, corrosion-resistant products, such as high Aluminum refractory materials, high-strength ceramic products, automotive spark plugs, advanced abrasive materials and other products are of reliable quality, with high melting point, good thermal stability, high hardness, good wear resistance, high mechanical strength, good electrical insulation, and corrosion resistance. It is widely used for mirror polishing of stereotyped and unshaped refractories, refractory castable binders, wear-resistant abrasives, high-purity refractory fibers, special ceramics, el...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 季泳
Owner GUIYANG YIJINGXIANG PHOTOELECTRIC TECH
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