Method for harmlessly treating aluminum ash

Abstract

The invention discloses a method for harmlessly treating aluminum ash. The method comprises the following steps: (1) performing ball milling on aluminum ash to be treated in a ball mill to flattening metal aluminum in the aluminum ash into flat aluminum, and performing sieving to separate the flat aluminum from the aluminum ash to obtain first aluminum ash; (2) placing the first aluminum ash in a first container provided with an air vent, adding a first part of water into the first container, performing stirring to conduct reaction on aluminum nitride in the first aluminum ash and the water to generate ammonia and aluminum hydroxide, and discharging the ammonia through the air vent, to obtain a material left in the first container after the ammonia is discharged to be recorded as a first material; (3) performing iron removal operation on the first material, to obtain the first material subjected to iron removal to be recorded as a second material; (4) performing centrifugal dehydration operation on the second material, and then performing drying to obtain an oxide-containing mixture. According to the method, harmful substances and flammable and explosive substances in the aluminum ash are safely removed to implement harmless treatment and reclamation of the aluminum ash without heating.

Description

technical field [0001] The invention relates to the technical field of waste treatment in the metallurgical industry, in particular to a method for harmlessly treating aluminum ash. Background technique [0002] Aluminum ash is the product of the slag produced in the production process of electrolytic aluminum or cast aluminum after cooling and processing. During the refining process of aluminum, a lot of aluminum ash will be picked up. Aluminum ash contains a lot of ammonia and metal aluminum. Ammonia is a toxic substance, and metal aluminum is flammable and explosive. At the same time, the amount of aluminum ash produced by aluminum factories is very large. A large aluminum rod factory will produce thousands of tons of aluminum ash a year. If the aluminum ash is not handled properly, it will bring great harm, mainly including: [0003] 1) There are a lot of very fine metal aluminum in aluminum ash, which is very easy to cause combustion and explosion; [0004] 2) Alumin...

AI Technical Summary

Problems solved by technology

[0003] 1) There are a lot of very fine metal aluminum in aluminum ash, which is very easy to cause combustion and explosion;

[0004] 2) Aluminum ash contains a large amount of aluminum nitride (AlN), which will produce a large amount of ammonia NH when it meets water 3 , Ammonia gas is very toxic and corrosive, it will cause harm to the human body, animals and plants, and it will also pollute the soil and water sources

[0005] 3) Aluminum ash also contains a large amount of aluminum ions. If aluminum ions enter the soil and are absorbed by crops, or enter drinking water sources, it may harm the absorption of people who ingest the crops or water sources. Aluminum ions will have a negative impact on the nervous system of the human body. Great damage, severe will lead to Alzheimer's disease

Some aluminum ash factories have accumulated tens of thousands of tons of aluminum ash, but there is no solution, so they can only continue to squeeze and pile up, which wastes a lot of factory space and brings great safety hazards