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Method for preparing aluminum oxide powder by using waste aluminum

A technology of aluminum oxide powder and aluminum isopropoxide, which is applied in the field of preparing aluminum oxide powder from waste aluminum, can solve the problems of low purity of aluminum oxide powder, poor dissolution effect, low product yield, etc. The effect of high reaction, high utilization rate and high purity

Inactive Publication Date: 2018-05-15
安徽玉成光华铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is a method in which waste aluminum is made into alkoxide, then purified, hydrolyzed, dried, and roasted to make alumina powder, but in the prior art, there are many defects, such as when the waste aluminum is dissolved with alcohol It takes a long time and the effect of dissolution is poor; the purity of the obtained alumina powder is low, and the product yield is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing alumina powder from waste aluminum, comprising the following steps:

[0020] (1) After cleaning the collected scrap aluminum, put it into the alcohol modification solution, soak it for 30 minutes, chop it, then put it into isopropanol, add additives to it, and mix it evenly , after raising the temperature of the mixture to 86°C, heat preservation treatment until the waste aluminum fragments are no longer dissolved, the aluminum isopropoxide mixture is obtained, wherein the additive is made of the following components by weight: 7 parts of aluminum fluoride, acid 1 part of sodium pyrophosphate;

[0021] (2) Centrifuge the aluminum isopropoxide mixture prepared in step (1) at a speed of 3500r / min for 12 minutes, remove the precipitate, leave the supernatant, and then recrystallize the supernatant to obtain isopropoxide Alcohol aluminum solution;

[0022] (3) Then dilute the aluminum isopropoxide solution prepared in step (2) to 2 times with a poly...

Embodiment 2

[0030] A method for preparing alumina powder from waste aluminum, comprising the following steps:

[0031] (1) After cleaning the collected scrap aluminum, put it into the alcohol modification solution, soak it for 35 minutes, chop it, then put it into isopropanol, add additives to it, and mix it evenly , after raising the temperature of the mixture to 88°C, heat preservation treatment until the waste aluminum fragments are no longer dissolved, the aluminum isopropoxide mixture is obtained, wherein the additive is made of the following components by weight: 8 parts of aluminum fluoride, acid 1 part of sodium pyrophosphate;

[0032] (2) Centrifuge the aluminum isopropoxide mixture prepared in step (1) at a speed of 3800r / min for 14 minutes, remove the precipitate, leave the supernatant, and then recrystallize the supernatant to obtain isopropoxide Alcohol aluminum solution;

[0033] (3) Then dilute the aluminum isopropoxide solution prepared in step (2) to 2.5 times with a po...

Embodiment 3

[0041] A method for preparing alumina powder from waste aluminum, comprising the following steps:

[0042] (1) After cleaning the collected waste aluminum, put it into the alcohol modification solution, soak it for 40 minutes, chop it, then put it into isopropanol, add additives to it, and mix it evenly , after raising the temperature of the mixture to 89°C, heat preservation treatment, until the waste aluminum fragments are no longer dissolved, the aluminum isopropoxide mixture is obtained, wherein the additive is made of the following components by weight: 10 parts of aluminum fluoride, acid 2 parts of sodium pyrophosphate;

[0043] (2) Centrifuge the aluminum isopropoxide mixture prepared in step (1) at a speed of 4000r / min for 15 minutes, remove the precipitate, leave the supernatant, and then recrystallize the supernatant to obtain isopropoxide Alcohol aluminum solution;

[0044] (3) Then dilute the aluminum isopropoxide solution prepared in step (2) to 3 times with a p...

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Abstract

The invention discloses a method for preparing aluminum oxide powder by using waste aluminum. The method comprises the following operation steps that (1), collected waste aluminum is placed into alcohol modified liquid after being washed cleanly, then the waste aluminum is cut up and placed into isopropanol after being subjected to soaking treatment, an additive is added into the mixture and mixedto be even, the temperature of the mixture is increased to be 86-89 DEG C, heat preservation is conducted on the mixture, till the waste aluminum debris does not dissolve any more, and an aluminum isopropoxide mixture is prepared; (2) sediment is removed after the aluminum isopropoxide mixture is subjected to centrifugal treatment, liquid supernatant is left and subjected to recrystalization treatment, and an aluminum isopropoxide solution is prepared; and (3) the aluminum isopropoxide solution is diluted by twice to three times by adopting an polyethanolamine water solution, heat preservation is conducted on the aluminum isopropopxide solution and stirring is conducted continuously, the mixture is dried, and roasted, and aluminum oxide powder is prepared. The prepared aluminum oxide powder is high in purity, and the utilization rate of waste aluminum is high.

Description

technical field [0001] The invention belongs to the technical field of waste aluminum recycling, and in particular relates to a method for preparing alumina powder from waste aluminum. Background technique [0002] Aluminum scrap is a common name for recycled aluminum. After the recovered aluminum is pretreated, part of it will be cold-processed to turn it into powdered aluminum, and the other part will be recycled by means of heavy-media beneficiation or parabolic beneficiation. In the prior art, there is a method in which waste aluminum is made into alkoxide, then purified, hydrolyzed, dried, and roasted to make alumina powder, but in the prior art, there are many defects, such as when the waste aluminum is dissolved with alcohol It takes a long time, and the effect of dissolving is poor; the purity of the obtained alumina powder is low, and the product yield is low. Contents of the invention [0003] In order to solve the above technical problems, the present inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C01F7/42
CPCC01F7/30C01F7/42C01P2006/80
Inventor 何启华
Owner 安徽玉成光华铝业有限公司
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