Method and system for producing steel slag sintered brick

A technology of sintered bricks and steel slag, applied in clay products, applications, household appliances, etc., can solve the problems of poor stability and limited application of steel slag, and achieve the effect of solving the problem of poor stability

Active Publication Date: 2020-03-24
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since steel slag contains free calcium oxide and free magnesium oxide, its volume will expand when it meets water, resulting in poor stability of steel slag, which greatly limits its application in road materials

Method used

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  • Method and system for producing steel slag sintered brick

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) use the steel slag mill 1 to grind the steel slag to a 450-micron sieve residue of not more than 10%, make the steel slag powder, and store it in the steel slag powder bin 2;

[0046] (2) Select engineering spoil as auxiliary material, use auxiliary material mill 5 to grind it to a 100-micron sieve residue of not more than 10%, make auxiliary material powder, and store in auxiliary material warehouse 4;

[0047] (3) take clay as binder, mix it with water according to the ratio of (50wt%:50wt%) to make binding slurry, and store it in binding slurry tank 3;

[0048] (4) 25wt% auxiliary powder, 70wt% steel slag powder and 5wt% binder slurry are sent into the pelletizing chamber 6, mixed and granulated to form raw pellets of about 800 microns;

[0049] (5) The raw pellets are aged in the aging chamber 7 for 1 day, and after being formed by the brick press 8, they are then sent to the drying chamber 9 at 150° C. for drying for 1 hour, and fired under the condition of 115...

Embodiment 2

[0051] (1) use the steel slag mill 1 to grind the steel slag to a 350-micron sieve residue of not more than 10%, make the steel slag powder, and store it in the steel slag powder bin 2;

[0052] (2) Select blast furnace slag as auxiliary material, grind to 150 micron sieve residue not more than 10% by auxiliary material mill 5, make auxiliary material powder, and store in auxiliary material warehouse 4;

[0053] (3) take polyvinyl alcohol as a binder, mix it with water according to the ratio of (30wt%:70wt%) to make a bonding slurry, and store it in the bonding slurry tank 3;

[0054] (4) 30wt% auxiliary powder, 60wt% steel slag powder and 10wt% binder slurry are sent into the pelletizing chamber 6, mixed and granulated to form raw pellets of about 1000 microns;

[0055] (5) The raw pellets are aged in the aging chamber 7 for 3 days, and after being formed by the brick press 8, they are then sent to the drying chamber 9 at 150° C. for drying for 1 hour, and are fired under the...

Embodiment 3

[0057] (1) use the steel slag mill 1 to grind the steel slag to a 450-micron sieve residue of not more than 10%, make the steel slag powder, and store it in the steel slag powder bin 2;

[0058] (2) Select blast furnace slag and engineering spoil as auxiliary materials, mix them according to the ratio of (30wt%: 70wt%), and grind them to a 100-micron sieve residue of not more than 10% by auxiliary material mill 5 to prepare auxiliary material powder and store it in In the auxiliary material warehouse 4;

[0059] (3) take dextrin as a binder, mix it with water according to the ratio of (20wt%:80wt%) to make a binding slurry, and store it in the binding slurry tank 3;

[0060](4) 20wt% auxiliary powder, 70wt% steel slag powder and 10wt% binder slurry are sent into the pelletizing chamber 6, mixed and granulated to form raw pellets of about 600 microns;

[0061] (5) The raw pellets are aged in the aging chamber 7 for 5 days, and after being formed by the brick press 8, they are ...

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Abstract

The invention discloses a method and a system for producing a steel slag sintered brick. Steel slag used as a main raw material and one or more industrial solid wastes such as blast furnace slag, clayand waste porcelain, which are used as auxiliary materials, are sintered at a high temperature to produce the sintered brick. The method specifically comprises the following steps: grinding steel slag to 300-500 [mu]m to prepare steel slag powder, and grinding the auxiliary materials to 50-200 [mu]m to prepare auxiliary material powder; mixing the binder and water to prepare a binding slurry; uniformly mixing the steel slag powder, the auxiliary material powder and the binding slurry in a balling chamber according to a certain ratio to prepare raw material balls; and aging the raw material balls in an aging chamber for 0.5-7 days to form a steel slag brick blank, drying the steel slag brick blank, and sintering the steel slag brick blank at 1000-1300 DEG C to obtain the steel slag sintered brick. The content of free calcium oxide in the produced steel slag sintered brick is lower than 0.5 wt%, the stability is good, the problem that the volume stability of steel slag is poor is solved, and large-scale recycling of the steel slag is facilitated.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment in the iron and steel industry, and in particular relates to a method and a system for preparing steel slag sintered bricks. Background technique [0002] Steel slag is a solid waste discharged during the steelmaking process, and the discharge amount is very large, up to about 15% of the steel output. Due to the limitation of application technology, the application rate of steel slag in my country is only about 10%. It is mainly used in the field of building materials, and a large amount is stored in the form of stacking. Pollution. If it is not dealt with and utilized, it will cause more serious social problems. [0003] On the other hand, with the development of society and the improvement of people's living standards, the pace of urban modernization is accelerating, and the urban ecological environment is under great pressure. In order to live in harmony with nature and reduce o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/138C04B33/132
CPCC04B33/138C04B33/1324C04B33/1328C04B2235/656Y02P40/60
Inventor 范海宏李大伟李玉祥吕梦琪米晓凡
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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