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With the development of office automation, the number of office waste papers is increasing. Because office waste paper is composed of inkjet printing, laser printing, and electrostatic copy paper, all of them are made of high-quality chemical wood pulp, which not only has high whiteness. , And the strength is good, so the use value is very high. However, the printing format of office waste paper is different from traditional printing, and the removal of these inks is also relatively difficult. The 150T/D mixed office waste paper processing line newly digested and developed by our institute adopts a method of screening, deinking, reheating, and high-concentration dispersion after pulverization to reduce the particle size of the ink to the range removed by flotation and washing. , Then by bleaching, secondary flotation, washing and removal to obtain a clean slurry. The yield of the secondary fiber slurry obtained by such treatment is greater than 75% and the whiteness is above 80 degrees.
A simple process flow:
(1) High-consistency hydraulic disintegration system waste paper is disintegrated at 12-16% concentration in a high-consistency hydraulic pulper, then diluted to 4-5%, pre-screened by a roughing machine, and the good slurry enters the unloading tank. After the coarse pulp was further treated by the cylindrical screen, the good fibers were returned to the hydraulic pulper and the coarse slag was removed. The characteristics of this system are: discharging pulp and removing impurities at the same time, keeping the pulper tank clean, obtaining pre-screened pulp, shortening the pulping cycle, and increasing the capacity of the disintegration system.
(2) High and medium de-sanding screening system The slurry is pumped from the unloading tank through the concentration adjustment and 3-4% pumped into the high-concentrate slag remover to remove various heavy debris in the slurry (such as metal fragments, nuts, and staples) Staples, round needles, etc.), then through a vertical pressure screen (hole sieve) for rough screening, and the ready-to-drinking slurry is diluted to a concentration of about 1.5% into the medium-consistency cleaner for further slag removal, and the coarse pulp is subjected to flotation cleaning machine. After removing the light impurities and heavy impurities, it is returned to the high-concentrate cleaner. The slurry of the medium-concentrate cleaner is directly sent to the vertical pressure screen (slit screen) for the fine screening system. The fine screening system has three outflow pressure screens. . Features: The coarse screening system can remove most of the light and heavy impurities in the pulp, and the fiber loss is small. The quality of the waste paper raw materials is now reduced. The high and medium concentration cleaners are used to remove the slag to protect the screening equipment and the fine screen. The treatment concentration is above 1.5%, so the efficiency of this system is relatively high.
(3) The flotation deinking system slurry enters the laminar flotation deinking system at a concentration of about 1%. The first flotation uses five flotation units, and the second flotation uses four flotation units. The flotation effect of the selected system is good, the fiber loss is small, the area is saved, the production capacity is high, and it is easy to control.
(4) Thermal Dispersion System After the slurry has passed one flotation, it is decontaminated by a light cleaner and a heavy slag remover (concentration is about 0.7-0.8%), and is condensed by a garden net thickener and a screw extruder. To a concentration of 28-30%, the two-roller heat disperser was introduced into the roll at a concentration of about 25% through a mixing screw conveyor. The thermal disperser does not cut the fibers under high shearing conditions to reduce the size of the contaminant particles, so that it can be removed by washing and secondary flotation in the subsequent sequence. The production capacity is large and the dispersion effect is good. In this system, the hydrogen peroxide solution is added at the same time, and the thermal disperser simultaneously performs a bleaching mixing action. Considering the characteristics of the mixed office waste paper, the heat dispersion temperature here is about 7O°C.
Second, the main equipment overview 1, 30 Limi high-consistency hydraulic pulper using a specially designed three-headed spiral rotor, the rotor rotation, the pulp tank slurry production from the center to the week and again from the park to the center and from top to bottom From the bottom to the top of the synthetic ideal flow, in the high-concentration conditions, the slurry has a strong friction and rubbing effect, has a strong ability to disintegrate, the ink particles from the fiber is also very effective peeling, its high concentration solution Concentration of 12-16%, up to 18%, which can save steam, chemicals, power consumption, etc., while producing less small fibers, pulp into a high intensity, high whiteness, the device design rotor diameter φ1905, Speed ​​143rPm, tank diameter φ4600, power 500kw.
2. The roughing machine adopts a low-friction four-blade hydraulic rotor, and the back design has the function of self-cleaning sieve plate, so that the discharged slurry can be evenly dispersed, and the sieve plate is not blocked, and impurities are prevented from being broken. The housing is tilted upwards to keep the rotor from being damaged by heavy impurities and the entire transmission can be moved back. In order to maintain the rotor and screen plate, the equipment is designed to reach a slurry concentration of 4-5%, a rotor diameter of φ1220, a sieve aperture of φ6, and a power of 75kw.
3, high, medium thick cleaner
The slag skimmer uses a free vortex principle and can effectively remove heavy impurities in various types of pulp. The slurry enters the slag remover at a specific angle from the tangential direction, and the centrifugal force is generated when the slurry flow moves toward the slag discharge port along the inner wall in a spiral manner. The impurities in the slurry such as gravel and metal blocks are in the centrifugal force. It is thrown into the inner wall under the action, and discharged downwards from the lower port into the sediment chamber. In the sediment chamber, the slurry is further cleaned, the fibers are recovered, and the waste residue is deposited on the bottom of the slag chamber. The slurry is spiraled upwards. The top of the slag cooler discharges. The cone part is composed of an outer steel shell and an upper and lower two-stage cone of ceramic material. The upper cone is a centrifugal deslagging zone. The upper cross section of the lower cone is a square, and the lower cone is a circle. The coarse slag separated by the cone flows into the lower cone and is gradually decelerated and cleaned. The coarse slag sinks into the sediment chamber and the fiber is returned to the pulp stream, so the fiber loss is low, and the entire slag remover will not be blocked. The high-concentrate slag cleaner has a throughput of 7500-1000 OL/min, a slurry concentration of 3%-6%, a medium-density slag cleaner, a throughput of 5000-7500 L/min, and a slurry concentration of 1%-2%.
4, vertical pressure screen
With the up-flow structure design, the bottom of the slurry enters the slurry, the light impurities and the air in the slurry rise naturally to the top slagging port and rapidly exit the machine, and the heavy impurities settle to the bottom to discharge, greatly reducing the possibility of rotor and screen drum damage. The upflow structure also eliminates the eddy currents that cause the screen body to vibrate, oscillate and stress. The sectional housing is used to adjust the outlet direction of the slurry. The coarse screen adopts a closed non-winding type rotor, and the rotor blades can be replaced after being worn without changing the entire rotor. Fine-screen rotor rotor, preferably rotor structure shape, choose a reasonable choice of speed, produce positive and negative pulse, to achieve the purpose of self-cleaning sieve (slit). Use rippled sieve plates to increase production and improve screening efficiency.
1 Rough sieve: Nominal screening area (hole sieve): 1.2m2
Sieve concentration: 3-4%
Rotor diameter: φ600
Equipped with motor power: 110kW
2 fine screen: Nominal screening area: 3m2
Sieve concentration: 1-2%
Rotor diameter: φ910
With motor power: 160kw
3 fine screen two sieve: nominal screening area 0.8m2
Sieve concentration: 1-2%
Rotor diameter: φ600
Equipped with motor power: 37kW
5. The heat disperser heat disperser adopts the double-roller structure, which uses the reverse rotation of two rollers at different speeds to generate shearing and mixing. It adopts low rotation speed, large rotor clearance, avoids fiber cutting, and has a long working time (about 3 minutes). ), and achieve high shear. Ensure that the slurry is fully processed to obtain the best eye effect. Mechanical structure, the use of motor reducer directly connected to two parallel gears, two parallel shafts are equipped with a plurality of gear rings, the position is staggered to ensure that there is a certain gap, and in the disperser shell is also equipped with a certain arrangement of teeth, The arrangement of the tooth shape arrangement achieves the purpose of kneading and dispersing while the slurry is forwarded to the discharge port. When the slurry concentration is about 30%, the dispersion effect is the best. Thermal disperser roller diameter φ63O, with motor power 750kw.
6, flotation sieve machine
The structure of the device is similar to a closed vertical hydraulic pulper. After the slurry enters the tank, a strong eddy current is generated due to the rotation of the bottom rotor, so that the light weight is concentrated in the low pressure area of ​​the center of the vortex, and the top is designed as a curved surface. Shape, and set the tailings outlet in the center; the rotor rotates to make the slurry more descrease, and the outside of the sieve plate is provided with a groove, so that heavy impurities under the action of centrifugal force are deposited into the groove, and then discharged through heavy impurities, extending Rotor and screen life. Design into pulp concentration: <2%, into the pulp pressure 250Kpa-500Kpa, with power: 55kw.
7. The flotation deinking machine slurry sucks air through a manifold-shaped jet, then mixes it into the first unit into the slurry port through the mixing chamber, enters the first unit for flotation, and then discharges from the discharge port, and then pumps the incident. The flow device is mixed with air, and the flotation device is fed into the second unit to feed the slurry, and so on. According to the actual condition of the slurry, three to five flotation units can be set. Each unit is connected, so that the control is convenient. By calculation, the degree of turbulence in the flotation zone is controlled to achieve the best deinking effect. This device has a good and stable removal effect on ink particles and gel substances in a wide range of sizes. This type of deinking tank is used. Made of stainless steel, fully enclosed, so the environment is relatively good, in addition to the maintenance pump pump work, the power consumption is lower than the vertical flotation tank, flotation tank diameter of φ6650mm. Flotation slurry concentration is about 1%.
8, low concentration cleaner
Using the principle of centrifugal force, fine heavy impurities such as sand and dust in the slurry are removed, and large ink particles and the like are removed. The slag remover has high efficiency, small amount of tailings, reduced pressure, and large throughput. Each scraper inlet and outlet valve is equipped with a valve to reduce system downtime, increase system flexibility and reliability, the system can be based on the actual situation of closed or open two. The material of the dross cleaner is stainless steel. There are two kinds of precision casting and welding according to the use conditions. In the waste paper pulping system, the stainless steel casting is generally used, and the stainless steel pressure welding structure is used for the flow delivery system of the paper machine. The main parameters used are: throughput 600-70OL/min, feed concentration 0.7-0.77%, feed pressure 275-310Kpa, discharge pressure 25-60Kpa.
9, multi-disk vacuum filter
Multi-disc filter is the preferred equipment for white water recovery and pulp concentration. Our latest design of more than 200 disc vacuum filters consists of 12 φ3500 and filter discs. Each disc is divided into 16 discs with different sizes. It is mounted on a hollow shaft with a disc base, and the hollow shaft is also divided into 16 segments. Axial channels that do not communicate with each other. The slurry enters the slurry tank from the mixing tank. Through the filtration, the fibers and other solids in the slurry are adsorbed on the filter screen of the sector plate. As the disk rotates, the filter layer is thickened, and the liquid passes through the filter layer and the filter mesh. Into the fan-shaped plate flow channel, into the hollow shaft, from the dispensing valve end of the hollow shaft out of the turbid liquid and clear liquid in two parts. As the disc continues to rotate, the filter layer turns out of the slurry liquid level. As the atmosphere is switched on, the sector plate vacuum disappears. The pressure water strips the filter layer slurry from the sector plate surface and falls into the slurry material tank.
A simple process flow:
(1) High-consistency hydraulic disintegration system waste paper is disintegrated at 12-16% concentration in a high-consistency hydraulic pulper, then diluted to 4-5%, pre-screened by a roughing machine, and the good slurry enters the unloading tank. After the coarse pulp was further treated by the cylindrical screen, the good fibers were returned to the hydraulic pulper and the coarse slag was removed. The characteristics of this system are: discharging pulp and removing impurities at the same time, keeping the pulper tank clean, obtaining pre-screened pulp, shortening the pulping cycle, and increasing the capacity of the disintegration system.
(2) High and medium de-sanding screening system The slurry is pumped from the unloading tank through the concentration adjustment and 3-4% pumped into the high-concentrate slag remover to remove various heavy debris in the slurry (such as metal fragments, nuts, and staples) Staples, round needles, etc.), then through a vertical pressure screen (hole sieve) for rough screening, and the ready-to-drinking slurry is diluted to a concentration of about 1.5% into the medium-consistency cleaner for further slag removal, and the coarse pulp is subjected to flotation cleaning machine. After removing the light impurities and heavy impurities, it is returned to the high-concentrate cleaner. The slurry of the medium-concentrate cleaner is directly sent to the vertical pressure screen (slit screen) for the fine screening system. The fine screening system has three outflow pressure screens. . Features: The coarse screening system can remove most of the light and heavy impurities in the pulp, and the fiber loss is small. The quality of the waste paper raw materials is now reduced. The high and medium concentration cleaners are used to remove the slag to protect the screening equipment and the fine screen. The treatment concentration is above 1.5%, so the efficiency of this system is relatively high.
(3) The flotation deinking system slurry enters the laminar flotation deinking system at a concentration of about 1%. The first flotation uses five flotation units, and the second flotation uses four flotation units. The flotation effect of the selected system is good, the fiber loss is small, the area is saved, the production capacity is high, and it is easy to control.
(4) Thermal Dispersion System After the slurry has passed one flotation, it is decontaminated by a light cleaner and a heavy slag remover (concentration is about 0.7-0.8%), and is condensed by a garden net thickener and a screw extruder. To a concentration of 28-30%, the two-roller heat disperser was introduced into the roll at a concentration of about 25% through a mixing screw conveyor. The thermal disperser does not cut the fibers under high shearing conditions to reduce the size of the contaminant particles, so that it can be removed by washing and secondary flotation in the subsequent sequence. The production capacity is large and the dispersion effect is good. In this system, the hydrogen peroxide solution is added at the same time, and the thermal disperser simultaneously performs a bleaching mixing action. Considering the characteristics of the mixed office waste paper, the heat dispersion temperature here is about 7O°C.
Second, the main equipment overview 1, 30 Limi high-consistency hydraulic pulper using a specially designed three-headed spiral rotor, the rotor rotation, the pulp tank slurry production from the center to the week and again from the park to the center and from top to bottom From the bottom to the top of the synthetic ideal flow, in the high-concentration conditions, the slurry has a strong friction and rubbing effect, has a strong ability to disintegrate, the ink particles from the fiber is also very effective peeling, its high concentration solution Concentration of 12-16%, up to 18%, which can save steam, chemicals, power consumption, etc., while producing less small fibers, pulp into a high intensity, high whiteness, the device design rotor diameter φ1905, Speed ​​143rPm, tank diameter φ4600, power 500kw.
2. The roughing machine adopts a low-friction four-blade hydraulic rotor, and the back design has the function of self-cleaning sieve plate, so that the discharged slurry can be evenly dispersed, and the sieve plate is not blocked, and impurities are prevented from being broken. The housing is tilted upwards to keep the rotor from being damaged by heavy impurities and the entire transmission can be moved back. In order to maintain the rotor and screen plate, the equipment is designed to reach a slurry concentration of 4-5%, a rotor diameter of φ1220, a sieve aperture of φ6, and a power of 75kw.
3, high, medium thick cleaner
The slag skimmer uses a free vortex principle and can effectively remove heavy impurities in various types of pulp. The slurry enters the slag remover at a specific angle from the tangential direction, and the centrifugal force is generated when the slurry flow moves toward the slag discharge port along the inner wall in a spiral manner. The impurities in the slurry such as gravel and metal blocks are in the centrifugal force. It is thrown into the inner wall under the action, and discharged downwards from the lower port into the sediment chamber. In the sediment chamber, the slurry is further cleaned, the fibers are recovered, and the waste residue is deposited on the bottom of the slag chamber. The slurry is spiraled upwards. The top of the slag cooler discharges. The cone part is composed of an outer steel shell and an upper and lower two-stage cone of ceramic material. The upper cone is a centrifugal deslagging zone. The upper cross section of the lower cone is a square, and the lower cone is a circle. The coarse slag separated by the cone flows into the lower cone and is gradually decelerated and cleaned. The coarse slag sinks into the sediment chamber and the fiber is returned to the pulp stream, so the fiber loss is low, and the entire slag remover will not be blocked. The high-concentrate slag cleaner has a throughput of 7500-1000 OL/min, a slurry concentration of 3%-6%, a medium-density slag cleaner, a throughput of 5000-7500 L/min, and a slurry concentration of 1%-2%.
4, vertical pressure screen
With the up-flow structure design, the bottom of the slurry enters the slurry, the light impurities and the air in the slurry rise naturally to the top slagging port and rapidly exit the machine, and the heavy impurities settle to the bottom to discharge, greatly reducing the possibility of rotor and screen drum damage. The upflow structure also eliminates the eddy currents that cause the screen body to vibrate, oscillate and stress. The sectional housing is used to adjust the outlet direction of the slurry. The coarse screen adopts a closed non-winding type rotor, and the rotor blades can be replaced after being worn without changing the entire rotor. Fine-screen rotor rotor, preferably rotor structure shape, choose a reasonable choice of speed, produce positive and negative pulse, to achieve the purpose of self-cleaning sieve (slit). Use rippled sieve plates to increase production and improve screening efficiency.
1 Rough sieve: Nominal screening area (hole sieve): 1.2m2
Sieve concentration: 3-4%
Rotor diameter: φ600
Equipped with motor power: 110kW
2 fine screen: Nominal screening area: 3m2
Sieve concentration: 1-2%
Rotor diameter: φ910
With motor power: 160kw
3 fine screen two sieve: nominal screening area 0.8m2
Sieve concentration: 1-2%
Rotor diameter: φ600
Equipped with motor power: 37kW
5. The heat disperser heat disperser adopts the double-roller structure, which uses the reverse rotation of two rollers at different speeds to generate shearing and mixing. It adopts low rotation speed, large rotor clearance, avoids fiber cutting, and has a long working time (about 3 minutes). ), and achieve high shear. Ensure that the slurry is fully processed to obtain the best eye effect. Mechanical structure, the use of motor reducer directly connected to two parallel gears, two parallel shafts are equipped with a plurality of gear rings, the position is staggered to ensure that there is a certain gap, and in the disperser shell is also equipped with a certain arrangement of teeth, The arrangement of the tooth shape arrangement achieves the purpose of kneading and dispersing while the slurry is forwarded to the discharge port. When the slurry concentration is about 30%, the dispersion effect is the best. Thermal disperser roller diameter φ63O, with motor power 750kw.
6, flotation sieve machine
The structure of the device is similar to a closed vertical hydraulic pulper. After the slurry enters the tank, a strong eddy current is generated due to the rotation of the bottom rotor, so that the light weight is concentrated in the low pressure area of ​​the center of the vortex, and the top is designed as a curved surface. Shape, and set the tailings outlet in the center; the rotor rotates to make the slurry more descrease, and the outside of the sieve plate is provided with a groove, so that heavy impurities under the action of centrifugal force are deposited into the groove, and then discharged through heavy impurities, extending Rotor and screen life. Design into pulp concentration: <2%, into the pulp pressure 250Kpa-500Kpa, with power: 55kw.
7. The flotation deinking machine slurry sucks air through a manifold-shaped jet, then mixes it into the first unit into the slurry port through the mixing chamber, enters the first unit for flotation, and then discharges from the discharge port, and then pumps the incident. The flow device is mixed with air, and the flotation device is fed into the second unit to feed the slurry, and so on. According to the actual condition of the slurry, three to five flotation units can be set. Each unit is connected, so that the control is convenient. By calculation, the degree of turbulence in the flotation zone is controlled to achieve the best deinking effect. This device has a good and stable removal effect on ink particles and gel substances in a wide range of sizes. This type of deinking tank is used. Made of stainless steel, fully enclosed, so the environment is relatively good, in addition to the maintenance pump pump work, the power consumption is lower than the vertical flotation tank, flotation tank diameter of φ6650mm. Flotation slurry concentration is about 1%.
8, low concentration cleaner
Using the principle of centrifugal force, fine heavy impurities such as sand and dust in the slurry are removed, and large ink particles and the like are removed. The slag remover has high efficiency, small amount of tailings, reduced pressure, and large throughput. Each scraper inlet and outlet valve is equipped with a valve to reduce system downtime, increase system flexibility and reliability, the system can be based on the actual situation of closed or open two. The material of the dross cleaner is stainless steel. There are two kinds of precision casting and welding according to the use conditions. In the waste paper pulping system, the stainless steel casting is generally used, and the stainless steel pressure welding structure is used for the flow delivery system of the paper machine. The main parameters used are: throughput 600-70OL/min, feed concentration 0.7-0.77%, feed pressure 275-310Kpa, discharge pressure 25-60Kpa.
9, multi-disk vacuum filter
Multi-disc filter is the preferred equipment for white water recovery and pulp concentration. Our latest design of more than 200 disc vacuum filters consists of 12 φ3500 and filter discs. Each disc is divided into 16 discs with different sizes. It is mounted on a hollow shaft with a disc base, and the hollow shaft is also divided into 16 segments. Axial channels that do not communicate with each other. The slurry enters the slurry tank from the mixing tank. Through the filtration, the fibers and other solids in the slurry are adsorbed on the filter screen of the sector plate. As the disk rotates, the filter layer is thickened, and the liquid passes through the filter layer and the filter mesh. Into the fan-shaped plate flow channel, into the hollow shaft, from the dispensing valve end of the hollow shaft out of the turbid liquid and clear liquid in two parts. As the disc continues to rotate, the filter layer turns out of the slurry liquid level. As the atmosphere is switched on, the sector plate vacuum disappears. The pressure water strips the filter layer slurry from the sector plate surface and falls into the slurry material tank.
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