JPS60243482A - Method of charging sintering raw material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method of charging raw materials in a DL sintering machine.

Conventional technology and its problems The charging of sintering raw materials into a DL type sintering machine is a factor that determines the quality of sintering. It is well known that the aim is to reduce the particle size and specific gravity segregation in the fuel cell, and to distribute more solid fuel such as coke in the upper layer and less in the lower layer.

As shown in Fig. 8, the conventional charging method is to transfer the raw material cut from the roll feeder (2) of the surge hopper (1) to the feed belt chute (3) or the deflector.
A method is used in which the material is loaded onto the sintering machine pallet (5) via a plate (not shown). That is, conventionally, by tilting the feed belt chute or deflector plate and letting the raw material flow down, the upper part of the packed bed OI on the pallet (5) is Fine grains are distributed in the lower layer, and coarse grains are distributed in large numbers in the lower layer. In addition, the charging amount is controlled by a level meter (H). However, this charging method has the following drawbacks.

■As shown in Figure 9 and Figure 10 showing the mixture grain size segregation and the mixture specific gravity segregation, the room temperature strength of the tumbler index of the manufactured sintered ore ( TI) in Figure 11. Bagen powdering index (
RDI) is shown in Figure 12. ■ The drop in quality from the roll feeder to the top of the pallet is nearly 2 to 3 m, which increases the falling speed of the raw material and increases the charging density. (2) The charging density changes greatly due to level control in the charging process, and it takes a lot of effort to properly adjust the charging amount.

Therefore, in the conventional charging method, the quality of the finished sintered ore cannot be sufficiently improved because the sintering raw material is not properly charged, and the power cost for the suction blower is also high.

Purpose of the Invention The present invention was made to eliminate the above-mentioned drawbacks of the conventional technology, and aims to homogenize the composition in the height direction of the V-trousers (1 m).
The purpose of this research was to propose a method for charging sintering raw materials to produce sintered ore of good quality.

Structure of the Invention The sintering raw material charging method according to the present invention is a method in which the sintering raw material cut out from the roll feeder of the surge hopper is charged onto the sintering machine pallet via the ore supply belt chute. An ore belt chute is provided horizontally, and the sintered raw material is cut out onto the ore feeding belt chute, and a metering device attached to the chute measures the charged raw material to perform quantitative cutting. It is.

In other words, this invention method reduces grain size and specific gravity segregation in the pallet height direction and homogenizes the raw material by leveling the Feed Pelton NEET and once receiving and charging the raw material cut from the roll feeder into the measuring device. It is also a method to reduce the charging density and improve ventilation in the packed bed by reducing the falling speed of the raw material from the roll feeder onto the pallet and soft charging.
Furthermore, this method aims to stabilize the charging density by weighing the charging raw material and performing quantitative cutting.

Hereinafter, the method of the present invention will be explained in detail based on the drawings.

FIG. 1 shows a device according to an embodiment of the present invention, (1)
is a surge hopper, (2) is a roll feeder, (3) is an ore feeding belt chute, (4) is a void meter, (5) is a sintering machine pallet, (6) is an ignition furnace, and (7) is a level meter. show.

That is, the roll feeder (2) of the surge hopper (1)
) The raw material cut out by the feed belt chute (3) installed horizontally falls onto the feed belt chute (3), and is passed through the void meter (4).
After being weighed and polished at the sintering machine pallet (5), the amount of raw material cut out is controlled by the opening of the surge hopper (1) exit gate (8), as shown in Figure 2. The amount of raw material cut out per unit time is determined by the speed of the roll feeder (2) and the amount of material cut out per unit time, and the amount of raw material cut out is measured by a void meter (4) attached to the ore feeding belt chute (3).

Further, the speed of the roll feeder (2) is controlled by a level meter (7) so that the level of the charged raw material is kept constant.

In addition, the raw material charging density is controlled by the ore feed belt chute (3
) can be controlled by the speed. That is, pallet density ρ2, surge hopper outlet density ρ. The thickness of the raw material layer on the ore feed belt chute (3) is determined by the ore feed belt speed vb, and the thickness of the raw material layer on the ore feed belt F chute (3) to reduce vb is determined by the following formula (1). increase more.

H: Thickness of the packed layer P: Pallet speed When the ore feeding belt speed vb decreases and the thickness of the raw material layer on the bell I increases, the force that presses the pallet in the vertical direction becomes relatively large, and the pallet The upper raw material density ρ2 will increase, which can be determined by Equation (2) in F.

ρ 2□ ・・・・・・・・・・・・・・・(21 formula%
Formula % L: Pallet width W: Raw material cutout amount Surge hopper outlet density ρ. is almost constant by keeping the height of the raw material in the nage hopper (1) constant, so by considering the relationship between the raw material density ρ on the pallet and the thickness of the raw material layer on the ore feed belt chute, the pallet The upper raw material density ρ can be controlled by the speed vb of the ore feeding belt shoe F.

Furthermore, particle size and specific gravity segregation can be controlled by changing the rotation direction and speed of the ore feed belt chute (3). In other words, this tendency becomes more pronounced as the belt speed increases.

Therefore, as shown in FIG. 3, by changing the rotation direction and speed of the ore feed belt chute, grain size and specific gravity segregation can be reduced.

Effects of the Invention As described above, according to method 1 of the invention, grain size and specific gravity segregation in the pallet height direction can be improved by controlling the rotation direction and speed of the horizontally installed ore feed belt chute. can. FIGS. 4 and 5 show the blend particle size segregation and blend specific gravity segregation investigated by the inventors using an actual machine. As is clear from this diagram, this invention method [
It can be seen that there are several cases of large particle size and specific gravity segregation in the pallet height direction.

Furthermore, the variation in quality of the finished sintered ore can be reduced and homogenized in the pallet height direction. Figure 6 shows the variation in the room temperature strength (TI) of the tumbler index of finished sintered ore, which was also investigated by the present inventors using an actual machine, and shows that the TI of the upper layer is improved due to the homogeneous distribution of coke and limestone. , an increase of about 0.8 coefficient compared to the conventional one. Further, FIG. 7 shows the variation in the reduction index (RDI), which is improved by about 10 coefficients compared to the conventional method because the soft charge improves ventilation in the packed bed and eliminates excessive heat in the lower layer.

In addition, the power and acid consumption of the suction blower can be reduced by improving the air permeability within the layer. Furthermore, quantitative cutting has the effect of reducing intralayer dissolution fluctuations.

As mentioned above, by leveling the ore feed belt chute, it not only makes the quality more homogeneous but also has great effects in terms of cost and operation.

[Brief explanation of drawings]

Figure wS1 is a schematic diagram showing the configuration of an apparatus for carrying out the method of this invention, Figures 2 and 3 are explanatory diagrams of the method of this invention, and Figure 4 is a diagram showing blended particle size segregation in the method of this invention. Figure 5 is also a diagram showing the mixture specific gravity segregation, No.
lr4 is a chart showing the variation in TI of finished sintered ore, Figure 7 is a chart showing variation in RDI of finished sintered ore, and Figure 8 is a schematic diagram showing the conventional charging method of sintering raw materials. The figure and the 9th column are the same.
Figure 10 is a chart showing the mixture specific gravity segregation, and Figure 11 is a chart showing the TI deviation of finished sintered ore.
Figure 12 is a chart showing the variation in RDI of finished sintered ore. 1... Liege lζshiba-12... Roll tweeter,
3...19] ;s belt shift L-1-14...boil
'Meter, 5-...Sintering machine bar 1/2...Ignition furnace, 7...1. ·belt. Applicant: Sumitomo Metal Industries, Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 7 Folds Middle lower fold X layer lining layer

Claims (1)

[Claims] In a sintering raw material charging method in which sintering raw material cut out from a surge hopper by a roll feeder is charged onto a sintering machine pallet via an ore supply belt chute, the ore supply belt chute is provided horizontally, and the sintering material is A method for charging raw materials for sintering, characterized in that the raw materials are cut onto an ore feed belt chute, and the charged raw materials are measured by a measuring device attached to the chute to perform quantitative cutting.