JP2018172760A - Manufacturing method of sintered ore and manufacturing device of sintered ore - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of sintered ore and a manufacturing device of sintered ore, which can sufficiently achieve NOinhibition effect on a carbonaceous material granulated article even when granulation strength of the carbonaceous granulated article is insufficient.SOLUTION: There is provided a manufacturing method of sintered ore by conducting; a granulation process of a raw material for sintering (S1) for granulating the raw material for sintering containing at least an iron source to obtain a granulated article for sintering; a carbonaceous granulation process (S2) for granulating a carbonaceous granulated article containing an undersize carbon material obtained by using a sieve with screening classification point of 0.5 mm or more and 1 mm or less and an undersize coal source obtained by using a sieve with screening classification point of 0.5 mm or more and 1 mm or less; and injection processes (S3, S4) for mixing the carbonaceous granulated article and the granulated article for sintering on an injection chute and injecting them onto a pallet by directly inputting the carbonaceous granulated article to the injection chute and injecting the granulated article for sintering from a surge tank to the injection chute at the same time.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for producing sintered ore and an apparatus for producing sintered ore.

Sintered ore for blast furnace raw materials is manufactured by sintering auxiliary materials such as ores and scales (hereinafter referred to collectively as ores and miscellaneous materials as iron sources), carbonaceous materials and limestone. Specifically, it is manufactured by the following procedure.
First, the ore, the auxiliary material, the carbon material, and the return mineral are granulated with water using a granulator to obtain a blended raw material for sintering.

  Next, the blended raw material is charged onto a pallet of a sintering machine to form a packed bed, and the upper surface of the packed bed is ignited with a burner. By ignition, the carbonaceous material in the packed bed burns to form a combustion zone. Further, air in the pallet is sucked from below the pallet. The combustion zone proceeds from the upper layer to the lower layer of the packed bed by suction. In the combustion zone, the surrounding granulated material (also called pseudo particles) is heated and partially melted by the heat of combustion, and the granulated material is cross-linked and sintered by the melt. Manufactured. The produced sintered ore is discharged from the pallet, crushed by a crusher, and sized with a sieve. The sieve top becomes sintered ore, and the sieve bottom is returned to the sintered raw material as return ore.

Such a method for producing a sintered ore is inexpensive, and can agglomerate a granular sintered raw material in a large amount and easily. On the other hand, this manufacturing method releases exhaust gas containing nitrogen oxides (NO _x ) because the carbonaceous material burns during sintering. Therefore, it is necessary to suppress the generation of NO _x.

Patent Documents 1 and 2, in order to suppress the NO _x generation during sintered ore production, which is a kind of carbonaceous material granules were mixed and granulated by adding lime source carbonaceous material LCC (Lime Coating Coke) Techniques for using are described.
In Patent Documents 1 and 2, the carbon material, CaO, and FeO _x are in a single granulated product, and NO _x generated during combustion of the carbon material is decomposed by CaO · Fe ₂ O ₃ generated by combustion. Then it is described.
In Patent Documents 1 and 2, in order to prevent the lime coating from peeling from the LCC and to uniformly mix the raw material and the carbonaceous material, the raw material other than the LCC is granulated, and then LCC is added and mixed and granulated. The post-addition is preferable.
As described above, in the production of sintered ore, there is a case where a method of preventing a part of the granulated material from peeling or collapsing and mixing the raw materials uniformly may be required.

  Although Patent Document 3 is not a technique using LCC, it flows down to the charging chute separately from the raw material particles produced by a conventional method in order to prevent the coke exterior vibration granulation pellet from collapsing on the pallet of the sintering machine. The technology to be described is described.

  Patent Document 4 is not a technique that uses LCC, but in order to prevent the formation of an embrittlement layer in the upper layer of the raw material packed layer, when charging the sintered raw material from the charging chute onto the moving pallet, A technique for newly adding solid fuel on the incoming chute is described.

  Patent Document 5 is not a technique using LCC, but describes a technique in which a sintering auxiliary fuel is charged on a pallet separately from a sintering raw material.

  Patent Document 6 is not a technique using LCC, but a plurality of powders distributed in the longitudinal direction provided on the side surface of the cylindrical body by extruding the powder in the longitudinal direction of the cylindrical body extending over the width direction of the sintered pallet. A technique for cutting out a charging chute from a cutting hole is described.

International Publication No. 2011/129388 Japanese Patent Laid-Open No. 2006-104901 JP 05-148557 A JP 2000-256757 A Japanese Patent No. 2982128 JP 2000-096158 A

The techniques described in Patent Documents 1 to 6 are useful in that when a part of the granulated material is coated, peeling and collapse can be prevented and the raw materials can be mixed uniformly. In particular, the techniques described in Patent Documents 1 and 2 are useful in that NO _x generation during the production of sintered ore can be suppressed.
However, if the granulation strength of the carbonaceous material granules is insufficient, there is a case where NO _x suppression of carbonaceous material granules even using these techniques is not sufficiently exhibited.

The present invention provides a method for producing a sintered ore and an apparatus for producing a sintered ore that can sufficiently exhibit the NO _x suppression effect of the carbonaceous granulated product even when the granulated strength of the carbonaceous granulated product is insufficient. The purpose is to provide.

The method for producing sintered ore according to the present invention comprises a sintering raw material granulation step in which a sintering raw material containing at least an iron source is granulated to obtain a sintered granulated product, and a sieving classification point of 0 Carbonaceous material granulation containing sieving carbon material obtained by using sieve of 5 mm or more and 1 mm or less and lime source of sieving obtained by using sieve having classification point of 0.5 mm or more and 1 mm or less A carbonaceous material granulating step for granulating the product, and directly charging the carbonized material granulated product into the charging chute, and simultaneously charging the granulated material for sintering from the surge tank to the charging chute, And a charging step of mixing the carbon material granulated material and the granulated material for sintering on the charging chute and charging the mixture onto the pallet.
According to the present invention, a carbonaceous granulated product containing P-type having insufficient granulation strength is directly charged into a charging chute separately from other sintering raw materials. Therefore, the opportunity for the carbonaceous granule to come into contact with other granulated materials between granulation and charging to the pallet can be reduced as much as possible, and the collapse of the carbonaceous granulated material due to contact can be prevented. Can do.
Accordingly, even if granulation strength of the carbonaceous material granules is insufficient, it can sufficiently exhibit NO _x suppression of carbonaceous material granules.

In the present invention, the carbonaceous material granulation step is performed by classifying a carbonaceous material in advance with a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less, a sieving under the classification process, and a sieving classification point. Performing the first carbon material granulation step of producing the first carbon material granulated product by granulating the lime source under the sieve obtained using a sieve of 0.5 mm or more and 1 mm or less. preferable.
According to this invention, a P-type carbon material granulated material (1st carbon material granulated material) is granulated at a carbon material granulation process. Therefore, it is possible to reduce as much as possible the chance that a P-type carbonaceous granulated product with insufficient granulation strength comes into contact with other granulated products, and to prevent collapse of the carbonaceous granulated product due to contact.

In the present invention, the second carbon material granulated product obtained by granulating the sieve in the classification step and the lime source under the sieve obtained by using a sieve having a classification point of 0.5 mm or more and 1 mm or less. The second carbonaceous material granulation step to be manufactured and the addition step of adding the second carbonaceous material granulated product before introducing the granulated material for sintering into the surge tank are performed. preferable.
According to the present invention, the C-type (second carbon material granule), which is a relatively high strength carbon material granule, is used for the sieving of the carbon material during the production of the P-type carbon material granule. And then added to the granulated material for sintering before the surge tank. For this reason, the amount of the granulated carbonaceous material directly charged into the charging chute can be reduced to only the P type, and the charging equipment for the charging chute can be simplified.

In the present invention, the carbon material granule may include the raw material for sintering.
According to this invention, if it is a raw material containing a P-type carbon material granulated material, it will be directly injected into the charging chute regardless of the composition. Therefore, the opportunity for the P-type carbon material granulated product to come into contact with another granulated product between granulation and charging into the pallet can be reduced as much as possible, and collapse due to contact can be prevented.

  The apparatus for producing a sintered ore according to the present invention stores a granulation part for producing a granulated product for sintering by granulating a raw material for sintering containing at least an iron source, and the granulated product for sintering. Surge tank, carbon material under sieving obtained using a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less, and a sieve obtained using a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less A carbon material granulation part for granulating a carbon material granule containing the lower lime source, the granulation for sintering, a pallet into which the carbon material granulation is charged, and the sintering A charging chute that serves as a guide for charging the granular material and the carbonaceous granulated material into the pallet; a carbonaceous material charging unit that directly inputs the carbonaceous granulated material into the charging chute; Sintered granule input part for charging the granulated product into a charging chute from a surge tank, and the sintered granulated material charged in the pallet An ignition furnace for sintering the preliminary the carbonaceous material granules, characterized in that it comprises a.

  According to the present invention, a granulated material containing a P-type carbon material granulated material having insufficient granulation strength is directly charged into a charging chute separately from other sintering raw materials. Therefore, it is possible to reduce the chance that the carbonaceous granulated product comes into contact with other granulated products between granulation and charging to the pallet as much as possible, and prevent collapse of the carbonaceous granulated product due to contact. .

The schematic diagram which shows the sintering apparatus which concerns on the 1st Embodiment of this invention. The figure of the surge tank vicinity of FIG. The flowchart which shows the procedure of the sintering method which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the sintering apparatus which concerns on the 2nd Embodiment of this invention, Comprising: The figure of surge tank vicinity. The flowchart which shows the procedure of the sintering method which concerns on the 2nd Embodiment of this invention. The schematic diagram which shows the sintering test apparatus used in the Example.

<Background of the invention>
First, the background of the present invention will be described.
As described in Patent Documents 1 and 2, in order to suppress the NO _x generation during sintered ore production, the addition of lime source carbonaceous material mixed and granulated technique as carbonaceous material granules in a known is there.
On the other hand, the inventor has found that the carbonaceous granulated product has different structures of P-type and C-type depending on the raw material carbonaceous material and the particle size of the lime source.
The present inventor has also found that the P-type carbonaceous material granule has a lower granulation strength than the C-type carbonaceous material granulated product, and tends to collapse. This is because the C-type carbonaceous material granule has a structure in which the core particles are covered with fine powder, whereas the P-type carbonaceous material granulated structure has no core particles and is granulated only with the fine powder. It was thought that there was.

Therefore, by reducing as much as possible the chance that the carbonaceous granulated product including the P-type carbonaceous granulated product comes into contact with other granulated products, collapse due to contact can be prevented, and NO during sinter production _The present inventor thought that _x generation could be suppressed.

Therefore, the present inventor directly put the carbonaceous material granule including the P-type carbonaceous material granule into the charging chute as a test when the sintered ore was manufactured. As a result, it has been found that the P-type carbonaceous material granule can be prevented from collapsing and the generation of NO _x during the production of sintered ore can be suppressed, and the present invention has been achieved.
The above is the background of the present invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
Initially, with reference to FIG. 1 and FIG. 2, schematic structure of the sintered ore manufacturing apparatus which concerns on 1st Embodiment is demonstrated.

A sintered ore manufacturing apparatus 100 shown in FIG. 1 and FIG. 2 is a DL (Dwightroid) type sintering apparatus that performs sintering of iron ore as an iron source.
As shown in FIG. 1, the sinter production apparatus 100 includes a pallet carriage group 12, a raw material blending apparatus 50, a raw material charging apparatus 60, a carbonaceous granulation unit 70, an ignition furnace 13, a wind box group 14, a blower 15, A crusher 18, a cooler 19, and a sieve 20 are provided.

  The pallet carriage group 12 is a combination of trolleys provided with wheels on a pallet into which the granulated material for sintering 8 (granulated material of the compounding material for sintering) is charged. The pallet carriage group 12 is connected continuously and is continuously driven using a driving device (not shown).

The raw material blending device 50 is a part for blending and granulating the granulated material 8 for sintering.
The raw material blending device 50 includes a storage tank group 1 composed of a plurality of storage tanks provided for each raw material brand, a collective conveyor 4, a drum mixer 6, a water supply nozzle 7, and a belt conveyor 9.

  The storage tank is an apparatus for storing respective sintered raw materials such as iron ore, miscellaneous raw materials, auxiliary raw materials, carbonaceous materials, and returning ores.

  The raw material stored in each storage tank is discharged onto the collective conveyor 4 at a constant flow rate by a quantitative cutout device (not shown) provided at the lower end thereof. Thereby, at the downstream end of the collective conveyor 4, a raw material (pre-granulation mixed raw material) in which the respective raw materials are mixed at a predetermined ratio is formed.

  The drum mixer 6 granulates the raw material before granulation with water. 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. In order to enhance the granulation effect, quick lime or the like may be used as a part of the auxiliary raw material as a binder.

  The belt conveyor 9 is a conveyor that conveys the granulated material 8 for sintering from the drum mixer 6 to the raw material charging device 60.

The raw material charging device 60 is a device for charging the granulated material 8 for sintering into the pallet carriage group 12.
As shown in FIGS. 1 and 2, the raw material charging device 60 includes a surge tank 10, a roll feeder 10 </ b> A, and a charging chute 11.
The surge tank 10 is a hopper that stores the granulated material 8 for sintering immediately before charging into the pallet carriage group 12.
The roll feeder 10 </ b> A is a raw material cutting device that cuts out the granulated material 8 for sintering from the surge tank 10, and is a rotary feeder (sintered granule charging unit) here.

  The charging chute 11 is an inclined plate-shaped guide for charging the granulated material 8 for sintering into a predetermined position of the pallet carriage group 12.

As shown in FIG. 1 and FIG. 2, the carbon material granulation unit 70 includes a carbon material storage unit 31, a limestone storage unit 39, a carbon material granulation mixer 35, and a carbon material granule supply device 6A.
The carbon material storage part 31 and the limestone storage part 39 are apparatuses for storing carbon material and limestone, which are raw materials of the carbon material granulated product, respectively.
The carbon material granulation mixer 35 is a device for mixing the carbon material and limestone to granulate the carbon material granulated product 8A.

  The carbon material granule supply device 6A (carbon material input unit) is a portion for charging the carbon material granule 8A into the pallet truck group 12. It is preferable that the carbonaceous granule supply device 6A has a structure in which the carbonaceous granule 8A does not easily collapse. As such a structure, the slip stick conveyor of patent document 5 is mentioned. The carbonaceous granule supply device 6A is provided above the charging chute 11 and above the roll feeder 10A.

The ignition furnace 13 is a furnace that ignites the surface layer of the raw material charged in the pallet carriage group 12. The ignition furnace 13 is a furnace for burning gas fuel at a high temperature, for example.
The wind box group 14 is a member that obtains a sintered cake 17 by sucking the air in the pallet truck group 12 from below the pallet truck group 12 to sinter the charged raw material from the upper layer toward the lower layer. .

  In the wind box group 14, for example, a plurality of boxes whose upper and lower ends are opened are arranged below the pallet truck group 12 along the moving direction of the pallet truck group 12. The wind box group 14 is connected to the blower 15.

The blower 15 is a device that sucks the inside of the wind box group 14 and is connected to the wind box group 14.
The crusher 18 coarsely pulverizes the sintered cake 17.
The cooler 19 is a device for cooling the coarsely pulverized sintered cake 17.
The sieve 20 classifies the coarsely pulverized sintered cake 17 and sends the sieve cake as a sintered ore to a blast furnace. The sieving material is used as a raw material again as a return ore.
The above is description of schematic structure of the sintered ore manufacturing apparatus 100 which concerns on 1st Embodiment.

  Next, the sintered ore manufacturing method using the sintered ore manufacturing apparatus 100 which concerns on 1st Embodiment is demonstrated with reference to FIGS.

First, the sintering raw material is classified based on the composition (S0 in FIG. 3).
The raw materials other than S2 described below among the sintered raw materials are granulated using the raw material blending apparatus 50 to obtain a granulated product 8 for sintering (S1 in FIG. 3, raw material granulating step for sintering). If the value of NO _{x in} the exhaust gas is within the target value range, carbonaceous materials may be included.

  When the sintered material is a carbon material, the carbon material granulated portion 70 is used to granulate the carbon material granulated product 8A from the carbon material and the lime source (S2, carbon material granulation step in FIG. 3).

  In the first embodiment, in S2, a carbonaceous material granulated product 8A including a P-type is manufactured as the carbonaceous material granulated product 8A. Specifically, the carbonaceous material granule described in Patent Documents 1 and 2 can be exemplified.

Here, the structure of the carbonaceous material granule 8A will be described in more detail.
The carbonaceous material for sintering is usually powder coke pulverized to an average particle size of 3 mm or less. The lime source for sintering is limestone or slaked lime (including digested lime), and the former is pulverized to an average particle size of 3 mm or less. The latter has an average particle size of 1 mm or less.

The particles of the sintering raw material behave as any of adhering powder, intermediate particles, and core particles after the granulation treatment. Usually, the boundary particle size between adhering powder and intermediate particles is 0.25 mm to 0.5 mm, and the boundary particle size between intermediate particles and core particles is 1 mm to 2 mm. However, a P-type granulated product composed only of adhered powder can take a certain amount of intermediate particles and become a granulated product. Therefore, when the upper limit diameter of the raw material particles when producing the P-type granulated product is called the P-type upper limit particle size, the P-type upper limit particle size has a width on the upper side of 0.5 mm or more and 1 mm or less.
Carbon material granulated products obtained by granulating powder coke (3 mm or less) and slaked lime (1 mm or less) include the following three types.
(1) A carbon material granulated product having a C-type structure using a carbon material as a core and a mixture of slaked lime and carbon material as an attached powder.
(2) A P-type structured carbonaceous material granule comprising a mixture of a carbonaceous material having a particle size equal to or smaller than the P-type upper limit particle size and slaked lime.
(3) Carbonaceous single particles.

Carbonaceous granulated products obtained by granulating powder coke (3 mm or less) and limestone (3 mm or less) are the following four types.
(A) A carbon material granulated product having a C-type structure in which a carbon material is used as a core and a mixture of carbon material and limestone is used as an adhering powder.
(B) A limestone granule having a C-type structure using a mixture of a carbonaceous material and lime as an adhering powder with limestone as a core.
(C) A carbonaceous material granule having a P-type structure composed of a mixture of carbonaceous material having a particle size equal to or smaller than the P-type upper limit particle size and limestone.
(D) Single particles of powder coke or limestone.

When these carbonaceous material granules are put together, the P-type structure carbonaceous material granule is a P-type upper limit particle size, that is, a sieve obtained by using a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less. A carbonaceous granulate containing the lower carbonaceous material and a similar lime source.
C-structured carbon material granulated material is a carbon material on a sieve obtained by using a sieve having a sieving classification point of 1 mm or more and 2 mm or less, and a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less. It is a carbonaceous material granulated product containing an undersieved carbonaceous material and a lime source. Or the lime source on the sieve obtained by using a sieve having a sieving classification point of 1 mm or more and 2 mm or less, and the carbon material under the sieve obtained by using a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less. And a granulated carbonaceous material containing a lime source.

The carbon material granule 8A does not necessarily need to be only the carbon material and the lime source. Sintering raw materials other than the carbonaceous material and the lime source may be included within a range in which the NO _x reduction action is not eliminated.

Next, the carbonaceous granulated product 8A is directly charged into the charging chute 11 using the carbonaceous granulated product supply device 6A (S3 in FIG. 3, charging step).
At the same time, the granulated material 8 for sintering is cut out from the surge tank 10 by the roll feeder 10A and charged into the charging chute 11 (S4 in FIG. 3, charging step).

Thus, by charging directly carbonaceous material granules 8A including P-type structure from the top charging chute 11, the collapse of the carbonaceous material granules 8A is prevented, NO _x reduction effect is sufficiently exhibited .
Furthermore, since S3 and S4 are performed simultaneously, the granulated material 8 for sintering and the granulated material 8A for charcoal are mixed on the charging chute 11 and charged into the pallet truck group 12. Since the ratio of the carbon material granulated product 8A is a small amount of about 3 to 5% by mass with respect to the sintered granulated product 8, the granulated product 8 for sintering is sufficiently obtained on the charging chute 11. Can be mixed with.
The above is description of the sintered ore manufacturing method using the sintered ore manufacturing apparatus 100 which concerns on 1st Embodiment.

  As described above, according to the first embodiment, the granulated material including the P-type carbon material granulated material having insufficient granulation strength is put into the charging chute 11 separately from the other raw materials for sintering. Direct input. Therefore, the opportunity for the carbonaceous granulated product 8A to come into contact with another granulated product between granulation and charging to the pallet can be reduced as much as possible, and collapse due to contact can be prevented.

Next, a second embodiment will be described with reference to FIG. 4 and FIG.
In the first embodiment, the C-type and P-type carbonaceous material granulated materials are separately granulated in the first embodiment and put in different places. In the second embodiment, elements having the same functions as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

First, the schematic configuration of the sintered ore manufacturing apparatus according to the second embodiment will be described with reference to FIG.
As shown in FIG. 4, the sintered ore manufacturing apparatus 100A further includes a sieve 33, a C-type carbon material granulation mixer 37, and a C-type carbon material supply unit 6B.

The sieve 33 is a sieve that classifies the carbon material supplied from the carbon material storage unit 31.
The C-type carbon material granulation mixer 37 granulates the carbon material on the sieve of the sieve 33 and the lime source supplied from the limestone storage unit 39 to obtain a C-type carbon material granulated product 8C (second carbon material). It is an apparatus for granulating a granulated product.
The C-type carbon material supply unit 6B is a conveyor that inputs the C-type carbon material granule 8C to the belt conveyor 9, and is preferably a slip stick conveyor.

In the second embodiment, the carbon material granulation mixer 35 granulates the carbon material under the sieve 33 and the lime source supplied from the limestone storage unit 39 to obtain a P-type carbon material granulated product 8B ( The first carbon material granulated product) is granulated.
The above is the description of the schematic configuration of the sintered ore manufacturing apparatus 100A according to the second embodiment.

  Next, a sintered ore manufacturing method using the sintered ore manufacturing apparatus 100A according to the second embodiment will be described with reference to FIG. 4 and FIG.

First, the sintering raw material is classified based on the composition (S11 in FIG. 5).
When the sintering raw material is other than the carbonaceous material, the sintering raw material is granulated using the raw material blending device 50 to obtain a granulated product 8 for sintering (S12 in FIG. 5).

When the sintered material is a carbon material, the carbon material is supplied from the carbon material storage unit 31 to the sieve 33 and classified (S13 in FIG. 5, classification step). The sieving classification point is 0.5 mm or more and 1 mm or less.
Next, the carbon material under the sieve 33 and the lime source are granulated to granulate a P-type carbon material granulated product 8B (S14 in FIG. 5, first carbon material granulating step).

Next, the carbonaceous material and the lime source on the sieve 33 are granulated to granulate a C-shaped carbonaceous granulated product 8C (S15 in FIG. 5, second carbonaceous material granulating step). The upper limit particle size of the lime source is preferably sieving obtained by using a sieve of 0.5 mm or more and 1 mm or less in order to efficiently cover the core carbonaceous material. Most preferred is 25 mm or less.
The C-type carbon material granule 8C is added to the granulation material 8 for sintering in front of the surge tank 10 via the belt conveyor 9 using the C-type carbon material supply unit 6B (S16 in FIG. 5). Addition step).

Next, the P-type carbon material granule 8B is directly charged into the charging chute 11 using the carbon material granule supply apparatus 6A (see FIG. 2) (S17 in FIG. 5).
At the same time, the granulated material for sintering 8 to which the C-type carbonaceous material supply unit 6B has been added is cut out by the roll feeder 10A and put into the charging chute 11 (S18 in FIG. 5).

C-type carbonaceous material granules 8C, since hardly collapsed than P-type carbonaceous material granules 8B, be charged to a surge tank 10 is added to the granulate 8 for sintering, NO _x reduction A sufficient effect is obtained. Therefore, in 2nd Embodiment, C-type carbon material granulated material 8C is added to the granulated material 8 for sintering in front of the surge tank 10.
Further, by adding the C-type carbon material granule 8 </ b> C in front of the surge tank 10, only the P-type carbon material granule 8 </ b> B is directly charged from the charging chute 11. Therefore, the carbonaceous granule supply device 6A can be reduced in size and simplified.

  The above is the description of the sintered ore manufacturing method using the sintered ore manufacturing apparatus 100A according to the second embodiment.

  As described above, in the second embodiment, the C-shaped carbon material granule 8 </ b> C is added to the granulation material 8 for sintering in front of the surge tank 10. The P-type carbon material granule 8 </ b> B is directly charged into the charging chute 11. Therefore, the carbonaceous granule supply device 6A can be reduced in size and simplified.

EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to an Example.
(Preliminary test)
First, in the production process of sintered ore, a preliminary test was conducted to find out where the carbonaceous granule is likely to be subjected to external force leading to collapse.
Specifically, using a sintering test apparatus 200 simulating a DL-type sintering machine shown in FIG. 6, the mixing time that the carbonaceous material granule undergoes in the mixing / conveying process was investigated using an accelerometer. .

  The configuration of the raw material blending device 50 and the raw material charging device 60 of the sintering test apparatus 200 is substantially the same as that of the sintered ore manufacturing apparatus 100. However, the weighing of the raw material supplied from the storage tank group 1 is performed by one weighing hopper 5. On the other hand, the wind box group 14 is provided with only five boxes, and dead plates 23 are provided at both ends of the wind box group 14 in the arrangement direction. In the pallet truck group 12, only three pallet trucks are connected. The pallet trucks at both ends are each provided with an air leakage cover 25 and an electric vehicle 12A. The electric vehicle 12 </ b> A is a device that drives the pallet truck and also serves as the air leakage cover 25.

In the operation of the sintering test apparatus 200, the raw materials are blended by cutting out raw material brands used for the weighing hopper 5 while weighing them one by one. The raw material granulation and charging into the pallet carriage group 12 are the same as those of the sintered ore manufacturing apparatus 100.
At the time of sintering, the pallet truck group 12 stops on the wind box, and the wind leak cover 25 or the electric vehicle 12A comes into contact with the dead plate 23, thereby bringing the wind box and the pallet truck group 12 into close contact with each other while preventing air leakage. It differs from the sintered ore manufacturing apparatus 100 in that sintering is performed.

Using this sintering test apparatus 200, a sintered raw material containing iron ore, carbonaceous material, and lime source was granulated using a raw material blending apparatus 50 and a raw material charging apparatus 60 and charged into the pallet truck group 12. .
At this time, a peristaltic meter was added to the sintering raw material. The peristaltic meter is a measuring instrument that is counted once when an acceleration equal to or higher than the acceleration (0.2 G) necessary for mixing the granulated material is applied. Here, a pedometer (OMRON OMRON HJ-005) was used.
After the sintered raw material was charged into the pallet carriage group 12, the peristalsis was collected and the count number was calculated.

The following three locations were used for the peristaltic meter.
Case 1: Drum mixer 6 entrance.
Case 2: Belt conveyor 9.
Case 3: charging chute 11.

Since the granulation processing time in the drum mixer 6 is 60 seconds, the accumulated time during which the acceleration was applied was determined based on the collected count value of the perimeter. As a result, it was found that the drum mixer equivalent rocking time in the surge tank 10 was 60 seconds and the drum mixer equivalent rocking time on the charging chute 11 was about 10 seconds.
Therefore, it was found that Case 1 and Case 2 are more likely to receive an external force that causes the carbonaceous material granule to collapse than Case 3.

  Further, the post-addition granulation time of LCC in Patent Documents 1 and 2 is about 10% of the total granulation time. That is, in the drum mixer 6, it corresponds to about 6 seconds. This is about 60% of Case 3. Therefore, it was speculated that the carbonaceous granulated product could be sufficiently mixed with other granulated products even at the charging position of case 3.

(Sintering experiment)
Next, using a sintering test apparatus 200, P-type and C-type carbonaceous material granulates were charged at different positions to perform a sintering test, and the relationship between the charging position and the NO _x generation amount was evaluated. . The specific procedure is as follows.
First, two types of P-type and C-type shown in Table 1 were prepared by granulation as a carbonaceous material granulated product.

  Next, a carbonaceous granulated product and other sintered raw materials were prepared in the ratios shown in Table 2. The ratio of the carbonaceous granulated material in Table 2 is an outside number.

Next, using the sintering test apparatus 200, the iron ore, limestone, and return ore shown in Table 2 were introduced from the collective conveyor 4.
Further, the carbonaceous material granule was charged from the same three positions as in case 1 to case 3 of the preliminary test and sintered, and the amount of NO _{x in} the exhaust gas was measured with an infrared absorption type continuous gas analyzer.

  In Case 3, a belt feeder was temporarily installed on the charging chute 11 and the carbonaceous granulated material was charged.

The measurement results of NO _x are shown in Table 3. Figures, P-type, for each of the C-type, based on the amount of NO _x of the case 1, to calculate the amount of NO _x of the case 2, and case 3 as reduction rate from the case 1.

When using a P-type carbonaceous material granules 8B, case 2 and 3, NO _x amount is lower than the case 1. Case 3 had a larger NO _x reduction rate than Case 2.
On the other hand, when a C-type carbonaceous material granules 8C, the case 2 is _the amount of NO _x than the case 1 is reduced, the difference in reduction rate of the case 2 and case 3 as compared to the P-type It was small.

From the above results, it was found that the P-type carbon material granule 8B is directly charged on the charging chute 11 to increase the NO _x reduction effect. It was also found that the C-type carbonaceous material granule 8C had a sufficient NO _x reduction effect when charged before the surge tank 10.

Furthermore, the product yield of case 1 to case 3 was obtained from the following equation (1).
Product yield = {product sinter ore mass / (product sinter ore mass + return ore mass)} x 100 (1)
The results are shown in Table 4.

In all cases, the product yield was about the same, and the impact of the carbonized granule input position on the product yield was small.
From this result, it was confirmed that the mixing on the charging chute 11 was sufficient for mixing the sintered raw material and the P-type carbon material granulated product.

  DESCRIPTION OF SYMBOLS 6 ... Drum mixer, 6A ... Carbonaceous granule supply apparatus, 6B ... C type carbonaceous material supply part, 9 ... Belt conveyor, 10 ... Surge tank, 11 ... Charging chute, 12 ... Pallet cart group, 13 ... Ignition furnace 35 ... carbon material granulation mixer, 37 ... C-type carbon material granulation mixer, 39 ... limestone storage unit, 50 ... raw material blending device, 60 ... raw material charging device, 70 ... carbon material granulation unit, 100 ... sintering Mining production equipment.

Claims (5)

A raw material granulation step for sintering, wherein a raw material for sintering containing at least an iron source is granulated to obtain a granulated material for sintering;
Under-sieving carbon material obtained using a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less, and a lime source under a sieving obtained using a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less A carbonaceous material granulation step for granulating a carbonaceous material granulated product comprising
The charcoal granulated material and the granulated material for sintering can be obtained by directly charging the charcoal material granulated material into the charging chute and simultaneously charging the granulated material for sintering into the charging chute from a surge tank. A charging step of mixing an object on the charging chute and charging the pallet;
The manufacturing method of the sintered ore characterized by implementing. It is a manufacturing method of the sintered ore of Claim 1, Comprising:
The carbonaceous material granulation step,
A classification step of classifying the carbonaceous material in advance with a sieve having a classification point of 0.5 mm or more and 1 mm or less;
The first carbonaceous material granule is produced by granulating the sieving in the classification step and the lime source under the sieving obtained using a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less. The manufacturing method of a sintered ore characterized by implementing 1 carbonaceous material granulation process. It is a manufacturing method of the sintered ore according to claim 2,
2nd which manufactures the 2nd carbonaceous material granulated material which granulated on the sieve of the said classification process, and the lime source of the sieving obtained using a sieve with a classification classification point of 0.5 mm or more and 1 mm or less The carbonaceous material granulation process,
Before adding the sintered granulated product to the surge tank, an addition step of adding the second carbonaceous material granulated product,
The manufacturing method of the sintered ore characterized by implementing.   The method for producing a sintered ore according to any one of claims 1 to 3, wherein the carbonized material granule includes the raw material for sintering. A granulating part for granulating a sintering raw material containing at least an iron source to produce a granulated material for sintering; and
A surge tank for storing the granulated material for sintering;
Under-sieving carbon material obtained using a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less, and a lime source under a sieving obtained using a sieve having a sieving classification point of 0.5 mm or more and 1 mm or less A carbonaceous granulation part for granulating a carbonaceous granulated product containing
A pallet into which the granulated material for sintering and the carbonaceous material granulated material are charged;
A charging chute that serves as a guide when charging the granulated material for sintering and the granulated carbonaceous material into the pallet;
A carbonaceous material input part that directly inputs the carbonized material granule into the charging chute;
A sintered granule charging unit for charging the sintered granulated material from a surge tank into the charging chute; and
An ignition furnace for sintering the granulated material for sintering and the carbonized material granulated material charged in the pallet;
An apparatus for producing sintered ore, comprising:

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