JPH05112835A - Manufacture of sintered ore - Google Patents

Abstract

PURPOSE:To prevent the collapse of granulated raw material before charging to a pallet and to improve the air passability and the sintering property by arranging a vibrating granulating machine to a cylindrical structure set in an ore supplying and giving the sintering raw material the exciting force to execute pseudo-granulation. CONSTITUTION:The charging raw material drop-supplied from a 18 in an ore supplying device through a drum feeder 19 is continuously supplied on the pallet 16 in the sintering machine through plural cylindrical or semi-cylindrical granulating machine 20 to continuously form the raw material layer. The vibrator 20b is connected with this granulating machine 20 and 3-10g of the exciting force is given to execute the pseudo-granulation to the raw material discharged from a gate. As the granulated grains are charged into the pallet 16 as it is, these grains form the sintered layer as it is. Therefore, the air passability is improved and the sintering property is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing sinter, and more specifically, the sinter is generally granulated by a drum mixer and then charged through a belt conveyor, a feed hopper, etc. The present invention relates to a method for producing a sinter that is charged on a pallet of a sinter machine via a grate.

[0002]

2. Description of the Related Art As a method for granulating sinter, there is, for example, the method proposed in Japanese Patent Publication No. 43-6256. This method is, for example, a method in which raw materials are ground with a ball mill, rod mill or other moisturizing grinder, water content is adjusted, and kneading is performed, and then raw pellets are granulated with a vertical or cylindrical granulator. Is.

According to this method, other raw materials can be mixed and granulated by the drum mixer, but at this time, the similar particles are disintegrated, and only particles having the same degree as the raw material particles passed through the drum mixer can be obtained. I can't. In addition, there is a problem that the particles collapse during the transportation, and the similar particles collapse in the belt transfer section and the feed hopper after granulation.

However, it is considered that it is unavoidable that colloidal particles after granulation collapse in the course of transportation, and as a countermeasure therefor, most of them are considered in addition to the measures for suppressing the amount of collapse due to the reduction of the B and C junction heads. It has not been.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems. Specifically, the raw material is cut out from a drum feeder and granulated by a granulator provided immediately below the granulator immediately before charging. However, it is an object of the present invention to propose a method for producing a sintered ore that does not cause collapse or the like.

[0006]

That is, according to the present invention, when manufacturing a sintered ore, a large number of cylindrical or half-cylindrical structures are arranged in parallel on a feed ore sew of a sintering machine. At the same time, a vibrating granulator that gives circular vibration to this structure is provided, and then a vibrating force of 3 to 10 g (g is the acceleration of gravity) is applied to the sintering raw material cut out from the feed hopper of the sintering machine. It is characterized in that the particles are given to make them into similar particles, and that the similar particles are directly or via a shoe charged on a pallet.

[0007]

The present invention will be described in detail below with reference to the drawings.
It is as follows.

FIG. 1 is a layout view showing an entire flow used when carrying out the present invention, FIG. 2 is an explanatory view of an outline of a mining section, and FIG. 3 is a view showing a granulation raw material from a discharge end. It is explanatory drawing of the situation which discharges, FIG.4 (a), (b) and (c)
FIG. 3 is a perspective view showing an example of the embodiment of the granulator of FIG. 2 respectively. Reference numeral 1 is iron ore, 2 is limestone, and 3 is a mill scale.
4, 4 converter slag, 5 electric furnace slag, 6 secondary raw slag, 7 return ore, 8 quicklime, 9 raw material, 10 raw coke, 11 compounded raw material, 12 primary mixer -, 13 are secondary mixers,
14 is a charging raw material, 15 is a sintering machine, 16 is a pallet, 17
Is a ore feeder, 18 is a hopper, 19 is a drum feeder, 20 is a granulator, 20a is a sloping shoe, 2
0b is a vibrator, 20c is a cut-off gate, 21 is a raw material layer, 22 is a wind box, 23 is an exhaust air branch pipe, 24 is an exhaust duct, 25 is a main blower, 30 is a fine iron ore tank, and 35 is a sintering raw material. , 36 indicates a bed ore.

In the sinter, a raw material such as iron ore and limestone is mixed with a powder coke which is a heat source in a drum mixer, and water is added to granulate the raw material, which is placed on a DL type sintering machine (pallet). It is manufactured by charging to form a raw material layer, igniting in an ignition furnace and sucking air downward while gradually guiding combustion of powder coke from the upper layer to the lower layer.

The raw material mixing and granulating step in the above sinter production process is, as shown in FIG. 1, iron ore 1, limestone 2, mill scale 3, converter slag 4, electric furnace slag 5, auxiliary raw slag. 6, a raw material 9 composed of return ore 7 (which may also be mixed with quick lime 8 as a binder) and a powdered coke 10 as a heat source are added to a mixed raw material 11 for a primary and secondary drum mixer. 12 and 13 are mixed and granulated to obtain a sintering machine charging raw material 14.

The charging raw material 14 is supplied to the pallet 16 of the DL sintering machine 15 from the hopper 18 of the ore feeder 17 through a drum feeder 19 or a belt feeder (not shown). The charging raw material 14 supplied by dropping is granulated by the granulator 20.
The raw material layer 21 having a predetermined thickness is continuously formed on the pallet 16 by continuously supplying the raw material layer 21 onto the pallet 16 via the sintering machine. The raw material layer 21 is an ignition furnace downstream of the raw material supply device 17 while air is sucked downward by a wind box 22 group, an exhaust air branch pipe 23 group, an exhaust gas exhaust duct 24, and a main blower 25 provided under the pallet 16. It is ignited at 26, and the combustion of the powder coke in the raw material layer 21 is gradually guided from the upper layer to the lower layer and fired.

Further, as shown in FIG. 2, the granulating machine 20 receives the raw material cut out from the drum feeder 19 and operates the granulating machine 20 immediately below to cut out the granulating material. The granulating machine 20 is composed of a cylindrical or half-cylindrical one, and the granulated raw material discharged from the discharge end thereof is concentrated from each granulating portion as shown by the arrow in FIG.

Therefore, the sloping shoe is attached to the discharge end.
By arranging the toe 20a, the width can be widened as indicated by the arrow, and thus the pallet can be mounted on the pallet in a state in which the variation in the width direction is reduced.

The basic principle of the granulator 20 is that, for example, a vibrator 20b (vibrator) is connected to a cylindrical granulator 20 (shoot) and a vibration acceleration is applied to the granulator 20 to disconnect it from the gate. This is what gives the granulation of the raw material delivered.

Here, as a result of the circular vibration of the raw material being imparted to the inside of the shoot, so-called nuclear granulation in which the fine particles adhere to the surface of the coarse particles is achieved, and the coarse particles are at least the binder.
Grain growth is achieved by utilizing The raw material that has been subjected to this treatment is immediately loaded onto the pallet 16, and as a result, it is possible to improve the air permeability and improve the productivity.

With the cylindrical granulator 20 (shoot), a part of the cylinder is cut off in FIG. 4 (a), and one side is configured as a raw material receiving side. Further, FIG. 4 (b) shows an example in which an integral type receiving portion is formed on one side of a cylinder which is partially lacking, and FIG. 4 (c) shows a part of the notch on the other discharge side. This is an example of a cylinder.

In FIGS. 4A and 4B,
Although the discharged state of the raw material can be observed, the raw material may leak from the notch if adhesion or the like occurs. In Fig. 4 (c), the observation part is limited to a part of the raw material inlet side and the other part is a cylinder to prevent leakage. Is intended. If the material vibrates in the left-right direction or circular vibration, the raw material moves along the inner wall of the cylinder and does not fly off even if it has a notch.

The granulator 20 may be integrated with the width direction of the pallet 16 or may be of a divided type. In this case, however, the amount of raw materials between the granulators is reduced, In order to prevent this, it is better to use an auxiliary shoe under the granulator. Excitation force (acceleration is 3-10
The area of g) seems to be good. The reason for this is that the strength of the granulated particles can be improved by applying a large excitation force, but if it is too strong, it will collapse due to the excitation in the middle, so this range was made.

Since the particles granulated here are charged into the pallet 16 as they are, the particles form a sintered layer as they are, so that the air permeability is good and the sinterability can be improved. is there.

[0020]

EXAMPLE The mimetic particles were prepared using an apparatus as shown in FIGS. Table 1 shows the results of comparison with the conventional method for comparison.

[0021]

[Table 1]

[0022]

As described above in detail, according to the present invention, when a sintered ore is manufactured, a large number of cylindrical or half-cylindrical structures are arranged in parallel on a feed ore shoot of a sintering machine. Along with the arrangement, a vibration granulator that gives circular vibration to this structure is installed,
Then, a vibrating force of 3 to 10 g (g is the acceleration of gravity) is applied to the sintering raw material cut out from the ore feeding hopper of the sintering machine to make the particles similar to each other, and the similar particles are directly or directly generated. It is characterized in that it is loaded on a pallet via a shoot.

Therefore, according to the present invention, since the granulation is carried out in the ore feeding section of the sintering machine and the pellets are directly charged into the pallet by the vibrating granulator capable of high speed granulation, the air permeability is good and the sintering is carried out. You can improve your sex.

[Brief description of drawings]

FIG. 1 is an overall flow chart used in carrying out the present invention.
FIG.

FIG. 2 is an explanatory diagram of an outline of a mining section.

FIG. 3 is an explanatory diagram of a situation in which a granulation raw material is discharged from a discharge end.

4 (a), (b) and (c) are respectively FIG.
It is a perspective view which shows an example of the Example of the granulator of this.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron ore 2 Limestone 3 Mill scale 4 Converter slag 5 Electric furnace slag 6 Sub-raw slag 7 Return mine 8 Quick lime 9 Raw material 10 Powder coke 11 Blend raw material 12 Primary mixer 13 Secondary mixer 14 Raw material 15 Sintering machine 16 Pallet 17 Mining device 18 Mining hopper 19 Drum feeder 20 Granulator 20a Sloping shot 20b Vibratory machine 20c Cutoff gate 21 Raw material layer 22 Windbox 23 Exhaust air blower 24 Discharge Duct 25 Main blower 30 Fine iron ore tank 35 Sintering raw material 36 Floor ore

[Procedure amendment]

[Submission date] October 12, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a layout diagram showing an overall flow used when implementing the present invention.

FIG. 2 is an explanatory diagram of an outline of a mining section.

FIG. 3 is an explanatory diagram of a situation where a granulation raw material is discharged from a discharge end.

FIG. 4 is a perspective view showing an example of an embodiment of the granulator of FIG.

5 is a perspective view showing an example of another embodiment of FIG. 2. FIG.

FIG. 6 is a perspective view showing an example of another embodiment of FIG.

[Explanation of symbols] 1 iron ore 2 limestone 3 mil scale 4 converter slag 5 electric furnace slag 6 auxiliary raw slag 7 reclaimed lime 8 quicklime 9 raw material 10 powder coke 11 blended raw material 12 primary mixer 13 secondary mixer 14 charging raw material 15 Sintering machine 16 Pallet 17 Mining equipment 18 Mining hopper 19 Drum feeder 20 Granulator 20a Sloping chute 20b Vibratory machine 20c Cut-off gate 21 Raw material layer 22 Windbox 23 Exhaust support 24 Exhaust duct 25 Main blower 30 Fine powder Iron ore tank 35 Sintering raw material 36 Floor mat

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

Claims (1)

[Claims] 1. When manufacturing a sintered ore, a large number of cylindrical or half-cylindrical structures are arranged in parallel on a feed ore shoot of a sintering machine, and circular vibration is applied to the structures. And a vibrating granulator for giving a vibrating granulator, and then applying a vibrating force of 3 to 10 g (g is the acceleration of gravity) to the sintering raw material cut out from the feed hopper of the sintering machine to achieve similar particles. A method for producing a sintered ore, which comprises charging the similar particles directly or via a shoe onto a pallet.