JPH01104725A - Method for charging sintering raw material - Google Patents

Abstract

PURPOSE:To improve the strength, sintering yield and productivity of sintered ore by classifying sintering raw materials by a slit chute, then segregating the materials further by a lower chute at the time of obliquely gliding the sintering raw materials and supplying the same to a traveling pallet. CONSTITUTION:The sintering raw materials 1a are obliquely glided on an approach chute 2 and are supplied to the traveling pallet 7 via the slit chute 3 formed by tensing plural pieces of wire-shaped members 4, 5. The spacings between the wire-shaped members 4 are set smaller than the spacings between the wire-shaped members 5. The very fine-grained raw materials 1b of the sintering raw materials 1a are classified and dropped first. The tine-grained raw materials 1c are then classified and dropped by the wire-shaped members 5; further, the materials are subjected to grain size segregation by the lower chute 6 provided below the slit chute 5 in parallel therewith. The coarse-grained raw materials 1d which do not pass the slit chute 3 fall straightly from the front end of the chute 3. The sintering raw material layers 8 consisting of the lower layer part 8a of the coarse grained raw materials 1d, the upper layer part 8b of the fine-grained raw materials 1c and the uppermost layer part 8c of the very flue grained raw materials 1b are thereby formed on the traveling pallet 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an optimal method for charging raw materials into a sintering machine, which brings about the same effects as the strength % sintering yield of sintered ore and productivity. This invention relates to a charging method for obtaining a raw material charging condition.

(Prior art) Traditionally, in the steel industry, when producing sintered ore to be charged into a blast furnace, iron ore powder of approximately 10 or less grains is mixed with coke of an appropriate particle size and, if necessary, limestone powder. This is a sintering machine that mixes the coke and charges it into the roasted J@/gelette, then ignites the counterfeit coke, burns the coke while sucking air downward, and uses the combustion heat to sinter the fine ore. is used.

In such a sintering machine, since sintering progresses by burning coke, the supply of air to the sintered layer, that is, the quality of ventilation of the sintered i-layer, is a major factor that influences productivity. .

In this case, if the raw material or coke is distributed with a uniform particle size in the height direction of the sintered layer, the temperature will increase toward the lower layer due to the characteristics of heat movement within the sintered layer, and the air resistance will increase. Therefore, in the sintering machine, the raw material is charged by segregating the grain size of the raw material so that coarse grains are in the lower layer and fine grains in the upper layer, and carbon segregation is performed to increase the amount of coke in the upper layer. A sintered layer is formed. In this case, carbon is unevenly distributed in fine grains in the raw material, so making the grain size segregation finer in the upper layer means that the carbon concentration will be higher in the upper layer.In other words, the target carbon segregation will follow the grain size segregation. It is. In this way, the ventilation resistance within the sintered layer is reduced, the coke combustion efficiency is improved, and the temperature distribution is improved.

The aim is to obtain high quality sintered ore with the same sintering yield.

In order to achieve the above object, a charging method using the apparatus shown in FIG. 5 has conventionally been carried out. This is hopper 5
1 through the feeder 52.
+53, a sloping chute 54 was installed to allow the sintering raw material to slide down the chute surface, and when the sintering raw material slides down the chute surface, the grain size segregation caused by the difference in sliding speed between coarse and fine grains of the raw material was used. This is a charging method in which raw material layer 56 is formed by charging the pallet 55 such that coarse grains are deposited in the lower layer and fine grains are deposited in the upper layer.

As a method of using the position shown in Figure 6.

This receives the sintering raw material 63 that is dropped and supplied from the hopper 61 via the feeder 62, and first slides it down on the run-up chute 64. Slit shade 65 formed by tensioning the members in the width direction of the nonolet
is provided to classify the sintering raw material 63 into fine grain raw material 63b which falls from the opening of the chute 65 and coarse grain raw material R63a which is charged into the pallet 66 as it is without falling through the opening ft. The fine raw material 63b is further segregated by a deflector chute 67 provided at the raw material falling part of the slit chute 65 and charged into a pallet 66, where the coarse raw material 63a is in the lower layer.

Further, a raw material layer 68 is formed in the upper layer portion by depositing fine grained raw material 63b.

[Problem that the invention seeks to solve]

By the way, in order to increase the strength and yield of sintered ore,
It is desirable for grain size segregation and carbon segregation in the height direction of the pallet to be fine and carbon concentration to be high in the upper layer, but in the former method, grain size segregation is greatly affected by the amount of raw material supplied. In addition, the sintering raw material filling state was far from the optimum particle size and carbon segregation, which was not preferable from the viewpoint of the strength of the ascent ore (1 yield p).

In the latter method, the amount of raw material supplied is divided by a slit chute and further segregated by a deflector chute to improve particle size and carbon segregation. Although there is an effect on the overall particle size and carbon segregation, the particle size and carbon segregation are still insufficient near the surface layer where the finest particles are desired. In addition, when the raw material slides down the slit chute that performs classification, the front part of the linear member receives a larger amount of raw material sliding down than the rear part, so the linear member wears out significantly, and therefore requires a lot of maintenance. Along with the high cost.

I'm afraid that there are problems such as having a negative effect on the classification effect.

The present invention solves the above problems and achieves an optimal raw material charging condition.
To provide a method for charging sintering raw materials that is easy to maintain and maintain.

[Means for solving problems]

In order to solve the above problems, the technical means of the present invention are as follows:
6. The sintering raw material dropped from the hot spring 7 and supplied onto the run-up chute via the feeder is allowed to slide down the slope, and a slit chute in which a plurality of linear members are tensioned in the width direction is provided on the extension line of the chute.6. The gap between the linear members at the top of the slit chute is made smaller than the gap at the rear, and the fine raw material of the fC sintering raw material that is slid down is classified and dropped from the top of the slit chute, and then fine particles are collected from the bottom. The raw material is classified and descended, and is segregated down by the lower chute installed at the lower part of the slit chute. Coarse grained raw material that slides down without passing through the slit chute is dropped from the tip of the chute and sent to the lower layer of the running noserent. The sintered raw material layer is formed by sequentially charging coarse grained raw materials, fine grained raw materials segregated in the upper layer, and fine raw materials in the uppermost layer. This method of charging sintering raw materials is characterized in that the width of the wire members at the rear of the entire diameter is increased to reduce the gap between the wire members, and the fine raw materials are classified and dropped from the upper part of the wire members.

[For production]

According to this charging method, fine raw materials are dropped from the upper part of the slit chute with a small gap, fine raw materials are dropped from the lower part with a larger gap than the upper part, and coarse raw materials that do not pass through the slit chute are dropped from the tip of the slit chute. The sintering raw material is classified into three types of particle sizes, and particularly fine raw materials are efficiently charged directly from the chute to the top layer without mixing with other raw materials. Therefore, it is possible to obtain an optimal raw material charging state in which the upper layer is made of fine raw materials.

In addition, since the spacing between the linear members at the top of the slit chute is narrow, the impact of the raw material flow from the run-up chute is alleviated, and the
(By increasing the diameter of the wire member, the lifespan against wear becomes longer even if the amount of raw material supplied increases, which is also advantageous in terms of maintenance.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a schematic side view illustrating the charging method of the first embodiment. The sintering raw material 1a, which is dropped and supplied from the hopper via a feeder (not shown), slopes down on the run-up chute 2. A slit chute 3 is provided on the extension line of the chute 2, in which a plurality of linear members such as wire lobes or rods are stretched in the width direction. 4 is made smaller than the gap between the linear members 5 at the rear, and among the sintered raw materials 1a that have slid down the slope, the fine raw materials 1b are first classified and dropped by the linear members 4. Then, among the sintered raw materials 1a that slid down the slit chute 3, fine grained raw materials 1c
is classified and dropped by the linear member 5 at the rear. A lower chute 6 is provided in parallel to the slit chute 3 at the raw material falling position in the vertical lower part of the rear linear member 5, and the fine grained raw material 1c that has fallen by one class is further subjected to particle size segregation while sliding down the surface of the lower chute 6. It is carried out. slit shoot 3
The coarse f-grain raw material 1d that slides down on the slit chute 3 without passing through drops from the tip of the chute 3 as it is.

The sintered raw materials classified as described above are first charged with the coarse raw material 1d in the lower layer 8a of the traveling pallet 7, then with the fine raw material 1c in the upper layer 8b, and with the fine raw material 1b in the uppermost layer 8c. Each is charged and sintered raw material/! ! 8 is formed.

Figure 2 is approximately 1+11 explaining the charging method of the second embodiment.
This is a top view of the linear member of the slit chute 3 in the first embodiment, with the center distance of the member being the same, and the diameter of the linear member 5a at the rear being larger at a certain distance at the top. , the slit chute 3a is formed by arranging linear members 4a with small member gaps,
The other configurations of the run-up chute 2a and the lower chute 6a are the same as in the first embodiment/example 7. In this way, 1h of fine raw material is extracted from the linear member 4a at the top of the slit shoe) 3a.
The fine grain raw material 1c is dropped from the lower linear member 5a via the lower chute 6a, and the coarse grain raw material 1a is dropped from the tip of the slit chute 3a, and a sintered raw material layer is similarly deposited on the pallet 7. 8.

In addition, in this charging method, the slit chute 3.3a
The range of the total length of the slit chute 3, 3a (7)lO to 5ON is preferable as the constant distance for reducing the gap between the linear members at the upper part of the slit chute. Outside this range, the effect of classification will be small, but basically it is finer. It should be determined by the rfJ thickness of the top layer.

Further, when the diameter of the upper linear member is increased to reduce the gap, the diameter is preferably three times or less than that of the lower member. If the diameter becomes too small, the classification effect will be reduced, but even if the diameter is too large, the total area of the gaps will become small, and the effect will also be reduced.

Figures 3 and 4 are drawings showing comparative examples of grain size and carbon concentration in the height direction of sintered nocerets between the conventional method and the charging method of the present invention. Especially in the uppermost layer of 500 mm or more of the raw material layer, fine raw materials are segregated, and carbon 8 degree is similarly high in the uppermost layer, so that a raw material layer with preferable particle size and carmen segregation from the viewpoint of raw material firing is obtained. I was able to do that.

〔Effect of the invention〕

As explained above, the charging method according to the present invention is as follows.

By adjusting the gap between the linear members of the slit chute and charging the sintering raw material after classifying it into three types, the charged sintering raw material has a better segregation effect, especially in the top layer. The part is charged with fine and carmen segregated raw materials. Therefore, an optimal raw material layer with coarse grains in the lower layer and fine grains and high carbon concentration in the uppermost layer is formed, which improves air permeability and combustion efficiency during firing, as well as improving the thermal history of the sintered layer. Uniformity is achieved, and the same yield of strength and productivity of the sintered ore can be achieved. Furthermore, the upper part of the slit-chute reduces the gap between the members to reduce the impact of the raw material flow.
Furthermore, by increasing the diameter of the members, their durability against wear increases, which is advantageous in terms of maintenance.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view illustrating the charging method of the first embodiment of the present invention, Fig. 2 is a road side view illustrating the charging method of the second embodiment, and Fig. 3 is a particle size segregation diagram. FIG. 4 is a drawing showing a comparative example of carbon concentration, and FIGS. 5 and 6 are schematic side views of an apparatus used in the conventional charging method. 1a...Sintering raw material, 1b...Fine raw material, 1c...
Fine grain raw material, ld... Coarse grain raw material, 2, 2a... Run-up chute. 3.3a...Slit shoot, 4.4a%5,5a
・−. Linear member, 6, 6a... Lower part chute, 7... Pants, 8... Sintering raw material layer, 8a... Lower layer part, 8b
...Upper layer, 3c...Top layer. Agent Patent attorney Masamitsu Akizawa and 1 other person 71'3 Figure 4 Power - Density (7,)

Claims (2)

[Claims] (1) The sintering raw material dropped from the hopper via the feeder onto the run-up chute is allowed to slide down the slope, and a slit chute in which a plurality of linear members are tensioned in the width direction is provided on an extension of the chute, and the slit The gap between the linear members at the top of the chute is made smaller than the gap at the rear, and the fine raw materials among the sintered raw materials that have been slid down are classified and dropped from the top of the slit chute, and then the fine grain raw materials are classified from the bottom. As the raw material is lowered, it is segregated down by the lower chute installed at the lower part of the slit chute, and the coarse raw material that slides down without passing through the slit chute is dropped from the tip of the chute, and the coarse raw material is deposited in the lower layer of the traveling pallet. 1. A method for charging sintering raw materials, comprising sequentially charging fine raw materials segregated in the upper layer and fine raw materials in the uppermost layer to form a sintering raw material layer. (2) The diameter of the linear member at the top of the slit chute is made larger than that of the linear member at the rear to reduce the gap between the linear members,
The method of charging sintering raw materials according to claim 1, characterized in that fine raw materials are classified and dropped from the upper part.