JP2018048383A - Sintering device and sintering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sintering device capable of correctly simulating the conditions of raw material charge than a sintering pot device, and smaller than a semi-continuous type DL type sintering device, and a sintering method using the same.SOLUTION: Provided is a sintering device 100 comprising: a rail 43 in which a standby part 43A, a raw material charge part 43B, an ignition part 43C and a sintering part 43D are straightly arranged; a pallet truck group 12 provided with the rail 43 so as to be reciprocated; a driving apparatus running the pallet truck group 12; an electric drive car 21 provided at the upper part of the raw material charge part and charging sintering raw material to the pallet truck group 12; an ignition furnace 13 provided at the upper part of the ignition part 43C and igniting the sintering raw material 8; a wind box 40 provided at the lower part of the rail 43 of the ignition part 43C and the sintering part 43D and sucking the air in the pallet truck group 12; a wind leakage cover 32 provided before and after the running direction of the pallet truck group 12; and a dead plate 33A movably abutted against the wind leakage cover 32.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sintering apparatus and a sintering method.

  For iron ore sintered ore, granular granulated raw material called compounding raw material is filled in a pallet truck with a grate structure at the bottom to a layer height of about 650 mm, and the inside of the packed bed is ventilated from below the grate using a suction blower Manufactured by doing.

  The blended raw material (hereinafter also simply referred to as “raw material”) is produced by blending iron ore with a solvent such as limestone and coke serving as a heat source, adding water, and rolling and granulating into an average particle size of about 4 mm. .

  When the coke in the surface layer portion is ignited by the ignition furnace in which the gas fuel is burned at a high temperature, the combustion heat of the coke in the blended raw material is generated by the air sucked from the surface layer. The packed bed is heated to about 1300 ° C. due to heat generation, and the iron ore is partially melted to form a sintered cake.

The sintering reaction process proceeds from the upper surface layer portion of the raw material layer in the pallet truck toward the lower bottom portion, and takes about 30 minutes during that time. The produced sintered cake is discharged from the pallet truck, and then crushed / classified to 50 mm or less by a crusher, and the sintered mineral product is recovered.
As an apparatus for carrying out these manufacturing processes, a DL (dwightroid) sintering machine is known.

  The DL-type sintering machine has a pallet carriage that is continuously connected and moves forward. The blended raw material is charged into a pallet truck at the feed end, ignited through an ignition furnace, and sintered while being sucked by moving over a wind box. When the pallet truck comes to the discharge end, it tilts downward and then reverses to the supply end via the lower line. The sintered cake of the pallet truck inverted at the discharge end is discharged, roughly crushed by a crusher, cooled, crushed and classified, and the sinter is collected.

  In the production of sintered ore using a DL-type sintering machine, the properties of raw materials such as iron ore, limestone and coke have a great influence on the sintering operation and the quality of the sintered ore. Since iron ore is a natural product, its particle size, chemical composition, and other properties are not always constant. When the properties of iron ore fluctuate, the sintering operation and the quality of the ore also fluctuate.

  The equipment conditions of the sintering machine, such as changing the specifications of the chute for charging the raw material, have a great influence on the sintering operation and quality through the influence of the raw material particle size distribution in the pallet truck. In particular, in the DL type sintering machine, since the pallet carriage is sucked and blown while moving, even if a sealing mechanism for preventing air leakage is provided, there are 30% of air leakage, pressure loss of the exhaust gas, The composition is also affected. The state of the air leakage sealing varies depending on the wear and aging of the sealing material, and the pressure loss of the exhaust gas, the air volume and the composition also vary.

  These fluctuation effects can be extracted and analyzed by conducting tests using commercial DL-type sintering machines and analyzing operational results. However, it is difficult to interrupt commercial sinter production for testing. Therefore, for the purpose of simulating a DL-type sintering machine, it is common to provide a test apparatus separately from a commercial DL-type sintering machine.

  As such an apparatus, a batch-type sintering pot apparatus (POT type) is widely used. The test procedure using the sintering pot apparatus is as follows. First, raw materials such as iron ore are blended and granulated to produce a blended raw material of about 60 kg, and this blended raw material is charged into a vertical cylindrical container called a sintering pot. Next, the surface of the raw material layer is roasted by an ignition burner for about 1 minute to ignite the surface layer coke, and a sintered cake is produced while venting through a wind box connected to a suction blower provided at the bottom of the sintering pan. Finally, the sintered cake is taken out and evaluated (Patent Document 1, Patent Document 2, and Patent Document 3).

  Since the sintering pot apparatus sinters with an apparatus different from the actual machine, there is an advantage that the sintering operation and the quality of the sintered ore can be investigated without disturbing the production of the actual machine. Furthermore, since the pan can be fixed to the wind box, the seal between the wind box and the pan can be performed perfectly, and there is also an advantage that there is no influence of the leaking air that becomes a disturbance.

  However, since a wall surrounding the blended sample exists in the sintering pan apparatus, there is no function of forming a distribution in the height direction similar to that of forming a slope classification with a moving pallet truck. Therefore, there is a problem that the raw material charging state of the DL type sintering machine cannot be simulated in the sintering pot device.

In order to avoid this problem, using a charging device having a chute structure similar to that of the DL-type sintering machine, a loading test on the pallet truck with the blended raw material was carried out, and after loading, the partition plate was machined A method of making it into a sintered pot by penetrating it is proposed (Patent Document 4).
The method described in Patent Document 4 can simulate the distribution of the raw material in the height direction, but has a problem that the packing density and the like of the raw material around the partition plate is changed.

  As an apparatus that has solved the disadvantages of the sintering pot, a sintering apparatus is known in which the pallet cart is not continuous endless but semi-continuous up to the end of the discharge. This apparatus is advantageous in that the raw material distribution and the packing density in the height direction can be simulated more accurately than the sintering pot (Non-Patent Document 1).

JP 59-13034 A Japanese Utility Model Publication No.59-52445 Japanese Utility Model Publication No. 58-181826 JP 2014-88597 A

Kawaguchi, Sato, Kato, “Low limit of two-stage ignition sintering process and sintering firing energy”, Sumitomo Metals, Vol. 44-1, 1992, p13-25

  However, the semi-continuous sintering apparatus described in Non-Patent Document 1 requires a length corresponding to the distance traveled by the pallet truck until the sintering is completed, and there is a problem that the apparatus is enlarged. .

  The present invention has been made in view of the above problems, and can accurately simulate the raw material charging situation as compared with a sintering pot apparatus, and uses a sintering apparatus smaller than a semi-continuous sintering apparatus and the same. An object is to provide a sintering method.

  A sintering apparatus according to the present invention includes a rail in which a standby portion, a raw material charging portion, an ignition portion, and a sintering portion are linearly arranged, a pallet cart that is provided so as to be able to travel on the rail, and the pallet cart. A driving device for running, a raw material charging device provided above the raw material charging portion and charging a sintered raw material into the pallet cart, and provided above the ignition portion and charged into the pallet cart. An ignition furnace for igniting an upper layer of the sintered raw material, a wind box provided below the rail of the ignition part and the sintering part, and sucking air in the pallet truck from below the pallet truck; An air leakage cover provided before and after the traveling direction of the pallet truck, and a dead plate that movably contacts the air leakage cover and prevents the air leakage from entering the wind box. Features.

According to this invention, since the pallet carriage is moved until the raw material ignition, the raw material distribution and the filling density in the height direction can be simulated more accurately than the sintering pot.
In addition, since the pallet truck is stopped on the wind box after ignition and sealed with dead plates and lids for sintering, the length in the direction in which the pallet truck travels can be shortened compared to the semi-continuous sintering machine. Sintering can be performed with a simulation accuracy equivalent to or higher than that of a sintering pan.

In the present invention, three or more pallet trolleys are connected to form a pallet trolley group, and the wind box is provided below the igniter, and the pallet trolley 1 A first wind box having a length corresponding to the length of the pallet truck in the running direction and the length of the pallet truck group in the running direction is provided in the sintered portion. And a second wind box.
According to the present invention, since the sum of the lengths of the wind boxes in the sintered portion is the length of the entire pallet carriage group, the length in the traveling direction is shorter than that of the conventional semi-continuous DL type sintering apparatus. it can.

In the present invention, charging control means for controlling the driving device and the raw material charging device so that the sintered raw material is charged into the pallet cart group while moving the pallet cart group, and the pallet cart group. The drive unit, the ignition furnace, and the first wind box so as to apply a negative pressure to the first wind box and to ignite the sintered raw material. Ignition control means for controlling, moving the pallet carriage group to the sintering portion in a state where the sintering raw material is ignited, stopping application of negative pressure by the first wind box, and second wind box And a suction control means for controlling the driving device and the wind box so as to apply a negative pressure to the control unit.
According to the present invention, the control unit automatically performs a series of operations for moving the pallet truck until ignition of the raw material, stopping the pallet truck on the wind box after ignition, and performing sintering, so that the workability is excellent.

In this invention, the structure which does not have a partition in the edge part adjacent to the pallet truck located in an edge part about the pallet trucks other than the said edge part can be considered.
According to this invention, since the partition wall that affects the packing density at the time of charging the blended raw material is provided only in the pallet trucks at both ends, the blended raw material charged in the pallet truck other than the pallet trucks at both ends is The charging state is not affected by the partition wall, and the charging state can be accurately simulated.

In this invention, you may have a biasing means to bias the said dead plate upwards.
According to this invention, when the dead plate comes into contact with the lid or the pallet carriage, the urging means is brought into close contact with each other, so that air leakage can be prevented more reliably.

In the present invention, the drive device may be a device that reciprocates the pallet carriage.
According to this invention, two or more stages of multi-stage ignition sintering can be performed by repeating the charging of the raw material and the ignition of the raw material while reciprocating the pallet carriage.

In the present invention, the raw material charging device includes a raw material surge tank for storing the sintered raw material, a raw material cutting device for cutting out the sintered raw material stored in the raw material surge tank, and the raw material cutting device. There may be a chute that serves as a guide when the sintered raw material cut out from is put into the pallet carriage.
According to this invention, since the raw material charging apparatus can be configured in the same manner as the continuous DL type sintering apparatus, the charging state can be simulated more accurately.

In the present invention, one main pipe, a plurality of branch pipes that connect the main pipe and the wind box, a blower that is connected to the main pipe and applies a negative pressure to the wind box, and an open / close that opens and closes the branch pipe And a valve.
According to this invention, since the application of the negative pressure to the wind box can be finely adjusted with the on-off valve, the sintering operation can be performed more accurately.

  In the sintering method of the present invention, the standby part, the raw material charging part, the ignition part, and the pallet carriage provided on the rail in which the sintering part is linearly arranged are moved from the standby part to the raw material charging part. Charging the pallet truck while charging the sintering raw material, and the upper layer of the sintered raw material charged into the pallet truck while moving the pallet truck from the raw material charging section to the ignition section An ignition step of igniting the pallet carriage, and the pallet carriage is moved from the ignition section to the sintering section and stopped at the sintering section, and the sintering raw material is sintered while applying a negative pressure from under the pallet carriage. And a sintering step for performing sintering.

  According to this invention, the pallet carriage is moved until the raw material ignition at the time of sintering, and the pallet truck is stopped on the wind box after the ignition to perform sintering. It can be simulated more accurately than the sintering pot device, and the required installation area can be reduced as compared with the semi-continuous DL type sintering device.

The schematic diagram which shows the sintering apparatus which concerns on embodiment of this invention. The enlarged view of the pallet truck group of FIG. The figure explaining the sintering method using the sintering apparatus which concerns on embodiment of this invention. The figure explaining the sintering method using the sintering apparatus which concerns on embodiment of this invention. The figure explaining the sintering method using the sintering apparatus which concerns on embodiment of this invention. The figure explaining the sintering method using the sintering apparatus which concerns on embodiment of this invention. The figure explaining the sintering method using the sintering apparatus which concerns on embodiment of this invention. It is a figure which shows the sintering test result using the sintering apparatus which concerns on embodiment of this invention, Comprising: It is a figure which shows the relationship between the height of a sintered layer, a product yield, and rotational strength. It is a figure which shows the sintering test result using the sintering apparatus which concerns on embodiment of this invention, Comprising: It is a figure which shows the relationship between the height of a sintered layer, a reduction | restoration powdering rate, and a reducibility. It is a figure which shows the sintering test result using the sintering apparatus which concerns on embodiment of this invention, Comprising: It is a figure which shows the relationship between C., FeO, and a particle size. It is a figure which shows the sintering test result using the sintering apparatus which concerns on embodiment of this invention, Comprising: It is a figure which shows the time change of the temperature, flow volume, and pressure of sintering exhaust gas. It is a figure which shows the sintering test result using the sintering apparatus which concerns on embodiment of this invention, Comprising: It is a figure which shows the time change of a sintering exhaust gas composition.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
First, the configuration of the sintering apparatus according to the present embodiment will be described with reference to FIGS. 1 and 2.

  A sintering apparatus 100 shown in FIG. 1 is an apparatus for sintering iron ore sintered ore, and includes a rail 43, a pallet carriage group 12, an electric drive vehicle 21, a raw material blending device 50, and a raw material charging device. 60, ignition furnace 13, wind box 40, air leakage cover 32, and dead plates 33A and 33B.

  The rail 43 is a rail that serves as a guide when the pallet carriage group 12 moves, and a standby part 43A, a raw material charging part 43B, an ignition part 43C, and a sintering part 43D are linearly arranged. The rail 43 is provided with a retracting portion 43E adjacent to the sintered portion 43D as necessary.

The pallet trolley group 12 is a combination of trolleys provided with wheels in a box in which the sintered raw material 8 is charged. The pallet carriage group 12 can travel on the rail 43 and can reciprocate in the directions of A1 and A2.
The electric drive vehicle 21 is a drive device that causes the pallet carriage group 12 to travel.

  In FIG. 2, the pallet carriage group 12 includes three pallet carriages 12 </ b> A, 12 </ b> B, and 12 </ b> C, and each is connected by a pin (not shown) in the reciprocating direction of the rail 43. The pallet carriage group 12 may be composed of four or more.

  An electric drive wheel 21 is provided at the end of the pallet carriage 12A. An air leakage cover 32 is provided at the end of the pallet carriage 12C. The electric drive wheel 21 has a flat bottom surface and also serves as an air leakage lid.

  As shown in FIG. 2, the pallet carriage 12 </ b> A and the pallet carriage 12 </ b> B do not have partition walls at the end portions 55 adjacent to each other. The pallet carriage 12B and the pallet carriage 12C do not have partition walls at the end portions 57 adjacent to each other. The pallet carriage 12A and the pallet carriage 12C have partition walls at end portions 53 and 51 that are not adjacent to other pallet carriages.

  The raw material blending device 50 is a portion that mixes the sintered raw material 8 and charges it into the pallet carriage group 12, and is provided above the raw material charging portion 43B. Since the composition of the raw material blending apparatus 50 is the same as that of the continuous DL-type sintering apparatus, the charging state can be simulated more accurately.

  Specifically, the raw material blending device 50 includes an iron ore storage unit 1, a limestone storage unit 2, a coke storage unit 3, a belt conveyor 4, a weighing hopper 22, a drum mixer 6, a water supply nozzle 7, and a belt conveyor 9.

  The iron ore storage unit 1, the limestone storage unit 2, and the coke storage unit 3 are devices for storing iron ore, limestone, and coke, which are raw materials of sintered ore, respectively.

  The belt conveyor 4 is a conveyor that conveys iron ore, limestone, and coke cut out from the iron ore storage unit 1, the limestone storage unit 2, and the coke storage unit 3 to the weighing hopper 22.

The weighing hopper 22 is a hopper that weighs iron ore, limestone, and coke, and is provided below the end of the belt conveyor 4 in the conveying direction.
The drum mixer 6 mixes and granulates iron ore, limestone, and coke. The water supply nozzle 7 is a nozzle for pouring water into the drum mixer 6 during granulation, and the water injection port is directed toward the inside of the drum mixer 6.

The belt conveyor 9 is a conveyor that conveys the granulated raw material from the drum mixer 6 to the raw material charging device 60. The raw material charging device 60 includes a surge hopper 10, a roll feeder 10 </ b> A, and a charging chute 11. The configuration of the raw material charging device 60 is the same as that of the continuous DL type sintering device, so that the charging state can be simulated more accurately.
The surge hopper 10 is a hopper (raw material surge tank) that stores the sintered raw material 8 immediately before charging into the pallet carriage group 12.
The roll feeder 10A is a raw material cutting device that cuts out the sintered raw material 8 from the surge hopper 10, and is a rotary feeder here.

  The charging chute 11 is a comb-shaped guide for charging the sintered raw material 8 into a predetermined position of the pallet truck group 12, and the pallet truck group 12 is adjusted according to the particle size of the raw material by adjusting the interval between the combs. Change the loading position and adjust the particle size distribution in the height direction.

The ignition furnace 13 is a furnace that ignites the surface layer of the raw material charged in the pallet carriage group 12, and is provided above the ignition unit 43C. The ignition furnace 13 is a furnace for burning gas fuel at a high temperature, for example.
The wind box 40 is a member that sinters the charged raw material from the upper layer toward the lower layer by sucking the air in the pallet cart group 12 from below the pallet cart group 12. The air box 40 is provided above the raw material charging part 43B, the ignition part 43C, and the sintering part 43D.

The wind box 40 is a box whose upper and lower ends are opened, for example. The wind box 40 is connected to the duct 34.
The wind box 40 includes wind boxes 40-1 to 40-5.
Among these, the wind box 40-2 is provided in the ignition part 43C as a 1st wind box. The length of the wind box 40-2 is a length corresponding to the length of the traveling direction of the pallet carriage 12B (directions A1 and A2 in FIG. 1).
The wind boxes 40-3 to 40-5 are a plurality of wind boxes provided as second wind boxes in the sintered portion 43D. The length of each of the wind boxes 40-3 to 40-5 is a length corresponding to the length of one of the pallet carriages 12B. In other words, since the entire length of the second wind box requires only the length of the pallet carriage group 12, the sintering apparatus 100 is smaller than the conventional semi-continuous DL type sintering apparatus.

The duct 34 has branch pipes 17-1 to 17-5 connected to the wind boxes 40-1 to 40-5, respectively, and one main pipe 31 connecting the branch pipes 17-1 to 17-5.
A blower 15 that applies a negative pressure to the wind box 40 is connected to the main pipe 31.
The branch pipes 17-1 to 17-5 are provided with on-off valves 16-1 to 16-5, respectively. The on-off valves 16-1 to 16-5 are valves that open and close the branch pipes 17-1 to 17-5.

The dead plates 33A and 33B are members that abut against the air leakage cover 32 so as to be movable and prevent the air leakage from entering the wind box 40, and are, for example, steel plates.
On the bottom surfaces of the dead plates 33A and 33B, springs 34A and 34B are provided as urging means for urging the dead plates 33A and 33B upward.
The springs 34A and 34B are members for ensuring the contact between the air leakage lid 32 and the dead plates 33A and 33B.

  The sintering apparatus 100 also has a control unit 200. The control unit 200 also serves as a charging control unit that performs control during charging of the sintered raw material 8, an ignition control unit that performs control during ignition, and a suction control unit that performs control during sintering.

  The control unit 200 includes an electric drive vehicle 21, a raw material mixing device 50 (iron ore storage unit 1, limestone storage unit 2, coke storage unit 3, belt conveyor 4, weighing hopper 22, drum mixer 6, water supply nozzle 7, and belt conveyor 9). The raw material charging device 60 (surge hopper 10, roll feeder 10A), ignition furnace 13, on-off valves 16-1 to 16-5, and blower 15 are connected to be communicable in a wired or wireless manner, and control their operations. To do.

  The above is description of the structure of the sintering apparatus 100 which concerns on this embodiment.

  Next, a sintering method using the sintering apparatus 100 according to the present embodiment will be described with reference to FIGS. 1 and 3 to 7.

  First, the control unit 200 drives the electric drive vehicle 21 to move the pallet carriage group 12 to the standby unit 43A as shown in FIG.

Next, the control unit 200 drives the raw material blending device 50 to granulate the raw material. Specifically, the following processing is performed.
First, iron ore, limestone, and coke stored in the iron ore storage unit 1, the limestone storage unit 2, and the coke storage unit 3 are cut out on the belt conveyor 4 and weighed according to a predetermined blending amount by the weighing hopper 22.
Each measured raw material is put into the drum mixer 6, and the drum mixer 6 is rotated and granulated while pouring water from the water supply nozzle 7 to obtain a sintered raw material 8. After the granulation treatment, the sintering raw material 8 is sampled if necessary.
The granulated sintered raw material 8 is put into a surge hopper 10 via a belt conveyor 9.

  When a predetermined amount of the sintered raw material 8 is charged into the surge hopper 10, the control unit 200 drives the electric drive vehicle 21 to move the pallet truck group 12 from the standby unit 43A to the raw material charging unit as shown in FIG. 43B. The control unit 200 drives the roll feeder 10A of the raw material charging device 60 while moving the pallet cart group 12, and charges the sintered raw material 8 into the pallet cart group 12 passing through the raw material charging unit 43B. (Charging process).

When the pallet carriage group 12 charged with the sintering raw material 8 continues to move and enters the ignition unit 43C, the control unit 200 drives the ignition furnace 13 as shown in FIG. Ignite (ignition process).
At this time, the control unit 200 drives the blower 15 to open the on-off valves 16-1 to 16-5. Thereby, a negative pressure is given to the wind boxes 40-1 to 40-5.

  When the pallet cart group 12 that has been ignited continues to move and all of the pallet carts 12A, 12B, and 12C enter the sintering portion 43D, the control unit 200 stops the electric drive vehicle 21 at the sintering position, and the pallet carts 12A, 12B, 12C is stopped at the sintered part 43D.

In this state, the control unit 200 closes the on-off valves 16-1 and 16-2 as shown in FIG.
As the pallet trucks 12A, 12B, and 12C are sucked from the wind boxes 40-3, 40-4, and 40-5, the sintering of the sintered raw material 8 proceeds from the upper layer toward the lower layer (sintering step). The sintering time is desirably about the same as that of a continuous DL type sintering machine, for example, about 30 min.
At this time, air leakage is prevented by bringing the dead plate 33A and the air leakage lid 32 into contact with each other.

  When the sintering is completed, the control unit 200 closes all the on-off valves 16-1 to 16-5, and stops the driving of the blower 15 as necessary. The control unit 200 drives the electric drive vehicle 21 again to move the pallet carriage group 12 from the sintering unit 43D to the retracting unit 43E.

Finally, as shown in FIG. 6, pins (not shown) that connect the pallet trucks 12A, 12B, and 12C are pulled out and separated from each other, and only the sintered layer 62 on the pallet truck 12B is roughly crushed by the rock drill 17; Crush and classify and collect sintered ore.
Since the pallet carriage 12B is not provided with a partition wall in the traveling direction, the charging state is not affected by the partition wall, and the charging state can be accurately simulated.

  The above is description of the sintering method using the sintering apparatus 100 which concerns on this embodiment.

Although the above description of the sintering method is a description of one-stage ignition sintering, the sintering apparatus 100 can also perform two-stage ignition sintering by reciprocating the pallet carriage group 12.
Specifically, the charging amount at the time of charging the raw material shown in FIG. 3 is set to about a half amount, and after ignition, the pallet carriage group 12 is not stopped by the sintering unit 43D, but the pallet carriage group 12 is moved backward in the direction of A2 to wait for 43A Then, it is moved again in the direction of A1, the raw material is charged and ignited, and sintering is performed in the sintering portion 43D.

  In the above description, only the sample after sintering is sampled, but the sample before sintering can also be sampled. Specifically, after the raw material is charged, the pallet carriage group 12 is not ignited and is moved backward in the direction of A2, and is returned to the standby unit 43A as shown in FIG. 7, and the sampling tube 18 is charged into the raw material layer to perform sampling. Just do it.

  Thus, according to the present embodiment, since the sintering apparatus 100 moves the pallet carriage group 12 until the raw material ignition, the raw material distribution and the packing density in the height direction are more accurately DL than the sintering pot apparatus. Can be simulated in a mold sintering machine.

  In addition, the sintering apparatus 100 stops the pallet carriage group 12 on the wind boxes 40-3 to 40-5 after ignition, and performs sintering by sealing with the dead plate 33A and the air leakage cover 32. Therefore, it is smaller than the semi-continuous DL type sintering apparatus, and can be sintered with a simulation accuracy equal to or higher than that of the sintering pot apparatus.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to an Example.

<Example 1>
A sintering test was performed using the sintering apparatus 100, and the charging characteristics in the height direction of the sintered body and the characteristics of the sintered exhaust gas were evaluated. The specific procedure is as follows.

  First, iron ore, limestone, and coke were cut out from the iron ore storage part 1, the limestone storage part 2, and the coke storage part 3, respectively, and put into the measurement hopper 22, and the compounding quantity shown in Table 1 was measured.

  After measuring 3 brands, all raw materials of the weighing hopper 22 are put into a batch type drum mixer 6 (inner diameter: 1.0 m, length: 3.0 m, tilt: horizontal, rotation speed: 20 rpm), and mixed for 4.0 min. Processed. A portion of the blended raw material was sampled to measure the moisture content, and water was prepared in such an amount that the water content of the granulated raw material was 7.0%. Again, the prepared water was added while rotating the drum mixer 6, and granulation was performed for 4.0 min. After granulation, a part of the granulated raw material was sampled. Next, the granulated raw material was put into the surge hopper 10 to prepare a blended raw material for testing. The above operation was performed once again to prepare a total of 1.4t of blended raw materials. A roll feeder 10A having a width of 0.4 m was attached to the lower portion of the surge hopper 10 and adjusted so that the raw material could be cut out at a speed of 150 t / h / m. A charging chute 11 (inner width 0.4 m, effective length 1.5 m) was set between the pallet carriage group 12.

  On the other hand, one pallet truck 12A with an inner width of 0.4m, a length of 0.8m, and an effective height of 0.6m, two pallet trucks 12B, one pallet truck 12C, and a total of four connected by pin coupling The pallet cart group 12 was prepared. An electric drive vehicle 21 is connected to the end of the pallet carriage group 12. The pallet carriage group 12 can be moved forward and backward (reciprocated) by the coupling pin and the electric drive vehicle 21.

  The pallet truck group 12 was retracted to the standby part 43A, and the pallet truck group 12 was advanced and stopped until the tip of the top pallet was positioned at the charging chute end.

  Next, after laying bedding ore (average particle size 10 to 15 mm, thickness 40 mm) on the pallet carriage group 12, the blended raw material is cut out from the roll feeder 10A and moved at a speed of 2.0 m / min. Raw materials were charged into the pallet truck group 12 via the input chute 11. When the raw material charging was completed, the raw material supply from the roll feeder 10A was stopped, and the pallet truck group 12 was stopped.

  Next, the pallet carriage group 12 was moved backward, and the charging raw material was sampled using the sampling tube 18 from the last pallet. The sampling hole and the space formed at the front and rear ends of the pallet carriage group 12 were filled with the remaining charging material so that all layers had substantially the same layer thickness.

Next, after operating the blower 15 and igniting the ignition furnace 13, the pallet carriage group 12 charged with raw materials was advanced to pass through the ignition furnace 13.
When the pallet carriage group 12 passed, the ignition furnace 13 was extinguished, and the pallet carriage was stopped at the sintering portion 43D.

Immediately after the vehicle stopped, the wind boxes 40-3, 40-4, and 40-5 were brought into pressure contact with the lower end of the pallet carriage group 12 and were subjected to a wind leak seal.
In this state, blowing was continued until the sintered cake reached room temperature. After the cooling was completed, the sintered cake was cut with a rock drill 17 and separated in units of pallet trucks. The sintered cakes of the pallet trucks 12A and 12C at both ends were discarded, and the sintered cakes were collected from the remaining two intermediate pallet trucks 12B, and tested for product yield and rotational strength.

The results are shown in FIG. 8 and FIG.
The sampled blended raw materials were also examined for particle size distribution and chemical composition. The results are shown in FIG. Furthermore, the temperature and composition of the exhaust gas in the wind box were also measured in time series. The results are shown in FIGS.

8, 9 and 10 clearly show that there is a relationship between the height of the sintered layer and the product yield, rotational strength, reduced powdering rate, reducibility, particle size distribution and chemical composition. It was found that the raw material charging situation could be simulated.
11 and 12 clearly show how the temperature and composition of the exhaust gas in the wind box change in time series, and it has been found that sintering can be simulated.

  From the above results, it was found that the method of the present invention, which combines the raw material processing part of the DL type sintering machine and the fixed sintering method of the sintering pot, can easily evaluate the sintering operation and quality with a small amount of raw material.

<Example 2>
Test evaluation was performed under the same conditions as in Example 1 except that the sintering raw material 8 was charged in two stages.
First, as shown in Table 2, raw materials having different blending amounts were prepared in the upper and lower stages.

Next, the blend raw material for the lower stage was granulated with the drum mixer 6 and prepared in the surge hopper 10.
Next, the four connected pallet truck groups 12 laid with flooring are moved to the standby section 43A and driven forward at a speed of 2.0 m / min through the charging chute 11 so that the layer height is 350 mm. The raw material was charged. After the charging, the pallet carriage group 12 was moved again to the standby unit 43A.

Next, the blended raw material for the upper stage was granulated with the drum mixer 6 and prepared in the surge hopper 10. Next, after moving the four connected pallet truck group 12 loaded with the lower raw material to the end, it is driven forward at a speed of 2.0 m / min, and the charging chute is 600 mm high. 11 was ignited by passing through an igniting furnace 13 while being charged with the raw material. After the pallet carriage group 12 passed through the ignition furnace 13, the pallet carriage group 12 was moved to the sintering part 43D, stopped, and sintered.
The test results of Example 2 are shown in Table 3 in comparison with the results of the one-stage charging of Example 1.

  As shown in Table 3, in the actual apparatus, even in the test of the two-stage charging / sintering method performed using two sets of raw material charging lines, the sintering apparatus 100 uses the pallet on one set of raw material charging lines. By reciprocating the carriage group 12, the two-stage charging and sintering test operation could be evaluated.

<Example 3>
Sintering test using the raw materials shown in Table 1 and using a sintering pot apparatus, the present apparatus (sintering apparatus 100 of Example 1), and an actual sintering machine (continuous DL type sintering machine) as test apparatuses. The product yield and the sintering production rate were compared. The results are shown in Table 4.

As apparent from Table 4, the product yield and the sintering production rate measured by this apparatus were comparable to the results of the actual sintering machine rather than the sintering pot.
Therefore, it was found that the test accuracy of this device was higher than that of the pot sintering test and comparable to the actual machine.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to embodiment. It is natural for a person skilled in the art to come up with various modifications and improvements within the scope of the technical idea of the present invention, and these are also included in the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Iron ore storage part, 2 ... Limestone storage part, 3 ... Coke storage part, 9 ... Belt conveyor, 10 ... Surge hopper, 11 ... Charge chute, 12 ... Pallet truck group, 12A, 12B, 12C ... Pallet truck, DESCRIPTION OF SYMBOLS 13 ... Ignition furnace, 15 ... Blower, 16-1, 16-2, 16-3, 16-4, 16-5 ... On-off valve, 17-1, 17-2, 17-3, 17-4, 17- 5 ... Branch pipe, 21 ... Electric drive vehicle, 31 ... Main pipe, 32 ... Air leak cover, 33A, 33B ... Dead plate, 34 ... Duct, 34A, 34B ... Spring, 40, 40-1, 40-2, 40-3 40-4, 40-5 ... wind box, 43 ... rail, 43A ... standby part, 43B ... raw material charging part, 43C ... ignition part, 43D ... sintering part, 55 ... end part, 57 ... end part, 60 ... Raw material charging device, 100 ... Sintering device, 200 ... Control section.

Claims (9)

A rail in which a standby part, a raw material charging part, an ignition part, and a sintering part are linearly arranged,
A pallet truck provided so as to be able to travel on the rail;
A drive device for running the pallet truck;
A raw material charging device that is provided above the raw material charging portion and charges the pallet truck with a sintered raw material;
An ignition furnace provided above the ignition unit and igniting an upper layer of the sintered raw material charged in the pallet carriage;
A wind box provided below the rail of the ignition part and the sintering part, and sucking air in the pallet truck from below the pallet truck;
An air leakage lid provided before and after the traveling direction of the pallet carriage,
A dead plate that movably contacts the air leakage lid and prevents air leakage from entering the air box;
A sintering apparatus comprising: The sintering apparatus according to claim 1, wherein
Three or more pallet trucks are connected to form a pallet truck group,
The wind box is provided below the ignition unit, and a first wind box having a length corresponding to a length in a traveling direction of one pallet truck other than an end part constituting the pallet truck group;
A second wind box provided in the sintered portion and having a length in the running direction having a length in the running direction of the pallet truck group;
A sintering apparatus characterized by comprising: The sintering apparatus according to claim 2, wherein
A charging control means for controlling the driving device and the raw material charging device so as to charge the sintered raw material into the pallet cart group while moving the pallet cart group;
The drive device, the ignition furnace, and the first so as to move the pallet carriage group onto the ignition unit, apply a negative pressure to the first wind box, and ignite the sintered raw material Ignition control means for controlling the wind box,
The pallet carriage group is moved to the sintering portion in a state where the sintering raw material is ignited, the application of the negative pressure by the first wind box is stopped, and the negative pressure is applied to the second wind box. Suction control means for controlling the driving device and the wind box;
A sintering apparatus comprising: a control unit having: In the sintering apparatus of Claim 2 or Claim 3,
The pallet cart other than the end portion does not have a partition wall at an end portion adjacent to the pallet cart located at the end portion. In the sintering apparatus as described in any one of Claim 1- Claim 4,
A sintering apparatus comprising biasing means for biasing the dead plate upward. In the sintering apparatus as described in any one of Claim 1- Claim 5,
The sintering apparatus according to claim 1, wherein the driving device is a device for reciprocating the pallet carriage. In the sintering apparatus as described in any one of Claim 1- Claim 6,
The raw material charging device is:
A raw material surge tank for storing the sintered raw material;
A raw material cutting device for cutting out the sintered raw material stored in the raw material surge tank;
A sintering apparatus, comprising: a chute that serves as a guide when the sintered raw material cut out from the raw material cutting apparatus is put into the pallet carriage. In the sintering apparatus as described in any one of Claim 1- Claim 7,
One main pipe, a plurality of branch pipes connecting the main pipe and the wind box,
A blower connected to the main and for applying a negative pressure to the wind box;
An on-off valve for opening and closing the branch pipe;
A sintering apparatus characterized by comprising: A pallet truck provided on a rail in which a standby part, a raw material charging part, an ignition part, and a sintering part are linearly arranged is sintered to the pallet truck while being moved from the standby part to the raw material charging part. A charging process for charging raw materials;
Ignition step of igniting the upper layer of the sintered raw material charged in the pallet cart while moving the pallet cart from the raw material charging unit to the ignition unit;
The pallet carriage is moved from the ignition part to the sintering part and stopped at the sintering part, and a sintering process for sintering the sintering raw material while applying a negative pressure from under the pallet carriage,
The sintering method characterized by implementing.

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