Denitrfying agent and method for desulfurizing and denitrating refractory bricks by using denitrfying agent

Abstract

The embodiment of the invention relates to the technical field of aluminum ash hazardous waste treatment, in particular to a denitrifying agent and a method for desulfurizing and denitrifying refractory bricks by using the denitrifying agent, and the denitrifying agent comprises the following components in percentage by weight: 95%-99% of aluminum ash powder and 1%-5% of an adhesive; the denitrifying agent is prepared by the following steps: grinding primary aluminum ash by a ball mill, and screening the ground aluminum ash by a screening machine to obtain a secondary aluminum ash powder raw material; adding the secondary aluminum ash powder raw material and the binder into a double-shaft stirrer according to the mixing amount, and performing uniform stirring and mixing to obtain a uniformly mixed material; and conveying the uniformly mixed material to a forming machine for agglomeration operation to obtain a denitration agent lump material. The denitration agent is used for carrying out deamination treatment on the aluminum ash, nitrogen in the aluminum ash is converted into ammonia gas to be recycled, other types of aluminum elements are prepared into aluminum oxide powder to berecycled, and harmlessness, resource utilization and benefit of aluminum ash treatment are achieved; the flue gas of the refractory brick is efficiently purified by roasting the denitrifying agent andthe refractory brick together.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of aluminum ash hazardous waste treatment, in particular to a denitration agent and a method for desulfurization and denitrification of refractory bricks. Background technique [0002] Aluminum ash is produced in the process of melting all aluminum in the electrolytic aluminum, cast aluminum and recycled aluminum industries. According to incomplete statistics, the production of aluminum ash in my country is about 3 million tons per year. Aluminum ash is rich in aluminum and alumina materials, and its utilization value is very high. According to the number of times aluminum ash is used in the recycling process and the content of metallic aluminum, aluminum ash includes primary aluminum ash, secondary aluminum ash and tertiary aluminum ash. The main difference lies in the content of aluminum and aluminum oxides. The existing The recovery process includes frying ash recovery method, p...

AI Technical Summary

Problems solved by technology

In addition to aluminum and aluminum oxides that are easy to recycle, secondary aluminum ash or tertiary aluminum ash also contains a certain amount of active components of aluminum nitride and aluminum carbide, oxides such as Si, Mg, and Fe, K, Na, etc. Chloride; active components such as aluminum nitride and aluminum carbide react with water to produce flammable and toxic gases; soluble salts can cause soil salinization and crop death; some traces of fluoride and heavy metals have leaching toxicity and can cause water pollution

Secondary aluminum ash or tertiary aluminum ash is difficult to deal with due to its complex composition. Most enterprises adopt landfill or stockpiling for disposal. Secondary aluminum ash can easily cause serious secondary environmental pollution around the enterprise or around the storage site. Even cause the surrounding vegetation and crops to be barren

The existing harmless treatment process of aluminum ash mainly adopts the wet process, which consumes a lot of water in the process of denitrification and desulfurization in aluminum ash, the process is long, the energy consumption is large, and the waste is difficult to use efficiently The problem

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