JP2009084603A - Method for converting low-grade iron scrap into raw material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for converting low-grade iron scrap into a raw material by which high-purity iron scrap recyclable as a raw material for iron manufacture for high-grade steel products can be obtained with certainty by removing nonferrous substances such as copper wires from low-grade iron scrap in which nonferrous substances, such as copper wires and plastics, are mixed. <P>SOLUTION: The low-grade iron scrap is crushed and separated by a hammer type crusher 11. The resulting crushed mixture is sorted and recovered, by an oscillating repulsion type selector 13, into heavyweight materials, lightweight materials and small-diameter materials. The crushed materials, sorted and recovered as heavyweight materials, are utilized as a raw material for iron manufacture. <P>COPYRIGHT: (C)2009,JPO&INPIT

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. It is related with the method of obtaining the iron scrap (high purity iron scrap).

  Conventionally, iron scrap derived from scrapped automobiles and building waste has been used as an ironmaking raw material (iron source) in an electric furnace in the electric furnace ironmaking process. In that case, after scrapping scrapped automobiles 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 an electric furnace factory, the received iron scrap is unwound, put into the electric furnace, and used as an iron source (for example, refer to Patent Document 1).

In the [Best Mode for Carrying Out the Invention] to be described later, the following Patent Document 2 is cited, which is also described here.
JP 10-195516 A 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 then used as a raw material for iron making (iron source) by introducing it into refining equipment such as converters and topies. 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 above circumstances, and removes non-ferrous components such as copper wires from low-grade iron scrap mixed with non-ferrous components such as copper wires and plastics, for high-grade steel materials. It is an object of the present invention to provide a method for converting low-grade iron scrap into a raw material that can accurately obtain high-purity iron scrap that can be reused as an iron-making raw material.

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

  [1] Iron scrap mixed with copper wire and plastics is crushed and separated by a crusher, and the crushed mixture is sorted and recovered into heavy, light and small-diameter items by a rocking repulsive sorter. As a raw material for low-grade iron scrap, the crushed material selected and collected as a raw material is used as a raw material for iron making.

  [2] The above-mentioned [1], wherein the crushed material sorted and collected as a heavy material is sorted into a magnetic material and a non-magnetic material by a magnetic separator, and the crushed material collected as a magnetic material is used as a steelmaking raw material. ] The raw-material manufacturing method of the low grade iron scrap described in the above.

  [3] The above-mentioned [1] or [1], wherein after removing lightweight plastic from the crushed mixture by a wind sorter, sorting and collecting into heavy, lightweight and small-diameter items by a swinging repulsive sorter 2] The method for producing low-grade iron scrap as a raw material.

  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.

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

(First embodiment)
FIG. 1 is a process flow diagram showing a first embodiment of the present invention.

  As shown in FIG. 1, a low-grade iron scrap that is derived from scrapped automobiles and building waste and mixed with non-ferrous components such as copper wires and plastics is lumped by a hammer type crusher 11 to a size of about 100 to 150 mm. Crush into (medium). At that time, in the hammer type crusher 11, the plurality of hammers rotated, so that the low-grade iron scraps that were input were crushed and the crushed materials were worn away and joined to the iron portion by soldering. The copper wire comes off. As a result, iron scrap in which iron, copper wire, and plastics are integrated is crushed and separated into iron, copper wire, and plastics.

  After that, it is sufficient if high purity scrap iron can be obtained by magnetically sorting iron from this crushing mixture (mixed of iron, copper wire, and plastics). However, in the crushing mixture, copper wire is converted into iron and plastics. It is entangled and it is difficult to properly select the magnetic force as it is.

  Therefore, in this embodiment, the crushed mixture is sorted and collected into heavy, lightweight, and small-diameter items by a swinging repulsive sorter (oscillating rotary sorter) 13 to obtain iron and plastics. After removing the tangling of the copper wire, the magnetic selection is performed.

  Here, as described in Patent Document 2, the swinging repulsive sorter 13 performs a swinging motion (amplitude is 30 mm or more) such that the mounted object is sent upward by tilting the crankshaft. Form sorting that sorts the mixture to be sorted by using the fact that the trajectory repels on the tilting screen is different depending on the weight, shape and hardness of the objects that make up the sorting object. A heavy object with a large amount of rebound on the inclined screen is collected below the inclined screen, and a lightweight object with a small amount of rebound on the inclined screen is collected above the inclined screen. Small small-diameter objects are structured so as to be collected under a sieve of an inclined screen.

  Therefore, when a pulverized mixture in which iron, copper wire, and plastics are mixed is put into such a swinging repulsive sorter 13, lightweight plastic and copper wire are recovered on the lightweight object side above the inclined screen. A small-diameter material such as brittle plastic is recovered under the screen of the inclined screen, and iron and some non-ferrous contaminants are recovered on the heavy material side below the inclined screen.

  The crushed material (iron and some non-ferrous contaminants) collected on the heavy load side by the swinging repulsive sorter 13 is separated by the magnetic separator 14 into a magnetic material (iron) and a non-magnetic material (non-ferrous contaminant). ).

  Thereby, the crushed material selected as a magnetic material by the magnetic separator 14 becomes high-purity iron scrap, and can be reused as an iron-making raw material for high-grade steel materials.

  In the above, the hammer grade crusher 11 crushes and separates the low grade iron scrap into iron, copper wire and plastics, but crushes and separates the low grade iron scrap into iron, copper wire and plastics. Any other crusher (for example, a guillotine crusher) may be used as long as it can be separated.

(Second Embodiment)
FIG. 2 is a process flow diagram showing the second embodiment of the present invention.

  In the first embodiment described above, the urethane foam is lightweight at the time of sorting by the swinging repulsive sorter 13, but in the case of a block form, it is collected on the heavy object side. Thereby, in the subsequent sorting by the magnetic sorter 14, the urethane foam may be entangled with iron, although not as much as the copper wire.

  Therefore, in this second embodiment, the mixture crushed by the hammer type crusher 11 is put into the wind power sorter 12 to remove the urethane foam and then put into the swinging repulsive sorter 13. Yes.

  As a result, the urethane foam does not get entangled with iron during sorting by the magnetic separator 14, so that the crushed material sorted as a magnetic substance by the magnetic separator 14 becomes iron scrap of even higher purity.

  In the first embodiment and the second embodiment, if the iron purity of the crushed material collected on the heavy load side by the swinging repulsive sorter 13 is good, the subsequent magnetic sorter 14 It is also possible to use it as an iron-making raw material as it is without performing the sorting.

It is a processing flow figure in a 1st embodiment of the present invention. It is a processing flowchart in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Hammer type crusher 12 Wind power sorter 13 Swing repulsion sorter 14 Magnetic sorter

Claims (3)

  Iron scrap mixed with copper wire and plastics is crushed and separated by a crusher, and the crushed mixture is sorted and recovered into heavy, light, and small-diameter items by a rocking repulsive sorter and sorted as heavy. A method for producing low-grade iron scrap as a raw material, characterized in that the recovered crushed material is used as a raw material for iron making.   The crushed material sorted and collected as a heavy material is sorted into a magnetic material and a non-magnetic material by a magnetic separator, and the crushed material collected as a magnetic material is used as an iron-making raw material. Raw material for low-grade iron scrap.   3. The low-pressure material according to claim 1, wherein light plastic is removed from the crushed mixture by a wind power sorter, and then sorted and collected into a heavy object, a lightweight object, and a small-diameter object by an oscillating repulsive sorter. Raw material for high-grade iron scrap.

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