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Method for preparing high-purity alumina by virtue of methylamine method

A high-purity alumina and aluminum methylamide technology, which is applied in the preparation of alumina/hydroxide, etc., can solve the problems of serious environmental pollution, difficulty in obtaining high-purity products, and poor economic benefits

Inactive Publication Date: 2014-03-26
韩香娟
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Problems solved by technology

[0004] Chinese patent document 95103368.9 and Chinese patent document 95105843.6 relate to a kind of salting out method to produce high-purity alumina, and its disadvantage is serious environmental pollution, and it is difficult to obtain high-purity products
Economic benefit is poor
In addition, since the choline used in this method can only be converted from choline chloride through a strong anion exchange resin, it is bound to bring chloride ions into the product, thereby affecting product quality.
However, in order to reduce the residual amount of chloride ions, a large amount of pure water washing is required, which increases water consumption and production costs.

Method used

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Examples

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Effect test

Embodiment Construction

[0015] Take 20g of high-purity aluminum foil with a thickness of 0.3mm, put it into a 2L polytetrafluoroethylene beaker, and add 500mL of 12mol / L methylamine aqueous solution. React in a water bath at 80°C for 5 hours under stirring with a plastic stirring paddle. At this time, most of the high-purity aluminum foil has been converted into aluminum hydroxide precipitation. Use a 50-mesh sieve to remove unreacted aluminum foil residue, dry and weigh the aluminum foil residue About 1g, put the obtained aluminum hydroxide precipitate into the washing tank, wash with pure water for 3 minutes, collect the aluminum hydroxide obtained after washing, put it into a low-sodium corundum crucible, dry it in an oven at 110°C for 24 hours, and then put it in Calcined in a muffle furnace at 1200°C for 2 hours to obtain 36g of high-purity alumina with a percentage above 99.999%.

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Abstract

The invention provides a method for preparing high-purity alumina by virtue of a methylamine method. The method is characterized by preparing methylaminated aluminium through reaction between methylamine and high-purity aluminium, hydrolyzing methylaminated aluminium to generate aluminium hydroxide and methylamine and preparing high-purity alumina by carrying out filtration, washing, drying, calcination, grinding and the like on generated aluminium hydroxide. The method has the prominent advantages of high product purity, simple process, low cost, zero emission and the like. High-purity alumina prepared by the method is suitable for the fields of LED (light emitting diode) long sapphire crystals, laser crystals, transparent ceramics, sodium lamp tubes and the like.

Description

technical field [0001] The invention relates to a method for preparing high-purity alumina by reacting methylamine and high-purity aluminum. technical background [0002] High-purity alumina is mainly used in LED sapphire long crystals, laser crystals, transparent ceramics, sodium lamps and other fields. High-purity alumina generally refers to alumina with a purity ≥ 99.99%, and sulfide chlorides also have a serious impact on its quality. [0003] At present, there are mainly the following methods for preparing high-purity alumina: [0004] Chinese patent document 95103368.9 and Chinese patent document 95105843.6 relate to a salting-out method for producing high-purity alumina, which has the disadvantages of serious environmental pollution and difficulty in obtaining high-purity products. [0005] Chinese patent document 91111373.8 and Chinese patent document 97103240.8 relate to a method for producing high-purity alumina by hydrolysis of low-carbon aluminum alcohols. Thi...

Claims

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Application Information

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IPC IPC(8): C01F7/42
Inventor 韩香娟
Owner 韩香娟
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