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Coal-based direct reduction-melt separation furnace smelting reduction iron-making process using external heating mode

A melting furnace and external heating technology, applied in the direction of fluidized bed furnace, etc., can solve the problems of insufficient utilization of gas chemical energy and physical heat, difficult pre-reduction control, low equipment operation rate, etc., and achieve pellet strength Low requirements, good heat conduction effect, and the effect of reducing energy consumption and cost

Active Publication Date: 2015-11-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above direct reduction and smelting reduction ironmaking technologies have been developed so far, and no method can completely replace the blast furnace ironmaking technology. The main problems are difficult pre-reduction control, low equipment operation rate, insufficient utilization of gas chemical energy and physical heat, and coal consumption. and high oxygen consumption

Method used

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  • Coal-based direct reduction-melt separation furnace smelting reduction iron-making process using external heating mode
  • Coal-based direct reduction-melt separation furnace smelting reduction iron-making process using external heating mode
  • Coal-based direct reduction-melt separation furnace smelting reduction iron-making process using external heating mode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: A kind of external heating type coal-based direct reduction-smelting furnace smelting reduction ironmaking process:

[0046] The high-iron bauxite ore powder, coal powder, binder, flux and other ingredients are fully mixed and granulated (carbon-containing pellets), and pelletized by a disc pelletizer. The pellet size is about 10-30mm. The carbon-containing pellets are dried and preheated by using the furnace top flue gas after heat exchange, and finally discharged from the chimney. The drying and preheating temperature is 200°C. Sealed reduction in the reduction chamber of silicon carbide well structure. The preheated gas and combustion-supporting air are fully combusted to provide sufficient heat to the combustion chamber. Finally, the temperature of the combustion chamber is controlled to 1420 °C, the reduction temperature of the reduction chamber is controlled to 1300 °C, and the reduction time is 12 hours.

[0047] The temperature of the high-tempera...

Embodiment 2

[0049] Embodiment 2: A kind of external heating type coal-based direct reduction-smelting furnace smelting reduction ironmaking process:

[0050] The New Zealand sea sand ore powder, coal powder, binder, flux and other ingredients are fully mixed and granulated (carbon-containing pellets), and the balls are pressed with a double-roller briquetting machine. The pellet size is about 40mm. The carbon-containing pellets are dried and preheated by using the furnace top flue gas after heat exchange, and finally discharged from the chimney. The drying and preheating temperature is 250°C. Sealed reduction in the reduction chamber of silicon carbide well structure. The preheated gas and combustion-supporting air are fully combusted to provide sufficient heat to the combustion chamber. Finally, the temperature of the combustion chamber is controlled to 1460 °C, the reduction temperature of the reduction chamber is controlled to 1330 °C, and the reduction time is 6 hours.

[0051] The t...

Embodiment 3

[0053] Embodiment 3: A kind of external heating type coal-based direct reduction-smelting furnace smelting reduction ironmaking process:

[0054] The nickel slag, coal powder, binder, flux and other ingredients are fully mixed and granulated (carbon-containing pellets), and the balls are pressed by a double-roller briquetting machine. The pellet size is about 30mm. The carbon-containing pellets are dried and preheated by using the flue gas from the furnace top after heat exchange, and finally discharged from the chimney. The drying and preheating temperature is 150°C. Sealed reduction in the reduction chamber of silicon carbide well structure. The preheated gas and combustion-supporting air are fully combusted to provide sufficient heat to the combustion chamber. Finally, the temperature of the combustion chamber is controlled to 1420°C, the reduction temperature of the reduction chamber is controlled to 1250°C, and the reduction time is 8 hours.

[0055] The temperature of t...

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Abstract

The invention relates to a coal-based direct reduction-melt separation furnace smelting reduction iron-making process using an external heating mode. Equipment used in the process comprises a pellet drying chamber, a distributing device, an external heating type reduction furnace and a melt separation furnace which are arranged from top to bottom. The process includes the steps that S1, carbon-bearing pellets are preheated and dried in the pellet drying chamber; S2, the carbon-bearing pellets in a reduction chamber are continuously and evenly heated, and the carbon-bearing pellets are quickly reduced in the reduction chamber; S3, high-temperature metallized pellets are obtained after the carbon-bearing pellets in the reduction chamber are reduced, and the high-temperature metallized pellets are charged into the melt separation furnace in a hot-delivery and hot-charging mode to be subjected to reduction smelting; S4, after the metallized pellets enter the melt separation furnace, the melting point, the viscosity and the separating effect of slag iron are controlled through the content of added flux and pulverized coal, reduction smelting of the metallized pellets is completed, and accordingly high-quality molten iron and high-temperature furnace slag are obtained. By the adoption of the process, iron ore which is low in grade and difficult to reduce is utilized comprehensively, the technological process is shortened, production cost is lowered, product quality is improved, and production efficiency is effectively improved.

Description

technical field [0001] The invention relates to the technical field of non-blast furnace ironmaking, in particular to an external heating type coal-based direct reduction and smelting reduction ironmaking process. Background technique [0002] At present, the iron and steel industry is mainly based on blast furnace ironmaking. The traditional blast furnace ironmaking process is long, and coke must be used in blast furnace ironmaking. With the shortage of global coking coal resources and the increasingly serious environmental pollution caused by the coking process, the blast furnace ironmaking process has become impossible. avoid the above problems. Therefore, in order to get rid of the shortage of coking coal resources on the development of the iron and steel industry, adapt to the increasing environmental protection requirements, reduce the energy consumption of iron and steel production, improve the structure of iron and steel products and improve the quality and quality, ...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 张颖异吕学伟白晨光邱贵宝李生平吕炜
Owner CHONGQING UNIV
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