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...