CN117884455A - Paper-plastic separator, papermaking waste residue separation system and process - Google Patents

Abstract

The invention belongs to the technical field of solid waste recovery, and relates to a paper-plastic separator, a papermaking waste residue separation system and a papermaking waste residue separation process. The paper-plastic separator comprises a shell and a rotor; the rotor comprises a main shaft penetrating through the inner cavity of the shell, a plurality of vertical cutters are uniformly arranged on the main shaft around the main shaft, and the vertical cutters circumferentially rotate in the shell from one end of the shaft to the other end of the shaft; one end of the shell is provided with a feed inlet; the bottom of the shell is provided with a water outlet; in the shell, a sieve plate is arranged below the rotor, and one end of the sieve plate, which is far away from the feed inlet, is provided with a discharge port; the shell and the main shaft are inclined downwards along the discharge end. According to the papermaking waste residue separation system, the sedimentation tank is arranged at the front end of the paper-plastic separator, heavy materials in the materials are quickly settled and discharged, and the materials are prevented from damaging the blades of the follow-up shredder.

Description

Paper-plastic separator, papermaking waste residue separation system and process

Technical Field

The invention belongs to the technical field of solid waste recovery, and particularly relates to a paper-plastic separator, a papermaking waste residue separation system and a papermaking waste residue separation process.

Background

The aim of the current papermaking solid waste material washing line treatment is to classify and recycle the components such as plastics, paper pulp, metal, sand and the like in the solid waste material, and the light plastics are recovered by rinsing, floating and the like. In the prior art, the process for recycling waste plastics by utilizing papermaking solid waste is generally shown in figure 1. Conveying papermaking solid waste to a shredder through a belt conveyor for shredding, wherein a magnetic separator is arranged on the belt conveyor, and can suck out part of iron components in raw materials, the shredded materials enter a paper-plastic separator, free paper pulp is separated out by the paper-plastic separator under the action of water and a rotor, the materials enter a rinsing separator for rinsing, and light plastics float on the liquid surface of the rinsing separator and are separated out from one end and enter a spin dryer for dehydration, so that regenerated plastic particles can be produced; and the material which is immersed into the water bottom by the rinsing separator forms sediment and is discharged from the other end.

The paper-plastic separator is a core device in the papermaking solid waste recovery process. The structure of the conventional paper-plastic separator in the prior art is shown in fig. 2, a rotor is arranged in a shell, and the rotor is provided with a plurality of groups of blades which are uniformly distributed along the rotor. The papermaking solid waste and flushing water enter the shell through the feed inlet, and the papermaking solid waste is rubbed by the blades and is washed by the flushing water along with the rotation of the rotor; pulp and water flow out from the sieve plate at the bottom, light plastic is discharged from the discharge hole at the upper end, and then enters the rinsing separator. The paper-plastic separator in the prior art has poor paper pulp separating effect, the paper pulp cannot be completely separated when being mixed in the plastic skin, and the excessive smoke can be caused in the subsequent production of regenerated plastic particles, thereby increasing the smoke treatment load.

In addition, although the magnetic separator can suck out part of iron components, massive iron materials, stainless steel and nonferrous metals cannot be sucked out. These materials present a significant threat to the shredder blades, potentially causing blade damage.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a paper-plastic separator, a papermaking waste residue separating device and a papermaking waste residue separating process. The paper-plastic separator can improve the separation efficiency of paper pulp and light plastic; the papermaking waste residue separation device and the papermaking waste residue separation process solve the problem that metal in papermaking solid waste damages equipment.

The specific technical scheme is as follows:

one of the objects of the present invention is to provide a paper-plastic separator comprising a housing and a rotor;

the rotor comprises a main shaft penetrating through the inner cavity of the shell, a plurality of vertical cutters are uniformly arranged on the main shaft around the main shaft, and the vertical cutters circumferentially rotate in the shell from one end of the shaft to the other end of the shaft;

One end of the shell is provided with a feed inlet;

the bottom of the shell is provided with a water outlet;

in the shell, a sieve plate is arranged below the rotor, and one end of the sieve plate, which is far away from the feed inlet, is provided with a discharge port;

The shell and the main shaft are inclined downwards along the discharge end.

When the device is used, papermaking solid waste and flushing water enter the shell from the feed inlet, are strongly kneaded in the shell, pulp flows out through the sieve plate under the high-speed centrifugal effect, and dehydrated and desized materials (plastic skins) are discharged from the discharge outlet. The vertical knife of the device is continuous, has long effective acting distance, has better dewatering and desizing effects compared with the traditional paper-plastic separator, remarkably improves the separation efficiency of paper pulp and plastic skin, and can prevent the paper pulp from being mixed in the plastic skin. Compared with the traditional paper-plastic separator, the pulp removal rate of the plastic skin is improved to more than 90% from the original 60%. Pulp removal = dry weight removed/(dry weight removed + dry weight of pulp mixed in plastic skin) x 100%. According to the invention, the rotor of the paper-plastic separator is provided with a plurality of structures which rotate circumferentially from the starting point to the finishing point of the independent shaft, so that compared with the traditional multi-group blades which are arranged in a straight line, the material dispersing effect is better, and the paper pulp and the plastic skin can be separated more effectively; and the motor load concentration can be avoided, so that the equipment operates more stably, and the working current is low. The machine body is in a front high and rear low form, and the materials can conveniently and smoothly descend under the action of the rotor and water flow.

Further, the vertical cutter is preferably rotated by 60-120 ° from one end to the other end of the shaft, and most preferably rotated by 90 °. The rotation angle of the vertical knife is an important factor influencing the material separation effect.

Further, the number of the vertical cutters is preferably 3 to 4, and most preferably 3.

Further, the vertical cutter is preferably made of alloy steel.

Further, the height of the vertical knife is preferably 60-120 mm, and the thickness of the top knife edge end is preferably 20-35 mm.

Furthermore, the knife edge end of the vertical knife is overlaid with wear-resistant materials, so that the service life of the rotor is prolonged. The wear-resistant material is preferably a stellite 6 alloy or a high-chromium welding rod.

Further, the cross section of the sieve plate is semicircular with an upward opening.

Further, the center of the main shaft is lower than the center of the semicircular sieve plate. The rotor and the semicircular sieve plate are arranged into a non-concentric structure, so that the center of the rotor is lower than the semicircular center of the sieve plate, the gap between the rotor vertical knife and the sieve plate is the minimum point when the rotor vertical knife rotates to the bottom, and the minimum gap between the rotor vertical knife and the bottom of the sieve plate is preferably 15-25 mm, thereby ensuring the kneading effect of materials at the bottom of the rotor and ensuring that the materials are repeatedly thrown up in larger spaces at two sides of the rotor.

Further, the housing and the main shaft are preferably inclined downward by 5 to 7 °, and most preferably 6 °.

Further, the shell comprises an upper shell and a lower shell, the feeding hole is formed in the upper shell, and the water outlet is formed in the lower shell.

Further, the paper-plastic separator also comprises a motor driving device for driving the rotor to rotate.

The invention also aims to provide a papermaking waste residue separation system comprising the paper-plastic separator, which sequentially comprises a strand shredder, a sedimentation tank, a first paper-plastic separator, a shredder, a rinsing separator and a second paper-plastic separator according to the movement direction of materials.

When the system is used, the twisted ropes in the papermaking solid waste are crushed by the twisted rope shredder and then are combined with the waste residue of the cylinder screen and the tailings of the rotary drum pulper, the mixed materials enter the settling tank under the action of flushing water flow with the pressure of about 2kg/cm ², heavy materials in the settling tank sink rapidly, and are discharged by the bottom slag scraper, so that the damage to blades of the subsequent shredder is avoided. The light material enters the first paper-plastic separator for desizing and dehydration under the action of water flow. The plastic skin after desizing and dewatering enters a shredder to be further shredded, and the blades of the shredder are protected because the materials are not heavy materials; the shredded plastic skin enters a rinsing separator for further rinsing, the sediment in the material is discharged and then enters a second paper-plastic separator for desizing and dehydration, and the sediment is packaged and transported outwards after desizing and dehydration; the plastic floating in the rinsing separator enters a spin dryer along with water flow, and after dehydration, clean plastic skin enters a packer for packing and outward transportation. The pulp obtained after dehydration and desizing is concentrated and enters a micro-filter for filtration, the pulp is recycled, and the filtered water enters a cleaning system for recycling.

Further, the strand breaker includes a first strand breaker and a second strand breaker. The second strand breaker is also preferably followed by a magnetic separator.

The strand is subjected to primary coarse breaking and then secondary breaking; the secondary crushing is fine crushing, so that subsequent equipment winding caused by overlong materials is avoided.

The invention also provides a papermaking waste residue separation method using the papermaking waste residue separation system, which comprises the following steps:

After being broken, the twisted ropes are combined with the waste residue of the cylinder screen or/and the tailings of the rotary drum pulper, and enter a precipitation tank under the action of water flow to remove heavy materials;

after heavy materials are removed, the light materials (floating materials) enter a first paper-plastic separator for desizing and dehydration;

The desized and dehydrated plastic skin enters a shredder to be shredded; then entering a rinsing separator for rinsing to obtain floating plastic skin and sediment; and (5) desizing and dewatering the sediment in a second paper-plastic separator.

Further, the strand breakage is divided into a primary strand breakage and a secondary strand breakage.

And further, after secondary breakage of the stranded ropes, removing iron by using a magnetic separator.

Further, the floating plastic skin obtained by rinsing the separator is dehydrated by a spin dryer.

Further, the pulp obtained after dehydration and desizing is concentrated and enters a micro-filter for filtration, the pulp is recycled, and the filtered water enters a papermaking waste residue separation system for recycling.

Further, the sediment desilted and dehydrated that the rinsing separating centrifuge obtained is deironing through the magnet separator.

The beneficial effects of the invention are as follows:

compared with the traditional structure, the paper-plastic separator has the advantages of good material dispersing effect, better dewatering and desizing effects, high separation efficiency of paper pulp and plastic skin, and capability of preventing the paper pulp from being mixed in the plastic skin. The pulp removing rate of the plastic skin is improved to more than 90% from the original 60%. By adjusting the positions of the rotor and the sieve plate, the kneading effect of materials at the bottom of the rotor is ensured, and the materials are repeatedly thrown up in a larger space at two sides of the rotor. According to the papermaking waste residue separation system, the sedimentation tank is arranged at the front end of the paper-plastic separator, heavy materials in the materials are quickly settled and discharged, and the materials are prevented from damaging the blades of the follow-up shredder.

Drawings

FIG. 1 is a schematic flow chart of a process for recycling waste plastics from papermaking solid wastes in the prior art;

FIG. 2 is a schematic diagram of a prior art paper-plastic separator;

FIG. 3 is a schematic front sectional view of a paper-plastic separator in example 1 of the present invention;

FIG. 4 is a schematic cross-sectional view taken along the direction A-A in FIG. 3;

FIG. 5 is a schematic flow chart of a papermaking sludge separation system and method in example 2 of the present invention.

In the figure: 1. a main shaft; 2. a vertical cutter; 3. a sieve plate; 4. an upper housing; 5. a lower housing; 6. A lower support; 7. a discharge port; 8. a feed inlet; 9. and a water outlet.

Detailed Description

The principles and features of the present invention are described below in connection with examples, which are set forth only to illustrate the present invention and not to limit the scope of the invention.

Example 1

A paper-plastic separator, as shown in fig. 3 and 4, comprises a shell and a rotor;

The rotor comprises a main shaft 1 penetrating through the inner cavity of the shell, the outer diameter of the main shaft 1 is phi 325mm, three vertical cutters 2 are uniformly arranged on the main shaft 1 around the main shaft, and the vertical cutters 2 circumferentially rotate for 90 degrees in the shell from one end of the shaft to the other end of the shaft; the vertical knife is made of alloy steel, the height of the vertical knife 2 is 80mm, and the thickness of the top knife edge end is 30mm; the edge end is overlaid with stellite 6 alloy with the height of 5 mm;

The shell consists of an upper shell 4 and a lower shell 5, and a feed inlet 8 is arranged at the upper part of one end of the upper shell 4; the bottom of the lower shell 5 is provided with a water outlet 9; the shell is supported by a lower support 6; the length of the inside of the housing is 5m.

In the shell, a sieve plate 3 is arranged below the rotor, and the cross section of the sieve plate 3 is semicircular with an upward opening; the inner diameter of the semicircular sieve plate 3 is phi 600mm; one end of the sieve plate 3 far away from the feed inlet 8 is provided with a discharge outlet 7;

the center of the main shaft 1 is lower than the center of the semicircular sieve plate 3; the center of the main shaft 1 and the center of the screen plate 3 are positioned on the same vertical plane; the minimum clearance between the rotor upper vertical cutter 2 and the sieve plate is 20mm when the rotor upper vertical cutter rotates to the bottom;

the shell and the main shaft 1 are inclined downwards by 6 degrees along the discharge end;

The paper-plastic separator also comprises a motor driving device for driving the rotor to rotate.

When the device is used, the motor driving device drives the rotor to rotate, paper making solid waste and flushing water enter the shell from the feed inlet 8 and are strongly rubbed in the shell, paper pulp flows out through the sieve plate 3 under the high-speed centrifugal effect, and dehydrated and desized materials (plastic skins) are discharged from the discharge outlet 7. The slurry content of the raw materials is generally 10-25%, and the slurry content after dehydration and desizing is 1-2%.

Example 2

Referring to embodiment 1, the difference from embodiment 1 is that the stand knife 2 is rotated by 30 ° circumferentially from one end to the other end of the shaft in the housing.

Example 3

Referring to embodiment 1, the difference from embodiment 1 is that the stand knife 2 is rotated by 60 ° circumferentially from one end to the other end of the shaft in the housing.

Example 4

Referring to embodiment 1, the difference from embodiment 1 is that the stand knife 2 is rotated by 120 ° circumferentially from one end of the shaft to the other end within the housing.

Example 5

Referring to embodiment 1, the difference from embodiment 1 is that the stand knife 2 is rotated 180 ° circumferentially from one end of the shaft to the other end within the housing.

Example 6

Referring to embodiment 1, the difference from embodiment 1 is that two vertical blades 2 are uniformly disposed around the main shaft 1.

Example 7

Referring to example 1, the difference from example 1 is that four vertical blades 2 are uniformly disposed around the main shaft 1.

Example 8

Referring to example 1, the difference from example 1 is that five vertical blades 2 are uniformly disposed around the main shaft 1.

Testing

Examples 1-8 were tested for their paper-plastic separation effect on paper solid waste. The experimental conditions are as follows: the motor power is 90kW, the rotor rotating speed is 700rpm, and the paper-plastic separation test is carried out by using the same batch of paper-making solid waste. The test results are shown in Table 1. Pulp removal = dry weight removed/(dry weight removed + dry weight of pulp mixed in plastic skin) x 100%.

Table 1 comparison of paper-Plastic separation effects

	Number of vertical cutters	Angle of rotation of vertical knife	Operating current A	Material residence time s	Pulp removal rate
						Example 1	3	90°	145A	25s	≥95%
Example 2	3	30°	180A	30s	≥87%
						Example 3	3	60°	165A	28s	≥90%
Example 4	3	120°	125A	22s	≥85%
						Example 5	3	180°	100A	20s	≥75%
Example 6	2	90°	100A	30s	≥80%
						Example 7	4	90°	165A	20s	≥85%
Example 8	5	90°	180A	15s	≥75%

As can be seen from the results in Table 1, the present invention achieves a higher pulp removal rate. Of these, example 1 had the highest pulp removal rate. It should be noted that example 2, while achieving a higher pulp removal rate, has a higher run current and a longer material residence time.

Example 9

A papermaking waste residue separation system comprises a paper-plastic separator in the embodiment 1, as shown in fig. 5, and sequentially comprises a first strand shredder, a second strand shredder, a magnetic separator, a leveling roller, a sedimentation tank, a first paper-plastic separator, a shredder, a rinsing separator and a second paper-plastic separator according to the movement direction of materials; the rinsing separator is connected with the spin dryer.

The papermaking waste residue separation is carried out by using the papermaking waste residue separation system, as shown in fig. 5, and the steps are as follows:

After roughly crushing the twisted ropes in the paper making solid waste through a first twisted rope shredder, conveying the crushed ropes to a second twisted rope shredder through a belt conveyor, and finely crushing the ropes; after deironing through the magnetic separator, the heavy materials are quickly sunk in the settling tank under the action of flushing water flow of pressure of 2kg/cm ² after being evenly mixed by a material homogenizing roller and then are mixed with the waste residue of the cylinder screen and the tailings of the rotary drum pulper, and the heavy materials are discharged by a bottom slag scraper, so that the damage to blades of the follow-up shredder is avoided.

After heavy materials are removed, the light floating materials enter a first paper-plastic separator for desizing and dehydration under the action of water flow.

The desized and dehydrated plastic skin enters a shredder to be further shredded; the shredded plastic skin enters a rinsing separator for further rinsing to obtain floating plastic skin and sediment; the sediment is discharged by a sediment scraping device at the bottom and then enters a second paper-plastic separator for desizing and dehydration, and the sediment is desized and dehydrated, and is packaged and transported after being deironized by a magnetic separator; the plastic skin floated by the rinsing separator enters a spin dryer along with water flow, and the dehydrated clean plastic skin enters a packer for packing and selling.

The pulp obtained after dehydration and desizing is concentrated and enters a micro-filter for filtration, and the pulp is recycled and goes to a pulping workshop; the filtered water enters a papermaking waste residue separation system for recycling.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (9)

1. The paper-plastic separator is characterized by comprising a shell and a rotor;

The rotor comprises a main shaft (1) penetrating through the inner cavity of the shell, a plurality of vertical cutters (2) are uniformly arranged on the main shaft (1) around the main shaft, and the vertical cutters (2) circumferentially rotate in the shell from one end of the shaft to the other end of the shaft;

one end of the shell is provided with a feed inlet (8);

the bottom of the shell is provided with a water outlet (9);

A sieve plate (3) is arranged below the rotor in the shell, and a discharge port (7) is arranged at one end of the sieve plate (3) far away from the feed port (8);

The shell and the main shaft are inclined downwards along the discharge end.

2. The paper-plastic separator according to claim 1, wherein the vertical cutter (2) circumferentially rotates by 60-120 ° from one end of the shaft to the other end.

3. The paper-plastic separator according to claim 1, wherein the number of the vertical cutters (2) is 3-4.

4. A separator according to claim 1, characterized in that the cross section of the screen plate (3) is semicircular with an upward opening.

5. The paper-plastic separator according to claim 4, wherein the center of the main shaft (1) is lower than the center of the semicircular sieve plate (3).

6. The paper-plastic separator according to claim 1, wherein the housing and the main shaft (1) are inclined downward by 5-7 °.

7. The paper-plastic separator according to claim 1, further comprising a motor driving device for driving the rotor to rotate.

8. A papermaking waste residue separation system, comprising the paper-plastic separator according to any one of claims 1-7, and sequentially comprising a strand shredder, a sedimentation tank, a first paper-plastic separator, a shredder, a rinsing separator and a second paper-plastic separator according to the movement direction of materials.

9. A method for separating papermaking waste residues, which uses the papermaking waste residue separation system as claimed in claim 8, and is characterized by comprising the following steps:

After being broken, the twisted ropes are combined with the waste residue of the cylinder screen or/and the tailings of the rotary drum pulper, and enter a precipitation tank under the action of water flow to remove heavy materials;

removing heavy materials, and then, entering a first paper-plastic separator for desizing and dewatering;

The desized and dehydrated plastic skin enters a shredder to be shredded; then entering a rinsing separator for rinsing to obtain floating plastic skin and sediment; and (5) desizing and dewatering the sediment in a second paper-plastic separator.