TWI504795B - Waste paper recycling system - Google Patents

Description

Paper waste recycling system (2)

The present invention relates to papermaking waste, and more particularly to a papermaking waste recycling system for separating plastics and paper stock from papermaking waste.

At present, a large proportion of raw materials for the paper industry come from recycled waste paper. Some of these waste papers are composite materials combining paper and plastic or aluminum foil coated with paper, polyethylene (PE) film and aluminum foil. The material of the material or the foil package is very tightly combined, and the ordinary separation process cannot be completely separated, so it can only be used as pulp waste. For the treatment of pulp waste, the traditional way is incineration or landfill, which not only pollutes the environment, but also is a waste of resources.

At present, there is a separation equipment, which uses the process flow shown in the first figure to pulverize, precipitate, filter, float, etc. the waste paper mixed waste discarded by the paper mill to remove impurities (including stones and metals). The wood, cotton yarn, and sediment are separated, and the pulp and plastic are separated. The pulp can be sent back to the paper mill, and the plastic can be re-granulated into plastic raw materials.

The specific method is: first use the quantitative belt scale 1 to transfer the wet pulp residue (including a small amount of paper, plastic, magnetic metal and non-magnetic metal, stone, sand, wood and other wastes) from the pulp mill. The speed is fed into the trommel 2, the inlet end of which is slightly above the outlet end, with the feed being slowly rotated. Among them, a part of the debris will fall on the collecting belt conveyor 3, and then transported to the drum screening waste bin 4, and the remaining larger scrap will fall from the outlet end of the drum screen 2 into the connecting belt conveyor 5 Into the pulverizer 6, the pulverizer 6 is provided with spray water, and the large pieces of debris are pulverized into small pieces, and then enter the open type separator 7, and one side is sprayed with water while stirring with a screw feed rod. And feeding.

Then, after being output from the open separator 7, the pulverized and stirred mixed impurities enter the pulper 8 for vigorous stirring and precipitation, and the heavier sand and metal are precipitated to the bottom and passed through the pulper 8 The double gate valve is discharged to the pulper waste bin 9, and the lighter mixed debris containing a large amount of plastic is output from above the slurry machine 8 and enters the second pulverization process; the pulverizer 10 remixes the mixed debris After the pulverization, the open separator 11 is again introduced, and the mixed impurities are sent to the flotation tank 12 while being sprayed, stirred, and conveyed; the flotation tank 12 is provided with a plurality of sub-tanks, and the water level of each sub-tank is sequentially lowered. The impurities containing PP, PE and OPP plastics are lighter and can float on the water surface, while the heavy ones containing PVC and PET plastics gradually sink to the bottom of the tank. Wherein, the floating object is beaten once every fall when the sub-grooves with different heights of different levels fall, so that the separation of the paper fiber and the plastic mixture can be achieved.

Further, the mixture of the precipitate at the bottom of each sub-tank of the flotation cell is sucked by the suction pump 13 driven by the vacuum pump, and the movement of the suction pipe 13 is performed manually. Then, the PP, PE, and OPP plastic which are floated in the last sub-tank are sent to the silo 15 through the open separator 14, and then recycled to the plastic raw material by the plastic granulator 16. The PVC and PET mixture that sinks to the bottom of the tank is pressed into a plastic rod (strip) that can be used as boiler fuel.

The above separation equipment still has the following problems: the primary selection process is too simple, the primary selection efficiency is low, and the impurities in the raw materials are not sufficiently separated, which brings great difficulty to the subsequent flotation treatment.

In view of the above, the present inventors have made an effort to improve and solve the above-mentioned deficiencies, and to study and cooperate with the application of the theory, and propose a present invention which is reasonable in design and effective in improving the above-mentioned defects.

An object of the present invention is to provide a papermaking waste recycling system capable of separating plastics and paper materials in wastes and achieving resource recovery.

In order to achieve the above object, the present invention is a paper waste recycling system for separating plastics, paper stocks and waste materials, comprising: a pulper for dispersing pulp fibers; and for precipitating and sorting from a pulper A row of slag heavy slag barrels, which are disposed after the pulper; and a washing and sorting machine for sorting the second slag from the heavy slag bucket, which is disposed behind the heavy slag bucket. The paper waste recycling system of the invention can completely separate the plastic and the paper material in the waste, and improve the recovery rate of the paper fiber and the purity of the recycled plastic.

The detailed description and technical content of the present invention are set forth in the accompanying drawings.

Please refer to the second figure, which is a schematic diagram of a papermaking waste recycling system according to an embodiment of the present invention. The papermaking waste recovery system 200 of the present embodiment for treating and separating plastic, paper stock and waste material comprises: a pulper 202 for dispersing pulp fibers; for precipitating and sorting the first slag from the pulper 202 The heavy slag bucket 204 is disposed behind the pulper 202; and a washing and sorting machine 206 for sorting the second slag from the heavy slag bucket 204, which is disposed behind the heavy slag bucket 204. The proportion of plastics, paper stocks and waste materials in papermaking waste is the smallest in plastics, the second in paper and the largest in scrap.

The papermaking waste is sufficiently dispersed by being fed into the pulper 202 by, for example, a chain conveyor (not shown). The paper waste is allowed to stand for a period of time after being dispersed, and the first slag in the slurry machine 202 is pumped to the inclined net 2022 by a pump 2021 for filtering, separating the fibers in the papermaking waste, and the fibers are transported to the pulping system. The screen unit 207 is used to increase the fiber content of the pulp in the pulping system, and the separated water is returned to the slurry machine 202.

The heavy slag bucket 204 receives the first light slag from the pulper 202 and the second light slag from the heavy slag bucket 204 is discharged to the washing and sorting machine 206. The second light slag sorted by the heavy slag bucket 204 is conveyed to the washing and sorting machine 206 by, for example, a screw conveyor 2041. In addition, pulverization can be further performed by the pulverizer 2042 before entering the washing and sorting machine 206 to obtain a smaller waste size. The waste pulverized by the pulverizer 2042 is sent to the washing and sorting machine 206 via the belt conveyor 2045.

The washing and sorting machine 206 includes a body 2061 and four sets of dialing devices 2062, 2063, 2064, and 2065. The number and size of the dialed devices can be determined according to the needs, and there is no limit. The body 2061 can be filled with water, and a feeding port 2066 is provided on one side of the upper section for the waste to be input therefrom, and a discharge port 2067 is provided on the other side of the upper section. The dialing devices 2062, 2063, 2064, and 2065 are driven to rotate by a motor (not shown) provided outside the main body 2061, and are horizontally arranged side by side at a water surface position filled in the inside of the main body, and a part is immersed in water.

When the waste enters the interior of the body 2061 from the inlet 2066 of the washing and sorting machine 206, the lighter-weight waste floats on the surface of the water, and is dialed by the horizontally-arranged dialing devices 2062, 2063, 2064, 2065. During the advancement process, part of the waste originally attached to the surface and the heavier specific gravity can be separated and fall into the water, and finally the third light slag which is lighter in weight of the washing and sorting machine 206 passes through, for example, a mesh-shaped discharge conveyor belt. (SUS304) 2068 is discharged to the dewatering machine 208 for dehydration, and then sent to the cyclone separation tank 209 to discharge and separate the air, and finally discharged from the discharge port of the cyclone separation tank 209 to a storage tank (not shown) for storage.

The second intermediate slag in the middle layer of the heavy slag tank 204 and the third medium slag in the middle layer of the washing and sorting machine 206 are discharged to the secondary pulverizer 210 to disperse the pulp fibers, and then the fourth light slag on the upper layer of the secondary pulverizer 210 The fiber quality is returned to the pulper 202 for recycling, or the fibers are separated by a cylindrical screen 212, and the fibers are conveyed to a pulping system coarse screen unit 207 to increase the fiber content of the pulp in the pulping system.

The fourth heavy slag of the lower layer of the secondary pulverizer 210 is output to the slag sump 214 to filter out the water, and then discharged to the regenerative fuel (RDF) granulator 216.

The first heavy slag in the lower layer of the slurry machine 202 is discharged through the double gate valve 2023, and the second heavy slag in the lower layer of the heavy slag tank 204 is discharged through the double gate valve 2043. The first heavy slag in the lower layer of the slurry machine 202 and the second heavy slag in the lower layer of the heavy slag tank 204 are discharged and sent to the regenerative fuel (RDF) granulator 216 via, for example, a screw conveyor 2044, and processed into fuel. In addition, a belt conveyor 218 can be additionally disposed between the screw conveyor 2044 and the regenerative fuel (RDF) granulator 216. Above the belt conveyor 218, a magnetic separator 220 is disposed in the magnetic range, and the magnetic separator 220 is used for separating the waste. Magnetic metal. The third heavy slag of the washing and sorting machine 206 is discharged and sent to a regenerative fuel (RDF) granulator 216 via, for example, a screw conveyor 2069, and processed into a fuel.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and other equivalent variations of the patent spirit of the present invention are all within the scope of the invention.

1. . . Quantitative belt scale

2. . . Tray screen

3. . . Collecting belt conveyor

4. . . Tray screen waste bin

5. . . Continuous belt conveyor

6. . . grinder

7. . . Open separator

8. . . Slurry machine

9. . . Slurry waste bin

10. . . grinder

11. . . Open separator

12. . . Flotation tank

13. . . straw

14. . . Open separator

15. . . Silo

16. . . Plastic granulator

200. . . Paper waste recycling system

202. . . Slurry machine

2021. . . Pump

2022. . . Oblique net

2023. . . Double gate valve

204. . . Heavy slag bucket

2041. . . Screw conveyor

2042. . . grinder

2043. . . Double gate valve

2044. . . Screw conveyor

2045. . . Belt conveyors

206. . . Washing sorter

2061. . . Ontology

2062. . . Dial device

2063. . . Dial device

2064. . . Dial device

2065. . . Dial device

2066. . . feed inlet

2067. . . Outlet

2068. . . Mesh discharge conveyor

2069. . . Screw conveyor

207. . . Pulping system coarse screening unit

208. . . Dehydrator

209. . . Cyclone separation bucket

210. . . Secondary pulper

212. . . Cylinder sieve

214. . . Slag bath

216. . . Regenerated fuel granulator

218. . . Belt conveyors

220. . . Magnetic separator

The first figure is a schematic diagram of a conventional recovery system for extracting plastic from pulp waste.

The second figure is a schematic diagram of a papermaking waste recycling system according to an embodiment of the present invention.

200. . . Paper waste recycling system

202. . . Slurry machine

2021. . . Pump

2022. . . Oblique net

2023. . . Double gate valve

204. . . Heavy slag bucket

2041. . . Screw conveyor

2042. . . grinder

2043. . . Double gate valve

2044. . . Screw conveyor

2045. . . Belt conveyors

206. . . Washing sorter

2061. . . Ontology

2062. . . Dial device

2063. . . Dial device

2064. . . Dial device

2065. . . Dial device

2066. . . feed inlet

2067. . . Outlet

2068. . . Mesh discharge conveyor

2069. . . Screw conveyor

207. . . Pulping system coarse screening unit

208. . . Dehydrator

209. . . Cyclone separation bucket

210. . . Secondary pulper

212. . . Cylinder sieve

214. . . Slag bath

216. . . Regenerated fuel granulator

218. . . Belt conveyors

220. . . Magnetic separator

Claims (8)

A paper waste recycling system for treating paper waste containing plastic, paper stock and waste, the system comprising: a pulper for dispersing pulp fibers; and a heavy slag bucket for sedimentation and sorting from the a first slag of the pulping machine, which is disposed behind the pulper; a washing and sorting machine for sorting the second slag from one of the heavy slag buckets, which is disposed behind the heavy slag bucket The washing and sorting machine comprises a body and an array dialing device, wherein the body is filled with water, and the dialing devices are driven by a motor disposed outside the body to be horizontally juxtaposed in the body. a portion of the surface of the filling surface, and a portion of which is immersed in water; and a slanted net for filtering the first slag of one of the pulpers. The papermaking waste recycling system of claim 1, wherein the proportion of the plastic, the paper stock and the waste material is the smallest, the paper material is the second largest, and the waste material is the largest. The paper waste recycling system according to claim 1, wherein the heavy slag bucket receives the first light slag from one of the pulpers, and the second light slag of one of the heavy slag buckets is discharged to the washing and sorting machine. . The papermaking waste recycling system of claim 3, further comprising a pulverizer for pulverizing the second light slag to the washing and sorting machine. The papermaking waste recycling system of claim 1, wherein the third light slag of the washing and separating machine is discharged to a dewatering machine for dehydration. The papermaking waste recycling system according to claim 1, wherein the second slag of one of the heavy slag buckets and the third slag of the one of the washing and separating machines are discharged to a secondary pulper for dispersing pulp fibers, Thereafter, the fourth light slag of one of the secondary pulverizers is returned to the pulverizer for recycling. The papermaking waste recycling system according to claim 6, wherein the fourth heavy slag of the secondary pulverizer is outputted to a slag sump to filter out moisture, and then discharged to a regenerative fuel granulator. The papermaking waste recycling system according to claim 7, wherein the first heavy slag of one of the pulpers, the second heavy slag of one of the heavy slag buckets, and the third heavy slag of one of the washing and separating machines are discharged to The regenerative fuel granulator.