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Method for producing braking-free brick from red mud and magnesium slag used as main materials by press shaping

A technology of pressing and forming unfired bricks, which is applied in the field of comprehensive utilization of resources and new building materials

Inactive Publication Date: 2012-01-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research and application of using red mud and magnesium slag with high moisture content as the main raw materials, using industrial solid waste as auxiliary materials (non-industrial raw materials), completely utilizing waste, and adopting compression molding technology to produce unburned bricks for construction has not yet been done. see the report

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  • Method for producing braking-free brick from red mud and magnesium slag used as main materials by press shaping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The red mud is the industrial waste of the sintering method, and the magnesium slag is the industrial waste discharged from the production of metal magnesium by the Pidgeon method in the silicon thermal reduction method, and the aggregate is SiO 2 +Al 2 o 3 =75% fluidized slag (solid waste from low calorific value coal used for fluidized fluidized furnace combustion to produce steam), and the added process water is tap water.

[0027] Magnesium slag pretreatment: Put the magnesium slag into a square basket without a top cover and with Φ3 small holes on each side. The square basket is placed on the maintenance trolley, and is sent to the steam curing kettle by the transfer vehicle, and is subjected to 0.8MPa saturated steam. Treat for 5 hours, cool naturally and grind into a powder with a sieve residue of less than 10% through a 0.083mm square hole sieve. Aggregate pretreatment: pass the boiling slag through a 15mm square hole sieve, and then crush the sieve residue fo...

Embodiment 2

[0032] The red mud used is the Bayer red mud, the magnesium slag is the industrial waste discharged from the Pidgeon method in the silicon thermal reduction method to produce metal magnesium, and the process water added is the reclaimed water recovered after domestic sewage treatment.

[0033] Magnesium slag pretreatment: put the magnesium slag into a square basket without a top cover and with Φ3 small holes on each side. The square basket is placed on the maintenance trolley, and is sent to the steam curing kettle by the transfer trolley, and 0.9MPa steam is introduced. Treat for 4 hours, cool naturally and grind into a powder with a sieve residue of less than 10% through a 0.083mm square hole sieve. Aggregate pretreatment: Pass boiling furnace slag and cinder through a 15mm square hole sieve, and the sieve residue is secondary crushed to make the proportion of aggregates with a particle size greater than 15mm less than 5%.

[0034] The mixing process after adjusting the wate...

Embodiment 3

[0039] Magnesium slag pretreatment: Put the magnesium slag into a square basket without a top cover and with Φ3 small holes on each side. The square basket is placed on the maintenance trolley, and is sent to the steam curing kettle by the transfer vehicle, and is treated by 1.0MPa steam. After 3 hours, cool naturally and grind into a powder with a 0.083mm square hole sieve with a balance of less than 10%. Aggregate pretreatment: The blast furnace slag aggregate is passed through a 15mm square hole sieve, and the sieve residue is subjected to secondary crushing, so that the proportion of aggregate with a particle size greater than 15mm is less than 5%.

[0040] According to the mass ratio of red mud: magnesium slag: blast furnace slag = 50:40:10, add process water to adjust the mass ratio of mixture to water to 100:28, and then mix, static pressure molding, stacking, steam curing, etc. Brick making process to obtain burn-free bricks.

[0041] The mixing process after adjustin...

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Abstract

The invention relates to a method for producing a braking-free brick from red mud and magnesium slag used as main materials by press shaping, belonging to the technical fields of resource comprehensive utilization and novel building materials. The method comprises the following steps: based on red mud and magnesium slag used as main raw materials and other industrial waste slag used as aggregate,mixing pretreated magnesium slag, aggregate and red mud according to a proper ratio to obtain a mixed material, adding water to the mixed material until the total water content of the mixed material reaches the requirement, mixing, carrying out static pressure shaping, stacking, curing with steam and carrying out other brick manufacturing processes to obtain the braking-free brick, wherein the mass ratio of red mud to magnesium slag to aggregate is (45-50):(35-40):(10-15), and the ratio of the mixed material to water is 100:(28-32). The method has the advantages that: 100% raw materials are industrial wastes, red mud can be used after simple sedimentation, no any valuable industrial raw materials are added in production processes, the curing mechanism is identical to the mechanism of building fly ash into blocks, the production process is simple, and the energy consumption is low; and the product has the characteristics of high strength, high carbonization coefficient, high softening coefficient, low water absorption rate, alternate moist and heat resistance, good frost resistance, no efflorescence and the like.

Description

technical field [0001] The invention relates to a method for producing unburned bricks by using red mud and magnesium slag, which belongs to the technical field of comprehensive utilization of 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, which is the main reason for the low utilization rate of red mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08
Inventor 夏举佩张召述任雪娇
Owner KUNMING UNIV OF SCI & TECH
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