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Terracotta brick and preparation method thereof

A technology of clay bricks and clay, applied in the production of clay products, other household utensils, ceramic materials, etc., can solve the problems of cultivated land, farmland, vegetation damage, low calorific value that cannot be directly used, and clay bricks cannot be obtained, etc., to achieve sintering time Effect of shortening, low production cost and weight reduction

Inactive Publication Date: 2019-05-31
西安煤科动力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These tailings are used for power generation in power plants, and the calorific value is too low to be directly used; open-air stacking pollutes the environment, and landfills waste resources. If the brick factory prepares fired bricks, it still contains a large amount of calorific value that exceeds the brick-making requirements by many times. Sintered at 1150°C, the shrinkage rate is large, which can lead to the deformation of the stacking height during sintering, and the collapse of the brick body, and it is impossible to obtain clay bricks that meet the performance of the national standard.
If it is used as an additive to prepare clay bricks, its amount is limited, accounting for no more than 30%, and there is still a large amount of coal slime that cannot be used
[0003] Clay bricks are mainly used in city squares, municipal engineering, garden streets, high-end buildings, etc. Traditional clay bricks usually use high-quality clay or even purple sand clay for firing, which requires The mining of clay resources will cause the destruction of cultivated land, farmland and vegetation. Moreover, the clay resources are becoming increasingly exhausted, and the sintering of clay bricks is subject to the corresponding constraints of resources.

Method used

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  • Terracotta brick and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The raw material of the clay brick is composed of tailings and clay; the mass percentage of the tailings is 70%, and the mass percentage of the clay is 30%; The mass percentage of each component in the mine is: SiO 2 62%, Al 2 o3 17%, Fe 2 o 3 5%, CaO 2%, MgO 2%, and the rest are other elements; the plasticity index of the tailings is 12, and the calorific value is 1.8MJ / kg. Tailings particle size < 0.045mm; clay particle size < 2mm.

[0064] The clay brick preparation method is as follows:

[0065] Step 1: Transport the tailings to the slime dryer to dry until the moisture content is 15-18%;

[0066] Step 2: Sieving the clay through a drum sieve to obtain clay with a particle size of <2mm;

[0067] Step 3: Mix the clay obtained in step 2 with the tailings obtained in step 1 in proportion, and then transport them to two continuous first and second mixing systems of SJJ280×36 for stirring and rolling; the stirring speed of the first mixing system is 100-300r / min, ...

Embodiment 2

[0072] The raw material of the clay brick is composed of tailings and clay; the mass percentage of the tailings is 80%, and the mass percentage of the clay is 20%; The mass percentage of each component in the mine is: SiO 2 66%, Al 2 o 3 16%, Fe 2 o 3 5%, CaO 1%, MgO 1%, and the rest are other elements; the plasticity index of the tailings is 16, and the calorific value is 2.0 MJ / kg. Tailings particle size <0.045mm; clay particle size <2mm.

[0073] The clay brick preparation method is as follows:

[0074] Step 1: Transport the tailings to the slime dryer to dry until the moisture content is 15-18%;

[0075] Step 2: Sieving the clay through a drum sieve to obtain clay with a particle size of <2mm;

[0076] Step 3: Mix the clay obtained in step 2 with the tailings obtained in step 1 in proportion, and then transport them to two continuous first and second mixing systems of SJJ280×36 for stirring and rolling; the stirring speed of the first mixing system is 100-300r / min,...

Embodiment 3

[0081] The clay brick raw material is composed of tailings and clay; the mass percentage of the tailings is 90%, and the mass percentage of the clay is 10%; the tailings are directly obtained from coal slime after being re-sorted by a sorting column, and the tailings are The mass percentage of each component in the mine is: SiO 2 76%, Al 2 o 3 15%, Fe 2 o 3 2%, CaO 0.5%, MgO 0.5%, and the rest are other elements; the plasticity index of the tailings is 18, and the calorific value is 2.5MJ / kg. Tailings particle size <0.045mm; clay particle size <2mm.

[0082] The clay brick preparation method is as follows:

[0083] Step 1: Transport the tailings to the slime dryer to dry until the moisture content is 15-18%;

[0084] Step 2: Sieving the clay through a drum sieve to obtain clay with a particle size of <2mm;

[0085] Step 3: Mix the clay obtained in step 2 with the tailings obtained in step 1 in proportion, and then transport them to two continuous first and second mixing...

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Abstract

The invention relates to a terracotta brick and a preparation method thereof. The terracotta brick is composed of 70 to 90 wt.% of tailing and 10 to 30 wt.% of clay. The tailing is directly obtained by resorting coal slurry by a sorting facility. The tailing comprises following components in percentage by weight: 62 to 76% of SiO2, 15 to 17% of Al2O3, 2 to 5% of Fe2O3, 0.5 to 2% of CaO, 0.5 to 2%of MgO, and the balance being other elements; the plasticity index of tailing is 12 to 18; the calorific value is 1.8 to 2.5 MJ / kg, and the loss on ignition is 3 to 10%. The provided terracotta brickmeets or even exceeds the national standards. The coal slurry tailing is reutilized, and the clay resource is saved. The preparation method is simple and the time is greatly saved.

Description

technical field [0001] The invention belongs to the field of wall material production, and in particular relates to a clay brick and a preparation method thereof. Background technique [0002] The annual amount of raw coal selected in my country is about 2.4 billion tons, and the total amount of slime produced is 200-300 million tons. Coal slime is composed of kaolin, argillaceous shale, clay, coal and other minerals, and after repeated flotation, soaking, stirring, and pressure filtration, the coal and mud are mutually adsorbed and completely muddy and difficult to use. At present, part of the coal slime is used for power generation in power plants, and part of the coal slime is recycled by using existing equipment and processes exhaustively, but the calorific value of the tailings is still 7-8MJ / kg. These tailings are used for power generation in power plants, and the calorific value is too low to be directly used; open-air stacking pollutes the environment, and landfills...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132B03D1/02B03D1/14
CPCY02P40/60
Inventor 张岩斌
Owner 西安煤科动力科技有限公司
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