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Preparation method of porous red mud cement brick

A technology of cement bricks and red mud, which is applied in the field of preparation of building materials, can solve the problems of low and low utilization rate of red mud, and achieve the effects of high utilization rate, short maintenance time and strong sound insulation performance

Inactive Publication Date: 2014-03-05
苏州负碳谷材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the shortcoming that the doping of red mud on the market is still seldom and the utilization rate of red mud is not high, the invention provides a preparation method of porous red mud cement brick

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: The preparation method of the porous red mud cement brick is made of 30% red mud, 20% sandstone, 20% limestone, and 4% iron powder to make a raw slurry. After adjusting to meet the technical indicators, use the inflow After most of the water is removed in the evaporator, it is directly sprayed into the rotary kiln to burn the cement clinker at a temperature of 1400-1450 ° C. The clinker is mixed with 20% of blast furnace slag and 10% of gypsum in the cement mill and ground to To a certain fineness, add water and stir the above mixture and add 10% straw powder, mix and grind, injection mold, oscillate, shape, and air-dry, and then put the air-dried bricks into the kiln for calcination at 300-400°C for 30-100 minutes. The curing pressure is 0.08-0.12Mpa, and the curing time is 48h-72h to obtain the required red mud cement brick.

Embodiment 2

[0008] Example 2: The preparation method of the porous red mud cement brick is made of 40% red mud, 30% sandstone, 50% limestone, and 2%-5% iron powder to make raw slurry, and adjust it to meet the technical indicators After most of the water is removed in the evaporator by the inflow method, it is directly sprayed into the rotary kiln to burn the cement clinker at a temperature of 1400-1450 ° C. The clinker is mixed with 30% of blast furnace slag and 20% of gypsum in a cement mill. Grind to a certain fineness, add water and stir the above mixture and add 20% straw powder, mix and grind, injection mold, vibrate, shape, air-dry, and then put the air-dried bricks into the kiln for calcination at 300-400°C for 30-100 minutes , the curing pressure is 0.08-0.12Mpa, and the curing time is 48h-72h to obtain the required red mud cement brick.

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Abstract

The invention relates to a preparation method of a porous red mud cement brick, which comprises the following steps: grinding 30-50% of red mud, 20-30% of sandstone, 20-40% of limestone and 4-10% of iron powder into a raw slurry, regulating until the raw slurry conforms to the technical indexes, removing most water by an inflow process with an evaporator, directly spraying into a rotary kiln, firing into cement clinker at 1400-1450 DEG C, carrying mix grinding on the clinker, 20-30% of blast furnace grain slag and 10-20% of gypsum in a cement grinder to a certain fineness, adding water into the mixture, stirring, adding 10-20% of straw powder, grinding, injecting into a mold, oscillating, molding, airing, calcining the aired brick in the kiln for 30-100 minutes, and curing under the pressure of 0.08-0.12 Mpa for 48-72 hours to obtain the required red mud cement brick. The method has the advantages of high utilization ratio of industrial waste residue, low cost, short maintenance time and low curing conditions.

Description

technical field [0001] The invention relates to a method for preparing building materials, in particular to a method for preparing porous red mud cement bricks. Background technique [0002] At present, red mud is the polluting waste slag discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 1.0-2.0 tons of red mud is incidentally produced. As the world's fourth largest producer of alumina, China discharges millions of tons of red mud every year. A large amount of red mud cannot be fully and effectively utilized, and can only be stacked in a large area of ​​storage yard, which occupies a large amount of land and causes serious pollution to the environment. The red mud produced in the world is about 70 million tons every year, and the red mud produced in my country is more than 30 million tons every year. The production of a large amount of red mud has caused direct and indirect impacts on human production and life in many a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B28/14C04B7/14
CPCY02P40/10
Inventor 孟繁茂
Owner 苏州负碳谷材料科技有限公司
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