JP5370211B2 - Raw material method and equipment for low-grade iron scrap - Google Patents

Description

The present invention removes non-ferrous content such as copper wire from low-grade iron scrap (low-grade iron scrap) mixed with non-ferrous content such as copper wire, and has high purity that can be reused as a steelmaking raw material for high-grade steel materials. The present invention relates to a method and an apparatus for obtaining iron scrap (high-purity iron scrap).

  Conventionally, iron scrap derived from scrapped automobiles and building waste has been used as an iron making raw material (iron source) in an electric furnace in the electric furnace iron making process. In that case, after scrapping a scrap car at a scrap factory and sorting and recovering iron-based scrap (iron scrap) with a magnetic separator, it is pressed into a predetermined shape for convenient storage and transportation. Or are cut and bound and shipped. In the electric furnace factory, the received iron scrap is unwound, put into the electric furnace, and used as an iron source (see, for example, Patent Document 1).

  In addition, in [Mode for carrying out the invention], which will be described later, the following Patent Document 2 is cited, which is also described here.

JP-A-10-195516 JP-A-10-225930

  In recent years, from the viewpoint of expanding the use of iron scrap, even in the blast furnace ironmaking process, iron scrap is mixed with blast furnace hot metal, and it is put into refining equipment such as converters and topped cars to be used as ironmaking raw materials (iron sources). It has become.

  However, at that time, in order to make steel production raw materials for high-grade steel materials, high purity is achieved by sufficiently separating and removing non-ferrous contaminants such as copper wires and plastics in iron scrap, which was not a problem in the past. It has become necessary to make iron scrap.

The present invention has been made in view of the circumstances as described above, and removes non-ferrous components such as copper wires from low-grade iron scrap mixed with non-ferrous components such as copper wires to produce iron-making raw materials for high-grade steel materials. It is an object of the present invention to provide a raw material production method and raw material production apparatus for low-grade iron scrap capable of accurately obtaining reusable high-purity iron scrap.

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

  [1] Low-grade iron scrap mixed with copper wire is crushed by a crusher, and the crushed mixture is crushed by a vibrating conveyor after loosening the copper wire intertwined with iron by a rocking repulsive sorter. When the mixture is transported and sorted into a magnetic material and a non-magnetic material by a magnetic separator, the material sorted as a magnetic material is recovered as high-grade iron scrap, and when the recovered high-grade iron scrap is used as a steelmaking raw material, A method for producing low-grade iron scrap as a raw material, characterized in that the tip of the screen of the swinging repulsive sorter and / or the tip of the vibrating conveyor is formed in a lattice shape.

[2] The method for producing low-grade iron scrap as described in [1], wherein the lattice at the tip is a slit-shaped lattice extending in the conveying direction of the crushed mixture.
[3] A crusher for crushing low-grade iron scrap mixed with copper wire, and a swinging repulsive sorter for loosening the copper wire intertwined with iron in the crushing mixture after crushing by the crusher, Low grade equipped with a vibrating conveyor for transporting the crushed mixture, a magnetic sorter for sorting the magnetic material and non-magnetic material, and a recovery mechanism for collecting the magnetic material sorted as high-grade iron scrap A low-grade iron scrap raw material generating apparatus, characterized in that the tip portion of the screen of the swinging repulsive sorter and / or the front end portion of the vibrating conveyor has a lattice shape.
[4] The low-grade iron scrap raw material production apparatus according to [3], wherein the lattice at the tip is a slit-shaped lattice extending in the conveyance direction of the crushed mixture.

  In the present invention, non-ferrous components such as copper wires can be removed from low-grade iron scrap, and high-purity iron scrap that can be reused as an iron-making raw material for high-grade steel materials can be accurately obtained. As a result, high-grade steel materials can be efficiently produced using a large amount of low-grade iron scrap that has not been conventionally used as an iron source for production of high-grade steel materials such as automobile outer plates.

It is a processing flow figure in one embodiment of the present invention. It is a schematic diagram of the process sequence in one Embodiment of this invention. It is a figure which shows the rocking | pulling repulsive sorter used in one Embodiment of this invention. It is a figure which shows the vibration conveyor used in one Embodiment of this invention.

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

  FIG. 1 is a processing flow diagram according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a processing procedure.

  First, the low-grade iron scrap 11 mixed with non-ferrous components such as copper wire is crushed by the crusher 21 into a lump (medium lump) having a size of about 150 mm.

  Thereafter, it is sufficient that high-purity iron scrap can be obtained by magnetically sorting iron 1 from this crushing mixture (iron 1 and copper wire 2 are mixed) 12. However, in crushing mixture 12, copper wire 2 is changed to iron 1 It is entangled, and it is difficult to properly select the magnetic force as it is.

  Therefore, the pulverized mixture 12 is loosened by a swinging repulsive sorter (oscillating rotary sorter) 22 to eliminate the entanglement of the copper wire 2 with the iron 1, and then the magnetic mixture of the crushed mixture 12 is selected.

  Incidentally, as described in Patent Document 2, the swinging repulsive sorter is a tilting screen that performs a swinging motion (amplitude is 30 mm or more) such that the load is moved upward by tilting the crankshaft. A form sorter that sorts the mixture to be sorted using the fact that the trajectory that repels on the inclined screen varies depending on the weight, shape, and hardness of the objects that make up the sorting object. is there.

  When the pulverized mixture 12 in which the iron 1 and the copper wire 2 are mixed is introduced into the swinging repulsive sorter 22, the strongly repulsive iron 1 exhibits a large-bouncing conveyance behavior, and the copper wire 2 having a small rebound is a screen. Move up and down the slope.

  As a result, when the copper wire 2 intertwined with the iron content 1 is loosened and transferred to the next vibrating conveyor 23, the iron content 1 is present in the upper layer of the conveyed product 13 (crushed mixture 12), and the copper wire 2 is present in the lower layer. It becomes like this.

  Here, with respect to the swinging repulsive sorter 22, the tip of the inclined screen is formed in a lattice shape. Here, as shown in FIG. 3, a slit-like lattice is provided at the tip 32 a of the inclined screen 32. Thereby, a copper wire smaller than the width of the slit falls from the inclined screen 32, and the copper wire can be removed as a rough selection.

  In addition, the vibration conveyor 23 also has a lattice-shaped tip portion of the vibration surface. Here, as shown in FIG. 4, a slit-like lattice is provided at the tip 33 a of the vibration surface 33. Thereby, a copper wire smaller than the width of the slit falls from the vibration surface 33, and the copper wire can be removed as a further rough selection.

  As a result, the magnetic material 14 (iron 1) and the non-magnetic material 15 (copper wire 2) can be easily selected in the next magnetic separator (drum type magnetic separator or suspended magnetic separator) 24.

  The crushed material (iron content 1) selected as the magnetic material 14 by the magnetic separator 24 becomes high-purity iron scrap (high-grade iron scrap), which can be reused as an iron-making raw material for high-grade steel materials. it can.

  In the above, the grid provided at the tip of the inclined screen 32 and the tip of the vibration conveyor 23 is not limited to the slit-like grid, but when the slit-like grid is provided, it extends in the transport direction. A slit is preferable. This is because if the slit extends in the width direction, the crushing mixture 12 and the conveyed product 13 may be prevented from being conveyed.

  And the width | variety and length of a slit should just be suitably defined based on the magnitude | size (a magnitude | size of about 150 mm) of the crushing mixture 12 and the conveyed product 13. FIG.

  Incidentally, in this embodiment, although both the front-end | tip part of the inclined screen 32 and the front-end | tip part of the vibration conveyor 23 are made into the grid | lattice form, you may make either one into a grid | lattice form.

DESCRIPTION OF SYMBOLS 1 Iron 2 Copper wire 11 Low grade iron scrap 12 Crushing mixture 13 Conveyed material 14 Magnetic material 15 Nonmagnetic material 21 Crusher 22 Oscillation repulsion sorter 23 Oscillation conveyor 24 Magnetic sorter 32 Inclined screen of oscillation repulsion sorter 32a Tilting screen tip (slit-like lattice) of swing repulsive sorter
33 Vibrating part of vibratory conveyor 33a Tip of vibratory conveyor (slit lattice)

Claims (4)

  Crushing low-grade iron scrap mixed with copper wire with a crusher, loosening the copper wire intertwined with iron with a rocking repulsive sorter against the crushing mixture, and then transporting the crushing mixture with a vibrating conveyor When the magnetic material is sorted into a magnetic material and a non-magnetic material by a magnetic separator, the material sorted as a magnetic material is collected as high-grade iron scrap, and when the collected high-grade iron scrap is used as a steelmaking raw material, A method for producing low-grade iron scrap as a raw material, characterized in that the front end of the screen of the type sorter and / or the front end of the vibrating conveyor is formed in a lattice shape.   The method for producing a raw material for low-grade iron scrap according to claim 1, wherein the lattice at the tip is a slit-shaped lattice extending in the conveying direction of the crushed mixture.   A crusher for crushing low-grade iron scrap mixed with copper wire, a rocking repulsive sorter for loosening the copper wire intertwined with the iron content of the crushed mixture after crushing by the crusher, and a crushing mixture A low-grade iron scrap equipped with a vibrating conveyor for transporting, a magnetic separator for sorting magnetic and non-magnetic materials, and a recovery mechanism for collecting the magnetic material sorted as high-grade iron scrap A raw material producing apparatus for producing raw material for low-grade iron scrap, characterized in that the tip of the screen of the oscillating and repulsive sorter and / or the tip of the vibratory conveyor has a lattice shape.   The apparatus for producing low-grade iron scrap as a raw material according to claim 3, wherein the lattice at the tip is a slit-shaped lattice extending in the conveying direction of the crushed mixture.

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