JPH0810117B2 - Sintering ore feeding method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sinter ore feeding method, and more particularly, to a sinter ore feeding method for forming a raw material charging layer suitable for operation on a pallet.

[Conventional technology]

Generally, in order to make the quality of the sinter ore in the height direction of the sintered bed layer uniform, improve the air permeability of the charging layer and improve the lump retention, the raw materials to be charged into the pallet should be loaded from various experimental results. Has a fine grain size and a large amount of coke distribution in the upper layer,
In the lower layer, segregation charging that coarse particles are distributed with a small amount of coke, and a belt chute or an iron plate chute that receives falling compounded materials midway and guides them downward is provided to reduce the charging height of the material. It is said that a method of lowering the charge density to achieve low density is preferable, but as a concrete measure for this, the following means have been proposed.

(A) Means for low-density charging by blowing air from the direction perpendicular to the trajectory of the raw material while it is falling (Actual development Sho 49
-19005).

(B) Roller chute means
Four).

(C) Means by screen bar chute (Actual exploitation 49-
39805).

(D) Means by screen chute (Actual exploitation 51-5810
3).

(E) Means using an iron plate chute.

(F) Means by belt chute (Jitsuko Sho 58-2944)
0).

As shown in FIG. 7, the means (f) comprises a feed hopper 1, a drum feeder 2, a belt chute 3, a pallet 4, a sprocket 5, a layer thickness adjusting device 6, and a raw material 7. The belt chute 3 is arranged below the drum feeder 2 so as to block the raw material falling path and to be steeply inclined with respect to the surface of the pallet 4, and the transfer direction of the belt 8 is opposite to the raw material falling direction.

[Problems to be solved by the invention]

Various means as described above have been proposed in order to make the quality of the sinter ore uniform, improve the air permeability of the charging layer, and improve the lump retention. However, the above-mentioned conventional technique has the following problems. That is, the means for spraying air in (a) has a large amount of attached water, which makes it difficult to separate fine particles from coarse particles due to agglomeration of particles and thus has a low segregation charging effect. Both the means with the screen bar chute of (c) and the means with the screen chute of (d) have a low segregation charging effect because the raw material is clogged at the slit portion and it becomes difficult to sieve the raw material. It takes a lot of time to perform maintenance work such as removal of raw materials and measures for screen abrasion. Further, in the means (e) using the iron plate chute, the chute is installed at an angle of the repose angle (50 ° to 60 °) or more of the raw material in order to prevent the raw material from being deposited on the chute. The segregation effect is low because the effect of lowering the falling speed due to the reduction is small and the charging density is high, and the shoot length is short and the rolling distance of the raw material necessary for particle size segregation is not sufficient. The belt chute means (f) has the belt chute 3 steeply inclined with respect to the surface of the pallet 4 because the transfer direction of the belt 8 is opposite to the falling direction of the raw material 7 as shown in FIG. Although it is effective in eliminating the inconvenience associated with the above, the drop impact is strong, and the same problem as the above-mentioned means (e) by the iron plate chute remains.

The present invention solves the above-mentioned problems and provides a sintering ore feeding method capable of ideally charging raw materials onto a pallet.

[Means for solving problems]

The present invention aims to solve the above-mentioned problems of the prior art, and adopts the following method. That is, the first invention method is to quantitatively cut out the blended raw material from the feed hopper, transport it on the elastic net of the classifier, and give the elastic net a periodic tension and relaxation state to vibrate the blended raw material to make it elastic. Grain size segregation is generated in the vertical direction of the raw material layer on the net, and the raw material on the upper part of the net is first fed onto the pallet, and the raw material on the lower part of the net is stacked on the pallet. This is a method of stacking coarse particles on the lower layer and fine particles on the upper layer. Further, in addition to the method of the first invention, the second method of the invention is a method in which the powder coke separately cut out from the powder coke hopper is uniformly loaded on the surface of the raw material loaded on the pallet.

[Action]

The point of the idea of the present invention is that the elastic network has periodic tension,
By imparting a relaxation state and applying vibration to the blended raw material,
The mixed raw materials on the elastic mesh are finely divided in the lower layer, and coarse particles and particle size are generated in the upper layer. Grains and fine grains are formed in order on the upper part of the layer.

The elastic net used in the present invention is, for example, a net made of a highly elastic material such as a rubber net that can be repeatedly tensioned and relaxed. This elastic net is stretched on two movable frames provided along the direction of movement of the raw material, and when both frames are reciprocally moved in opposite phases in the forward and backward directions of the raw material, the elastic net is relaxed and relaxed. The raw material on the elastic mesh is repeatedly subjected to vertical movement, and the raw material undergoes particle size segregation while being subjected to particle size classification.

When the elastic net is changed from the relaxed state to the tensioned state, the raw material is jumped upward with an acceleration of about 30 G, so that the raw material is dispersed and the large particle size is upward, and the small particle size is downward. Effective particle size segregation and particle size classification can be performed while receiving a stratification effect.

By feeding the raw material onto the pallet while segregating and classifying the particle size, the material transfer direction on the elastic mesh is opposite to the material transfer direction of the pallet, and the smaller the particle size, the faster the material is supplied onto the pallet. Due to the difference in the feeding time on the pallet depending on the particle size of the raw material, it is possible to stack coarse particles in the lower layer portion and fine particles in the upper layer portion on the pallet.

Furthermore, if the powdered coke cut out quantitatively from the powdered coke hopper provided separately from the feed hopper is charged into the most upstream part of the elastic net prior to the compounding raw material, it is loaded on the pallet by the sieving action of the elastic net. The coke powder can be evenly stacked on the surface of the raw material. In this case, the powdered coke may be excluded from the coke added to the raw material in advance, and the coke basic unit can be reduced by improving the ignitability of the powdered coke and improving the flammability by charging the coke at the top of the pallet. You can

〔Example〕

Hereinafter, the details of the method of the present invention will be described with reference to the drawings. First
The figure is an explanatory view of a sintering ore feeding apparatus capable of suitably carrying out the method of the present invention. In the present invention, a rubber net 15 having a mesh of 3 mm was used as the elastic net, and a powder coke 12 having a diameter of 2 mm or less was used.

The ore feeder comprises a belt feeder 10 arranged directly below the ore feeder hopper 1, a powder coke hopper 11, a rotary valve 13 and a sieving machine 14 provided directly below the powder coke hopper 11. 2 and 3 show the sieving machine 14, the rubber net 15 is attached to the movable frames 16 and 17 by the holding plate 18, and one end of the movable frames 16 and 17 is
It is attached to the rotary plate 20 via the pin 21 and the connecting rod 19 at a position shifted in phase by 180 °. In addition, the rotating plate
20 is a chain 22 via a sprocket 23, a motor 24
It is connected to.

The sieving machine 14 is fixed on a pedestal 27, and a side plate 25 is provided to prevent the raw material 7 from scattering. 26 indicates a shot.

Next, the method of the present invention will be described. As shown in FIG. 1, the belt material is directly below the compounded raw material 7 in the feed hopper 1.
When the raw material 7 undergoes particle size segregation and particle size classification when it is cut out quantitatively by 10 and charged into the sieving machine 14, its operation will be described with reference to FIGS. 2 and 5. Rubber net of sieving machine 14
Reference numeral 15 is stretched over movable frames 16 and 17, and the movable frames 16 and 17 are attached to a rotary plate 20 via a connecting rod 19 with a phase shift of 180 °. Rotating plate 20 by motor 24
When is rotated, the two connecting rods 19 reciprocate in opposite phases to each other, so that the movable frames 16 and 17 move inward in the section as shown in FIG.
On the contrary, the rubber net 15 stretched on the movable frames 16 and 17 is relaxed in the section and is tensioned in the section because the rubber mesh 15 stretched on the movable frames 16 and 17 is moved outward. In the next cycle, the section relaxes and the section becomes tense, and these are alternately repeated, and the raw material 7 is a raw material larger than the mesh of the rubber net 15 that does not pass through the rubber net 15 while undergoing particle size segregation and particle size classification. Are sequentially transferred downward. Further, the sieving machine 14 is arranged so that the feeding direction of the charging raw material 7 on the sieving machine 14 is opposite to the conveying direction of the pallet 4, and the pallet 4 of the raw material transferred on the rubber net 15 is arranged. Raw material 7 with a smaller particle size is supplied faster, and raw material 7 with a larger particle size
The raw material 7 which becomes slower and has a larger grain size is supplied to the lower layer portion of the pallet 4. Therefore, coarse particles are added to the lower layer of the pallet 4,
Fine grains can be stacked on the upper layer.

Furthermore, the diameter of the powder coke hopper 11 provided separately is 2 mm.
The following powder coke 12 is cut out in a fixed amount by a rotary valve 13 immediately below, and charged into a rubber net 15 at the uppermost grain portion of a sieving machine 14 before the raw materials are mixed. As a result, pallet 4
The powder coke 12 having a size of 2 mm or less can be uniformly loaded on the uppermost layer of the raw material 7 loaded on the pallet 4, and finally the ideal raw material charging shown in FIG. 4 is achieved on the pallet 4. .

〔The invention's effect〕

The sintering ore feeding method of the present invention has the following excellent effects.

(1) Since it is possible to surely charge the raw material ideal for the sintering operation, the quality of the sintered ore in the height direction of the sintered layer is made uniform, the air permeability of the charged layer is improved, and the mass retention is improved. Improved,
It can be expected to reduce the basic unit of coke.

(2) Since tension and relaxation are given to the rubber net, the raw material is not attached to the rubber net, the deterioration of the classification effect due to clogging can be prevented, and the segregation charging can be surely performed. Furthermore, maintenance work is facilitated without the need to remove adhered powder.

[Brief description of drawings]

FIG. 1 is an explanatory view of a sintering ore feeding apparatus capable of suitably carrying out the method of the present invention, FIG. 2 is a perspective view of the sieving machine of FIG. 1, and FIG.
FIG. 4 is a view taken along the line AA in FIG. 4, FIG. 4 is an explanatory view of a loading state of raw materials loaded on a pallet by the method of the present invention, and FIG. 5 is an operation explanation of a rubber net and a movable frame in FIG. 6 and 6 are explanatory views of a conventional example. 1 ... Mining hopper, 2 ... Drum feeder 3 ... Belt chute, 4 ... Pallet 5 ... Sprocket, 6 ... Layer thickness adjusting device 7 ... Raw material, 8 ... Belt 10 ... Belt feeder 11 ... … Powder coke hopper 12 …… Powder coke 13 …… Rotary valve 14 …… Sieving machine, 15 …… Rubber net 16,17 …… Movable frame, 18 …… Holding plate 19 …… Connecting rod, 20 …… Rotating plate 21 ...... Pin, 22 …… Chain 23 …… Sprocket, 24 …… Motor 25 …… Side plate, 26 …… Shoot 27 …… Stand ,, …… Section

Claims (2)

[Claims] 1. In a sintering ore feeding method, the compounding raw material is quantitatively cut out from a ore feeding hopper, transferred on an elastic mesh of a classifier, and the elastic mesh is imparted with a periodic tension and relaxation state, whereby the compounding is carried out. The raw material is vibrated to cause particle size segregation in the vertical direction of the raw material layer on the elastic mesh, and the particle size is classified, the raw material on the upper part of the net is supplied on the pallet first, and the raw material on the lower part of the net is laminated on it. And a coarse grain in the lower layer on the pallet and a fine grain in the upper layer. 2. In the sintering ore feeding method, the compounding raw materials are quantitatively cut out from the ore feeding hopper and transferred on an elastic mesh of a classifier, and the elastic mesh is imparted with a periodic tension and relaxation state, whereby the compounding is carried out. The raw material is vibrated to cause particle size segregation in the vertical direction of the raw material layer on the elastic mesh, and the particle size is classified, the raw material on the upper part of the net is supplied on the pallet first, and the raw material on the lower part of the net is laminated on it. Coat the coarse particles in the lower layer on the pallet and the fine particles in the upper layer, and further, a certain amount of powdered coke cut out separately from the powder coke hopper is evenly distributed on the surface of the blended raw material stacked on the pallet. A method for sinter and ore feeding, characterized by: