Method for producing baking-free brick mainly from red mud and magnesium slag by extrusion molding

Abstract

The invention relates to a method for producing burn-free bricks by utilizing red mud and magnesium slag, and belongs to the technical field of comprehensive utilization of solid waste resources and new building materials. Unburned bricks are produced by raw material pretreatment, grinding, metering, initial mixing, forced mixing, extrusion, cutting, steam curing and other processes. Red mud: magnesium slag: active mineral materials (blast furnace slag, yellow phosphorus slag, fly ash): the mass ratio of lime is 45-50: 35-40: 10-15: 2-5; the mass ratio of batch material to water is :100:32~35. Active mineral materials can be used alone or mixed and matched. The moisture content of the red mud in the ingredients of the present invention can be as high as 65% or more, and the traditional vacuum extruder can be used for raw and bad production. The operation is simple, the product is easy to build, the green body hardens quickly, the static maintenance time is short, and the occupied space is small. Low energy consumption. The product has high strength, high carbonation coefficient, high softening coefficient, low water absorption, alternating humidity and heat resistance, good frost resistance, and no efflorescence.

Description

technical field [0001] The invention relates to a method for producing unfired bricks through extrusion molding of red mud and magnesium slag as main raw materials, and belongs to the technical field of comprehensive utilization of industrial solid waste resources and new building materials. Background technique [0002] Red mud is the solid waste discharged during the alumina production process. According to the different alumina production processes, it is divided into sintering method, Bayer method and mixed method red mud. Due to the different alumina production methods and bauxite quality, the chemical composition, physical properties and mineral phases of red mud are different, but because of the high iron oxide content, its appearance color is similar to laterite, so it is generally called red mud. Regardless of sintering red mud or Bayer red mud, their common characteristics are alkali. Due to the existence of alkali, the utilization of red mud is very difficult, whi...

AI Technical Summary

Problems solved by technology

[0009] Judging from the overall situation of the utilization of red mud and magnesium slag at home and abroad, it is mainly concentrated on the production of cement or road materials with red mud or magnesium slag as the main raw material or auxiliary raw materials, combined with fly ash, slag, industrial gypsum, etc. , the production of various new wall materials has also been reported in a small amount, but the research and application of extrusion molding technology to produce building unburned bricks with red mud and magnesium slag as the main raw materials have not yet been reported.

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