JP2011174136A - Method for supplying raw material to sintering machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for supplying a raw material to a sintering machine, which can easily increase a speed of slicing the raw material from the supply port of a feed hopper without causing clogging of the raw material and can promote the segregation of the raw material to be piled on a pallet of the sintering machine, even in the sintered ore production facility in which the supply amount of the raw material for producing the sintered ore is relatively small. <P>SOLUTION: This supplying method includes: controlling the amount of the raw material 1 for producing the sintered ore, which is supplied from a supply port 2a of a feed hopper 2 onto a bed 4 of the sintering machine 3 through a sloping chute 5, to 100 ton/hr or less; and constantly equalizing the amount of the raw material 1 to be supplied into the feed hopper 2 with the amount of the raw material 1 to be supplied from the supply port 2a of the feed hopper 2 onto the bed 4 of the sintering machine 3 through the sloping chute 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a raw material supply method to a sintering machine that supplies a raw material for manufacturing a sintered ore onto a bed of a sintering machine via a feed hopper. For example, the present invention relates to a small-scale production capacity of about 400 ton / day. The present invention relates to a raw material supply method to a sintering machine suitable for implementation in a sintered ore production facility of an alloy sintering factory.

  Conventionally, a large amount of sintered ore of 500 ton / hr or more has been manufactured at a sinter ore manufacturing facility of a steel mill equipped with a large-scale blast furnace facility, and a raw material for manufacturing a sinter ore is baked through a feed hopper. The work was carried out by supplying it onto the bed of the machine. The supply method of the sinter production raw material is to supply the sinter production raw material into the feed hopper, deposit a certain amount, adjust the gate opening of the feed hopper supply port, and sinter It has been common practice to feed the raw material for ore production onto the bed of the sintering machine via a sloping chute.

  The sinter production raw material to be deposited on the bed of the sintering machine promotes so-called segregation, in which particles with smaller particle size are deposited on the upper layer side, and conversely, particles with larger particle size are deposited on the lower layer side. If it can be made, the air permeability of the sinter production raw material on the bed of a sintering machine will improve, and productivity will improve.

  FIG. 3 shows a method of supplying the raw material 1 for sinter ore production to the sintering machine 3 conventionally employed in the sinter ore production facility of an ironworks equipped with a large-scale blast furnace facility. In this conventional sinter production facility, the sinter production raw material 1 is supplied onto the sloping chute 5 from the supply port 2a by adjusting the gate opening after a certain amount is deposited on the feed hopper 2. Then, it flows down on the inclined sloping chute 5 and is supplied onto the pallet (bed) 4 of the sintering machine 3. As effective means for promoting the above, there are the following four means.

  The first means is to reduce the capacity of the sinter production raw material 1 supplied from the feed hopper 2, and the second means is the initial speed of the sinter production raw material 1 that flows down on the inclined sloping chute 5. (Cutout speed) is increased. The third means is to increase the length of the sloping chute 5 and the last fourth means is to loosen the inclination of the sloping chute 5.

  In a large-scale sinter production facility corresponding to a conventional blast furnace, segregation of the sinter production raw material 1 could be promoted by appropriately adopting these means, but sintering used in an electric furnace or the like. In the production facility for alloy sinter with a relatively small supply amount of ore production raw material, particularly for the production facility for small-scale alloy sinter with a supply amount of sinter production raw material of 100 ton / hr or less, the supply hopper 2 The capacity of the sinter production raw material 1 supplied onto the pallet 4 via the sloping chute 5 is significantly smaller than that of a large-scale sinter production facility corresponding to a conventional blast furnace, and these are shown above. There was a situation that it was not possible to cope with the problem even if the measures were taken, and it was not easy to promote the segregation of the raw material 1 for manufacturing the sintered ore.

  The actual supply of raw materials for producing sinter ore was confirmed with a small-scale alloy sinter production facility with an amount of 100 ton / hr or less. In the ore production facility, the speed of the sinter production raw material 1 that flows down on the sloping chute 5 is slowed down, so that among the sinter production raw materials 1 deposited on the pallet 4, coarse sinter production It was confirmed that the raw material 1 was deposited at a higher rate on the upper layer side than a large-scale sinter production facility, and this caused the segregation of the sinter production raw material 1 to not be promoted well. .

  In order to solve this problem, the speed of the sinter ore production raw material 1 flowing down on the sloping chute 5 is increased in a small sinter ore production facility with a supply amount of sinter ore production raw material of 100 ton / hr or less. Therefore, the gate opening degree of the supply port 2a of the feed hopper 2 is narrowed, and the cutting speed of the feed hopper 2 from the supply port 2a is tried to be increased by reducing the cut-out thickness of the sintered ore production raw material 1. However, since the supply port 2a of the feed hopper 2 was too narrow, it was confirmed that clogging of the sintered ore production raw material 1 occurred and it was not possible to cope with it well.

  Various techniques have already been proposed as a method for adjusting the supply amount of raw materials including sinter ore production materials in a large-scale sinter production facility corresponding to a conventional blast furnace. A typical prior art will be described below.

  As Patent Document 1, the charging process of the sinter raw material charged into the pallet of the sintering machine from the surge hopper is photographed with a high-speed TV camera, and the particle size distribution of the sinter raw material in the pallet is determined. Based on the obtained particle size distribution, the raw material charging control elements such as the angle of the sloping chute below the surge hopper are changed to adjust the particle size distribution of the sinter raw material in the pallet and sinter the sinter raw material. A method of performing control has been proposed.

  Further, as Patent Document 2, a filling hopper is installed on a sintering pallet, and the lower end on the pallet entry side of the filling hopper is located near the grate, and the lower end on the pallet exit side is located on the surface of the sintered layer. In addition, a method has been proposed in which a raw material is supplied into a filling hopper to form a packed bed, and the filled raw material is continuously moved down according to the movement of the sintering pallet.

  Further, as Patent Document 3, the air permeability of the raw material layer in the pallet is measured, and based on the measurement result, at least one of the rotation speed of the roll feeder, the height of the roll feeder including the hopper, and the inclination angle of the sloping chute A method of controlling one has been proposed.

  However, these proposals are all related to the technology corresponding to the large-scale sinter production facility corresponding to the conventional blast furnace, and the supply amount of the sinter production raw material used for the electric furnace or the like is relatively In the production facilities of few alloy sinters, it is not possible to adopt these prior arts as they are, and even if they can be adopted, as mentioned above, clogging of sinter ore production materials at the feed hopper supply port It is very likely that problems such as the occurrence of sinter will occur, and many of these conventional proposals should be adopted in sinter ore production facilities where the supply of sinter ore raw materials is relatively small. I could not.

JP-A-60-211021 Japanese Patent Laid-Open No. 61-195928 JP-A-3-191030

  The present invention has been made in view of the above-described conventional situation, and even if the sinter production equipment has a relatively small supply amount of the sinter production raw material, the sinter production from the supply port of the feed hopper Increasing the cutting speed of the raw material can be easily performed without clogging of the raw material for manufacturing the sintered ore, and can promote the segregation of the raw material for manufacturing the sintered ore to be deposited on the pallet of the sintering machine. It is an object of the present invention to provide a raw material supply method to a kneading machine.

  The raw material supply method to the sintering machine of the present invention is characterized in that the raw material supply method to the sintering machine supplies the sintered ore production raw material onto the bed of the sintering machine through a sloping chute inclined from the feed hopper. In the sintering, the feeding hopper is supplied onto the bed of the sintering machine through the slowing chute from a supply port formed between roll feeders provided so as to cover the lower surface of the feeding hopper. The supply amount of the ore production raw material is set to 100 ton / hr or less, the supply amount of the sintered ore production raw material into the feed hopper, and the firing chute from the supply port of the feed hopper through the sloping chute. The supply amount of the sinter production raw material supplied onto the bed of the sintering machine is always the same, and the sinter production raw material is deposited on the bed of the sintering machine without being deposited in the feed hopper. It is to feed.

  According to the raw material supply method to the sintering machine of the present invention, even if the supply amount of the sinter production raw material is 100 ton / hr or less and the sinter production facility is relatively small, the sinter is supplied from the supply hopper supply port. Increasing the cutting speed of the raw material for producing the ore can be easily carried out without clogging the raw material for producing the sintered ore, and can promote segregation of the raw material for producing the sintered ore to be deposited on the pallet of the sintering machine. it can. As a result, the productivity of sintered ore can be improved. In addition, since the supply of the sintered ore production raw material is performed via the feed hopper, dust does not fly during the supply, and the work environment is not adversely affected.

It is a longitudinal cross-sectional view which shows the outline of the raw material supply method to the sintering machine regarding one Embodiment of this invention. It is the schematic which shows the whole sintered ore manufacturing equipment used for the same embodiment. It is a longitudinal cross-sectional view which shows the outline of the raw material supply method to the sintering machine conventionally employ | adopted with the sintered ore manufacturing equipment of the iron mill provided with the large-scale blast furnace equipment.

  Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings.

  FIG. 1 is a longitudinal sectional view showing an outline of a raw material supply method to a sintering machine according to an embodiment of the present invention, and FIG. 2 is a schematic view showing an entire sintered ore production facility used in the embodiment. It is. 1 and 2, 1 is a raw material for producing sinter used in the present invention, 2 is a feed hopper, 2a is a feed port formed at the lower end of the feed hopper 2, 3 is a sintering machine, A pallet (bed) installed in the sintering machine 3 is a slowing chute for supplying the sinter production raw material 1 from the feeding hopper 2 to the sintering machine 3, and 6 is provided below the feeding hopper 2. Roll feeder.

  In the present invention, the supply amount of the sinter ore production raw material 1 is 100 ton / hr or less, more preferably, the supply amount of the sinter ore production raw material 1 is about 10 to 30 ton / hr. The supply of the raw material 1 for producing the sinter ore is intended.

  Examples of the sinter ore production raw material 1 that can be used in the present invention include manganese ore. The average particle diameter of the sinter ore production raw material 1 is as large as about 10 mm and as small as about 3 mm. It is.

  As shown in FIG. 1, the shape of the feed hopper 2 is a so-called funnel shape whose longitudinal section is narrowed downward, and both the upper and lower sides are open. As shown in FIG. 2, the sinter ore production raw material 1 is supplied from the raw material tank 7 through the drum mixer 8 into the feed hopper 2 from above, but the feed hopper 2 has a funnel shape. There will be no adverse effects on the working environment due to dust flying.

  On the lower side of the feed hopper 2, there is provided a roll feeder that is rotationally driven so as to cover the lower surface of the feed hopper 2, and between the surface of the roll feeder 6 and the lower end of the feed hopper 2. Among the gaps, a gap formed only on the rotation direction side of the roll feeder 6 is the supply port 2a. This supply port 2a has a gap that is as wide as possible without reducing the speed of falling in the feed hopper 2 and can increase the cutting speed of the raw material 1 for sintered ore production. In consideration of scattering from the supply port 2a of the sinter ore production raw material 1, the specific width of the gap, that is, the opening size of the supply port 2a is the average particle diameter of the sinter ore production raw material 1 described above. Of these, it is preferably 10 to 20 times.

  The sintered ore production raw material 1 supplied to the feed hopper 2 slides down in the feed hopper 2 without being deposited in the feed hopper 2, and clogging at the feed port 2a does not occur. The roll feeder 5 falls downward in the rotational direction with a high cutting speed. Sintered ore supplied to the pallet 4 of the sintering machine 3 through the slowing chute 5 from the supply amount 2a of the sinter ore production raw material 1 into the feed hopper 2 and the supply port 2a of the feed hopper 2. The supply amount of the manufacturing raw material 1 needs to be substantially the same amount at all times. When the balance of the supply amount is lost, the sinter ore production raw material 1 is deposited in the feed hopper 2 or the supply of the sinter ore production raw material 1 from the supply port 2a cannot be performed. A problem occurs.

  Further, no gap is formed between the surface of the roll feeder 6 and the lower end of the feed hopper 2 on the side opposite to the supply port 2a, and the surface of the roll feeder 6 and the lower end of the feed hopper 2 are in contact with each other. ing. This means that if there is a gap on the opposite side to the supply port 2a, the roll feeder 6 is rotating, but the roll feeder 6 may drop from the gap on the opposite side to the rotation direction. This is because there is a possibility that the work may be hindered.

  In a conventional large-scale sinter ore manufacturing facility corresponding to a blast furnace, this supply port 2a is provided with a gate or the like for adjusting the supply amount of the sinter ore manufacture raw material 1; Then, since the supply port 2a is not provided with a gate or the like that hinders the supply of such sinter ore production raw material 1, clogging does not occur at the supply port 2a. Can be immediately discharged downward (supplied) from the supply port 2a.

  The sloping chute 5 is provided below the supply port 2 a and below the roll feeder 6. The upper end portion of the sloping chute 5 is separated from the roll feeder 6 to the side thereof, and the lower end portion thereof is separated from the roll feeder 6 and located below the roll feeder 6. The sloping chute 5 is provided in an inclined state.

  The sintered ore production raw material 1 discharged from the supply port 2 a flows down on the slowing chute 5 and is supplied from the lower end of the slowing chute 5 onto the pallet 4 of the sintering machine 3. In order to uniformly charge the sintered ore production raw material 1 in the width direction of the pallet 4, the sloping chute 5 is generally a flat plate.

  The sinter production raw material 1 supplied onto the pallet 4 of the sintering machine 3 travels in the direction opposite to the inclination direction of the sloping chute 5 together with the pallet 4 and passes through an ignition furnace 9 provided in the sintering machine 3. Then, it is fired inside the ignition furnace 9 to become a sintered ore.

  In the raw material supply method to the sintering machine of the present invention, the supply amount of the sinter ore production raw material is 100 ton / hr or less, in particular, the small amount of the supply of the sinter ore production raw material 1 is about 10 to 30 ton / hr. Even in a sinter ore manufacturing facility of a sinter factory, the sinter ore production raw material 1 can be deposited on the upper layer side as the particle size is smaller, and conversely on the lower layer side as the particle size is larger. It can be set as the state which promotes segregation. That is, the air permeability of the sintered ore production raw material 1 deposited on the pallet 4 of the sintering machine 3 is improved, and the productivity of the sintered ore is improved.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, and the present invention is implemented with appropriate modifications within a range that can meet the gist of the present invention. These are all included in the technical scope of the present invention.

In the same way as a large-scale sinter production facility corresponding to the conventional blast furnace shown in FIG. 3, a sinter production facility smaller than the sinter production facility is used. In the method of the present invention as shown in FIG. 1, using a small-scale manufacturing facility for alloy sinter having a production capacity of about 400 ton / day, which is used for manufacturing this alloy sinter. By supplying raw materials for producing sinter ore, a production test was carried out using an actual alloy sinter ore. Incidentally, test results are the average value obtained by converting the production during the test period per day. The test results are shown in Table 1.

  According to this test result, it can be seen that the actual production capacity per day is 121 ton / day, and the productivity improvement rate is about 30%, compared with the conventional method.

DESCRIPTION OF SYMBOLS 1 ... Sinter raw material 2 ... Feeding hopper 2a ... Supply port 3 ... Sintering machine 4 ... Pallet (bed)
5 ... Sloping chute 6 ... Roll feeder 7 ... Raw material tank 8 ... Drum mixer 9 ... Ignition furnace

Claims (1)

In the raw material supply method to the sintering machine for supplying the sintered ore production raw material to the bed of the sintering machine through the sloping chute inclined from the supply hopper,
The sintered ore to be fed onto the bed of the sintering machine through the sloping chute from a supply port formed between the feed hopper and a roll feeder provided so as to cover the lower surface of the feed hopper The supply amount of the manufacturing raw material is set to 100 ton / hr or less,
Supply amount of the sinter production raw material into the feed hopper and supply of the sinter production raw material supplied from the supply hopper supply port onto the bed of the sintering machine via the slowing chute A method for supplying a raw material to a sintering machine, wherein the amount is always the same, and the raw material for producing the sintered ore is supplied onto the bed of the sintering machine without being deposited in the feed hopper.