Efficient hydrolytic recycling technology and device for AlN in aluminum ash

Abstract

The invention provides a high-efficiency AlN hydrolysis recovery process in aluminum ash, which is characterized in that: the aluminum ash produced by aluminum melting and casting is mixed with water according to the mass ratio to make a slurry, and reacted at normal temperature; the ammonia gas generated by the reaction passes through the air pump Pumped into the ammonia absorption tank to prepare ammonia water. The present invention also provides a high-efficiency AlN hydrolysis recycling device in aluminum ash, which includes an AlN hydrolysis device and an ammonia absorption device, and is characterized in that: the AlN hydrolysis device includes a reaction body and a mixing feeding device, and the feeding of the mixing feeding device The feed pipe extends into the reaction main body; the inside of the feed pipe is provided with a helical agitator, which is connected to a drive motor. The stucco is pushed into the reaction body, and the aluminum stucco falls into the reaction body from the corresponding aluminum stucco outlet, and is fed uniformly under the action of the swing motor, which is conducive to the full reaction of the material and the timely discharge of the ammonia gas from the reaction body.

Description

technical field [0001] The invention relates to the field of recycled aluminum technology and equipment, in particular to a high-efficiency aluminum ash hydrolysis recycling process and a device thereof. Background technique [0002] Aluminum ash (or aluminum ash slag) is a kind of slag produced in the process of primary aluminum production, aluminum alloy and waste aluminum recycling. Unlike slags from other heavy metal smelting, aluminum ash floats on the surface of the melt and appears as loose ash. According to statistics, for every 1000kg of aluminum produced, 25~50kg will be produced. Around 5 million tons are produced worldwide each year. With the increase of aluminum and aluminum alloy production, the generation of aluminum ash also increases. Therefore, the green recycling of aluminum ash has become a focus of attention. At present, the utilization of aluminum ash is basically just to recycle the metal aluminum. Most of the residual ash after the extraction of m...

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Problems solved by technology

In the secondary aluminum industry, people consider using this reaction to prepare ammonia water from AlN in aluminum ash. The patent document (201510625455.7) discloses that the process of producing ammonia from AlN in aluminum ash is "the aluminum ash produced by melting aluminum Sizing with water at a mass ratio of 1:1~1:10 to obtain pulp a, and the NH3 produced during the slurrying process is absorbed by the absorption tower to make ammonia water. However, it has been found through research that ammonia gas is generated by mixing aluminum ash and water. The process requires high-temperature induction. The higher the ind

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