Method and device for making iron by smelting reduction

A smelting furnace and cooling device technology, applied in the field of smelting reduction ironmaking, can solve the problems of easy oxidation of raw material moldings and difficult separation of slag and iron

Active Publication Date: 2010-02-17
SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technical scheme still has disadvantages such as that the raw material is easily oxidized during the reduction process, and the slag and iron are not easy to separate.

Method used

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  • Method and device for making iron by smelting reduction
  • Method and device for making iron by smelting reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The device is an electric arc furnace for ironmaking, and the raw material is a breathing shell.

[0045] The device of electric arc furnace smelting reduction ironmaking described in the present invention is as figure 1 As shown, it includes a furnace body 2, a furnace cover 3, feeding equipment and discharging equipment, and the lower part of the furnace body 2 has a molten iron / steel outlet 9. A gas inlet 16 is provided at the bottom of the electric arc furnace, and the gas inlet is connected with a gas pipeline 10 . Such as image 3 As shown, there are three electrode jacks on the furnace cover 3, which are respectively inserted into the electrode 1, and the three electrode jacks are distributed in a triangle. A pair of heating furnaces 5a, 5b and a pair of regenerators 6a, 6b outside the furnace body 2, and the two heating furnaces are installed on both sides outside the furnace body 2. The heating furnace is connected with the furnace body 2 of the electric arc...

Embodiment 2

[0056] The device is submerged arc furnace ironmaking, and the raw material is semi-breathing shell.

[0057] Submerged arc furnace smelting reduction ironmaking equipment such as Figure 4 As shown, it includes a furnace body 2, a furnace cover 3, an electrode 1, and supporting heating furnaces 5a, 5b, regenerators 5a, 5b, and a gas treatment device 8. A gas inlet 16 is provided at the bottom of the electric arc furnace, and it is connected with a gas pipeline 10 connect. The gas processing device includes circulating gas booster, gas cooling and purification device, gas storage tank and other devices, and the gas processing device may or may not be used. In order to make full use of waste heat, the device is also equipped with two or more slag cooling devices 18 and two or more pig iron or continuous casting slab or rolling material cooling devices 19 . The heat of molten slag or continuous casting slab or rolling material is brought into the furnace body 2 through the hea...

Embodiment 3

[0068] The device is a converter, and the raw material is an open shell.

[0069] The converter smelting reduction ironmaking device such as Figure 5 As shown, it includes a furnace body 2, a furnace cover 3, electrodes and supporting furnaces 5a, 5b, regenerators 6a, 6b and a gas treatment device 8. The cover of the converter is provided with a gas inlet 16 and a desulfurizer feeding port 11 , and the gas inlet 16 is connected with the gas pipeline 10 . In order to make full use of waste heat, the device is also equipped with two or more slag cooling devices 18 and two or more pig iron or continuous casting slab or rolling material cooling devices 19 . The heat of molten slag or continuous casting slab or rolling material is brought into the furnace body 2 through the heating furnaces 5a and 5b by utilizing the circulation of the precipitated gas.

[0070] The process steps of converter smelting reduction ironmaking are as follows:

[0071] (1) Preparation of open shell: ...

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Abstract

The invention relates to a method and a device for making iron by smelting reduction. The method for making iron by smelting reduction comprises the following steps: putting raw material forming matters into a smelting ironmaking device; heating and reducing the raw material forming matters into metallic iron; after the reduced metalation rate of various oxides of iron reaches 40-95 percent in rawmaterials, heating and melting products of a reducing furnace; and producing direct reduction molten steel or molten iron produced by the similar blast furnace. The raw materials comprise a breath shell or a half-breath shell or an opening shell or the combination of the raw materials, a coating shells of the breath shell, the half-breath shell and the opening shell is prepared by adding an adhesive in calcium oxide or calcium carbonate or calcium carbide or the combination of the materials. The device for making iron by smelting reduction comprises an arc furnace, a buried arc furnace, a converter, an induction furnace, and the like. After reduction products are heated and melted, and oxygen or inert gas is blown into the arc furnace in order to remove slag. Due to the adoption of a shell coating technology, the method and the device effectively prevent from oxidizing reduced matters in the process, avoid bonding formed matters for contact and are combined with blowing gas and are good for making slag. Slag iron has good separation effect, and the produced iron and steel products have good quality.

Description

technical field [0001] The present invention relates to a method and device for smelting reduction ironmaking, in particular to a method and method for producing direct reduction molten steel and molten iron similar to blast furnace production using a smelting reduction device with a heat accumulator using natural ore or artificial lump iron ore as raw material device. Background technique [0002] Smelting reduction ironmaking is an important part of current steel production. Its main feature is to use non-coking coal as a primary energy source and reducing agent to reduce iron oxide in a molten state. It has the advantages of using coal instead of coke, short process, and less environmental pollution. , less investment in construction, low production costs, etc., is a widely optimistic field in the industry. Iron and steel enterprises in various countries are competing to carry out research and development. The existing smelting reduction ironmaking methods mainly include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00C21B13/00C21B11/10C21B13/12C01B32/942
CPCC21B11/08C21C5/285C21C5/5211C21B13/12C21B11/10C21B13/0013C21C1/02Y02P10/134Y02P10/20
Inventor 贾会平
Owner SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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