JP5772066B2 - Steel making raw material sieving device and iron making raw material sieving device - Google Patents

Description

  The present invention relates to an iron making raw material sieving device and a method for charging an iron making raw material into a sieving device.

  Conventionally, when feeding granular iron-making raw materials (iron ore, lump ore, coal, coke, etc.) to a sieve device (vibrating sieve, swinging repulsive sorter, etc.), conveying equipment such as a conveyor and a vibrating feeder Is used to feed a steelmaking raw material (hereinafter also simply referred to as “raw material”) to the sieve surface of the sieve device.

  However, when the width of the sieving device (for example, vibrating sieve) is several times larger than the width of the transport facility (for example, belt conveyor), the raw material concentrates at the raw material charging point on the vibrating sieve surface, and the raw material is As it moves on the surface, it gradually diffuses in the width direction. For this reason, the area of the vibrating sieve is not effectively utilized from the raw material charging point on the vibrating sieve surface to the point where the raw material is sufficiently diffused in the width direction.

  Therefore, as a method of diffusing the raw material in the width direction and putting it on the vibrating sieve surface, a method described in Patent Document 1 is disclosed.

  That is, in Patent Document 1, a diffusion device having a plurality of barrier plates is provided between a conveyor and a vibration sieve, and the raw material is diffused in the width direction by feeding the raw material from the conveyor to the vibration sieve through the diffusion device. In this state, it is put into the sieve surface of the vibrating sieve.

JP-A-6-296894

  However, the technique disclosed in Patent Document 1 has the following problems.

  (A) Each time the raw material is put into the diffusion device, the raw material collides with the first barrier plate, so that the barrier plate is worn.

  (B) Even when the raw material passes through the flow path formed by the barrier plate, the flow path wall surface and the raw material rub against each other, and the flow path side surface wears.

  (C) When a highly adherent raw material such as containing moisture is introduced, there is a concern of blockage in the flow path.

  The present invention has been made in view of the above circumstances, and feeds iron-making raw materials (iron ore, lump ore, coal, coke, etc.) to a sieve device (vibrating sieve, swinging repulsive sorter, etc.). In order to provide an iron making raw material sieving apparatus and an iron making raw material sieving apparatus that can be introduced into the sieving surface in a state in which the iron making raw material is dispersed in the width direction without causing wear or blockage. It is the purpose.

  In order to solve the above problems, the present invention has the following features.

  [1] An iron making raw material sieving device, wherein a pile of the same iron making raw material as the iron making raw material to be input is formed on a diffusion member installed above the sieving surface, and on the slope of the iron making raw material mountain When the steelmaking raw material is fed toward the steelmaking raw material, the steelmaking raw material flows downward along the slope of the mountain of the steelmaking raw material and diffuses in the width direction of the sieve surface. apparatus.

  [2] A method of charging steelmaking raw material into a sieve device, wherein a pile of the same ironmaking raw material as the ironmaking raw material to be input is formed on a diffusion member installed above the sieve surface, and the pile of the ironmaking raw material is formed. Ironmaking raw material is introduced toward the slope of the steelmaking, and the steelmaking raw material is dropped downward along the slope of the mountain of the steelmaking raw material so that it is diffused in the width direction of the sieve surface. How to put raw materials into the sieve device.

  In the present invention, when iron-making raw materials (iron ore, lump ore, coal, coke, etc.) are put into a sieve device (vibrating sieve, swinging repulsive sorter, etc.), iron-making raw materials are not caused to cause wear or blockage. Can be introduced into the sieve surface in a state dispersed in the width direction.

  That is, the following effects can be obtained.

  (A) By spreading the iron-making raw material in the width direction and throwing it into the sieve surface, the area in the width direction can be used effectively from the raw material charging point on the sieve surface, and the sieving efficiency can be improved.

  (B) Since the steelmaking raw material is introduced into the pile of the ironmaking raw material and diffused, the wear of the diffusion mechanism (diffusion member, pile of ironmaking raw material) is not caused.

  (C) Diffusion mechanism (diffusion member, peak of iron making raw material) because iron making raw material having a repose angle or more does not accumulate on the iron making raw material pile even when a highly adhesive iron making raw material containing moisture is introduced. It does not cause occlusion.

  (D) By changing the width and height position of the diffusion member, it is possible to change the width and diffusion direction of the iron-making raw material, and freely change the diffusion width of the iron-making raw material to be input according to the width of the sieve surface. Can be changed.

It is a side view which shows Embodiment 1 of this invention. It is a front view which shows Embodiment 1 of this invention. It is a front view which shows the other example of Embodiment 1 of this invention. It is a perspective view which shows Embodiment 2 of this invention. It is a flowchart which shows Embodiment 3 of this invention. It is a side view which shows Example 1 of this invention. It is a front view which shows Example 1 of this invention. It is a figure which shows the diffusivity evaluation in Example 1 of this invention.

  Embodiments of the present invention will be described with reference to the drawings.

[Embodiment 1]
The side view of Embodiment 1 of this invention is shown in FIG. 1, and a front view is shown in FIG.

  As shown in FIGS. 1 and 2, in the first embodiment, a two-stage chute 12 is installed between the belt conveyor 11 and the vibrating sieve 16. The upper chute 12a of the two-stage chute 12 has the same width as the width of the belt conveyor 11, and when the iron-making raw material 10 is supplied, the inclined surface 10a is formed at the repose angle θ specific to the raw material in the supply direction. Steelmaking raw materials 10 are stacked. On the other hand, the lower chute 12 b of the two-stage chute 12 has the same width as the sieve surface of the vibrating sieve 16.

  In addition, in the first embodiment, a diffusion member 13 is installed above the sieve surface of the vibrating sieve 16 and in front of the lower chute 12b. A pile 14 of the same iron-making raw material is formed.

  As a result, when the iron-making raw material 10 is introduced toward the slope of the iron-making raw material mountain 14, the supplied iron-making raw material 10 falls down and flows along the slope of the iron-making raw material mountain 14, and the vibrating sieve 16 It spreads in the width direction of the sieve surface.

  Note that the length L and width W of the diffusing member 13 and the height H from the upper surface of the diffusing member 13 to the upper end 12bt of the lower chute 12b are determined by the width in which the iron making raw material 10 is diffused and the angle of repose of the iron making raw material 10. To do. Here, the shape of the peak 14 of the iron-making material formed on the diffusion member 13 is determined by the angle of repose θ of the iron-making material.

  In the example shown in FIGS. 1 and 2, the position of the diffusing member 13 is adjusted so that the apex 14t of the peak 14 of the iron making raw material on the diffusing member 13 and the upper end 12bt of the lower chute 12b coincide. However, by shifting the position of the diffusing member 13 upward and forming the peak 14 of the iron making raw material as shown in FIG. 3, the amount of deposition near the center of the sieve surface can be increased. Thus, by adjusting the position of the diffusion member 13, the diffusion state of the iron-making raw material on the sieve surface can be adjusted.

[Embodiment 2]
A perspective view of Embodiment 2 of the present invention is shown in FIG.

  As shown in FIG. 4, the basic configuration of the second embodiment is the same as that of the first embodiment described above, and the vibrating sieve 16 in the first embodiment is replaced with a swinging repulsive sorter 17.

  That is, in the second embodiment, the diffusion member 13 is installed in front of the lower chute 12b above the sieve surface of the swinging repulsive sorter 17, and the iron-making raw material to be put on the diffusion member 13 is installed. The same iron-made raw material pile 14 as 10 is formed.

  Thus, when the iron making raw material 10 is introduced toward the slope of the iron making raw material mountain 14, the introduced iron making raw material 10 flows downward along the slope of the iron making raw material mountain 14, and the swinging repulsive sorting machine It diffuses in the width direction of 17 sieve surfaces.

[Embodiment 3]
FIG. 5 shows a flowchart in the third embodiment of the present invention.

  As shown in FIG. 5, the basic configuration of the third embodiment is the same as that of the second embodiment described above. After the adhering powder on the surface of the ore 10 is removed, the blast furnace 18 is charged.

  Examples of the present invention will be described.

  A perspective view of the sieve device used in this example is shown in FIG. 6, and a front view is shown in FIG. Basically, it is the same as Embodiments 1 and 2 of the present invention described above, but here, the vibrating sieve 16 and the swinging repulsive sorter 17 are omitted.

  A lump ore having a particle size range of about 1 to 50 mm was used for the iron making raw material 10 to be input. The repose angle θ of the lump ore 10 is about 40 degrees in actual measurement when the water content is about 3 mass%. Note that the angle of repose θ varies depending on the water content.

  The width of the belt conveyor 11 is 500 mm, the width of the upper chute 12a of the two-stage chute 12 is also 500 mm, and the width of the lower chute 12b of the two-stage chute 12 is 1500 mm. Assuming that the thickness is 1500 mm.

  The diffusion member 13 has a width W of 1000 mm and a height H and a length L of the ore on the diffusion member 13 in order to diffuse the lump ore 10 by 1000 mm (= 1500 mm−500 mm) in the width direction. 14 vertices 14t and the upper end 12bt of the lower chute 12b were adjusted.

  In addition, the recovery box 19 (Box1-Box5) was arranged in the width direction on the exit side of the lower chute 12b, and the diffusibility was evaluated by the weight ratio of the recovered material (the lump ore 10) recovered in each recovery box 19.

  FIG. 8 shows the diffusivity evaluation in this example. It can be seen that the lump ore 10 is almost uniformly diffused in the width direction.

10 Ironmaking raw materials (eg, lump ore)
10a Slope of iron making material 11 Belt conveyor 12 Two-stage chute 12a Upper chute of two-stage chute 12b Lower chute of two-stage chute 12bt Upper end of lower chute 13 Diffusion member 14 Pile of iron-making raw material (for example, pile of lump ore)
14t Peak of iron-making raw material 16 Vibrating sieve 17 Swinging repulsive sorter 18 Blast furnace 19 Collection box

Claims (2)

An iron making raw material sieving device, wherein a pile of the same iron making raw material as the iron making raw material to be input is formed on one rectangular plate-shaped diffusion member installed above the sieving surface. When the steelmaking raw material is thrown toward the front and both side slopes of the mountain , the steelmaking raw material flows downward along the front and both side slopes of the steelmaking raw material and diffuses in the width direction of the sieve surface. An iron making raw material sieving device characterized in that A method of charging an iron-making raw material into a sieving device, wherein a pile of the same iron-making raw material as the iron-making raw material to be input is formed on one rectangular plate-shaped diffusion member installed above the sieve surface, The steelmaking raw material is thrown toward the front and both side slopes of the steelmaking raw material mountain , and the steelmaking raw material is dropped down along the front and both side slopes of the ironmaking raw material mountain , so that the width of the sieve surface A method of charging a steelmaking raw material into a sieving apparatus, characterized by being diffused in a direction.

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