Harmless treatment and recycling system for aluminum ash and working method thereof

Abstract

The invention discloses a harmless treatment and recycling system for aluminum ash. The harmless treatment and recycling system comprises a reaction device, a cooling circulation device, an ammonium sulfate generation device and a gas collection device which are sequentially connected, wherein the reaction device comprises a reaction kettle, a heating device and a stirring device; the cooling circulation device is arranged obliquely and upwards from the direction of the reaction device to the direction of the ammonium sulfate generation device; a sulfuric acid injection pipeline and an ammonium sulfate discharge pipeline are arranged at the lower end of the ammonium sulfate generation device, the sulfuric acid injection pipeline is connected with an external sulfuric acid storage device, and the ammonium sulfate discharge pipeline is connected with an external ammonium sulfate storage device; and a gas storage device comprises a first gas storage tank and a second gas storage tank. Theinvention further discloses a working method of the harmless treatment and recycling system for aluminum ash. According to the invention, ammonia gas and combustible gas generated in the treatment process are recycled while nitrogen and salt removal of aluminum ash is achieved, and the harmless treatment and recycling system is very important for related industries of harmless treatment and utilization of aluminum ash.

Description

technical field [0001] The invention belongs to the technical field of environmental protection devices, and relates to the field of systems and methods for processing aluminum ash, in particular to a harmless treatment and recycling system for aluminum ash and a working method thereof. Background technique [0002] Aluminum ash is the main by-product of electrolytic aluminum or cast aluminum production process, and the output is huge. Aluminum ash contains aluminum-containing compounds such as elemental aluminum, aluminum nitride, and aluminum carbide, as well as salts such as potassium chloride and sodium chloride. The contact of aluminum nitride with water will release the harmful gas ammonia, which will lead to the accumulation of aluminum ash and landfill to pollute the air. Elemental aluminum and aluminum carbide react with water to produce flammable gases hydrogen and methane, respectively, resulting in increased risk and waste of resources in the harmless treatment ...

AI Technical Summary

Problems solved by technology

Aluminum nitride water contact will release harmful gas ammonia, resulting in the accumulation of aluminum ash slag landfill polluting the air

Elemental aluminum and aluminum carbide react with water to produce flammable gases hydrogen and methane respectively, resulting in increased risk and waste of resources in the harmless treatment of aluminum ash slag

Potassium chloride, sodium chloride and other soluble salts cause aluminum ash to accumulate and pollute soil and groundwater during landfilling

[0003] At present, the harmless treatment devices and methods for aluminum ash slag are mainly aimed at the removal of soluble salts in aluminum ash slag and the recovery and utilization of ammonia gas generated during the treatment process, without considering the recovery and utilization of combustible gases such as hydrogen and methane during the treatment process, resulting in waste of energy

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