JPS58174276A - Apparatus for classifying sintering coke powder - 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 The present invention relates to an apparatus for classifying coke powder for sintering, and particularly aims to provide an apparatus capable of classifying coke for sintering without using a sieve or the like.

The raw materials for sintering are mainly composed of fine ore, coke powder as a fuel, and limestone powder as a slag component.These three raw material powders are properly mixed in a mixer before being charged to the pallet of the sintering machine. The mixture is mixed while adding a certain amount of water (usually about 5%). By the way, the particle size of fine ore and coke powder are generally α1~5 m11 and 0.05~5 m11, respectively.
It is about 5 IIm. Therefore, as shown in Figure 1 (A), the fine powder 2 of 0.311 m or less in the raw material is granulated by adhering to particles 1 in the range of 1 to 3 mm in the raw material. In the granulation method, Figure 1 (B
), the proportion of core particles that become coke powder during granulation is large due to the particle size structure of coke powder, and the particle size of particles granulated in this way (hereinafter referred to as pseudo particles) is large. Since the large coke 1a is surrounded by the outer coke powder 2b and the small coke powder 1b, it does not come into contact with the combustion air during sintering and is not completely combusted, so it cannot be used as a fuel. This has the disadvantage that the performance decreases, and therefore the amount of coke powder added as a fuel must be increased.

In order to overcome this drawback, as previously proposed by the present inventors (Japanese Patent Application No. 110390/1982), coke powder is divided into particle sizes using a kind of wind sieve, and then added to a mixing and granulating machine. There is.

The present invention relates to an improvement of the method proposed in the earlier application, in which after classifying coke powder for sintering raw material, fine-grained coke powder is mixed and granulated with ore powder, limestone powder, and water in advance, Next, the present invention relates to an apparatus for classifying coke powder when uniformly mixing coke powder with a large particle size into this mixture.

Previously, sieves were used to classify coke powder, but the sieves clogged, making it impossible to sieve properly.

Therefore, the present inventors conducted intensive research to develop a device that can classify coke powder without using a sieve, and found that coke powder should be mixed with fine ore and limestone powder. It was confirmed that the grains could be classified into a coarse grain group and a fine grain group based on differences in falling trajectories depending on particle size and differences in angle of repose depending on particle size.
Based on this knowledge, the present invention was completed.

That is, the present invention relates to a movable chute type coke powder distribution machine, and a coke powder distribution machine for sintering comprising two sets of tanks equipped with a movable deflector plate that changes the flow direction of coke powder from the distribution machine. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to drawings that provide an overview of the classification apparatus and show embodiments of the present invention.

Figure 2 shows an example of a coke powder classification device that utilizes the property that the kinetic energy during falling and the angle after falling vary depending on the coke particle size. 3 is a deflector blade whose position and angle can be changed, 4σ fine coke powder storage tank, 5 is a coarse coke powder storage tank, and 6 is a coarse coke powder storage tank. Granular coke powder, 7 is classified coarse coke powder, 8 is fine coke powder? A conveyor 9 conveys the coarse coke powder to the mixer. Note that S is a partition wall installed between tanks 4 and 5. Also, Fig. 3 shows a straight-body granulator as a mixing granulator using fine coke and coarse coke classified by the above classifier. This shows the mode of granulating the sintering raw material using a drum mixer of the type 10.
1 is a straight-body drum mixer, 11 is a tire in contact with the drive roll R for rotating the mixer, 12 is an inlet for raw materials for sintering, and 15 is an ore powder, limestone powder, and coke classified by the coke classifier shown in Figure 2. A conveyor conveys a raw material prepared by pre-mixing fine coke powder with a predetermined amount of moisture.
14 is a conveyor for transporting the coarse coke powder classified by the coke classifier shown in FIG. 2 to the mixer outlet section;
15 is an outlet for the raw materials for sintering after mixing and granulation, and 16 is a conveyor for conveying the raw materials to the sintering machine.

First, in FIG. 2, the coke powder raw material supplied via the movable chute type coke distributor 2 which can be moved in the width direction by the conveyor 1 collides with the entire surface of the deflector plate 3. During this collision, large grain size (coarse grain)
Since the coke powder has a large kinetic energy, it flies far after colliding with the deflector plate 3, while fine coke powder falls near the deflector plate 3. In addition, fine coke powder has a large angle of repose, so it stagnates near the deflector plate 3 and enters the tank 4. However, relatively coarse coke powder has a small angle of repose, so it stagnates near the deflector plate 3 and enters the tank 4. - The grains fall down and enter the tank 5 located far from the deflector plate 3. By doing this, it is possible to change the ratio of the amount of coke powder entering the tank 4 and the tank 5. Also, the height of the partition wall S of the tank 4 and tank 5 can be changed depending on the amount of coke powder after classification in the tank. It is also possible to control the ratio of coke powder classified into tanks 4 and 5 to always be constant by changing the height and setting it at 1 so that it rises. The raw material coke powder is classified into relatively fine grain groups and coarse grain groups, and is conveyed to predetermined positions in the mixer by conveyors 8 and 9, respectively. A mixture of fine coke powder classified by the classifier shown in FIG. 2 and a predetermined amount of water is continuously charged from the inlet side 12 of the drum mixer 10 through a conveyor 15 and a chute.

On the other hand, coarse coke powder classified by the classifier shown in FIG. 2 is supplied to a position near the outlet of the drum mixer 10 via the conveyor 14 shown in FIG.

As mentioned above, fine coke powder costs $1 at the mixer entrance! I
While moving through the mixer, the fine coke powder forms pseudo particles with the large ore powder 2a as a core, as shown in FIG. 1(C). Since the coarse coke powder 1a is fed and added near the outlet of the drum mixer 1o, it is difficult to generate susceptibility particles with the coarse coke powder as a core, and they exist in these coarse coke powder almost as they are. I will do it.

According to the apparatus of the present invention, since a sieve is not used, it is possible to efficiently classify logs without causing clogging, and in the case of the coke powder classification apparatus of the embodiment, 50 kg of logs can be classified per minute! Coke powder was charged and classified by adjusting the position and angle of the deflector blade so that the weight ratio of fine particles to coarse particles was about 1:1.

The drum mixer has an inner diameter of 45 m, a length of 15 m, an angle of inclination of 2°, and rotates at a speed of 7 revolutions per minute.
3.5 klm of fine coke powder was supplied, and 3.5 kq/mf of coarse coke powder was supplied near the drum mixer outlet. When the sintered raw materials mixed and granulated under these conditions were sintered using a sintering pot tester, a product yield of 75% was obtained (the total amount of coke powder added was 3%).

On the other hand, when the sintered raw material made into 4J' by the conventional mixed granulation method was sintered using the same sintering pot tester, about 36J' of coke was required to obtain the same product yield as the present invention. In other words, by using the apparatus of the present invention, the initial amount of coke used could be reduced from 36% to 50 g.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the granulation state of the sintering raw material.
A) is a diagram of its principle, FIG. 1 (CB) is a schematic diagram of a granulated product obtained by the conventional method, FIG. 1 (C) is a schematic diagram of a granulated product obtained using the apparatus of the present invention, and FIG. Figure 2 shows the classification device Q) of the present invention.
One embodiment is shown in Figure 3, and Figure 3 is a diagram showing an aspect in which coke powder classified by the apparatus of the present invention is used. A) Figure 1 (8)

Claims (1)

[Claims] A device for classifying coke powder for sintering, comprising a mobile chute type coke powder distributor and two sets of tanks equipped with a movable deflector grade that changes the flow direction of coke powder from the distributor.