Aluminum metal smelting slag reuse method

Abstract

The invention provides a recycling method for baghouse aluminum dust and aluminum metal smelting slag. The method comprises the following steps: processing slag particles from aluminum metal smelting slag; allowing the particle size of the slag particles to be greater than 200 meshes and less than 400 meshes; mixing slag particles according with conditions with an aqueous solution of a binder so as to form a blank material; pressurizing and molding the blank material to form a crude green body of a refractory material; and sintering the crude green body of the refractory material at an operating temperature of 1050 to 1450 DEG C and carrying out cooling so as to form the refractory material. Thus, the particle size of the slag particles can be controlled, nitrogen content in the slag particles is effectively reduced, and the phenomenon of escape of ammonia gas due to a reaction of water with aluminum nitride can be effectively reduced after mixing of the slag particles with the aqueous solution of the binder, so the phenomenon of cracking or explosion of the crude green body of the refractory material or the refractory material can be reduced, thereby achieving the effects of low making cost and good surface fineness of the refractory material.

Description

technical field [0001] The invention relates to a method for reusing aluminum metal smelting slag, in particular to a method that can control the particle size of slag particles to effectively reduce the nitrogen content of slag particles, and when the slag particles are mixed with an aqueous binder solution, the nitrogen content can be effectively reduced. The phenomenon of ammonia gas escaping due to the reaction of water and aluminum nitride can reduce the phenomenon of cracking or bursting of refractory rough embryos or refractory materials, and achieve the effect of low production cost and good surface fineness of refractory materials. Background technique [0002] The smelting process of aluminum will produce slag, which contains aluminum oxides and nitrides, among which the nitrides will react with moisture in the humid air or rainwater to form ammonia gas, so the untreated slag is harmful to the environment. a certain degree of influence. [0003] China Taiwan Inven...

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Problems solved by technology

[0008] 2. The nitrogen content of rough embryos in refractory bricks is high, and when wet, pungent ammonia gas will escape due to the following chemical reactions

[0010] 3. Even if the rough refractory material before sintering does not crack or burst, but during the high-temperature sintering process of the rough refractory material, the refractory brick will crack or burst due to high-temperature sintering

[0011] 4. The surface fineness of refractory bricks is not good (rough)

[0012] Exploring the reasons for the above-mentioned lack is mainly due to the manufacturing method disclosed by the research. The content of nitride (aluminum nitride) in the aluminum smelting slag is relatively high (about 9506ppm), because the research cannot effectively reduce the nitrogen content in the aluminum smelting slag. Therefore, the ammonia gas escape phenomenon caused by the nitrogen compound in the refractory rough embryo meeting the binder aqueous solution is the main cause of cracking or bursting of the refractory rough embryo

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