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Carburizing process for vanadium titano-magnetite direct reduced iron through shaft furnace

A technology for vanadium titanomagnetite and reduced iron, which is applied in shaft furnaces, metal material coating processes, furnaces, etc., can solve the problem that there is no carburizing process technology or method, unfavorable production of shaft furnaces, unfavorable DRI production and production. Discharge and other problems to achieve the effect of facilitating smooth reduction, reducing external carbon content, and reducing energy consumption

Active Publication Date: 2015-03-25
CISDI ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that for the production of vanadium-titanium magnet DRI with a more complex mineral structure, the CH4 content of the main process gas passed into the furnace exceeds 15%, and the DRI in the reduction zone will be bonded and partially pulverized, which is not conducive to the production and discharge of DRI. , using the self-reforming method containing CH4 reducing gas to control the amount of DRI carburization of vanadium-titanium ore, it is easy to cause the production of shaft furnace to be unfavorable
[0008] At present, there is no proprietary carburizing process technology or method for producing vanadium-titanium magnetite sponge iron by direct reduction in shaft furnace

Method used

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  • Carburizing process for vanadium titano-magnetite direct reduced iron through shaft furnace
  • Carburizing process for vanadium titano-magnetite direct reduced iron through shaft furnace

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Embodiment 1

[0040] Such as figure 1 Shown, the present invention provides a kind of carburizing process of vanadium-titanium-magnetite shaft furnace direct reduction iron, comprising the following steps:

[0041] 1) Pass the reducing gas at a temperature of 1000-1100°C into the reduction zone of the shaft furnace, and add 100% vanadium-titanium magnetite pellets from the top of the shaft furnace to form a countercurrent contact with the high-temperature reducing air flow to form a reduction reaction to form vanadium-titanium ore Sponge iron, high-temperature vanadium-titanium ore sponge iron is discharged from the bottom of the shaft furnace and transported to the external cooling carburizer 1 through a high-temperature transfer tank.

[0042] 2) The high-temperature vanadium-titanium direct reduced iron transported through the transfer tank is added from the top of the external carburizer 1, and the carburizing gas is passed through the middle and lower part of the carburizing device 1. ...

Embodiment 2

[0046] 1) Pass the reducing gas at a temperature of 1000-1100°C into the reduction zone of the shaft furnace, and add 100% vanadium-titanium magnetite pellets from the top of the shaft furnace to form a countercurrent contact with the high-temperature reducing air flow to form a reduction reaction to form vanadium-titanium ore Sponge iron, high-temperature vanadium-titanium ore sponge iron is discharged from the bottom of the shaft furnace and transported to the external cooling carburizer 1 through a high-temperature transfer tank.

[0047] 2) The high-temperature vanadium-titanium direct reduced iron transported through the transfer tank is added from the top of the external carburizer 1, and the carburizing gas is passed through the middle and lower part of the carburizing device 1. The temperature of the carburizing gas is about 40°C, and the pressure is is 0.13MPa, adjust and control the volume components of the carburizing gas to be CH 4 : 3.9%, H 2 : 65.17%, H2O: 5.78%...

Embodiment 3

[0050] 1) Pass the reducing gas at a temperature of 1000-1100°C into the reduction zone of the shaft furnace, and add 100% vanadium-titanium magnetite pellets from the top of the shaft furnace to form a countercurrent contact with the high-temperature reducing air flow to form a reduction reaction to form vanadium-titanium ore Sponge iron, high-temperature vanadium-titanium ore sponge iron is discharged from the bottom of the shaft furnace and transported to the external cooling carburizer 1 through a high-temperature transfer tank.

[0051] 2) The high-temperature vanadium-titanium direct reduced iron transported through the transfer tank is added from the top of the external carburizer 1, and the carburizing gas is passed through the middle and lower part of the carburizing device 1. The temperature of the carburizing gas is about 40°C, and the pressure is is 0.13MPa, adjust and control the volume components of the carburizing gas to be CH 4 : 4.8%, H 2 : 64.27%, H2O: 5.78%...

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Abstract

The invention provides a carburizing process for vanadium titano-magnetite direct reduced iron through a shaft furnace. According to the process, high-temperature schreyerite direct reduced iron reduced from the shaft furnace is transferred to an external carburator, carburizing gas flow with certain proportion of components is introduced into the carburator, the carburizing quantity of the schreyerite direct reduced iron is regulated accurately, the carbon content ranges from 0.5% to 4.0%, meanwhile, carburized gas is extracted back from the top of the carburator, is subjected to heat exchange by a heat exchanger, washing by a washer, dehydration and compression to form normal-temperature gas flow with pressure, the gas flow is reused to a main carburizing gas, and the carburizing gas is recycled. A reduction zone and a carburizing zone are separated physically, so that bonding or even powdering of the direct reduced iron due to a carburizing reaction of the vanadium titano-magnetite in a high-temperature reduction zone are avoided, and smooth reduction of the vanadium titano-magnetite is facilitated.

Description

technical field [0001] The invention relates to the field of smelting technology, in particular to a carburizing process for directly reducing iron in a vanadium-titanium-magnetite shaft furnace. Background technique [0002] Using vanadium-titanium magnetite as iron raw material, adopting the gas-based shaft furnace-submerged arc furnace melting process, can produce high-quality vanadium-titanium magnetite direct reduced iron (hereinafter referred to as vanadium-titanium ore DRI), so as to realize Large-scale recovery of Fe, V, and Ti resources, expanding the added value of vanadium and titanium products, and further exploring the resource advantages of vanadium-titanium magnetite in Panxi, my country. [0003] In order to give full play to the superiority of the gas-based shaft furnace + submerged arc furnace melting process to realize the comprehensive utilization process of vanadium-titanium ore and to meet the requirements of reduction melting for the appropriate carbon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02C23C8/22
CPCY02P10/143
Inventor 吴开基郭敏张涛李佳楣赵运建
Owner CISDI ENG CO LTD
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