Harmless treatment method of aluminum ash

Abstract

The invention discloses a harmless treatment method of aluminum ash, which comprises the following treatment steps: oxidation of active aluminum and aluminum alloy: calcining the aluminum ash at 750-1100 DEG C to oxidize the active aluminum and aluminum alloy in the aluminum ash and oxidize part of aluminum nitride in the aluminum ash; and secondary elimination of aluminum nitride: adding water and an oxidizing agent into the calcined aluminum ash, reacting the aluminum nitride in the aluminum ash with the water under the action of the oxidizing agent to generate aluminum hydroxide and nitrogen, and obtaining an aluminum ash suspension after the reaction. The aluminum element in the aluminum ash can be effectively recycled, harmful substances such as ammonia gas are not generated while flammable and explosive phenomena are avoided, the influence on the surrounding environment is effectively reduced, the aluminum ash can be efficiently treated, secondary pollution to the external environment is avoided, the aluminum ash can be effectively recycled and reused, and the requirements of green development are met.

Description

technical field [0001] The invention relates to the technical field of aluminum ash treatment, in particular to a harmless treatment method for aluminum ash. Background technique [0002] Aluminum ash is an inevitable product of smelting, and it is easy to cause dust, ammonia and other pollution to the environment. According to the "National Hazardous Waste List 2021", aluminum ash has been classified as hazardous waste. Aluminum ash is alkaline when it meets water, which will destroy the pH of the soil. Therefore, aluminum ash must be treated in a correct way to avoid polluting the environment. The aluminum content in aluminum ash slag accounts for 40-80%. The recycling of aluminum ash slag and the reuse of resources can not only effectively prevent environmental pollution, but also improve the economic benefits of the aluminum industry, which is of great importance to the sustainable development of economy and society. significance. [0003] The composition of aluminum a...

AI Technical Summary

Problems solved by technology

Among them, aluminum nitride is easily hydrolyzed when it meets water, producing ammonia gas with a pungent smell. A large amount of ammonia gas will cause certain harm to the human body and the environment; active aluminum is easy to react with water to generate hydrogen gas, which is colorless, odorless and flammable Easy to explode, it is a great hazard in industrial production

At present, the existing treatment of aluminum ash slag is to react the aluminum ash slag in the water environment, and the aluminum nitride meets water to produce ammonia gas, and then remove the ammonia gas and the ammonium salt produced, although this method can remove nitrogen However, in the water environment, the active aluminum in the aluminum ash and the aluminum alloy will react to produce a large amount of hydrogen, which is easy to cause combustion and explosion, which has seriously endangered the processing environment of the aluminum ash and easily caused safety hazards

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