JP3914627B2 - Waste plastic recycling method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for recycling plastic waste, and more particularly to a method and apparatus for recycling plastic waste with acid, alkali, heavy metal, oil, etc., such as plastic by recycling a waste battery case. .
[0002]
[Prior art]
Conventionally, methods for regenerating a battery case include those disclosed in Japanese Patent Application Laid-Open Nos. 52-152976 and 57-15371, for example.
[0003]
[Problems to be solved by the invention]
However, in the above conventional method, a large amount of waste water that may contaminate the environment such as acid, lead fine powder, lead ions, etc. is generated from the washing process, and large-scale equipment and cost are required to purify them. there were.
[0004]
Further, in order to prevent corrosion due to dilute sulfuric acid in the battery, it was necessary to make all equipment up to the water washing process expensive expensive corrosion-resistant equipment.
[0005]
The present invention eliminates the above-mentioned drawbacks.
[0006]
[Means for Solving the Problems]
The waste plastic recycling apparatus of the present invention includes a rough crusher for roughly crushing waste plastic, a first-stage washing tank for washing waste plastic lump obtained by coarse crushing, and a lime in the first-stage washing tank and the coarse crusher. Washed by means for supplying water, a fine crusher for finely crushing the waste plastic lump washed in the first-stage washing tank, a final-stage washing tank for washing the finely-pulverized plastic, and the final-stage washing tank It comprises drying means for drying the finely pulverized plastic, and means for supplying neutralized washing water into the first stage washing tank, the last stage washing tank, and the coarse crusher.
[0007]
The neutralized washing water containing lime water in the first stage washing tank is further circulated to further form a water flow in the first stage washing tank.
[0008]
The method for reclaiming waste plastic according to the present invention includes a step of roughly crushing waste plastic while adding neutralized washing water and lime water, and a crushed and neutralized waste plastic lump containing lime water in the first-stage washing tank. A step of washing with Japanese washing water, a step of finely pulverizing the plastic lump washed in the first-stage washing tank, a step of washing the finely divided plastic with neutralized washing water in the final-stage washing tank, and a fine pulverization And a step of dehydrating and drying the washed plastic.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
In the waste plastic recycling method of the present invention, as shown in FIG. 1, a waste storage battery case to be processed is put into the crusher 2 through the conveyor 1 and roughly crushed into a lump of 15 mm or less, for example. Neutralized washing water is sprayed into the crusher 2 via a line 3, and lime water is sprayed as described later to neutralize dilute sulfuric acid and the like adhering to the waste storage battery case.
[0011]
The crushed and neutralized waste plastic lump falls into the first-stage washing tank 4, and lime water having a pH of 7-9 from the emulsification tank 5 in which slaked lime and water are stirred and mixed at one upper end of the first-stage washing tank 4. Is added through the line 6 and neutralized washing water through the line 7, and the water in the first stage washing tank 4 is circulated from the lower end of the other end to the upper end of the first stage washing tank 4 via the pump 8. A water flow from one end to the other is formed in 4.
[0012]
A perforated air pipe 9 for aeration is arranged on the lower surface of the first-stage cleaning tank 4 to aerate the paste, waste plastic lump, neutralized starch, lead powder, gypsum, sand, etc. deposited on the lower surface. The lump is separated and sent to the cutter pump 10 from the opening at the other end with the help of the water flow in the first-stage washing tank 4, where it is pulverized to a size of, for example, 5 mm.
[0013]
The plastic finely pulverized by the cutter pump 10 is sent to the net of the dewatering tank 11 where the plastic and the neutralized washing water are separated, and the plastic is dropped into the final washing tank 12 and added via the line 13. Then, it is washed with neutralized washing water, and then dehydrated and dried by a dehydrating dryer 14 to be taken out as clean finely pulverized plastic having a uniform particle size.
[0014]
The neutralized washing water in the dehydration tank 11 and the final stage washing tank 12 is returned to the first stage washing tank 4 via lines 15 and 16 using a pump or the like. Further, neutralized washing water containing lime water in the first stage washing tank 4 is supplied to the crusher 2 through the line 17 by the pump 8 so as to prevent the crusher 2 from being corroded by acid. It is circulated in the first stage washing tank 4 through the line 18.
[0015]
When the neutralized starch deposited in the first-stage washing tank 4 reaches a certain amount, the circulating neutralized washing water is removed, and the neutralized starch is extracted using an underwater pump or the like and recycled as lead resources.
[0016]
The waste plastic recycling apparatus of the present invention comprises a rough crusher 2 for roughly crushing waste plastic contaminated with acids, alkalis, heavy metals, oils, etc., and a first-stage washing tank for washing waste plastic lump obtained by rough crushing 4, a pump 8 for supplying lime water into the first-stage washing tank 4 and the coarse crusher 2, a cutter pump 10 for finely pulverizing the waste plastic lump washed in the first-stage washing tank 4, A final-stage washing tank 12 for washing the plastic, a dehydration dryer 14 for drying the finely pulverized plastic washed by the final-stage washing tank 12, the first-stage washing tank 4, the final-stage washing tank 12 and the coarse crusher 2 and lines 7, 13 and 3 for supplying neutralized washing water.
[0017]
In the waste plastic recycling apparatus of the present invention, the neutralized washing water containing the lime water in the first stage washing tank 4 is circulated by the circulation pump 8 in order to form a water flow in the first stage washing tank.
[0018]
【The invention's effect】
As described above, in the present invention, waste plastic cleaning is divided into two stages, a first stage and a final stage. In the first stage, lime water is added as a neutralizing agent and a precipitating agent, and the neutralization cleaning used for this first stage cleaning is performed. Since water is supplied into the crusher and circulated, corrosion of the equipment due to harmful substances can be greatly suppressed.
[0019]
In addition, since the cleaning water used for the cleaning in the first stage and the final stage is circulated and used, there is a great advantage that the amount of waste water that may contaminate the environment can be suppressed.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a waste plastic recycling method and apparatus according to the present invention.
[Explanation of symbols]
1 Conveyor 2 Rough crusher 3 Line 4 First stage washing tank 5 Emulsification tank 6 Line 7 Line 8 Circulating pump 9 Air pipe 10 Cutter pump 11 Dehydration tank 12 Final stage washing tank 13 Line 14 Dehydration dryer 15 Line 16 Line 17 Line 18 line

Claims (3)

  A rough crusher for roughly crushing waste plastic, a first-stage washing tank for washing waste plastic lump obtained by coarse crushing, a means for supplying lime water into the first-stage washing tank and the coarse crusher, and the first-stage washing tank A fine crushing machine for finely pulverizing the waste plastic lump washed inside, a final stage washing tank for washing the finely pulverized plastic, and a drying means for drying the finely crushed plastic washed by the final stage washing tank, A waste plastic recycling apparatus comprising: the first-stage washing tank, the last-stage washing tank, and means for supplying neutralized washing water into the coarse crusher. Further reproduction apparatus of waste plastics according to claim 1, characterized in that it comprises a means allowed to form a water flow and circulated stage cleaning tank neutralizing wash water containing lime water of the first stage the washing bath. A process of roughly crushing waste plastic while adding neutralized washing water and lime water;
Washing the crushed and neutralized waste plastic lump with neutralized washing water containing lime water in the first-stage washing tank;
A step of pulverizing the plastic lump washed in the first-stage washing tank;
Washing the finely pulverized plastic with neutralized washing water in the final-stage washing tank;
Dehydrating and drying the pulverized and washed plastic;
A method for recycling waste plastics, comprising:

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