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Method and system for preparing steel slag ceramsite

A technology of steel slag and ceramsite, applied in the production of clay products, ceramic products, ceramic materials, etc., can solve the problems of limited application and poor stability of steel slag

Pending Publication Date: 2020-04-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 preparing steel slag ceramsite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Utilize the steel slag mill 1 to grind the steel slag to a 100-micron sieve residue of no more than 10%, make steel slag powder, and store it in the steel slag powder bin 2;

[0045] (2) Choose clay as an auxiliary material, use the auxiliary material mill 5 to grind it to a sieve of 100 microns to be no more than 10%, make auxiliary material powder, and store it in the auxiliary material bin 4;

[0046] (3) using dextrin as a binding agent, mixing it with water according to the ratio of (30wt%:70wt%) to make a bonding slurry, which is stored in the bonding slurry tank 3;

[0047] (4) 20wt% auxiliary material powder, 70wt% steel slag powder and 10wt% binder slurry are sent to granulator 6, mixed and granulated to form balls with a size of about 800 microns;

[0048] (5) Send the balls into the disc ball forming machine to form raw material balls with a size of 5000 microns to 10000 microns;

[0049] (6) Send the raw meal balls into the drum dryer 8 at 130°C to dry ...

Embodiment 2

[0052] (1) Utilize steel slag mill 1 to grind steel slag to 350 micron sieve and be no more than 10%, make steel slag powder, store in steel slag powder bin 2;

[0053] (2) choose blast furnace slag as auxiliary material, grind to 150 micron sieve and be no more than 10% through auxiliary material mill 5, make auxiliary material powder, store in auxiliary material bin 4;

[0054] (3) using polyvinyl alcohol as a binding agent, mixing it with water according to the ratio of (35wt%:65wt%) to make a bonding slurry, which is stored in the bonding slurry tank 3;

[0055] (7) 30wt% auxiliary material powder, 50wt% steel slag powder and 20wt% binder slurry are sent to granulator 6, mixed and granulated to form balls with a size of about 600 microns;

[0056] (8) Send the balls into the disc ball forming machine to form raw material balls with a diameter of 10,000 microns to 30,000 microns;

[0057] (9) Send the raw meal balls into a rotary drum dryer 8 at 150° C. to dry for 1 hour, ...

Embodiment 3

[0060] (1) Utilize the steel slag mill 1 to grind the steel slag to a 400-micron sieve of no more than 10%, make steel slag powder, and store it in the steel slag powder bin 2;

[0061] (2) select blast furnace slag and engineering spoil as auxiliary materials, after mixing according to the ratio of (30wt%:70wt%), grind to 100 micron sieves and be no more than 10% through auxiliary material mill 5, make auxiliary material powder, store in Auxiliary material warehouse 4;

[0062] (3) using dextrin as a binding agent, mixing it with water according to the ratio of (20wt%:80wt%) to make a bonding slurry, which is stored in the bonding slurry tank 3;

[0063] (4) 15wt% auxiliary material powder, 70wt% steel slag powder and 15wt% binder slurry are sent into the ball forming chamber 6, mixed and granulated to form balls with a size of about 500 microns;

[0064] (5) Send the balls into the disc ball forming machine to form raw material balls with a diameter of 8000 microns to 20000 m...

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Abstract

The invention discloses a method and a system for preparing steel slag ceramsite. Steel slag is used as the main raw material, and one or more industrial solid waste materials such as blast furnace slag, clay, and waste porcelain are used as auxiliary materials, and a fired brick is manufactured by firing at high temperature. The method includes grinding the steel slag to 100-500 microns to obtainsteel slag powder, and grinding the auxiliary materials to 50-200 microns to prepare auxiliary material powder; mixing a binder and water to prepare binder slurry; mixing the steel slag powder, the auxiliary material powder and the binder slurry according to a certain ratio in a granulator to prepare spherical masterbatch; pelleting the spherical masterbatch in a pelleting machine to prepare rawmaterial pellets, drying, and firing at 900-1250 DEG C to prepare the steel slag ceramsite. The bulk density of the steel slag ceramsite prepared by the invention reaches 500 kg / m<3> to 1100 kg / m<3>,the cylinder compressive strength reaches up to 35 MPa, the content of free calcium oxide in the ceramsite is less than 0.5 wt%, stability is good, a problem that steel slag volume stability is poor is solved, facilitating large-scale resource utilization of the steel slag.

Description

technical field [0001] The invention belongs to the technical field of iron and steel industry solid waste treatment, in particular to a method and system for preparing steel slag ceramsite. Background technique [0002] Steel slag is the solid waste discharged during the steelmaking process, and the discharge amount is very large, which can reach 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, which has exceeded 200 million tons, occupying a large amount of land and causing water, air and other environments. pollute. If it is not processed 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 demand f...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B33/138C04B33/32C04B33/132
CPCC04B38/009C04B33/138C04B33/1305C04B33/32C04B33/1324C04B2235/96C04B2235/77C04B38/0067C04B38/0645C04B38/067Y02P40/60
Inventor 范海宏吕梦琪李大伟米晓凡贾璐卫
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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