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...

Examples

Embodiment 1

[0026] Produce unburned bricks with red mud and magnesium slag as the main raw materials, and its components are red mud, magnesium slag, active mineral materials, and lime. The mass ratio of red mud to magnesium slag, active mineral material and lime is 45:40:10:5; the active mineral material is composed of blast furnace slag, yellow phosphorus slag and fly ash in a mass ratio of 3:3:4 .

[0027] see figure 1 , a method for producing unburned bricks by extruding red mud and magnesium slag as the main raw materials, which is to pretreat magnesium slag, active mineral materials and lime, and then according to the formula of red mud: magnesium slag: active mineral material: lime The mass percentage is 45:40:10:5, mixed with red mud to obtain a mixture, and tap water is added to the mixture, and the mass ratio of the material to water is adjusted to 100:35, and then stirred, mixed, extruded, and cut , static stop, stacking blanks, steam curing and other brick-making processes t...

Embodiment 2

[0033] Example 2 : To produce unfired bricks with red mud and magnesium slag as the main raw materials, and its components are red mud, magnesium slag, active mineral materials and lime. The mass ratio of red mud to magnesium slag, active mineral material, and lime is 45:35:15:5; the active mineral material is made of blast furnace slag and fly ash mixed at a mass ratio of 2:1.

[0034] see figure 1 , a method of extruding red mud and magnesium slag as the main raw materials to produce unburned bricks is to pretreat magnesium slag, active mineral materials and lime, and then press them into red mud: magnesium slag: active mineral material: The mass percentage of lime=45:35:15:5 is mixed to obtain a mixture, and middle water is added to the mixture, and the mass ratio of the material to water is adjusted to 100:33, and then mixed, extruded, cut, and statically stopped , stacking blanks, steam curing and other brick-making processes to obtain burn-free bricks.

[0035] The r...

Embodiment 3

[0039] Example 3: Produce unburned bricks with red mud and magnesium slag as the main raw materials, and its components are red mud, magnesium slag, fly ash and lime. The mass percentage of red mud, magnesium slag, fly ash and lime is 45:40:13:2.

[0040] see figure 1 , a method for producing unburned bricks by extruding red mud and magnesium slag as the main raw materials. First, the magnesium slag is thermally activated and then mixed with lime in proportion for aging. 8% powder, then mix the material according to the mass ratio of red mud: magnesium slag: fly ash: lime is 45:40:13:2, add tap water to the mixture, and adjust the mass ratio of material to water to 100: 32. After brick making processes such as stirring and mixing, extrusion, cutting, static stopping, billet stacking, and steam curing, unburned bricks are obtained.

[0041] The red mud used is the industrial waste slag in the alumina production process of the hybrid method (it can be used directly without t...

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...

Examples

Embodiment 1

[0026] Produce unburned bricks with red mud and magnesium slag as the main raw materials, and its components are red mud, magnesium slag, active mineral materials, and lime. The mass ratio of red mud to magnesium slag, active mineral material and lime is 45:40:10:5; the active mineral material is composed of blast furnace slag, yellow phosphorus slag and fly ash in a mass ratio of 3:3:4 .

[0027] see figure 1 , a method for producing unburned bricks by extruding red mud and magnesium slag as the main raw materials, which is to pretreat magnesium slag, active mineral materials and lime, and then according to the formula of red mud: magnesium slag: active mineral material: lime The mass percentage is 45:40:10:5, mixed with red mud to obtain a mixture, and tap water is added to the mixture, and the mass ratio of the material to water is adjusted to 100:35, and then stirred, mixed, extruded, and cut , static stop, stacking blanks, steam curing and other brick-making processes t...

Embodiment 2

[0033] Example 2 : To produce unfired bricks with red mud and magnesium slag as the main raw materials, and its components are red mud, magnesium slag, active mineral materials and lime. The mass ratio of red mud to magnesium slag, active mineral material, and lime is 45:35:15:5; the active mineral material is made of blast furnace slag and fly ash mixed at a mass ratio of 2:1.

[0034] see figure 1 , a method of extruding red mud and magnesium slag as the main raw materials to produce unburned bricks is to pretreat magnesium slag, active mineral materials and lime, and then press them into red mud: magnesium slag: active mineral material: The mass percentage of lime=45:35:15:5 is mixed to obtain a mixture, and middle water is added to the mixture, and the mass ratio of the material to water is adjusted to 100:33, and then mixed, extruded, cut, and statically stopped , stacking blanks, steam curing and other brick-making processes to obtain burn-free bricks.

[0035] The r...

Embodiment 3

[0039] Example 3: Produce unburned bricks with red mud and magnesium slag as the main raw materials, and its components are red mud, magnesium slag, fly ash and lime. The mass percentage of red mud, magnesium slag, fly ash and lime is 45:40:13:2.

[0040] see figure 1 , a method for producing unburned bricks by extruding red mud and magnesium slag as the main raw materials. First, the magnesium slag is thermally activated and then mixed with lime in proportion for aging. 8% powder, then mix the material according to the mass ratio of red mud: magnesium slag: fly ash: lime is 45:40:13:2, add tap water to the mixture, and adjust the mass ratio of material to water to 100: 32. After brick making processes such as stirring and mixing, extrusion, cutting, static stopping, billet stacking, and steam curing, unburned bricks are obtained.

[0041] The red mud used is the industrial waste slag in the alumina production process of the hybrid method (it can be used directly without t...

Images