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A device and method for producing molten iron by high-temperature smelting of pre-reduced iron ore

A high-temperature smelting and iron ore technology, applied in the field of metallurgy, can solve the problems of large coal consumption in smelting reduction furnaces, reduce pollutant emissions, reduce the use of coking coal, etc., and achieve the effects of reducing energy consumption loss and improving utilization efficiency.

Active Publication Date: 2020-11-06
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Unlike blast furnace ironmaking, non-blast furnace ironmaking has certain advantages in terms of energy consumption; specifically, non-blast furnace ironmaking can greatly reduce the use of coking coal, which reduces the cost of blast furnace ironmaking in pelletizing, sintering and coking processes. Pollutant emissions generated by the iron process; the HIsmelt process is a typical non-blast furnace ironmaking method, which uses a smelting reduction furnace (SRV furnace) for smelting reduction of pre-reduced iron ore to obtain qualified molten iron; but the smelting reduction There is a large coal consumption in the furnace, so there is an urgent need to develop new low-consumption non-blast furnace ironmaking technology and equipment

Method used

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  • A device and method for producing molten iron by high-temperature smelting of pre-reduced iron ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The structure of the device for producing molten iron by high-temperature smelting of pre-reduced iron ore is as follows: figure 1 As shown, it includes a furnace body 9, an electrode 1 and a coal-fired spray gun 2; the raw material delivery pipeline 7 is inserted into the furnace body; High-temperature flue gas outlet 8, electrode 1 and coal-fired spray gun 2, the bottom of electrode 1 is located in the slag layer area, the outlet of coal-fired spray gun 2 and the outlet of raw material delivery pipeline 7 are located in the upper space, and the slag discharge port 6 is located in the slag layer space Inside, the molten iron outlet 4 communicates with the molten iron layer area;

[0026] The pellets of a certain pre-reduced iron ore contain TFe 55.62%, MFe 38.93%, SiO by weight percentage 2 3.01%, Al 2 o 3 7.28%, CaO 0.10%, MgO 10.2%, P 0.08%, S 0.03%, particle size ≤12mm;

[0027] The reducing agent pulverized coal used contains 60% of fixed carbon by weight perc...

Embodiment 2

[0034] A pellet of pre-reduced powdered iron ore, containing TFe 57.73%, MFe 46.18%, SiO 2 7.55%, Al 2 o 3 3.42%, CaO 1.32%, MgO 2.36%, P 0.09%, S 0.04%, particle size ≤12mm;

[0035] The reducing agent pulverized coal contains 78% of fixed carbon by weight percentage, and the part with a particle size of -0.074mm accounts for 40% of the total weight;

[0036] Device structure is with embodiment 1; Method is with embodiment 1, and difference is:

[0037] (1) The add-on of flux is 1.80 by the alkalinity after pre-reduced iron ore and flux are mixed;

[0038] (2) The amount of pulverized coal injection is based on coal ratio = 200kg / t;

[0039] (3) The time for controlling the pre-reduced iron ore from entering the device to melting is 1.5h, and the temperature in the device is 1550°C;

[0040] The obtained molten iron contains Fe 93%, C 4.2%, P 0.03%, S 0.01%, Si 0.4%, Al 0.04% by mass percentage.

Embodiment 3

[0042] Pellets using a pre-reduced powdered iron ore, containing TFe 62.83%, MFe 50.55%, SiO 2 3.53%, Al 2 o 3 7.81%, CaO 0.10%, MgO 1.22%, P 0.09%, S 0.04%

[0043] The reducing agent coal powder used contains 63% of fixed carbon by weight percentage, and the particle size -0.074mm accounts for 60%;

[0044] Device structure is with embodiment 1; Method is with embodiment 1, and difference is:

[0045] (1) The add-on of flux is 2.30 by the alkalinity after pre-reduced iron ore and flux are mixed;

[0046] (2) The amount of pulverized coal injected is based on the coal ratio = 300kg / t;

[0047] (3) The time for controlling the pre-reduced iron ore from entering the device to melting is 2h, and the temperature in the device is 1400°C;

[0048] The obtained molten iron contains Fe 96%, C 3.5%, P 0.04%, S 0.01%, Si 0.3%, Al 0.03% by mass percentage.

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Abstract

A device and method for producing molten iron through high-temperature smelting of pre-reduced iron ore. The device includes a furnace body, an electrode and a coal-fired spray gun. A raw material transport pipe is inserted into the furnace body; the upper space is provided with a high-temperature flue gas outlet, an electrode and a coal-fired spray gun. The bottom end of the electrode is located in the slag layer area, the slag discharge port is located in the slag layer space, and the molten iron outlet is connected to the molten iron layer area; the method is: (1) Mix and transport the pre-reduced iron ore and flux to the device, (2) Turn on the power And spray pulverized coal, pre-reduced iron ore and flux are melted to form a melt; (3) Iron oxide reacts with pulverized coal to generate molten iron and slag, and an electric arc is generated through the molten iron to further heat the molten iron; (4) The temperature during smelting is 1350 ~1550℃, after the end, open the slag discharge port to discharge the slag, and then open the molten iron outlet to discharge the molten iron. The method of the present invention realizes the coordinated utilization of energy consumption, greatly reduces the loss of energy consumption, and improves the energy utilization efficiency.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a device and method for producing molten iron by high-temperature smelting of pre-reduced iron ore. Background technique [0002] At present, blast furnace ironmaking, which uses coke, iron-containing ore (natural rich lump ore, sinter or pellet) and flux (limestone, dolomite) to continuously produce liquid pig iron in the vertical reactor-blast furnace, is a modern The main method of ironmaking, its output accounts for more than 95% of the world's total pig iron output, which means that the pollution and environmental problems caused by its use of coke production are still in a state of deepening; in response to this problem, relevant personnel should increase non-blast furnace The research and application of ironmaking technology, so as to improve the industrial structure of the development of my country's iron and steel industry. [0003] Unlike blast furnace ironmaking, non...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/10
Inventor 李艳军韩跃新余建文高鹏孙永升
Owner NORTHEASTERN UNIV LIAONING
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