JPH03219026A - Method and apparatus for pre-treating sintering raw material - Google Patents

Abstract

PURPOSE:To improve kneading effect and granulating effect of raw material by spraying mist stream on front surface and rear of powdery mixed raw material flow to add moisture and making it flaky shape with a kneading machine having plural columnar rods at the time of granulating the sintering raw material for blast furnace. CONSTITUTION:At the time of manufacturing the sintered ore as the raw material for blast furnace, the powdery mixed raw material 2 of powdery iron ore, returned ore, lime stone, slag making agent and coke, etc., is conveyed with a conveyor 1 and made to band-state of wide width with the width widening buffer means 4 for the raw material 2 arranged in proximity to an end roller 11 and charged to a kneader 3. In this case, the fine mist streams 8 having 50-200mum diameter with high pressure air by two mist stream blowing devices 5, 5 are blow to the mixed raw material 2 from the front surface and rear of the raw material flow and after adding the moisture, this is made to the flaky shape with the kneader 3 having plural columnar rods 35 and being excited with exciting roller 33. This is charged to a granulating machine to obtain a pellet-like sintering raw material having uniform composition, excellent strength, suitable grain size and excellent sinterability.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a pre-treatment method for sintering, and more specifically, for example, the sintering raw material to be supplied to a DL type sintering machine, powdered iron ore, etc. When stone, return ore, limestone and other slag-forming agents, and coke and other reducing agents are kneaded in advance to a high density and then granulated into lumps, water is uniformly added to the sintering raw material, which improves the kneading effect and The present invention relates to a pretreatment method that greatly improves the granulation effect.

Conventional technology For example, in conventional DI-type sintering operation, various types of paddy stored in a sintering raw material mixing tank such as a hopper are transferred between rows on bell I and conveyor N' in fixed m increments. They are stacked and cut out, and then, for example, 4 to 5% of water is added to the mill, and the sintering raw materials are kneaded and granulated, and this granulated material is
A bullet is loaded into the L-type sintering machine, and while the bullet is advancing, it is ignited with an ignition burner and C sintering is performed. In the sintering operation, fine iron ore containing 60% or more of particles with a particle size of less than 60 μm is used as the sintering raw material.
It is preferable that as many (as many) fine f5) iron ore colors as possible be blended. However, fine iron ore with such fine particle size is 100% of the sintered raw ore. .

If the amount exceeds this amount, the air permeability of the sintered bed will be hindered, and productivity will be greatly reduced. In addition, in order to improve air permeability, 1 tr of quicklime and 4 liters of slaked lime are added.
It's good that the price has soared: i L <!;stomach.

From this point of view, various pre-processing methods are available! ! However, these methods have the following problems, and it is desired to improve them.

60% fine iron ore containing 60% or more of grain size 60 μl (3Q% is mixed with about 40% of return ore or iron ore 6 as the rough stone that will become the j-11, -C5 core, and this is Donomume 1mm 1 amount 1yo or f The nucleus iTh grain h fh is iron and 14: vol, 71. Ni1Of19851'
"Pelletization of sintering raw materials and its role" is described. However, in this method, the core door 11 must be mixed with iron ore in the same proportion as 8 East C1, and the capacity must be C4 (ES large Me H + 1 is required, equipment) The disadvantage is that it is expensive.

Also, normal V? , Kuharatoshi, for example, 60 bags of powdered ore?
. A large amount of fine iron ore (40 weight mm) is blended into the mixture, and this is kneaded and granulated using a disc-shaped beretiller to form a C diameter of 5-10 mm.
The method of making a mm pellet and then sprinkling fine coke on the outer periphery of the pellet as exterior coke is
@: vol, 73. & lN19871f Basic research on manufacturing conditions and quality plan for new agglomerated ore for blast furnaces. However, the pellets formed by this method, ie, green balls, have a small degree of crushing and a low crushing strength. For this reason, C1 tends to be destroyed while being sent to the bullet, and the air permeability of the sintered bed is greatly inhibited. In addition, if the average particle size of the product with coke on the outer periphery is as large as 8 to 10 mm, and an outer carbon is required, and if the outer coke is not distributed evenly on the outer periphery of the pellet, the internal It has the disadvantage that it is unmelted and tends to become pellets during the crushing process.

Therefore, the present inventors first added moisture to the sintered raw stone and kneaded it at high density to form a flake while applying vibration in a drum-type kneading machine, and then We proposed a method in which this material is granulated using a drum-type granulator while applying vibration. According to this method, a relatively large amount of fine iron ore can be blended, and it is also possible to granulate the granules with a desired particle size of C1, which is strong, and with high productivity. However, in this method, water is added to the sintered rough stone in the drum-shaped kneading pit, so it is extremely difficult to add water uniformly, and the amount of water added must be greater than 9. In addition to reducing the yield/f of pellets of appropriate particle size, the strength of the granulated pellets decreases and the sinterability deteriorates.

Problems to be Solved by the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, and specifically, for example, sintered raw stone, fine iron ore, return ore, limestone: f: etc., which are supplied to a DL type sintering machine. slag-forming agent,] alcoholic acid and other;! Mixing the base material with a cylindrical rod If vibrationally recirculates it!
The mixed N
i Add water to the sintered raw material in a spray state before charging it to the rock, and add it uniformly to the sintered raw stone to improve the kneading effect! I! In addition, we propose a pretreatment method and device that greatly improves the granulation effect.

Means for Solving the Problems and Their Effects The method of the present invention is characterized in that, prior to sintering in a sintering machine, a sintering material is moved through a mixed atomizer in which a cylindrical rod vibrates in a circular motion.
After the sintered raw materials are continuously charged into the granulator and kneaded to a high density to form flakes, they are transferred to the granulator and granulated into lumps. Prior to -[, the surface and back surface of the sintered raw material stream supplied to the kneading machine were sprayed with high-pressure air C water. vI sign.

A device suitable for carrying out this method is a cylindrical vibratingly moving cylindrical kneader (IVI material charging inlet and A widening buffer means is provided between the feed conveyor that continuously sends the sintering raw material to the m machine, and the sintering raw material released from the tip of the conveyor X collides with it and spreads it into a thin and wide belt. A mist flow blowing device is installed between this widening buff means and the raw material charging port to spray water with high pressure air to form a mist flow. shall be.

Now, the functions of these means will be explained in detail with reference to the drawings as follows.

In addition, FIG. 1 is a front view showing a cross section of a part of an example 44) suitable for carrying out the method of the present invention, and FIG.
This is a cross-sectional view from the direction of arrow A-8 in the figure, and FIG. 3 is for mist flow jetting from the direction of arrow B-875 in FIG. ! This is an explanatory diagram of an example of Mr. J, and FIG.
FIG. 4 is a front view of the mist flow blowing device, and FIG. 5 is an explanatory diagram of an example of the mist flow forming unit.

First, in FIG. 1, the feed competition N indicated by the symbol 1
] Sintered IJ on top? 1 ingredients 2 are placed on top and continuously sent to the kneading machine 3 to mix IQ! Machine 3C sintering material! No. 12 is kneaded uniformly with high density to form flakes. A width widening buffer means 4 is provided in the vicinity of the tip roller 11 of the container It is expanded into a band. The front or back surface of the sintered Wt 2 spread out in a band shape is continuously charged into the mixing II machine 3 while a mist flow is blown off as described below.

This mixed HR 3 mixes the charged sintering raw material 2 at high density, expels the intervening air, and turns it into flakes. A preferred kneading machine 3 is as shown in FIG.
The support frame 31, which was previously proposed by the present inventors,
It consists of a drum-shaped can body 32, vibrating ports 33 on both sides, and a hopper 34 into which the sintering raw material is charged. That is, a large number of cylindrical rods 35 are interposed within the tram Akita body 32, while the drum-shaped can body 32 is supported by a support frame 31, and on both sides of the support frame 31 there are eccentric shafts O and C. A rotating vibration roller 33 is provided, and the support frame 3
1 is elastically supported by a spring 36. Follow me
C1 In this model of >Ti 11 machine 3, when the vibration rollers 33 on both sides rotate C around the eccentric axis 0, the support frame 31
At the same time, the drum-shaped can body 32 vibrates from top to bottom and from side to side, and a large number of cylindrical rods 35 inside vibrate and rotate, and the C sintered L9 stone 2 is kneaded using this as a medium to form a flaring shape.

Further, the width-expanding buffing stage F 4 is for spreading the colliding sintering raw material 2 thinly and widening it, and as shown in FIG. It consists of a plate 4), a support frame 42, and a support frame 4
2 is rotatably supported at the tip of the support arm 43 as shown in FIG. 1, and the sintering L'? The collision angle with respect to 1142 can be adjusted. As shown in Fig. 2, the buff 1 plate 4) protrudes in a mountain shape at the center in the width direction, and the sintering raw material 2 hits this central protrusion, flows from C to both sides, and expands its width. A thin strip-shaped raw material stream can be formed.

Therefore, in the pre-processing device configured in this way,
Before entering the kneading machine 3, between the feed conveyor 1 and the kneading machine 3, water is atomized with air and blown into the sintering raw material 2 in the form of a mist. Between widening buffing f stage 4 and widening buffing f stage 4 and mixed F
A mist flow spraying device M5 is installed between the JW3 and the mist flow spraying device [5]. This is for spraying onto the sintering raw material 2. Mist flow blower A/1 unit H5
If this purpose can be achieved, the configuration C can be completed, but it can be configured by incorporating the singing nozzle shown in Fig. 4 and (formerly) into the mist flow forming chamber shown in Fig. 5. The nozzle shown in FIG.
An annular water passage 'tlIJ52 is formed around the .

These inner passages 51 and 52 merge and mix at their tips, and a nozzle depth 54 is provided at the tip of this merge mixing section 53.
There is C. While high-pressure air is injected from the direction of the arrow C through the pressure air passage 51, water sent from the water passage 52 around -C by this high-pressure air flows into the merging and mixing section 53 at the tip (-spray mixing and mist flow 8). is formed and is injected from the nozzle tip 54. When the mist stream is flattened and is injected, the injection hole 55 at the tip of the nozzle tip 54 is configured with a biased ITz hole closure C as shown in FIG. As shown in Fig. 3, the mist flow blows over the entire width of the widely spread flow of the sintering raw material 2. To explain this in more detail, Fig. 3 Cn No. 81r shows the mist flow 8. The mist flow is sprayed so that these spray patterns 81 are continuous, for example, the sintering raw material 2
The entire width of the surface is blown and wetted.

The mist flow blowing device 5 having a nozzle with this structure is one
Two or more can be provided as desired (Example C shown in Figure 1 is 2'
Although it is possible to individually incorporate nozzles into the mist flow forming line, normally the mist flow forming line is shared as shown in Figure 1. , if multiple nozzles are not installed in the
can. The sui j straw and mist flow forming line is made by branching the air line equipped with soil affilter 61, Ii & juice 5t62 into multiple parts, and adding a speed fan i to each branched air line.
A line 763 and a cutoff 'n64 are provided, and the high-pressure air passage 51 (see Fig. 4 (al)) of each nozzle is connected to the Ctk end.In addition, a strainer 65, a cutoff valve 66, and a flow cutoff 67 are provided in this line. , water mold control m+V with flow adjustment t?68
A device IO is provided, and this hole line is branched at the tip, and each branch main line is connected to the water flow fg of each nozzle via a shutoff valve 66.
52 (see FIG. 4 tal), respectively.

As described above, when the mist flow 8 is sprayed onto the front or back surface or both the front and back surfaces of the sintered raw material 2 that has been introduced from the feed conveyor 1 or has been thinned by widening on the way, the sintered raw material 2 is thinned (in the form of a wide band). Since the water tends to be spread out and supplied as a finely dispersed spray, the entire sintered material is uniformly impregnated with the appropriate amount of water.

In other words, sintering raw material 2 to which an appropriate amount of water is uniformly added
'c, the surface of each raw material particle is covered with a uniform water film, and when kneaded in this state by the cylindrical rod 35 interlocking with the C circle in the RII R3, the particles are mixed uniformly and become sticky and excessive. A flaky product with no fluidity is obtained. If it is flaked in this way, it is then granulated using, for example, a drum-type granulator (f not shown), and the dovetails become belens with a diameter of 2-bmm and a culm of 1-1. Δ
The particles are finely grained and each pellet is strong and will not break even in the flash of C1 sintering operation.<Breathability is not impaired.

To explain this in more detail, if excess moisture is added to the sintering raw material, the sintering raw material will become more fluid, and if there is insufficient moisture added, the granulation properties in the granulator will be impaired. The breaking strength of the green ball is reduced and the sinterability is impaired. For this reason, when kneading prior to granulation, an appropriate amount of moisture is added to the kneader, and this moisture is uniformly absorbed by 5f, so that the surface of each raw material particle of the sintered raw material is uniformly distributed over the entire surface. It is extremely important that it stays wet. This car,
When using a kneading machine in which the cylindrical [1] rod vibrates in a circular motion and adding water directly into the mixer as in the conventional example, the mixing I$! Although it depends on the structure of the machine, it is not possible to increase the water pressure when adding this water, making it difficult to uniformly add excess water, resulting in the formation of dense and dense sections in the water in the sintering raw material.

In 7.1, when water is added at the front stage of the N mixer as described above, the water can be added in a TJnn state using air, and an appropriate amount of water can be uniformly added.

It is preferable that the water particles have a diameter of 50 to 200 μm, for example, and within this range, an appropriate amount of moisture can be added and impregnated into the entire particle.

(Effects of the Invention) As explained in detail above, the present invention provides a method for pre-treating a sintering raw material and its g-position, in particular a cylindrical rond vibrating the sintered M raw material prior to the sintering operation. After continuously charging the mixture into a mixing machine that moves in a circular motion and kneading it to a high density to form flakes, it is charged into a granulator and granulated into lumps. It is characterized by spraying a mist stream of water using high-pressure air onto the surface and/or back surface of the sintered raw material to remove moisture.

Therefore, as long as an appropriate amount of water can be uniformly added to the sintering raw material, pellets with mostly appropriate particle sizes can be obtained in the granulator. In addition, each of the obtained berets is hard and has high strength, and even during sintering, air permeability is sufficiently maintained, and sinterability is improved.

[Brief explanation of drawings]

FIG. 1 is a front view showing part of an example of an apparatus suitable for carrying out the method of the present invention, and FIG. 142 is a view taken along arrow A-A in FIG.
A cross-sectional view along the line, FIG.
4(I)) is a side view showing an example of the mist spraying device, and FIG. 4(I) is a front view of the mist spraying device.
The figure is an explanatory diagram of an example of a mist flow forming urn. Code 1...Feeding competition ip 2...Sintering raw material 3...Kneading machine 4...Broadening buffer means 5...Mist flow blowing f=J device 8...Mist flow 35...Cylindrical Rondo 33...Vibrating roller

Claims (1)

[Claims] 1) Prior to sintering in a sintering machine, the sintering raw material is continuously charged into a kneading machine in which a cylindrical rod vibrates in circular motion, and the sintering raw material is kneaded at high density. After turning into flakes,
When this is charged into a granulator and granulated into lumps, high-pressure air is applied to the front and/or back surface of the sintered raw material flow supplied to the kneader before charging into the kneader. A method for pre-processing sintering raw materials, characterized by adding water by spraying a mist stream of water. 2) The method for pre-processing a sintering raw material according to claim 1, characterized in that after the sintering raw material stream is spread thinly and wide, water is added by spraying the mist onto at least the surface. 3) The method for pre-processing a sintering raw material according to claim 1 or 2, characterized in that the diameter of water droplets in the mist is set to 50 to 200 μm. 4) A raw material inlet of a kneader that kneads the sintered raw material into flakes at high density using a cylindrical rod that vibrates in a circular motion, and a feed conveyor that continuously feeds the sintered raw material to this kneader. In between, a widening buffer means is provided in which the sintered raw material released from the tip of the feed conveyor collides and is spread out into a thin and wide band, while a high pressure A pre-processing device for sintering raw materials, comprising a mist spraying device that sprays water with air to form a mist stream. 5) A pre-processing device for sintering raw materials, characterized in that the mist flow blowing device is provided between the feed conveyor and the widening buffer means.