WO2017061664A1 - Sintered ore manufacturing apparatus and manufacturing method - Google Patents

Abstract

A sintered ore manufacturing apparatus according to one embodiment of the present invention performs a sintering process by connecting a plurality of sintering trolleys in a caterpillar form and comprises: a material feeding part including an upper ore hopper and a surge hopper, which respectively feed upper ores and mixed materials into the sintering trolleys; an ignition furnace disposed at the rear end of the material feeding part in the progressing direction of the sintering trolleys so as to ignite a surface layer part of the mixed materials charged in the sintering trolley; and a microwave heating furnace disposed at the rear end of the ignition furnace so as to emit microwaves at the surface layer part of the mixed materials charged in the sintering trolley.

Description

Sintered Ore Manufacturing Equipment

The present invention relates to a sintered ore manufacturing apparatus and a manufacturing method, and more particularly, by minimizing the half-light generation of the upper layer of the sintered trolley by irradiating microwaves on the top of the sintered bogie, to improve the particle size of the sintered ore and increase the sintered ore recovery productivity It relates to a sintered ore manufacturing apparatus and a manufacturing method that can be improved.

Generally, the sintered ore used as a raw material in the blast furnace accounts for about 80% of the main raw material, the sintered ore is prepared by charging the raw material and the top light in the sintering apparatus and firing at high temperature.

FIG. 1 is a schematic view showing a sintering process using a general down suction sintering apparatus, and FIG. 2 is a view showing a recovery rate by sintering cart position of a conventional general down suction sintering apparatus.

As shown in Figure 1 and 2, the sintering process using a downward suction sintering apparatus is stored in the ore bin (ORE BIN) 10, and the iron ore, secondary raw materials, coke (Coke), and then cut out a certain amount of the drum mixer ( Water is added and mixed in the DRUM MIXER; 11) and stored in the SURGE HOPPER 12.

Subsequently, when the sintered trolley 15 into which the upper light is charged is moved through the upper light hopper 14, the drum feeder 13 absorbs moisture to the raw material discharged through the surge hopper 12 at the rear end of the upper light hopper 14. A compounding raw material is prepared by adding, and the compounding raw material prepared as described above is charged to the upper portion of the sintering cart 15 along the inclined plate (Deflector Plate) 16 to induce a classification phenomenon.

Thus, the sintered trolley | bogie 15 in which the compounding material loading was completed ignites the compounding material superficial layer part with the flame | hot flame of high temperature (about 1200 degreeC) in the ignition furnace 17, and operates the main blower 18, and generates a suction force.

The suction force is transmitted to the windbox 20 through the chamber 19, and the suction force transmitted to the windbox 20 strongly sucks the lower portion of the sintering cart 15 so that air in the air is charged into the sintering cart 15. Passing from the upper part to the lower part of the blended raw material, the iron ore is agglomerated by high temperature firing to produce a sintered ore.

Meanwhile, the sintered ore manufacturing process adopts a method of maximizing the quality of the sintered ore and maximizing recovery and productivity while minimizing fuel consumption. The downward suction type sintering apparatus continuously burns the combustion gas under the sintering cart 15. As the air is sucked, the cool air rapidly cools the upper layer formed from the plane of the blended material to one third depth with respect to the entire depth of the sintered bogie 15, so that the upper tier of the sintered bogie 15 occupies about one third of the manufactured sintered ore. As the sintered ore does not receive enough heat for sintering, a large amount of semi-glossy particles having a diameter of less than 5 mm is generated, which has a problem in that the recovery rate of the sintered ore is lowered.

In order to solve such problems in the related art, for the technique using microwave, "a method of manufacturing sintered ore (Korean Patent Publication No. 10-1995-0018555)", "a method of manufacturing a sintered ore (Japanese Patent Publication No. 1996-014763)", " Sintered ore blending material moisture removal device and method (Korea Patent Publication No. 10-2010-0026457).

However, all of the prior literatures use a microwave to heat the raw material to dry the moisture before charging the surface layer after loading the raw material into the sintering bogie to enhance the strength of the pseudoparticles, or to reduce the energy consumption during sintering by preheating. As the upper portion of the sintered trolley is rapidly cooled by the method, a large amount of semi-reflected light having a reduced size of the sintered ore particles in the upper portion is generated, and thus, the problem that the recovery rate of the sintered ore is reduced is not solved.

The present invention has been made to solve the above problems, it is charged into the sinter bogie and passed through the ignition furnace while irradiating microwaves to the plane of the compounding material complexed with the surface layer is supplied by supplying a heat source insufficient in the upper sinter bogie sintered condensation Provided is a sintered ore manufacturing apparatus and a manufacturing method that can improve the quality and recovery of the sintered ore by minimizing the generation of semi-glow.

In the sintered ore manufacturing apparatus according to an embodiment of the present invention in the sintered ore manufacturing apparatus that proceeds the sintering process by connecting a plurality of sintered trolley in an endless track, an upper light hopper for supplying the upper light and the blended raw materials to the sintered trolley respectively Raw material supply including a surge hopper; An ignition furnace disposed at a rear end of the raw material supply part in the advancing direction of the sintered bogie to complex the surface layer portion of the blended raw material charged into the sintered bogie; And a microwave heating furnace disposed at a rear end of the ignition furnace and irradiating microwaves to the surface layer portion of the blended raw material charged into the sintering cart.

The microwave heating furnace may be characterized in that for irradiating the microwave with a frequency of 800MHz ~ 3kHz.

The microwave heating furnace is preferably formed in a tunnel shape in which both ends are opened in the advancing direction of the sintering bogie so that the microwaves can be irradiated onto the surface of the blended material accommodated therein while the sintering bogie passes.

In the sintered ore manufacturing method according to an embodiment of the present invention, in the sintered ore manufacturing method using a downward suction sintering apparatus, the raw material supply step of supplying the top light and the blended raw material to the sintered trolley moving on the endless track; An ignition step of complexing the surface layer portion of the blended raw material charged into the sintering cart; And a heating step of heating the upper layer portion of the blended raw material by irradiating microwaves to the plane of the blended raw material on which the surface layer is ignited.

In the heating step, the microwave is preferably irradiated with a frequency of 800MHz ~ 3kHz.

The heating step may be characterized in that for irradiating the microwave for 10 seconds to 3 minutes.

According to an embodiment of the present invention, by supplying the heat energy required in the upper layer portion of the blended raw material charged in the sinter bogie without affecting the flow of the combustion gas using the microwave heating furnace, the sintered ore quality and recovery rate can be improved It works.

1 is a schematic view showing a sintering process using a conventional double-low suction sintering apparatus,

Figure 2 is a view showing the recovery rate for each position of the sintered cart of the conventional general down suction sintering apparatus

3 is a schematic view showing a sintered ore manufacturing apparatus according to an embodiment of the present invention,

4 is a view for explaining a microwave heating furnace, according to an embodiment of the present invention,

5 is a flowchart showing a sintered ore manufacturing method according to an embodiment of the present invention,

6 is a view showing a temperature distribution of a conventional general down suction sintering apparatus and a sintered ore manufacturing apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. For reference, in the present description, the same numbers refer to substantially the same elements, and may be described by referring to the contents described in the other drawings under these rules, and the contents determined to be obvious to those skilled in the art or repeated may be omitted.

3 is a schematic view showing a sintered ore manufacturing apparatus according to an embodiment of the present invention, Figure 4 is a view for explaining a microwave heating furnace, according to an embodiment of the present invention.

As shown in Figure 3 and 4, the sintered ore manufacturing apparatus according to an embodiment of the present invention is a raw material supply unit for supplying the raw material into the sintered trolley 15 is connected to a plurality of tracks in the orbit and each of the sintered trolley 15 And an ignition furnace 17 for igniting the surface layer portion of the raw material charged in the) and a microwave heating furnace 30 for irradiating the microwaves to the surface of the raw material charged in the sintering cart 15.

The raw material supplied into each of the sintered trolleys 15 is composed of a compound raw material stacked on top of the upper light and the upper light, and the raw material supply part is an upper portion of one side of the path along which the sintered trolley 15 moves along the running rail formed in an endless track. The upper light hopper 14 provided in the width direction of the sintering trolley | bogie 15 and the surge hopper 12 arrange | positioned at the rear end of the upper light hopper 14 are comprised.

The upper light hopper 14 charges the upper light having a particle size range of 10 to 15 mm in the sintering cart 15 to the sintering cart 15 with a thickness of about 50 mm, and the surge hopper 12 installed at the rear end has a predetermined amount of moisture. The added blending raw material is supplied to the sintering cart 15.

At this time, the surge hopper 12 is rotated the drum feeder 13 installed in the lower portion of the blended raw material contained in the surge hopper 12 is discharged into the sintering cart 15 and blended according to the rotational speed of the drum feeder 13 The discharge amount of the raw material is controlled, and a lower plate (Deflector Plate, 16) is installed at the lower part to induce the classification phenomenon of the mixed raw material is discharged from the surge hopper 12 along the inclined plate (16) It is charged into the sinter cart 15.

The ignition furnace 17 is provided with a plurality of burners spaced apart at regular intervals in the width direction of the sintering bogie 15 so as to ignite the surface layer portion of the blended material charged into the sinter bogie 15, and continuously The surface layer portions of the blended raw materials charged into the sintered trolleys 15 to be passed are sequentially fired.

The microwave heating furnace 30 is formed in a tunnel shape in which its bottom and both ends are open so that a plurality of sintering trolleys 15 can be continuously passed, and the raw material charged in the sintering trolley 15 passed below. Microwave oscillation means is installed on the ceiling to irradiate the microwaves to the surface layer.

In general, microwaves are a form of energy with a low frequency of electromagnetic energy and have a frequency range of 800 to 300,000 MHz, causing only the rotation of molecules within the electromagnetic field range and do not affect the molecular structure.

More specifically, the microwave is composed of an electric field and a magnetic field, of which the electric field serves to heat the material, propagates at the speed of light and the photon energy (0.037㎉ / mole) is the energy (80 ~ 120㎉ / It is lower than mole, so it only heats the material and does not affect the molecular structure.

Thus, the microwave heating furnace 30 according to the embodiment of the present invention replaces the conventional inefficient conventional heating method by using energy conduction heat, which is slow in energy transfer rate and takes a long time until thermal equilibrium of materials, thereby uniformizing internal and external temperatures. Investigate microwaves that can be heated quickly.

At this time, the frequency of the microwave used is preferably 800MHz ~ 3kHz, the reason is that when the frequency of the microwave exceeds 3kHz the cost is increased and the sintering temperature is excessively raised to improve the quality of the sintered ore produced If it is less than 800MHz, the depth penetrated into the blending material is increased, and the energy density decreases, so that the upper part of the blending material having semi-gloss with a particle size of less than 5 mm is not sufficiently heated, and heating takes a long time. to be.

division Chemical composition Temperature (℃) Hematite Fe ₂ O ₃ 1,000 Magnetite Fe ₃ O ₄ 700 Limonite mFe ₂ nH ₂ O 150 Limestone CaCO ₃ 200 Silica SiO ₂ 140

Table 1 is a table showing the temperature measured after 1 minute irradiation of microwave of 2 kW capacity, 2.4 kW for 1 minute with respect to the main components of the blended raw materials charged in the sintering cart.

As can be seen from Table 1, it is possible to heat the main components of the blended raw material in a short time when heating the blended raw material using the microwave, by irradiating the surface of the blended raw material charged in the sintered cart 15, microwaves By heating the upper part formed from the plane of the blended material to 1/3 depth for the total depth of (15) to compensate for the temperature cooled by the cold air as the continuous intake of the combustion gas under the sinter truck 15 There is an effect that can minimize the semi-light generation of the upper layer.

On the other hand, the microwave heating furnace 30 according to an embodiment of the present invention is preferably formed to a length that each sintering cart 15 can pass for 1 to 2 minutes.

This is because if the passage time of the sintered trolley 15 through which the length of the microwave passes below is less than 1 minute, the amount of semi-glossy cannot be sufficiently heated due to insufficient heating of the upper layer of the blended raw material charged into the sintered trolley 15. When it is formed to be heated for 2 minutes or more, the decrease in the amount of semi-light generation is insignificant compared to the increase in manufacturing cost, so that the length of the microwave heating furnace 30 is preferably formed such that the sintering cart 15 has a passage time of 1 to 2 minutes.

Microwave (2kW, 2.4㎓) irradiation time Half light generation rate - 33.2% 1 min 25.8% 2 minutes 19.8%

Table 2 is a table showing the rate of semi-glow generation according to the microwave irradiation conditions, in the present invention, after the surface of the 120kg blended material is ignited using a flame and irradiated with microwaves (2kW, 2.4㎓) to heat the upper layer, The combustion gas was aspirated at a pressure of 1,600 mmHq from below, and after combustion was completed, the sample was crushed to 50 mm or less, and the drum strength was measured.

As can be seen from Table 2, when irradiating microwaves for 1 minute, the amount of semi-glow is reduced by about 7.4%, and when irradiated for 2 minutes, the amount of semi-glow is reduced by 13.4%, compared to the conventional down suction sintering apparatus that does not irradiate microwaves. It can be seen that the amount of semi-light generated can be significantly reduced.

Microwave (5kW, 2.4㎓) irradiation time Half light generation rate - 33.2% 10 sec 30.7% 30 seconds 24.4% 60 seconds 18.5%

Table 3 is a table showing the half light generation ratio according to the irradiation time when the microwave power is increased to 5 kW, it can be seen that the half light generation ratio decreases rapidly in a short time compared to 2 kW of Table 2.

Therefore, it can be seen from the measurement results of Tables 2 and 3 that the irradiation time can be significantly reduced as the microwave power increases.

A sintered ore manufacturing method using a sintered ore manufacturing apparatus according to an embodiment of the present invention configured as described above will be described with reference to the drawings.

5 is a flowchart showing a sintered ore manufacturing method according to an embodiment of the present invention.

As shown in FIG. 5, the sintered ore manufacturing method according to an embodiment of the present invention includes a raw material supplying step, an ignition step of complexing the surface of the blended raw material, and a heating step of irradiating microwaves to the surface layer of the blended raw material.

In the raw material supplying step, the upper light hopper 14 and the surge hopper 12 are sequentially supplied to the inside of the sintered trolley 15 which is moved on the track.

When the raw material supply is completed into the sintered trolley 15, the sintered trolley 15 loaded with the raw materials passes through the ignition furnace 17 to ignite the surface layer portion of the blended raw material contained therein.

6 is a view showing the temperature distribution (a) of the conventional general down suction sintering apparatus and the temperature distribution (b) of the sintered ore manufacturing apparatus according to an embodiment of the present invention.

As shown in Figure 6, the sintered ore manufacturing method according to an embodiment of the present invention, when the surface layer ignition is completed, the microwave is 800MHz ~ 3 kHz at the surface layer portion of the blended raw material charged in the sintered cart 15 in the heating step Irradiate for 1 to 2 minutes to heat the upper layer of the blended raw material.

Therefore, the cooling temperature can be compensated by continuously inhaling the combustion gas from below to compensate for the cooling temperature of the upper part of the blended raw material, thereby supplying the heat energy necessary for the upper part of the blended raw material charged in the sintered bogie 15, thereby improving the sintered ore quality and recovery rate. There is an effect to improve.

In addition, heating by using a microwave does not affect the flow of the combustion gas has the effect of making the quality of the sintered ore produced uniformly, improving the productivity.

When the heating of the upper portion of the blended raw material is completed as described above, the main blower 18 is operated to generate a suction force under the sinter truck 15 to produce a sintered ore while sucking the combustion gas.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

[Description of the code]

10: ore hollow 11: drum mixer

12: Surge Hopper 13: Drum Feeder

14: upper light hopper 15: sintered trolley

16: tilt plate 17: ignition furnace

18: main blower 19: chamber

20: windbox 30: microwave furnace

Claims (6)

In the sintered ore manufacturing apparatus that connects a plurality of sintered trolleys on the track, A raw material supply unit including an upper light hopper and a surge hopper for respectively supplying upper light and a blended raw material to the sintered cart; An ignition furnace disposed at a rear end of the raw material supply part in the advancing direction of the sintered bogie to complex the surface layer portion of the blended raw material charged into the sintered bogie; And And a microwave heating furnace disposed at a rear end of the ignition furnace and irradiating microwaves to the surface layer of the blended raw material charged into the sintering cart. The method according to claim 1, The microwave heating furnace, Sintered ore manufacturing apparatus, characterized in that for irradiating microwaves with a frequency of 800MHz ~ 3kHz. The method according to claim 1, The microwave heating furnace, Sintered ore manufacturing apparatus, characterized in that formed in a tunnel shape in which both ends are opened in the advancing direction of the sintered bogie so that the microwaves can be irradiated to the surface of the blended material contained therein while the sintered bogie passes. In the method of manufacturing a sintered ore using a downward sintering apparatus, A raw material supply step of supplying the upper light and the blended raw materials to the sintered trolley moving on the endless track; An ignition step of complexing the surface layer portion of the blended raw material charged into the sintering cart; And And a heating step of heating the upper layer of the blended material by irradiating microwaves to the plane of the blended material ignited at the surface layer. The method according to claim 4, The heating step, A method of producing a sintered ore, characterized by irradiating a microwave having a frequency of 800 MHz to 3 kHz. The method according to claim 5, The heating step, Sintered ore manufacturing method characterized in that for irradiating the microwave for 10 seconds to 3 minutes.

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