JPH10281652A - Method for loading sintering material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the bulk density of sintering material by blasting high speed air to the flow of sintering material dropping along the upper surface of a chute reducing the dropping speed of it, in forming sintering material layer on a palette by cutting out the sintering material from a feeding hopper and dropping it along the upper surface of the sloping hopper. SOLUTION: In sintering a sintering material layer 6 fed on a palette 5 by Dwight-Lloyd sintering machine, the sintering material cut out from the feeding hopper 1 with a drum feeder 2 is dropped along the upper surface of a sloping chute 3 and formed as the sintering material layer 6 on the palette 5 moving in the direction of an arrow A. A high speed air jetting header 7 arranged with multiple jetting nozzles 4 in the direction of length is arranged so that the high speed air is jet to the direction opposing the flow of the sintering material dropping along the upper surface of the chute 3. Therefore, the dropping speed of the sintering material is reduced and the bulk density of the sintering material layer is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a sintering raw material from a feeder hopper of a Dwyroid type sintering machine (hereinafter referred to as a DL type sintering machine) using a drum feeder and dropping it on a sloping chute. The present invention relates to a method for charging a sintering raw material for forming a sintering raw material layer on a pallet.

[0002]

2. Description of the Related Art A sintering raw material cut out from a feeder hopper using a drum feeder, dropped on a sloping chute and formed on a pallet is deposited in a downward suction type DL sintering machine. The heat transfer characteristic from the upper part to the lower part in the sintering raw material layer increases the temperature and the air permeability as the temperature becomes lower in the lower layer part. For this reason, the sintering raw material on the pallet generally reduces the bulk density of the sintering raw material layer deposited on the pallet to increase air permeability from the viewpoint of uniform product strength, and the particle size distribution is The segregation state with many fine grains in the upper layer and more coarse grains in the lower layer,
In addition, it is said that a coke state in which the coke is large in the upper layer and small in the lower layer is preferable.

In the conventional charging method, a sloping chute is provided at the lower portion of the drum feeder to enhance the particle size segregation by utilizing a percolation effect when the sloping chute falls on the sloping chute, or disclosed in JP-A-61-223136. As disclosed, by providing a screen made of slit-shaped strips extending along the charging flow of the sintering raw material,
Improve air permeability and sinter ore yield by reducing the bulk density of the sintering material layer formed on the pallet, and by segregating fine particles in the upper layer and coarse particles in the middle and lower layers Can be achieved.

[0004] However, merely providing a sloping chute at the lower portion of the drum feeder may not provide sufficient segregation of the particle size, and may not provide the desired sintering material layer with air permeability. On the other hand, when a screen made of a slit-shaped material is provided, the sintering material having a water content of about 7% adheres to the slit-shaped material, and the initially expected segregation state of the sintering material is stably maintained. There was a problem that it was difficult.

In Japanese Patent Application Laid-Open No. 63-263386, a plurality of wires are installed in the direction perpendicular to the flow of the sintering raw material, and the area of the opening between the wires is adjusted to adjust the sintering material layer. It has a low density and a segregation state in which fine grains are present in the upper layer and coarse grains are present in the lower layer, thereby improving the yield and productivity of the sintered ore. In this method, the adhered raw material is removed by moving the wire using a winding drum. However, once the sintering material adheres between the wires, the removal becomes difficult, and a stable air permeability is obtained. There was a problem that securing was difficult.

Further, as a method of improving the segregation state using wind power, for example, Japanese Patent Publication No. Hei 6-27292 and
JP-A-34142 discloses a method of blowing an air stream on a sintering raw material under a sloping chute. In this method, since a gas stream is blown horizontally to the sintering raw material, there is a problem that the segregation is insufficient because a residence time enough to impart segregation to the raw material is not obtained, and the effect of lowering the bulk density is small. Was.

JP-A-61-124535 and JP-A-61-73840 disclose a method of blowing an airflow from below onto a sintering raw material layer deposited on a pallet. This method
Once the sintering material layer is deposited, the friction between the particles is large, so rearrangement due to the movement of coke particles is unlikely to occur and the effect of improving segregation of coke distribution and material particle size is small, and the required air volume is large, so excessive equipment is required There was a problem that cost was required.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and reduces the bulk density of a sintering raw material layer charged on a pallet from a sloping chute without requiring a large capital investment. It is possible to achieve a grain size segregation state in which finer ore and lighter specific coke are charged to the upper layer while lowering, and coarser ore and more coke with less coke are charged to the lower layer in the lower layer. It is an object of the present invention to provide a method for charging a sintering raw material that can be performed.

[0009]

In order to achieve the above object, the present invention provides a pallet by cutting a sintering raw material from a feed hopper of a Dwyroid type sintering machine by using a drum feeder and dropping the raw material on a sloping chute. In the method for charging a sintering raw material on which a sintering raw material layer is formed, the sintering raw material is fired on a pallet while blowing high-speed air from a downstream side of the sloping chute against a flow of the sintering raw material falling on the sloping chute. This is a method for charging a sintering raw material, which comprises forming a binding raw material layer.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In the present invention, the sintering raw material layer 6 charged on the pallet 5 using the sintering raw material charging apparatus shown in FIGS. 1 and 2 is sintered by a DL-type sintering machine. in this case,
The sintering raw material cut out from the mining hopper 1 using the drum feeder 2 falls on the sloping chute 3 and is loaded on the pallet 5 moving in the direction of arrow A to form the sintering raw material layer 6.

In the present invention, the high-speed air jet header 7 is arranged horizontally in the chute width direction with the sloping chute 3 positioned at the downstream side of the chute of the sintering raw material that slides down. An ejection nozzle 4 is provided. Here, the plurality of ejection nozzles 4 are directed in a direction opposite to the flow of the sintering material falling on the sloping chute 3, and high-speed air is ejected to the sintering material falling on the sloping chute 3. For this reason, since the falling speed of the sintering raw material that falls from the sloping chute 3 onto the pallet 5 decreases, the bulk density of the sintering raw material layer 6 deposited on the pallet 5 can be reduced.

At this time, the falling speed of the sintering raw material decreases as the grain size of the sintering raw material decreases and the specific gravity decreases, so that fine ore and coke having a low specific gravity are deposited on the upper layer of the sintering raw material layer 6. A segregation state is obtained in which coarse ore and relatively large coke are charged in the middle and lower layers. The ejection speed of the high-speed air ejected from the ejection nozzle 4 is preferably adjusted to fall within a range of 10 to 20 m / sec depending on the particle size composition of the raw material ore and coke in the sintering raw material, and the falling speed of the sintering raw material is adjusted. . This is because high-speed air ejection speed is 10m /
If the time is less than 2 seconds, the drop in the falling speed of fine particles and coke in the sintering raw material is small, and the particle size segregation of the sintering raw material layer 6 becomes insufficient.
Further, even if the speed exceeds 20 m / sec, the effect of increasing the particle size segregation does not increase so much and the particles become saturated.

In a DL type sintering machine having an effective sintering area of 210 m ^2, a sintering raw material is cut out from a feed hopper 1 by using a drum feeder 2, dropped on a sloping chute 3 and charged on a pallet 5. Then, high-speed air is blown from a blowing nozzle 4 located on the downstream side of the chute 3 so as to face the sintering material falling on the sloping chute 3, and the falling speed of the sintering material falling on the pallet 5 from the sloping chute 3 is reduced. Let it. As a result, the bulk density of the sintering raw material layer 6 deposited on the pallet 5 is reduced, and the segregated state is such that fine ore and coke having a low specific gravity are charged into the upper part of the sintering raw material layer 6. At this time, the mixing ratio of the sintering raw materials used is shown in Table 1, and the operating conditions of the sintering machine (layer thickness of the sintering raw material layer, Table 2 shows the raw material moisture and the high airflow velocity.

[0014]

[Table 1]

[0015]

[Table 2]

Table 3 compares the bulk densities of the upper, middle and lower layers of the sintering raw material sampled before ignition of the sintering raw material layer, the average particle size of the raw material, the coke ratio, and the sintering results in Table 3 for the present invention and the conventional example. Shown.

[0017]

[Table 3]

As is clear from Table 3, when the present invention example in which high-speed airflow is blown to the sintering raw material is compared with the conventional example, the bulk density distribution in the layer thickness direction is 1.75 t / m ^{3 in the} upper layer of the conventional example. 1.90t / m ³ in the middle, compared to has a 2.10t / m ³ in the lower layer,
Each In the present invention embodiment ^{1.75t / m 3, 1.85t / m} 3, it can be seen that a 1.90t / m ³ are smoothed. The average bulk density of the way the sintering raw material layer, 1.83t / m ³ of the present invention example from 1.92 T / m ³ in the prior art
Could be reduced.

Regarding the particle size distribution, the average particle size of the ore in each layer is 3.1 mm in the upper layer and 3.2 m in the middle layer in the case of the conventional example.
m and 3.6 mm in the lower layer, respectively, and it can be seen that in the example of the present invention, the grain size segregation was enhanced to 2.7 mm, 3.2 mm and 3.6 mm, respectively. Furthermore, the coke ratio in the conventional example is 4.1% in the upper layer, 3.9% in the middle layer, and 3.4% in the lower layer, whereas the coke ratio in the present invention is 4.5%, 4.0%,
It can be seen that the coke segregation to the upper layer was enhanced at 2.9%. By improving the permeability of the sintering raw material layer based on the change in the deposition state of the sintering raw material, the sintering time is shortened in the present invention example as compared with the conventional example, and the sintering yield is improved. Was able to improve productivity by about 20%.

[0020]

As described above, according to the present invention, the sintering material is charged onto the pallet while applying high-speed air to the sintering material falling on the sloping chute, thereby reducing the falling speed of the sintering material. Therefore, the bulk density of the sintering material layer deposited on the pallet can be reduced. In addition, a segregation state is obtained in which fine ore and coke having a low specific gravity are charged into the upper layer. Such a change in the deposition state of the sintering raw material improves the air permeability of the sintering raw material layer and the yield of the sinter, and as a result, the productivity of the DL-type sintering machine is significantly increased.

[Brief description of the drawings]

FIG. 1 is a side view showing a sintering raw material charging apparatus of the present invention.

FIG. 2 is a perspective view showing a sintering raw material charging apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mining hopper 2 Drum feeder 3 Sloping chute 4 Jet nozzle 5 Pallet 6 Sintering material layer 7 High-speed air jet header

Claims (1)

[Claims] 1. A sintering raw material is cut out from a feeder hopper of a Dwyroid type sintering machine using a drum feeder, and is dropped on a sloping chute to form a sintering raw material layer on a pallet. Forming a sintering material layer on a pallet while blowing high-speed air from a downstream side of the sloping chute against a flow of the sintering material falling on the sloping chute. How to charge.