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Metallurgical slag sintered bricks and preparation method thereof

A technology of metallurgical slag and sintered bricks, which is applied in the fields of environmental protection and resource utilization, can solve problems such as the utilization of metallurgical slag that cannot be scaled up, high requirements on raw material composition and physical properties, and restrictions on the application of metallurgical slag, so as to reduce the production capacity. consumption, good green strength, and comprehensive utilization

Inactive Publication Date: 2017-02-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of metallurgical slag not only occupies a large amount of valuable land resources, but also seriously pollutes the environment, which has a direct or indirect impact on people's production and life in many ways
At present, the utilization rate of steel slag in my country is less than 30%, and the utilization rate of red mud is only 4%. It is a major issue for metallurgical enterprises and even the whole society to seek an effective way for large-scale and resource utilization of metallurgical slag such as steel slag and red mud.
In addition, this process requires complex processes such as wet grinding and spray granulation, which has high requirements on raw material composition and physical properties, which also limits the application of metallurgical slag in the field of ceramics, and cannot solve the problem of large-scale utilization of metallurgical slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0030] This embodiment provides a method for preparing a metallurgical slag sintered brick, the method comprising:

[0031] The sieve residue of the 1mm sieve of the crushing and ball milling process discharged in parts by weight is less than 1%, the quality of CaO accounts for 15% of the total mass of metallurgical slag, and Fe 2 o 3 The mass of the metallurgical slag accounts for 40% of the total mass of the metallurgical slag, 5 parts of iron-selected tailings, 95 parts of clay in parts by weight, and mixes evenly. After the mixed mixture is aged, it is formed into bricks by pressing, and the bricks are dried Finally, enter the kiln and fire at a temperature of 1100°C to obtain sintered bricks.

[0032]This embodiment also provides a sintered brick prepared by the above method. The sintered brick is red in color, has a water absorption rate of 5.1%, and a compressive strength of 125 MPa.

no. 2 example

[0034] This embodiment provides a method for preparing a metallurgical slag sintered brick, the method comprising:

[0035] The crushing in parts by weight, the sieve residue of the 1mm sieve discharged by the ball milling process is less than 1%, the quality of CaO accounts for 50% of the total mass of metallurgical slag, and Fe 2 o 3 The mass percentage of the total mass of the metallurgical slag is 20 parts of red mud, 80 parts of shale in parts by weight, and 2 parts of flux in parts by weight, mixed uniformly, and after the mixed mixture is stale, The adobe is extruded into adobe, dried, put into a kiln, and fired at a temperature of 1000°C to obtain a sintered brick.

[0036] This embodiment also provides a sintered brick prepared by the above method. The sintered brick is red in color, has a water absorption rate of 4.7%, and a compressive strength of 285 MPa.

no. 3 example

[0038] This embodiment provides a method for preparing a metallurgical slag sintered brick, the method comprising:

[0039] The crushing in parts by weight, the sieve residue of the 1mm sieve discharged by the ball milling process is less than 1%, the quality of CaO accounts for 30% of the total mass of metallurgical slag, and Fe 2 o 3 The mass of the metallurgical slag accounts for 30 parts of steel slag tailings of 25%, 70 parts of clay and shale mixture in parts by weight, and 1.5 parts of flux in parts by weight. They are mixed evenly, and the mixed After the mixture is stale, it is extruded into adobe. After drying, the adobe is put into a kiln and fired at a temperature of 1070°C to obtain a sintered brick.

[0040] This embodiment also provides a sintered brick prepared by the above method, the color of the sintered brick is brown, the water absorption is 6.4%, and the compressive strength is 202 MPa.

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Abstract

The invention provides metallurgical slag sintered bricks and a preparation method thereof. The preparation method comprises the following steps: mixing metallurgical slag, clay and / or shale and an additive, which meet a preset condition, according to preset proportions; aging the mixture obtained after mixing, and then performing forming to obtain green bricks; and drying the green bricks, and then burning the green bricks in a kiln to obtain the sintered bricks. According to the preparation method provided by the invention, by controlling the preset condition of the metallurgical slag, the clay and the additive can be directly mixed with the metallurgical slag by stirring, and secondary breaking is not needed, so that the energy consumption of the preparation is greatly reduced; the metallurgical slag has a function of reducing the melting point, so that the temperature of a sintering reaction can be reduced; and by controlling factors including the content of ferric oxide in the metallurgical slag, the sintering temperature and the sintering atmosphere, sintered bricks with different colors can be obtained without adding an expensive coloring agent, so that large-scale utilization of the metallurgical slag is achieved, mineral resources are saved, and meanwhile, qualified sintered bricks are produced with low cost, low energy consumption and a high efficiency, thereby achieving comprehensive utilization of resources, and protecting the environment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource utilization, and in particular relates to a metallurgical slag fired brick and a preparation method thereof. Background technique [0002] In the production process of the metallurgical industry, a large amount of solid waste, namely metallurgical slag, will be produced. For example, in the iron and steel industry, my country produces more than 800 million tons of crude steel per year, and the output of steel slag accounts for 12%-20% of crude steel output; in the aluminum industry, for every 1t of alumina produced, 0.8-1.5t of red mud can be produced, About millions of tons of red mud are generated in my country every year. A large amount of metallurgical slag not only occupies a large amount of valuable land resources, but also seriously pollutes the environment, which directly or indirectly affects people's production and life in many ways. At present, the utiliza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/138C04B33/132C04B33/13
CPCC04B33/13C04B33/1322C04B33/138C04B2235/96Y02P40/60
Inventor 李宇姜峰王耀忠王亚昆张玲玲苍大强
Owner UNIV OF SCI & TECH BEIJING
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