JPH07258755A - Production of sintered ore - Google Patents

Abstract

PURPOSE:To make the sintering speed in the transverse direction of a pallet uniform. and to improve the quality of products over the entire part thereof by heating raw materials to be sintered in a surge hopper to a specific temp. only in the side wall parts thereof, packing the raw materials into the pallet in such a manner that the heated parts exist near the side walls of the pallet and igniting the raw materials. CONSTITUTION:The raw materials 1 which are to be heated and exist in the side wall parts 2a in the surge hopper 2 are heated to 50 deg.C to 100 deg.C (heating width 12 is about 0.3m) by blowing hot air from a hot air pipe 13 into the surge hopper at the time of charging the raw materials 1 to be sintered into the sintering pallet 8 of a lower suction type sintering machine. The raw materials 1 to be sintered are charged via a chute 3 by a drum feeder 2b into the sintering pallet 8 to form a packed bed 6 consisting of a packed bed 6d heated near the side wall parts 8a and a packed bed 6e not heated in the central part. The sintering is executed by igniting the coke in the surface layer part of the packed bed 6, by which the sintering speed of the transverse direction of the pallet is made uniform, the sintering time is shortened and the yield is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sintered ore as a raw material for producing hot metal in a blast furnace or the like.

[0002]

2. Description of the Related Art A conventional sinter production process is shown in FIG. Conventionally, a sinter having a size of 5 mm or more and usually a sinter having a size of 15 to 20 mm are sieved to form a bedding 5, and the slab of a bedding hopper 4 is loaded on the grate at the bottom of the pallet 8 to a thickness of 30 mm. Sintering ore Main raw material iron ore, auxiliary raw material limestone, fuel coke, and return ore are conditioned and granulated, and the sintered raw material 1 is conveyed to a surge hopper 2 for storage, and then a drum feeder 2
It is cut out by b and is charged on the bedding 5 of the pallet 8 through the chute 3 to form the raw material filling layer 6. In the case of sintering using iron ore as the main raw material, the thickness of the raw material filling layer 6 is usually 60.
It is 0 mm. Ignition furnace 7 on the surface coke of raw material packed bed 6
Is ignited, the coke is burned while sucking air downward, and the combustion raw material sequentially sinters the sintering raw material from the upper layer to the lower layer.

In the above-mentioned conventional method, for example, Japanese Patent Laid-Open No.
No. 7-196996 discloses a method of heating the entire sintering raw material in the surge hopper 2 with hot air, and Japanese Patent Laid-Open Publication No. 57-198223 discloses that the sintering raw material is used as a sintering raw material. A method of blowing hot air is described.

[0004]

According to the conventional method, the ventilation of the raw material filling layer 6 in the pallet width direction has a distribution in which it becomes greater in the vicinity of the side wall of the sintered pallet. For this reason, the sintering is accelerated closer to the inside of the pallet side wall, and as shown in FIG. 5, the sintering speed of the sintered layer near the inside of the pallet side wall becomes faster than that of the center portion in the pallet width direction, and the pallet width direction center portion is burned. When the binding is not completed, the sintering in the vicinity of the side wall of the pallet is completed and the sinter cake 6c is formed. Since the portion of the sinter cake 6c has a smaller air flow resistance than the central portion of the sintered layer 6b and the raw material layer 6a in the pallet width direction, air is selectively sucked into the portion of the sinter cake 6c near the inside of the pallet side wall, so Suction of air in the center is reduced, and the sintering process is extremely delayed. For this reason, the central portion of the raw material layer 6a remains forever, the sintering time is significantly lengthened, and the productivity is greatly reduced. Further, the vicinity of the inside of the pallet side wall absorbs heat, and the pallet side wall absorbs heat, so that the yield (yield) of products of 5 mm or more decreases.

To solve the above problem, Japanese Patent Laid-Open No. 57-1969
According to the method described in Japanese Patent Laid-Open No. 96-198223, it is not possible to make the sintering rate in the width direction of the pallet uniform, and heating causes a decrease in water content as a binder, resulting in a granulated sintering raw material. Since it is broken, the ventilation of the raw material filling layer is deteriorated and the sintering time is lengthened, which cannot be said to be a sufficient solution.

[0006]

According to the present invention, when a sintering raw material is charged into a sintering pallet in a lower suction type sintering machine, the side wall of the surge hopper is sintered by a heating means provided in the side wall of the surge hopper. The raw material is heated to 50 ° C. or more and less than 100 ° C., the sintering raw material is charged into a portion of the raw material packed layer in the vicinity of the side wall of the sintering pallet, and then the surface coke of the raw material packed layer is ignited and sintered. It is a method for producing a sintered ore. Heating is preferably performed by blowing hot air from a hot air tube installed on the side wall of the surge hopper, or installing an electric heating plate on the side wall of the surge hopper as a heating means.

[0007]

In the present invention, by heating the sintering raw material on the side wall of the surge hopper, the temperature of the sintering raw material on the side wall of the surge hopper is made higher than room temperature. Then, the water content as the granulation binder is reduced, the granulation sintering raw material is broken, and the raw material is finely granulated, so that the ventilation of the raw material filling layer is obstructed. Therefore, when the raw material is charged into the pallet, the ventilation of the raw material filling layer near the inside of the pallet side wall is lowered to the same level as the ventilation in the central portion of the pallet, and the ventilation amount in the pallet width direction becomes equal. Then, as in the progress of sintering in the latter half of the present invention shown in FIG. 3, the sintering speed in the pallet width direction becomes equal, the sintered layer 6b becomes equal to the lower layer in the pallet width direction, and the stagnation portion of the sintering occurs. Since it disappears, the sintering time is shortened.
Further, since the sintering time is made uniform, the quality of the product is improved as a whole. Further, the heat shortage in the vicinity of the side wall of the pallet is also eliminated because the temperature of the raw material becomes high, and the yield is improved. In this way, the productivity is greatly improved by shortening the sintering time and improving the yield.

The higher the sintering raw material temperature of the side wall of the surge hopper, the more preferable it is, and the range is from 50 ° C to less than 100 ° C. This is because at a sintering raw material temperature of less than 50 ° C., the water content as a granulation binder decreases little, and the heat shortage in the vicinity of the side wall of the pallet cannot be eliminated, and no effect is recognized. To set the sintering raw material temperature of
This is because the heating time is short and the amount of heat becomes huge, which is difficult.

Here, the side wall of the surge hopper is defined as a range within 1 m from the inside of both side walls of the surge hopper toward the center of the surge hopper. Similarly, the vicinity of the inside of the pallet side wall is a range within 1 m from the inside of both side walls of the pallet toward the center of the pallet, and the center of the pallet is the range of the remaining part other than the vicinity of the inside of the pallet side wall.

The sintering speed in the pallet width direction is judged by the cross-sectional red heat layer of the lowermost layer of the sinter in the discharging part. If the red heat layer near the pallet side wall is higher than the pallet center, the pallet side wall near It is judged that the sintering progresses slowly, and the temperature of the sintering raw material on the side wall of the surge hopper is lowered to improve the ventilation of the raw material filling layer to make the sintering progress uniform. If the red heat layer near the pallet side wall is lower than the pallet center, it is determined that the sintering progresses rapidly in the pallet side wall vicinity, and the temperature of the sintering raw material on the surge hopper side wall is increased.
The ventilation of the raw material filling layer is reduced to make the progress of sintering uniform.

[0011]

Embodiment 1 FIG. 1 shows an example of an apparatus for carrying out the present invention. FIG. 1A is a front view of the charging section, and FIG. 1B is a sectional view of the charging section. The sinter production process is performed by the conventional method shown in FIG.
It was formed with a thickness of m. Hot air tube 1 installed from surge hopper side wall 2a of surge hopper 2 to surge hopper side wall
The hot air discharged from the sinter cooler at 250 ° C. from No. 3 was blown into the sintering raw material on the side wall of the surge hopper. Heating width 12
Is 0.3 m, and the sintering raw material 1 heated to 85 ° C. while descending the heating width 12 is cut out from the drum feeder outlet 2 c by the rotation of the drum feeder 2 b, and the raw material is filled in the vicinity of the side wall of the sintering pallet. Layer 6d was formed with a width of 0.3 m. The sintering raw material 1 falling in the central portion of the surge hopper 2 other than the heating width 12 was not heated, and a packing layer 6e in the central portion of the pallet was formed in a width of 3.4 m in the central portion of the pallet. The coke in the surface layer portion of the raw material filling layer 6 formed by the raw material filling layer 6d in the vicinity of the side wall of the sintering pallet and the filling layer 6e in the central portion of the pallet was ignited in the ignition furnace 7.

Raw material filling layer 6d in the vicinity of the side wall of the sintering pallet
As shown in FIG. 3, the sintering speed in the pallet width direction was the same up to the lower layer because the temperature was increased, and the stagnation part of sintering disappeared. In addition, the heat shortage in the vicinity of the side wall of the pallet was eliminated and the yield was improved. For this reason, the productivity is 6 compared with the conventional 29.5 t / D / m ² by shortening the sintering time and improving the yield.
It was improved to 2t / D / m ² high 35.7t / D / m ^2.

[0013]

Second Embodiment FIG. 2 shows another example of an apparatus for carrying out the present invention. 2 (a) is a front view of the charging section, and FIG. 2 (b) is a sectional view of the charging section. The sintering ore manufacturing process is performed by the conventional method shown in FIG.
It was formed with a thickness of 0 mm. An electric heating plate 11 was installed from the surge hopper side wall 2a of the surge hopper 2 to the surge hopper side wall. By the nichrome wire in the heating plate 11, the heating plate 11
To 300 ° C. to heat the sintering raw material on the side wall of the surge hopper. The heating width 12 is 1.0 m, and the sintering raw material 1 heated to 90 ° C. while descending the heating width 12 is cut out from the drum feeder outlet 2 c by the rotation of the drum feeder 2 b, and the inside of the side wall of the sintering pallet. Part raw material filling layer 6d was formed to have a width of 1.0 m. The sintering raw material 1 falling in the central portion of the surge hopper 2 other than the heating width 12 was not heated, and a packing layer 6e at the central portion of the pallet was formed in the central portion of the pallet 8 with a width of 3.0 m. Raw material filling layer 6d in the vicinity of the side wall of the sintering pallet and filling layer 6 in the central portion of the pallet
The coke in the surface layer portion of the raw material filling layer 6 formed by e was ignited in the ignition furnace 7.

Material filling layer 6d near the side wall of the sintering pallet
As shown in FIG. 3, the sintering speed in the pallet width direction was the same up to the lower layer because the temperature was increased, and the stagnation part of sintering disappeared. In addition, the heat shortage in the vicinity of the side wall of the pallet was eliminated and the yield was improved. For this reason, the productivity is 7 compared with the conventional 29.5 t / D / m ² by shortening the sintering time and improving the yield.
It was improved to 7t / D / m ² high 37.2t / D / m ^2.

[0015]

According to the present invention, since the sintering becomes faster, the productivity is improved as compared with the conventional one.

[Brief description of drawings]

FIG. 1 shows an example of a device for implementing the invention.

FIG. 2 is a diagram showing another example of an apparatus for carrying out the present invention.

FIG. 3 is a diagram showing the progress of sintering in the latter half of the present invention.

FIG. 4 is a diagram showing a conventional sinter production process.

FIG. 5 is a diagram showing the progress of conventional sintering.

[Explanation of symbols]

 1 Sintering Raw Material 2 Surge Hopper 2a Surge Hopper Side Wall 2b Drum Feeder 2c Drum Feeder Exit 3 Chute 4 Flooring Hopper 5 Floor Bed 6 Raw Material Filling Layer 6a Raw Material Layer 6b Sintering Layer 6c Sinter Cake 6d Raw Material in Side Wall of Sintering Pallet Packed bed 6e Packed bed in the center of pallet 7 Ignition furnace 8 Pallet 8a Pallet side wall 11 Electric heating plate 12 Heating width 13 Hot air tube

Claims (3)

[Claims] 1. When charging a sintering raw material into a sintering pallet in a downward suction type sintering machine, the sintering raw material on the side wall of the surge hopper is heated to 5 by a heating means provided on the side wall of the surge hopper.
A firing characterized by heating to 0 ° C. or higher and lower than 100 ° C., charging the sintering raw material into the vicinity of the side wall of the sintering pallet of the raw material packed layer, and then igniting and sintering the surface coke of the raw material packed layer. Manufacturing method of calculus. 2. The method for producing a sintered ore according to claim 1, wherein when the sintering raw material on the side wall of the surge hopper is heated, hot air is blown from a hot air tube installed on the side wall of the surge hopper. 3. The method for producing a sintered ore according to claim 1, wherein an electric heating plate is installed on the side wall of the surge hopper when heating the sintering raw material on the side wall of the surge hopper.