JP2017013024A - Method for recovering metal pieces from mixed waste including plastic and metal pieces - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preferably separate metal pieces from mixed waste including plastic and the metal pieces.SOLUTION: Mixed waste including plastic and metal pieces is placed onto a rotary table 12 of a vertical type roller mill 1 having the rotary table 12. The mixed waste is crushed by the rotary table 12 and a crush roller 13 provided above the rotary table 12. Crushed objects is blown upward by a gas introduced from an area below the rotary table 12. Objects dropped from the rotary table 12 are recovered.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for recovering metal pieces from mixed waste containing plastic and metal pieces.

  Various methods for treating mixed waste containing plastic and metal pieces are known. For example, Patent Document 1 describes that a mixed waste containing plastic is roughly crushed, the coarsely crushed material is subjected to wind sorting, and separated into a light weight and a weight. In Patent Document 1, the lightweight component mainly includes soft waste plastics, fibers, and the like, and the weight component mainly includes metal waste, debris waste, large-diameter hard There is a description that waste plastics will be separated.

JP 2010-214677 A

  By the way, from the viewpoint of promoting recycling of metal pieces, there is a demand for separating and collecting metal pieces from other wastes from mixed waste including plastic and metal pieces.

  However, in the treatment method described in Patent Document 1, the weight includes not only metal wastes but also debris wastes and the like. For this reason, the processing method described in Patent Document 1 cannot separate metal wastes from debris wastes. Therefore, it is difficult to suitably recover the metal waste.

  The main object of the present invention is to suitably separate metal pieces from mixed waste containing plastic and metal pieces.

  In the method for recovering metal pieces from mixed waste containing plastic and metal pieces according to the present invention, mixed waste containing plastic and metal pieces is put on the rotary table of a vertical roller mill having a rotary table. The mixed waste is pulverized by a rotary table and a pulverizing roller provided above the rotary table. The pulverized product is blown upward by the gas introduced from below the rotary table. Collect falling objects from the rotary table.

  In the method for recovering metal pieces from mixed waste containing plastic and metal pieces according to the present invention, the pulverized product is blown upward by the gas introduced from below the rotary table. For this reason, wastes with low specific gravity other than high specific gravity metal pieces among mixed wastes are unlikely to fall from the rotary table. The fallen object from the rotary table becomes a metal piece having a substantially high specific gravity. Therefore, the metal piece can be suitably recovered by recovering the fallen object from the rotary table.

  In the method for recovering metal pieces from mixed waste containing plastic and metal pieces according to the present invention, the mixed waste is sized so that waste other than metal pieces out of the mixed waste is blown upward by gas. It is preferable to grind the product.

  In the method for recovering metal pieces from the mixed waste containing plastic and metal pieces according to the present invention, the residue remaining without blowing up on the rotary table is removed from the rotary table by centrifugal force generated by rotating the rotary table. It is preferable to drop.

  According to this invention, a metal piece can be suitably fractionated from the mixed waste containing a plastic and a metal piece.

It is a schematic diagram of the vertical roller mill which concerns on one Embodiment of this invention.

  Hereinafter, an example of the preferable form which implemented this invention is demonstrated. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.

(Vertical roller mill 1)
FIG. 1 is a schematic diagram of a vertical roller mill 1 according to the present embodiment. In the present embodiment, using the vertical roller mill 1 shown in FIG. 1, metal pieces are collected from mixed waste containing plastic and metal pieces (hereinafter sometimes simply referred to as “mixed waste”). First, the configuration of the vertical roller mill 1 will be described with reference to FIG.

  The saddle type roller mill 1 includes a cylindrical main body 10. A crushing part 11 is provided inside the main body part 10. In the pulverizing unit 11, the mixed waste is pulverized. The crushing unit 11 includes a rotary table 12 and a crushing roller 13.

  The rotary table 12 is connected to the electric motor 14. The turntable 12 is rotationally driven by the electric motor 14. The axis of the rotary table 12 extends in the vertical direction.

  A plurality of crushing rollers 13 are provided above the rotary table 12. The plurality of crushing rollers 13 are provided at equal intervals along the circumferential direction of the rotary table 12. The crushing roller 13 is provided so that the peripheral surface of the crushing roller 13 faces the upper surface of the rotary table 12. The crushing roller 13 rotates as the rotary table 12 rotates. Accordingly, the mixed waste is pulverized by the upper surface of the rotary table 12 and the peripheral surface of the pulverizing roller 13.

  An input portion 15 is attached to the main body portion 10. The input unit 15 is supplied with mixed waste. The input unit 15 is provided so that the supplied mixed waste is input onto the turntable 12. Specifically, the charging unit 15 is provided so that the mixed waste is charged into a portion of the upper surface of the rotary table 12 that is closer to the axial center than the portion where the crushing roller 13 is located.

  A gas supply port 16 is connected to a portion of the main body 10 below the rotary table 12. Gas is supplied from the gas supply port 16 to the main body 10. The supplied gas is discharged from the discharge port 17 connected to the top of the main body 10.

  A classifier 18 is provided in the main body 10. The classifier 18 is provided so that the gas supplied from the gas supply port 16 is discharged from the discharge port 17 via the classifier 18.

(Recovery method for metal pieces from mixed waste using vertical roller mill 1)
Next, a method for recovering metal pieces from mixed waste using the vertical roller mill 1 will be described.

  First, mixed waste containing plastic and metal pieces is supplied to the input unit 15. The supplied mixed waste is put on the rotary table 12.

  The charged mixed waste is pulverized by the rotary table 12 and the pulverizing roller 13 as the rotary table 12 rotates. However, in some cases, a solid having a spreadability such as a metal piece is not pulverized. Solids that do not have spreadability such as plastic and gravel are crushed.

  The pulverized product is blown upward by the gas supplied from the gas supply port 16 and introduced from below the rotary table 12. Of the pulverized material blown up, the pulverized material that has passed through the classifier 18 is discharged from the discharge port 17. Of the pulverized material blown up, the pulverized material that has not passed through the classifier 18 falls on the rotary table 12 and is pulverized again. In this way, the mixed waste is pulverized so that the waste other than the metal pieces is blown upward by the gas.

  On the other hand, the metal piece has a high specific gravity and is not pulverized, so it does not blow up and remains on the turntable 12. The residue on the turntable 12 falls from the turntable 12 due to the centrifugal force generated when the turntable 12 rotates. The dropped residue is taken out from the main body 10 through the opening 19 and collected.

  As described above, in this embodiment, the pulverized product is blown upward by the gas introduced from below the rotary table 12. For this reason, waste of low specific gravity other than the high specific gravity metal piece of the mixed waste is unlikely to fall from the turntable 12. The fallen object from the turntable 12 becomes a metal piece having a substantially high specific gravity. Therefore, the metal piece can be suitably recovered by recovering the fallen object from the rotary table 12.

DESCRIPTION OF SYMBOLS 1 Vertical roller mill 10 Main-body part 11 Crushing part 12 Rotary table 13 Crushing roller 14 Electric motor 15 Input part 16 Gas supply port 17 Outlet 18 Classifier 19 Opening part

Claims (3)

Throwing mixed waste containing plastic and metal pieces onto the rotary table of a vertical roller mill having a rotary table;
Crushing the mixed waste by the rotary table and a crushing roller provided above the rotary table;
A step of blowing up the pulverized product upward by a gas introduced from below the rotary table;
Collecting the fallen object from the rotary table;
A method for recovering metal pieces from mixed waste containing plastic and metal pieces.   The mixed waste containing plastic and metal pieces according to claim 1, wherein the mixed waste is pulverized so that waste other than metal pieces of the mixed waste is blown upward by the gas. How to recover metal pieces from objects.   The mixed waste containing plastic and metal pieces according to claim 1 or 2, wherein a residue remaining without blowing up on the turntable is dropped from the turntable by centrifugal force generated by rotation of the turntable. How to recover metal pieces from objects.