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Method for gas-based direct reduction for iron ore powder

An iron ore powder, direct technology, applied in the direction of reducing gas emissions, can solve the problems such as gas-solid reaction cannot proceed smoothly, liquid phase is generated, etc., and achieve the effect of accelerating the random diffusion rate, fully reacting, and improving the diffusion rate.

Inactive Publication Date: 2020-09-29
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] In order to solve the problems existing in the prior art, the object of the present invention is to provide a method for gas-based direct reduction of iron ore powder. The present invention makes the carbon-based additive inside the pellet by adding carbon-based additives during pellet preparation. Pore ​​making and reduction gas conversion rate are enhanced, which solves the problem in the prior art that when the temperature of the direct reduction reaction is too high, a liquid phase is generated inside the pellets, resulting in the failure of the gas-solid reaction to proceed smoothly, and can effectively improve the gas-based direct reduction reaction. rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, fully mix the iron ore powder and semi-coke, the fixed carbon in the semi-coke and the oxygen atom ratio in the iron oxide in the iron ore powder C / O=0.4, after mixing, add bentonite, the amount of bentonite added is iron ore powder 3% of the total mass of semi-coke and bentonite, and then put the material into the mixer for stirring and mixing, and send the uniformly mixed material into the pelletizing machine to prepare pellets. After the pellets are dried, pellets with a particle size of 8 ~14mm pellets are placed in a reduction furnace for reduction, the hydrogen gas fraction in the hydrogen-rich atmosphere is 35%, the reduction temperature is 1080°C, and the reduction time is 1h. ηFe=95.9% in the final product.

Embodiment 2

[0035] First, fully mix the mixture of iron ore powder, semi-coke and anthracite, the fixed carbon in the mixture of semi-coke and anthracite and the oxygen atom ratio of iron oxide in iron ore powder C / O=0.2, after mixing, add bentonite, and then add bentonite The amount is 2.5% of the total mass of iron ore powder, semi-coke powder, anthracite and bentonite, and then the materials are put into a mixer for stirring and mixing, and the evenly mixed materials are sent to a pelletizing machine to prepare pellets, and the pellets are After drying, put the pellets with a particle size of 8-14mm into a reduction furnace for reduction. The hydrogen gas fraction in the hydrogen-rich atmosphere is 33%, the reduction temperature is 1020°C, and the reduction time is 1.3h. In the final product obtained, ηFe=96.7%.

Embodiment 3

[0037] Firstly, the iron ore powder and biomass are fully mixed, the fixed carbon in the biomass and the oxygen atom ratio of iron oxide in the iron ore powder are C / O=0.1, after mixing, water glass is added, and the amount of water glass added is iron ore powder , 2% of the total mass of biomass and water glass, and then put the material into a mixer for stirring and mixing, and send the uniformly mixed material into a ball press to prepare pellets. After the pellets are dried, the pellets with a particle size of The 8-14mm pellets are put into the reduction furnace for reduction, the hydrogen gas fraction in the hydrogen-rich atmosphere is 31%, the reduction temperature is 980°C, and the reduction time is 1.5h. ηFe=97.5% in the final product.

[0038] The invention is easy to control, has low energy consumption, reduces reduction time and improves productivity. By adding carbon-based additives to the raw materials of the pellets and controlling the reduction temperature at ...

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Abstract

The invention belongs to the technical field of non-blast furnace ironmaking and discloses a method for gas-based direct reduction for iron ore powder. The iron ore powder and a carbon-based additiveare mixed evenly and are bonded into pellets through a binder, then drying treatment is conducted, the dried pellets are reduced, wherein the ratio of carbon in the carbon-based additive to oxygen atoms in the iron ore powder is 0.1-0.4, the reduction temperature is 980-1080 DEG C, and reduction time is 1-1.5 h. The method is easy to control and low in energy consumption, the reduction time is reduced, and productivity is improved. The carbon-based additive is added into the pellet raw materials, thus the reduction temperature is controlled to 980-1080 DEG C, pores can be formed in the pellets, the contact area of reduction gas and iron oxide is increased, conversion efficiency of the reductive gas is enhanced, and the gas-based direct reduction reaction rate is effectively increased. Meanwhile the method has the characteristics that pollution is avoided, and the product cleanliness is high.

Description

technical field [0001] The invention belongs to the technical field of non-blast furnace ironmaking, in particular to a gas-based method for directly reducing iron ore powder. Background technique [0002] The gas-based direct reduction process is the main production method of direct reduced iron, and the technology is mature. The direct reduced iron produced by the gas-based direct reduction process accounts for more than 75% in the world. The significant advantages of the gas-based direct reduction process are that no coking coal is consumed, energy saving, environmental protection, and CO 2 Low emissions. The gas-based direct reduction process plays a good role in energy saving, emission reduction, low-carbon environmental protection, and is a low-carbon green ironmaking technology with excellent product quality. [0003] In the existing gas-based direct reduction process, the direct reduction reaction temperature is usually controlled below 960°C. When the temperature...

Claims

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Application Information

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IPC IPC(8): C21B13/00C22B1/244C22B1/243
CPCC21B13/0066C21B13/0073C22B1/2406C22B1/243C22B1/244Y02P10/143
Inventor 邢相栋郑建潞臧旭媛张馨艺杜月利庞焯刚李小明吕明巨建涛宋佳乐王岐沈正华
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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