Treatment method of secondary aluminum ash

Abstract

The invention discloses a treatment method of secondary aluminum ash. The method comprises the following steps of: step 1, weighing one part of secondary aluminum ash, 3 parts of 98% concentrated sulfuric acid and 5-6 parts of ammonium bicarbonate according to process requirements, and respectively placing the weighed raw materials; 2, pouring the treated aluminum ash into diluted sulfuric acid for reaction to prepare an aluminum sulfate solution; 3, adding the aluminum sulfate solution into the ammonium bicarbonate solution to react with ammonium; 4, after adding the aluminum sulfate solution, continuously stirring for 15-20 minutes, stopping stirring, performing still standing, precipitating and filtering; step 5, cleaning the residual solution on the surface of a solid precipitate filtered in the step 4, and then drying by drying equipment to remove excessive moisture to obtain aluminum carbonate amine particles; and 6, feeding the dried aluminum carbonate amine particles into a high-temperature kiln, and calcining the particles for 1-1.5 hours to obtain the nanoscale aluminum oxide powder. By means of the method, the recycling rate of the aluminum element in the secondary aluminum ash in the product can be increased, and the final product is alpha-type aluminum oxide with a regular crystal form.

Description

technical field [0001] The invention relates to the field of resource recovery, in particular to a treatment method for secondary aluminum ash. Background technique [0002] Secondary aluminum ash is the ash produced in the recycling process of waste aluminum that cannot be directly used. It is rich in aluminum oxide and various other impurities. It is difficult to directly recycle through metallurgical methods. Generally, it can only be directly used as refractory bricks, etc. The raw material of the material wastes a lot of aluminum resources virtually. The content of elemental aluminum in the actual secondary ash is generally about 10%, while the total content of alumina and aluminum nitride is as high as 40%~60%. In order to make full use of the aluminum in the secondary aluminum ash, people have developed in practice The acid leaching method extracts the aluminum element in the ash in the form of salt, but the commonly used acid leaching method produces a lot of ammoni...

AI Technical Summary

Problems solved by technology

[0002] Secondary aluminum ash is the ash produced in the recycling process of waste aluminum that cannot be directly used. It is rich in aluminum oxide and various other impurities. It is difficult to directly recycle through metallurgical methods. Generally, it can only be directly used as refractory bricks, etc. The raw material of the material wastes a lot of aluminum resources virtually

The content of elemental aluminum in the actual secondary ash is generally about 10%, while the total content of alumina and aluminum nitride is as high as 40%~60%. In order to make full use of the aluminum in the secondary aluminum ash, people have developed in practice Acid leaching, the aluminum element in the ash is leached in the form of salt, but the commonly used acid leaching method produces a lot of ammonia gas when treating secondary aluminum ash, and the purity of the final product Al2O3 is not high