KR100331604B1 - Method for reusing the polyethylene rosin of waste cable by solvent. - Google Patents

Abstract

The present invention relates to a method for recycling polyethylene resin in a waste communication cable using a solvent capable of separating and recycling only high-quality polyethylene resin formed on the outer surface of the waste communication cable.

In order to achieve the above object, the present invention collects a polyetchene resin outer shell with a pitch bonded from the waste communication cable and cuts it to a predetermined size, and the sorbent is dissolved by treating the cut outer shell with a washing solvent by treating it with a washing solvent. Only the pure polyethylene resin is removed, and the resin is chipped and recycled through an extruder, and the used cleaning solvent is recovered and recycled through a solvent recovery process. It was made to be recycled.

Description

Method for reusing the polyethylene rosin of waste cable by solvent.

The present invention relates to a method for recycling polyethylene resin in a waste communication cable using a solvent that collects waste communication cables and then separately collects and recycles only the polyethylene resin forming the outer shell of the communication cable.

The communication cable consists of the following:

There are several strands of coated copper wire in the inner center, and the outer surface is covered with paper tape, iron or aluminum tube, pit paper (coltal), and polyethylene resin.

At this time, the poly ethylene resin coated on the outer skin is compounded with expensive physical properties such as anti-aging and anti-ultraviolet, and the recycling becomes a very high value-added material.

However, currently, the method of separating and recycling poly ethylene resin coated on the waste communication cable is impossible to separate and collect only the poly ethylene layer, which is the outer layer during the separate collection. There was a difficulty in recycling.

The present invention is to remove the poly ethylene coating material bonded to the pit (coltal) is bonded from the waste communication cable to correct the conventional disadvantages, and then to remove the filtration paper bonded to the poly ethylene coating resin to remove the high quality poly ethylene resin To collect and recycle.

In order to achieve the above object, the present invention collects the polyetchene resin sheath to which the pitch is bonded and then washes with a solvent that dissolves the pit but dissolves the leach, leaving only the poly ethylene resin and then extruding and chipping. It is recycled, and the cleaning solvent is evaporated, recovered and reused, and the remaining filtration is recycled for another use.

1 is a schematic diagram of a process of the present invention.

2 is an enlarged view of a part of the process configuration of FIG. 1;

3 is an enlarged view of a part of the process configuration of FIG. 1;

<Description of the symbols for the main parts of the drawings>

(2)-basket (6)-pump

(8)-Conveyor (10)-Crusher

(12)-Blower (14)-Separator

(16)-Pulverizer (20)-Garage

(22)-Wash Tank (24)-Evaporator

(26)-Reservoir (28)-Supply Line

(30)-Condenser (32)-Receiver Tank

(34)-Extruder (36)-Pilta Press Filter

(44)-Solvent Storage Tanks (46)-Vacuum Pumps

(48)-First Mixing Tower (50)-Second Mixing Tower

(52) (54)-Circulation Pump (56)-Distillers

(58)-Boiler (60)-Condenser

Hereinafter, an embodiment of the present invention will be described in detail by process according to the accompanying drawings.

Figure 1 is a process diagram of the present invention, Figures 2 and 3 is an enlarged view of the process diagram of Figure 1, the process of the present invention is largely divided into a cutting process of the waste communication cable and the cleaning process using a solvent, and a solvent recovery process If it can be classified, each process will be described in detail as follows.

Step 1: Cutting and Washing Process

This process is to cut the sheath separated from the waste communication cable to a certain length and to remove the puddle bonded to the inner surface, and to store the recycled polyethylene resin sheath bonded to the pulp (coltal) in the collecting container (2). Then, the polyethylene resin sheath stored in the collecting container (2) is fed to the grinder (10) through a conveyor (8), cut into a predetermined size, and then transferred to a cyclone separator (14) using a blower (12). The polyethylene resin sheath cut through the cyclone separator 14 is stored in the material container 16.

The cut material stored in the material container 16, that is, about 1 kg of polyethylene resin shell, was loaded on the Gacha 20, put into the washing tank 22, and the foreign matter remaining in the shell was solvent-treated to clean the outer shell. At the same time, the pit attached to the skin is also dissolved.

At this time, the amount of organic solvent used is about 1 L, and it is ideal to use a solvent having excellent compatibility and easy separation of boiling point difference, that is, toluene, tertiary ethylene ethylene or tertiary ethylene ethylene. to be.

The washing tank 22 is a horizontal type tank having a constant volume. The tank is equipped with a rail, a car, a heating device, and a moving device. After opening, only the pure polyethylene resin shell obtained by dissolving pit paper is obtained.

The pure polyethylene resin shell thus obtained is stored in a separate storage container 26, chipped through an extruder 34, and then recycled. The cleaning solvent generated in the cleaning tank is evaporator 24 through the supply pipe 28. It is fed to the feedstock, and is recovered and reused through the evaporation recovery process.

The washing solvent used in the first step or the dissolved filtration and foreign matter is separated into the cleaning solvent and mixed foreign matter through the evaporator 24, and then the solvent is recycled and the mixed foreign matter is separated into residue and pit paper.

More specifically, if the cleaning solvent containing foreign matter is injected into the evaporator 24 to maintain the reduced pressure through the supply pipe 28, the cleaning solvent is vaporized and supplied to the condenser 30, the condenser 30 The gasified solvent gas supplied is cooled and condensed and collected in the receiver tank 32.

In the evaporator 24, a stirrer 25 is installed, which not only promotes vaporization of the washing solvent, but also can expect almost complete solvent recycling.

After the cleaning solvent is vaporized and exhausted in the evaporator 24, the pit and foreign matter remains, the residual mixture is cooled and then separated the pit or foreign matter through the filter filter 36, the separated filtration is recycled Done.

The washing solvent condensed in the receiver tank 32 is stored in the solvent storage tank 44 and then supplied to the washing tank 22 installed in the first process for recycling, and the remaining condensation in the condenser 30 is not washed. The solvent and a small amount of water are supplied to the solvent reclaimer through the vacuum pump 46 to be recondensed to enhance the recovery efficiency of the solvent and to exhaust only non-condensable gas or moisture to the outside to minimize air pollution. .

Solvent recovery device is the same as the recovery device described in the contents of the application filed by the applicant (Patent Application No. 94-40779, 'Recovery Treatment Method for Waste Vinyl Chloride Using Solvent').

That is, when water or gas that is not condensed in the receiver tank 32 is supplied to the first and second mixing towers 48 and 50, the circulation pump 52 configured at one side of the lower ends of the first and second mixing towers 48 and 50. (54), the gas sucked into the circulating pumps (52) and (54) is mixed with the emulsion to form a mixed liquid, some of the mixed liquid is supplied to the distiller 56, the remainder of the first and second mixture The operation of supply injection to the tower is repeated continuously.

The mixed liquid supplied to the distillation unit 56 is vaporized in the distillation unit 56 heated by the heat source of the boiler 58 is transferred to the condenser 60, the solvent gas transferred to the condenser 60 is Condensation is liquefied and supplied to the solvent storage tank 44 to maximize the recovery rate of the cleaning solvent.

Reference numeral 70 is a bunker C oil storage tank, 72 is a service tank, 74 is an expansion tank, and 76 is a fruit storage tank.

As described above, the outer sheath separated from the communication cable is cut to a certain size, and then, using a cleaning solvent, dissolving and removing the spigot (coltal) bonded to the inner surface of the polyethylene resin sheath to obtain pure polyethylene resin. Chips are recycled through an extruder, and the cleaning solvent mixed with foreign substances generated in the washing process is recovered and reused only after the solvent is recovered through the solvent recovery process. The present invention is completed by separating and collecting pit paper and foreign matters by squeezing and recycling the pit paper and discarding the foreign matters.

Therefore, the present invention collects and recycles only high-quality poly ethylene resin from waste communication cables generated in large quantities, which is very advantageous in terms of resource recycling, and the cleaning solvent used in the washing process is also collected and recycled through the solvent recovery process. It is effective in reducing costs and environmental pollution.

Claims (1)

Separating the polyetchene resin sheath to which the pit is bonded from the waste communication cable, and cut into a certain size with a grinder (10), the cut outer shell is put into the washing tank 22 and washed with a washing solvent in which the pit is dissolved Only the pure polyethylene resin shell is obtained by dissolving and removing the pit paper bonded to the shell, and the polyethylene resin shell is chipped through an extruder 34 and then recycled, and the cleaning solvent is transferred to the evaporator 24. In the evaporator 24, the cleaning solvent is vaporized, the vaporized cleaning solvent is condensed and recycled, and the remaining filter paper and foreign matter is cooled and then treated with a filter press filter 36 to separate the blood and foreign material. A method for recycling polyethylene resin in waste communication cables using a solvent.