Red mud unburned brick and preparation thereof

A technology of avoiding burning bricks and red mud, which is applied in the field of building materials, can solve the problems of increased viscosity of slag, unfavorable cement production, high energy consumption for dehydration, etc., and achieve the effect of reducing radioactive hazards

Inactive Publication Date: 2009-07-01
刘贵堂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the 1940s, many countries have proposed dozens of methods for the comprehensive utilization of red mud, but most of them have not met the requirements of industrial production, mainly because the red mud slurry is not easy to dry, and the dehydration consumes a lot of energy.
In addition, the high content of iron and alkali in this red mud is not conducive to the manufacture of cement
If

Method used

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  • Red mud unburned brick and preparation thereof
  • Red mud unburned brick and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1 Preparation of red mud non-burning brick

[0027] Take the components according to the following weights: dry red mud 8; fly ash 24, quartz sand (the particle size is controlled below 10 mm) 25, lime 8, gypsum 3, cement 1, magnesium sulfate 0.0002;

[0028] Crush the red mud to control the particle size to be less than 10mm; crush the gypsum into fine powder and pass through a 160-200 mesh sieve; crush the quartz sand to fine powder to control the particle size to be less than 10mm;

[0029] After mixing the red mud, fly ash, quartz sand, lime, gypsum and magnesium sulfate together, use a bucket elevator to lift it and then use a wheel mill to mix it evenly, aging, and then add cement and a certain amount of Stir evenly with water (control the water content between 10-15%), press to shape, spray water for curing at room temperature for 28 days, and get it.

Example Embodiment

[0030] Example 2 Preparation of red mud non-burning brick

[0031] Take each component according to the following weight: dry red mud 25; fly ash 30, crushed stone powder (the particle size is controlled below 10mm) 30, lime 12, gypsum 5, cement 3, magnesium sulfate 0.0005;

[0032] Crush the dry red mud to control the particle size to be less than 10mm; crush the gypsum into fine powder and pass through a 160-200 mesh sieve; crush the crushed stone powder to control the particle size to be less than 10mm;

[0033] After mixing the dry red mud, fly ash, crushed stone powder, lime, gypsum and magnesium sulfate, it is lifted by a bucket elevator and then stirred evenly by a wheel milling method, aging treatment, and then cement and a certain amount are added. After mixing a large amount of water (control the water content between 10-15%), stir evenly, press to form, keep the pressure at a steam pressure of 1.2Mpa for 4 hours, store for 7 days after steaming and leave the factory, re...

Example Embodiment

[0034] Example 3 Preparation of Red Mud Burn-free Brick

[0035] Take the components according to the following weights: dry red mud 3.5, wet red mud 21.5; fly ash 30, quartz sand (the particle size is controlled below 10mm) 30, lime 12, gypsum 5, cement 3, magnesium sulfate 0.0005;

[0036] Crush the red mud to control the particle size to be less than 10mm; crush the gypsum into fine powder and pass through a 160-200 mesh sieve; crush the crushed stone powder to fine powder to control the particle size to be less than 10mm;

[0037] After mixing the red mud, fly ash, crushed stone powder, lime, gypsum and magnesium sulfate, it is lifted by a bucket elevator and then stirred evenly by a wheel milling method, aging treatment, and then cement and a certain amount are added. After mixing a large amount of water (control the water content between 10-15%), stir evenly, press to form, keep the pressure at a steam pressure of 1.2Mpa for 4 hours, store for 7 days after steaming and leave...

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Abstract

The invention discloses a red mud baking-free brick and a preparation method thereof. The red mud baking-free brick mainly comprises the following components by weight portion: 5 to 30 portions of red mud, 20 to 30 portions of coal ash, 20 to 50 portions of quartz sand or crushed stone powder, 5 to 15 portions of lime, 2 to 8 portions of gypsum, and 0 to 3 portions of cement. Each property of the red mud baking-free brick accords with requirement, the compressive strength and the breaking strength of the red mud baking-free brick reach superior grades of the national standard, and other performance indexes accord with the requirements; and radioactive elements in the red mud are subjected to powerful attenuation and shielding in particular, so as to remarkably reduce radiological hazard in the brick. Moreover, a certain amount of magnesium sulphate is added into the red mud baking-free brick, so as to effectively neutralize large amount of free alkali in the red mud, and eliminate brick surface scumming phenomenon caused by the large amount of the free alkali in the red mud.

Description

technical field [0001] The invention relates to a building material, in particular to a red mud burn-free brick prepared mainly by using industrial solid waste-red mud which is discharged from bauxite after extracting alumina as a raw material, and a preparation method thereof, which belongs to building materials field. Background technique [0002] Red mud is an industrial solid waste discharged from the extraction of alumina from bauxite. Generally, it contains a large amount of iron oxide, and its appearance is similar to red soil, hence the name. For those with high aluminum content in bauxite, the Bayer method is used to smelt aluminum, and the red mud produced is called Bayer red mud; for those with low aluminum content in bauxite, the sintering method or the combination of sintering and Bayer method is used to smelt. Aluminum, the resulting red mud is called sintering red mud or combined red mud respectively. [0003] Physical properties of red mud: particle diamet...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B18/14C04B14/06C04B22/14
CPCC04B2103/0094C04B2103/601C04B2103/0012C04B28/10C04B28/14Y02W30/91C04B7/02C04B14/06C04B18/0409C04B18/08C04B20/0076C04B20/026C04B22/064C04B22/142C04B40/0032C04B40/0259C04B14/02C04B22/143
Inventor 刘贵堂
Owner 刘贵堂
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