Efficient hydrolytic recycling technology and device for AlN in aluminum ash

Abstract

The invention provides an efficient hydrolytic recycling technology for AlN in aluminum ash. The technology is characterized by comprising steps as follows: aluminum ash produced through aluminum casting and water are mixed in a mass proportion to be muddy, and a mixture is subjected to reaction at the normal temperature; ammonia gas produced through the reaction is pumped into an ammonia absorption tank through a gas pump for ammonia water preparation. The invention further provides an efficient hydrolytic recycling device for AlN in the aluminum ash. The device comprises an AlN hydrolysis device and an ammonia absorption device and is characterized in that the AlN hydrolysis device comprises a reaction main body and a mixed feeding device, and a feeding pipe of the mixed feeding device extends into the reaction main body; a spiral stirrer is arranged in the feeding pipe and connected with a drive motor, the aluminum ash and water are mixed by the spiral stirrer under the driving action of the drive motor, muddy aluminum mortar obtained through mixing is pushed into the reaction main body and falls into the reaction main body through a corresponding aluminum mortar outlet, uniform feeding is realized under the action of a swing motor, and sufficient reaction of the materials and timely discharging of the ammonia gas from the reaction main body are facilitated.

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 induction temperature, the shorter the induction time. The high-temperature induction period at 100°C requires more than 10 hours. The reaction time is longer, and the ammonia gas is volatile. The long-term reaction leads to a large amount of ammonia volatilization, and the obtained The low concentration of ammonia gas has become a difficult point in the hydrolysis and recycling process of AlN in aluminum ash. At the same time, ammonia gas is usually absorbed by an ammonia absorption tower to obtain ammonia water, and the ammonia absorption tower is bulky and requires a high height. In order to achieve the effect of absorption

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