Method for reclaiming zinc and iron by directly reducing blast furnace gas mud through microwave

A blast furnace gas mud and microwave technology, applied in the treatment of zinc-containing gas mud, microwave direct reduction of blast furnace gas mud to recover zinc and iron, can solve problems affecting the smooth production of ironmaking, reducing the service life of the blast furnace, reducing the output of the blast furnace, etc. Achieve obvious social and economic benefits, improve life expectancy, and ensure the effect of resource recycling

Inactive Publication Date: 2013-05-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is directly returned to the blast furnace for use, it will not only increase the energy consumption of the blast furnace and reduce the output of the blast furnace, but also cause zinc nodules and rings on the blast furnace wall and gas discharge pipe due to the cyclic enrichment of zinc, which will affect the smooth production of ironmaking and reduce the service life of the blast furnace. Therefore, it must be dezincified and separated before it can be effectively used.

Method used

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  • Method for reclaiming zinc and iron by directly reducing blast furnace gas mud through microwave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using blast furnace gas mud from a steel company in Yunnan as raw material: the main components (wt, %) are: TFe 38.15, Zn 6.88, C 10.43, SiO 2 7.40, Al 2 o 3 3.26.

[0018] (1) According to the amount of binder added is 2% of the mass of the blast furnace gas mud, mix the blast furnace gas mud with the binder polyvinyl alcohol, and then add 10% of the total mass of the blast furnace gas mud and the binder polyvinyl alcohol After the carbon powder is pelletized, the particle size of the pellets is 3mm;

[0019] (2) Put the pellets obtained in step (1) into a ceramic crucible, place them in a microwave high-temperature reaction chamber, and heat them with microwaves at a frequency of 2450MHz, a power of 5KW, and a heating rate of 30°C / min to 1200°C, and keep warm 1h, the zinc oxide in the gas mud is reduced and then volatilized in the form of zinc vapor;

[0020] (3) Cooling the zinc vapor produced in step (2) to obtain superfine zinc oxide powder, and recovering t...

Embodiment 2

[0023] Using blast furnace gas mud from a steel company in Yunnan as raw material: the main components (wt, %) are: TFe 38.15, Zn 6.88, C 10.43, SiO 2 7.40, Al 2 o 3 3.26.

[0024] (1) According to the amount of binder added is 1.5% of the mass of the blast furnace gas mud, mix the blast furnace gas mud with the binder polyvinyl alcohol, and then add 15% of the total mass of the blast furnace gas mud and the binder polyvinyl alcohol Balling after toner;

[0025] (2) Put the pellets obtained in step (1) into a ceramic crucible, place them in a microwave high-temperature reaction chamber, and heat them with microwaves at a frequency of 2500MHz, a power of 1KW, and a heating rate of 30°C / min to 1150°C, and keep warm 1.5h, the zinc oxide in the gas mud is reduced and volatilized in the form of zinc vapor;

[0026] (3) Cooling the zinc vapor produced in step (2) to obtain superfine zinc oxide powder, and recovering the reduction slag to obtain iron concentrate after selection...

Embodiment 3

[0029] (1) According to the amount of binder added is 1% of the mass of the blast furnace gas mud, mix the blast furnace gas mud with the binder polyvinyl alcohol, and then add 20% of the total mass of the blast furnace gas mud and the binder polyvinyl alcohol Balling after toner;

[0030] (2) Put the pellets obtained in step (1) into a ceramic crucible, place them in a microwave high-temperature reaction chamber, and heat them with microwaves at a frequency of 2400MHz, a power of 6KW, and a heating rate of 30°C / min to 1100°C, and keep warm 2h, the zinc oxide in the gas mud is reduced and then volatilized in the form of zinc vapor;

[0031] (3) Cooling the zinc vapor produced in step (2) to obtain superfine zinc oxide powder, and recovering the reduction slag to obtain iron concentrate after selection and separation.

[0032] The removal rate of zinc in the treated gas mud can reach 97.2%, the grade of collected zinc oxide reaches 91.9%, the TFe in metallized slag reaches 60....

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Abstract

The invention provides a method for reclaiming zinc and iron by directly reducing blast furnace gas mud through microwave. The method comprises the following steps: mixing blast furnace gas mud and an adhesive, then adding carbon powder accounting for 10% to 20% of the total mass of the blast furnace gas mud and the adhesive for pelletizing; placing the pellets in a microwave high-temperature reaction cavity, heating to 1100 to 1200 DEG C through microwave under the conditions that the frequency is 2450 plus / minus 50 MHz, the power is 1 to 6 KW, and the heating rate is 30 DEG C / min, and preserving heat for 1 to 2 hours to ensure that after reducing, volatilizing zinc oxide in the gas mud in the form of zinc steam; and cooling the zinc steam generated through reduction to obtain super-fine zinc oxide powder, and reclaiming reducing slag after selecting and separating to obtain iron ore concentrate. According to the invention, a microwave high-temperature reduction technology is utilized, and the pellets are heated quickly by utilizing the microwave absorpting characteristic of zincky blast furnace gas mud and carbon powder; and zinc oxide in the gas mud is directly reduced through the carbon powder, the zinc steam obtained through reduction is collected to obtain super-fine zinc oxide powder with higher purity, and after zinc is removed, metal slag is recycled.

Description

technical field [0001] The invention relates to a treatment method for zinc-containing gas slime produced by blast furnaces in iron and steel enterprises, in particular to a method for recovering zinc and iron by microwave direct reduction of blast furnace gas slime, and belongs to the technical field of comprehensive utilization of solid waste in the metallurgical industry. Background technique [0002] Blast furnace gas ash (mud) is a by-product of the iron and steel industry. It is discharged with blast furnace gas during the blast furnace ironmaking process. It mainly contains fine iron powder, carbon powder and flux dust. After wet dust removal, washing, precipitation and concentration, it is gray-black mud. About 20kg of blast furnace gas ash (mud) containing 10% to 20% zinc will be produced for every 1 ton of steel produced. If it is directly returned to the blast furnace for use, it will not only increase the energy consumption of the blast furnace, reduce the output...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30C22B1/00
CPCY02P10/20
Inventor 许磊彭金辉刘秉国张利波王彬彬郭胜惠周敬文夏洪应
Owner KUNMING UNIV OF SCI & TECH
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