CN216947095U - Molten iron pretreatment device outside melting reduction furnace - Google Patents

Abstract

A molten iron pretreatment device outside a smelting reduction furnace comprises a molten iron silicon adding device, an intermediate frequency furnace granular iron melting device and a molten iron desulphurization device, wherein a tapping chamber (2) of the smelting reduction furnace (1) is communicated with a molten iron runner (9), and the molten iron silicon adding device is arranged on the molten iron runner (9) and is used for adding silicon to molten iron; the molten iron runner (9) is communicated with a molten iron ladle (11), the molten iron desulphurization device comprises a composite desulphurization spray gun (12), the composite desulphurization spray gun (12) is arranged on the upper part of the molten iron ladle (11), and the intermediate frequency furnace granular iron melting device is communicated with the molten iron ladle (11) through a molten iron charging groove (15). The method has the advantages of small environmental pollution, accurate control of the temperature and components of molten metal and the like, and the produced molten iron enters the ladle, so that the yield of the molten iron can be obviously improved, and the economic benefit is improved.

Description

Molten iron pretreatment device outside melting reduction furnace

Technical Field

Embodiments of the present disclosure generally relate to the technical field of molten iron pretreatment, and more particularly, to an out-of-furnace molten iron pretreatment apparatus for a smelting reduction furnace.

Background

The molten iron pretreatment refers to a molten iron treatment process for removing impurity elements or recovering valuable elements before molten iron is added into a steel making furnace, and comprises molten iron desiliconization, desulfurization, dephosphorization (commonly called 'triple elimination'), molten iron vanadium extraction, niobium extraction, tungsten extraction and the like. In the conventional converter steelmaking method, due to high temperature and high oxidizability in the converter, the dephosphorization and desulfurization capability of the converter is limited. Therefore, in order to solve the contradictions, a molten iron pretreatment process is adopted between the modern blast furnace iron making and the converter steel making, and the molten iron before entering the converter for smelting is treated to remove impurity elements, so that the sources of ferrous metallurgy raw materials are enlarged, the quality of steel is improved, the varieties of converter steel making are increased, and the technical and economic indexes are improved. The adoption of the molten iron 'three-step' treatment can bring a series of advantages to converter steelmaking, such as reduction of lime slag-making materials required for removing silicon and phosphorus in the converter steelmaking blowing process, reduction of slag quantity, reduction of slag overflow and splashing and the like, reduction of erosion of the slag to a furnace lining, and remarkable improvement of the furnace life. Meanwhile, the blowing time of the converter is shortened, the productivity of the converter is improved, the iron loss is reduced, and the quality of molten steel is improved.

The molten iron produced by the technology has the characteristics of low phosphorus, low silicon and low harmful elements, but the sulfur content in the molten iron is higher in the oxidizing atmosphere at the upper part in the furnace, so that the molten iron needs to be subjected to molten iron desulphurization treatment outside the furnace. The silicon content of molten iron is low, in order to meet the requirements of downstream customers, a silicon adding device is required to be added for molten iron silicon increasing treatment, bagged silicon powder is directly pushed into a molten iron ditch manually for silicon increasing in the traditional method, the silicon powder utilization rate is low, the silicon increasing hit rate is unstable, excessive silicon powder is adhered to a molten iron bag, silicon powder is wasted, the quality of molten iron is unstable, and the labor intensity of workers is high. In addition, in order to increase the molten iron yield, a molten iron pretreatment apparatus, such as adding scrap steel to a ladle and melting granular iron into molten iron, is required. Therefore, the development of an apparatus for pretreating molten iron outside a smelting reduction furnace has become a problem to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a molten iron pretreatment device outside a smelting reduction furnace, which is used for solving the problems in the prior art.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:

a molten iron pretreatment device outside a smelting reduction furnace comprises a molten iron silicon adding device, an intermediate frequency furnace granular iron melting device and a molten iron desulphurization device, wherein a tapping chamber 2 of a smelting reduction furnace 1 is communicated with a molten iron runner 9, and the molten iron silicon adding device is arranged on the molten iron runner 9 and is used for adding silicon to molten iron; the molten iron runner 9 is communicated with a molten iron ladle 11, the molten iron desulphurization device comprises a composite desulphurization spray gun 12, the upper part of the molten iron ladle 11 is provided with the composite desulphurization spray gun 12, and the intermediate frequency furnace granular iron melting device is communicated with the molten iron ladle 11 through a hot metal charging groove 15.

Further, the device comprises a scrap steel adding device, wherein the scrap steel adding device comprises a scrap steel chute 16, and the scrap steel chute 16 is arranged at the upper part of the ladle.

Further, a ladle carriage is arranged at the lower part of the ladle 11, and the ladle carriage can move.

Further, the molten iron silicon increasing device comprises a silicon adding device 3, a silicon iron alloy hopper 4, a bin wall vibrator 5, a discharge hole 6, a vibratory feeder 7 and a discharging chute 8 from top to bottom in sequence, and the discharging chute 8 is communicated with an iron water channel 9.

Further, the end of the molten iron trough 9 is communicated with a ladle 11 through a swing chute 10.

Further, the intermediate frequency furnace granular iron melting device comprises an intermediate frequency electromagnetic induction heating furnace 13 and an electromagnetic induction coil 14.

The utility model has the advantages and effects that: according to the molten iron pretreatment device outside the smelting reduction furnace, the adding amount of the silicon-iron alloy can be accurately controlled through the molten iron silicon adding device outside the furnace, waste is reduced, the utilization rate of the silicon-iron alloy reaches over 90%, the working environment of workers can be improved, and the labor intensity of the workers is reduced. The sulfur content in the molten iron can be reduced to be below 0.010-0.020% by the molten iron composite blowing desulfurization device, and the requirement of high-purity pig iron is met. The granular iron is heated and melted by the medium frequency furnace device in an electromagnetic induction heating mode, the molten iron flows into the molten iron tank and the molten iron ladle by the tilting device, and the produced molten iron enters the molten iron ladle because the medium frequency induction furnace has the advantages of high heat efficiency, short smelting time, less burning loss of alloy elements, wide smelting material, less environmental pollution, capability of accurately controlling the temperature and components of molten metal and the like, so that the yield of the molten iron can be obviously improved, and the economic benefit is improved. The scrap steel adding device is additionally arranged on the ladle transport passage, scrap steel resources can be fully utilized, the yield of molten iron is improved, the simple and efficient adding mode is provided, two stations are arranged, one station is used for tapping, the other station is used for adding scrap steel, normal tapping is not influenced, and the ladle car is provided with the weighing device, so that the adding amount of the scrap steel can be controlled. The device has the advantages of simple design, convenient maintenance, safety and reliability.

Drawings

FIG. 1 is a schematic structural view of an external molten iron pretreatment apparatus for a smelting reduction furnace according to the present invention.

1-a smelting reduction furnace; 2-a tapping chamber; 3-a silicon feeder; 4-a ferrosilicon hopper; 5-a bin wall vibrator; 6-a discharge hole; 7-vibration feeder; 8-a blanking chute; 9-molten iron ditch; 10-a swing chute; 11-a ladle; 12-a composite desulfurization lance; 13-medium frequency electromagnetic induction heating furnace; 14-an electromagnetic induction coil; 15 adding iron groove-; 16-scrap chutes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the utility model without any inventive step, are within the scope of protection of the utility model.

The technical solution of the present invention will be further explained and illustrated with reference to the following specific examples.

Example 1

The molten iron pretreatment device outside the smelting reduction furnace comprises a molten iron silicon adding device, an intermediate frequency furnace granular iron melting device, a molten iron desulphurization device, a scrap steel adding device and the like. The device use process is as follows: molten iron produced by the smelting reduction furnace 1 enters a molten iron ditch 9 from a tapping chamber 2 in a pressurizing tapping mode, silicon is added by a silicon adding device 3 when tapping 1/3, and the molten iron enters a foundry ladle 11 through a swinging chute 10; beginning to fall the composite desulphurization spray gun 12 at the upper part of the ladle 11, and carrying out composite desulphurization on the passivation magnesium particles and the quicklime powder by using nitrogen as carrier gas; meanwhile, the granular iron is heated and melted into molten iron in the medium-frequency electromagnetic induction heating furnace 13, and then enters the ladle 11 through the iron charging groove 15; the ladle car transports the ladle 11 to the vicinity of the pig machine, the ladle is seated on the hydraulic tilting device by a crown block to carry out the molten iron casting, and the empty ladle of the ladle adds the scrap steel into the ladle through the scrap steel chute 16 in the return process.

Further, the molten iron silicon increasing device comprises a silicon adding device 3 which comprises a ferrosilicon alloy hopper 4, a bin wall vibrator 5, a vibration feeder 7 and a discharging chute 8. Add the ferrosilicon into hopper 4 with the overhead traveling crane, open bulkhead vibrator 5, vibratory feeder 7, control ferrosilicon addition volume, ferrosilicon evenly gets into iron runner 9 along unloading chute 8 from discharge opening 6, mends silicon for the molten iron.

Furthermore, the medium frequency furnace granular iron melting device is a medium frequency electromagnetic induction heating furnace 13, the inside of the furnace is made of refractory materials, and an electromagnetic induction coil 14 is wound on the furnace body to heat the furnace body. The method comprises the steps of putting conductive metal materials such as granular iron into a furnace, converting electric energy into heat energy, heating and melting the granular iron to form molten iron, and feeding the molten iron into a ladle 11 through a hot metal charging groove 15.

Further, the molten iron desulfurization apparatus is a composite desulfurization injection apparatus, the composite desulfurization spray gun 12 is positioned right above the ladle 11, and the molten iron starts to be desulfurized after the molten iron is discharged from the smelting reduction furnace 1. The compound desulfurization spray gun 12 is a liftable spray gun, the spray gun is lowered to the surface of the liquid surface, and the passivated particle magnesium and quicklime powder are sprayed into the ladle by using nitrogen as carrier gas to carry out molten iron desulfurization.

Further, the scrap charging device is located on the ladle transport line, and when the molten iron casting is completed, the scrap is charged into the ladle through the scrap chute 16 in the return process.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (6)

1. The molten iron pretreatment device outside the smelting reduction furnace is characterized by comprising a molten iron silicon adding device, an intermediate frequency furnace granular iron melting device and a molten iron desulphurization device, wherein a tapping chamber (2) of the smelting reduction furnace (1) is communicated with a molten iron runner (9), and the molten iron silicon adding device is arranged on the molten iron runner (9) and is used for adding silicon to the molten iron; the molten iron runner (9) is communicated with a molten iron ladle (11), the molten iron desulphurization device comprises a composite desulphurization spray gun (12), the composite desulphurization spray gun (12) is arranged on the upper part of the molten iron ladle (11), and the intermediate frequency furnace granular iron melting device is communicated with the molten iron ladle (11) through a molten iron charging groove (15).

2. The pretreatment apparatus for molten iron outside a smelting reduction furnace according to claim 1, further comprising a scrap adding means provided on the ladle transporting passage and having two stations, one for tapping and one for adding scrap, without affecting normal tapping; the scrap steel adding device comprises a scrap steel warehouse, an electromagnetic crane and a scrap steel chute (16), wherein the scrap steel chute (16) is arranged on the upper part of a ladle, and a dust removing device is arranged on the upper part of the tail end of the scrap steel chute (16).

3. The pretreatment apparatus for molten iron outside a smelting reduction furnace according to claim 2, wherein a ladle carriage is provided under the ladle (11) and is movable back and forth on the rail, and the ladle carriage has a weighing device for controlling the amount of scrap charged and discharged.

4. The pretreatment apparatus for molten iron outside a smelting reduction furnace according to claim 3, wherein the apparatus for adding silicon to molten iron comprises a silicon feeder (3), a ferrosilicon hopper (4), a bin wall vibrator (5), a discharge hole (6), a vibratory feeder (7), and a discharge chute (8) in this order from top to bottom, the discharge chute (8) is vertically connected to the molten iron bath (9), and the discharge chute (8) is provided at the front end 1/5 of the molten iron bath (9).

5. The pretreatment apparatus for molten iron outside a smelting reduction furnace according to claim 4, wherein a tip of the molten iron runner (9) is communicated with a ladle (11) through a swing chute (10).

6. The pretreatment apparatus for molten iron outside a smelting reduction furnace according to claim 5, wherein said intermediate frequency furnace for melting granular iron comprises an intermediate frequency electromagnetic induction heating furnace (13) and an electromagnetic induction coil (14); the intermediate frequency furnace is provided with a tilting device, the furnace can be tilted to pour molten iron, and the molten iron directly enters the ladle (11) through the iron charging groove (15).

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