CN112342824A - Papermaking screening deslagging process - Google Patents
Papermaking screening deslagging process Download PDFInfo
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- CN112342824A CN112342824A CN202010282529.2A CN202010282529A CN112342824A CN 112342824 A CN112342824 A CN 112342824A CN 202010282529 A CN202010282529 A CN 202010282529A CN 112342824 A CN112342824 A CN 112342824A
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- 238000012216 screening Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000008569 process Effects 0.000 title claims abstract description 29
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 131
- 239000002893 slag Substances 0.000 claims abstract description 116
- 239000012535 impurity Substances 0.000 claims abstract description 112
- 230000009471 action Effects 0.000 claims abstract description 98
- 239000010893 paper waste Substances 0.000 claims abstract description 92
- 239000010426 asphalt Substances 0.000 claims abstract description 64
- 239000006185 dispersion Substances 0.000 claims abstract description 50
- 230000005484 gravity Effects 0.000 claims abstract description 37
- 239000004831 Hot glue Substances 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 14
- 239000004575 stone Substances 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims description 147
- 239000000835 fiber Substances 0.000 claims description 62
- 238000007599 discharging Methods 0.000 claims description 52
- 238000010438 heat treatment Methods 0.000 claims description 36
- 238000010025 steaming Methods 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 239000012943 hotmelt Substances 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 24
- 238000005507 spraying Methods 0.000 claims description 24
- 239000000126 substance Substances 0.000 claims description 24
- 238000010790 dilution Methods 0.000 claims description 21
- 239000012895 dilution Substances 0.000 claims description 21
- 238000007865 diluting Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 238000010494 dissociation reaction Methods 0.000 claims description 12
- 230000005593 dissociations Effects 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000000746 purification Methods 0.000 claims description 12
- 229920006395 saturated elastomer Polymers 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 230000005226 mechanical processes and functions Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The invention relates to the technical field of papermaking, in particular to a papermaking screening deslagging process, which comprises the following steps of deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to carry out high-speed rotary motion in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the device under the action of centrifugal force, and enabling heavy impurities to be under the action of gravity when pulp flows downwards to carry out spiral motion; the invention can remove heavy metal, asphalt and hot melt adhesive in the paper pulp through the process flows of slag removal of the waste paper pulp, screening of the waste paper pulp, dispersion treatment of the asphalt and treatment of the hot melt adhesive, achieves the advantage of removing impurities generated in the paper making process, and solves the problems of serious abrasion of the impurities to equipment and influence of the impurities on the paper quality in the paper making process.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a papermaking screening deslagging process.
Background
The paper making process includes two modes, one is mechanical process and one is manual process, and the mechanical process is continuous in paper making machine, and includes diluting paper pulp with water to certain concentration, dewatering in the net part of the paper making machine to form wet paper sheet, squeezing to dewater and stoving to form paper.
After the waste paper is pulped by a hydrapulper and separated into fibers by a fluffer, the waste paper pulp contains more impurities, wherein heavy impurities such as small stones, sand grains, glass scraps, scrap iron, steel needles, clay and the like exist, the heavy impurities seriously abrade papermaking and pulping equipment, and light impurities such as wood chips, plastic membranes, resin, rubber blocks, fiber bundles and the like seriously affect the quality of finished paper, so that the papermaking screening deslagging process is invented to remove the impurities generated in the papermaking process.
Disclosure of Invention
The invention aims to provide a papermaking screening deslagging process, which has the advantage of removing impurities generated in the papermaking process and solves the problems of serious abrasion of the impurities to equipment and influence of the impurities on the quality of paper in the papermaking process.
In order to achieve the purpose, the invention provides the following technical scheme: a papermaking screening deslagging process comprises the following steps:
A. deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Preferably, the slag remover is a high-concentration slag remover and has a model of ZSC 21.
Preferably, the pulp inlet conditions of the high-concentration slag separator are as follows: the slurry pump with a large head (more than 20 m) is selected.
Preferably, the high-concentration slag separator has the following dilution water pressure conditions: the dilution water pressure is required to be more than 0.2MPa, and a check valve is arranged in front of the dilution water pipe.
Preferably, the high-concentration slag remover finds out the slag removal rule according to the slag content of the raw materials, makes an operation rule according to the slag removal time, and removes slag in time.
Preferably, the pulp inlet concentration range of the high-concentration slag separator is 3% -4.5%, and the pulp inlet concentration is the best when the pulp inlet concentration is 3%.
Preferably, the inside of pressure screen machine contains coarse screening device and fine screening device, coarse screening device is the pass pressure screen, fine screening device is the slot shape screen.
Preferably, the coarse screening device can work in a concentration range of 3.5% to 5.0%, or in a concentration range of less than 2.0%, and has a mesh diameter of 1.3mm to 2.0 mm.
Preferably, the fine screening apparatus can operate in a concentration range of more than 1.0%, and the fine screening apparatus has a screen slot width of 0.35 mm.
Compared with the prior art, the invention has the following beneficial effects:
the invention can remove heavy metal, asphalt and hot melt adhesive in the paper pulp through the process flows of slag removal of the waste paper pulp, screening of the waste paper pulp, dispersion treatment of the asphalt and treatment of the hot melt adhesive, achieves the advantage of removing impurities generated in the paper making process, and solves the problems of serious abrasion of the impurities to equipment and influence of the impurities on the paper quality in the paper making process.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a screening and deslagging process for papermaking comprises the following steps:
A. deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
The first embodiment is as follows:
A. deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Example two:
in the first embodiment, the following steps are added:
the slag remover is a high-concentration slag remover and has a model of ZSC 21.
A. Deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Example three:
in the second embodiment, the following steps are added:
the pulp inlet conditions of the high-concentration slag separator are as follows: the slurry pump with a large head (more than 20 m) is selected.
A. Deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Example four:
in the third embodiment, the following steps are added:
the dilution water pressure condition of the high-concentration slag remover is as follows: the dilution water pressure is required to be more than 0.2MPa, and a check valve is arranged in front of the dilution water pipe.
A. Deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Example five:
in the fourth example, the following steps were added:
the high-concentration slag remover finds out the slag discharging rule according to the slag content of the raw materials, makes an operation rule according to the slag discharging time, and discharges slag in time.
A. Deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Example six:
in the fifth example, the following steps were added:
the pulp inlet concentration range of the high-concentration slag separator is 3% -4.5%, and the pulp inlet concentration is the best when the pulp inlet concentration is 3%.
A. Deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Example seven:
in example six, the following steps were added:
the inside of the pressure screen machine comprises a coarse screening device and a fine screening device, wherein the coarse screening device is a hole-type pressure screen, and the fine screening device is a slot-type screen.
A. Deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Example eight:
in example seven, the following steps were added:
the coarse screening device can work in the concentration range of 3.5% -5.0%, or in the concentration range of less than 2.0%, and the diameter of the screen hole is 1.3mm-2.0 mm.
A. Deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Example nine:
in example eight, the following steps were added:
the fine screening apparatus can operate in a concentration range of more than 1.0% and the fine screening apparatus has a screen slot width of 0.35 mm.
A. Deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A papermaking screening deslagging process is characterized in that: the method comprises the following steps:
A. deslagging waste paper pulp: the method comprises the following steps of (1) carrying out deslagging operation on waste paper pulp by adopting a deslagging device, feeding unpurified pulp into the deslagging device from the top of the deslagging device in a tangential direction by using a pump, enabling the paper pulp to rotate at a high speed in the deslagging device by using an impeller which rotates at a high speed near a pulp inlet, throwing impurities with large relative density, such as stones, sand, metal objects and the like, to the wall of the deslagging device under the action of centrifugal force, slowly settling heavy impurities into a slag collecting chamber under the action of gravity when pulp flows downwards to perform spiral motion, spraying clear water into the slag collecting chamber to separate the heavy impurities from the paper pulp, discharging coarse slag by using a slag discharging valve, and discharging impurities heavier than fibers with the diameter of more than 3mm when the concentration of the paper pulp is 3% -5%;
B. screening waste paper pulp: the slag remover can remove impurities with larger specific gravity or lighter specific gravity, but impurities with relative density close to that of fibers can be removed only by screening, slurry after slag removal is conveyed into the pressure screening machine by adopting a slurry pump, the slurry is fed from the bottom of the pressure screening machine in a feeding mode, the light impurities and air in the slurry naturally rise to a top slag discharge port to be discharged, and the heavy impurities can settle to the bottom to be discharged as soon as entering the machine body;
C. and (3) asphalt dispersion treatment: firstly, steaming and heating purified and screened waste paper pulp containing asphalt to make the asphalt be in a molten state, then dispersing the asphalt in the paper pulp by the action of a screw machine, concentrating the slurry to the concentration of 12-15% by an inclined screw concentrator, then concentrating the slurry to the concentration of 30-35% by a screw press, sending the slurry into a pressure zone from an ordinary pressure zone by a screw feeder through a feeding chamber, controlling the slurry to stay in a steaming pipe for 3-5 minutes, keeping the temperature in the steaming pipe at about 150 ℃, dispersing the molten asphalt or other hot melt in the slurry under the mechanical action of the screw, discharging the slurry through a discharger, spraying the slurry to a cyclone separator, simultaneously sending dilution water, diluting and cooling the slurry;
D. and (3) processing the hot melt adhesive: the method combines mechanical action and thermal dispersion action, waste paper pulp after dissociation and preliminary purification is sent into a thermal dispersion system, the waste paper pulp is firstly concentrated to 25-35% dryness, the pulp is sent into a heating screw by a screw conveyer, saturated steam is used for heating to 90 ℃ (low temperature) or 110 ℃ -120 ℃ (high temperature) to evaporate volatile substances in the pulp, a feeding screw is used for sending the pulp into a thermal dispersion machine, and hot melt substances stuck on the waste paper are separated from fibers under the mechanical action and dispersed into tiny particles by utilizing the strong friction action between high-concentration fibers, and the tiny particles are uniformly dispersed among the fibers without causing damage to paper production.
2. The papermaking screening deslagging process of claim 1, wherein: the slag separator is a high-concentration slag separator and has a model of ZSC 21.
3. The papermaking screening deslagging process of claim 1, wherein: the pulp inlet conditions of the high-concentration slag separator are as follows: the slurry pump with a large head (more than 20 m) is selected.
4. The papermaking screening deslagging process of claim 1, wherein: the high-concentration slag remover is characterized in that the dilution water pressure conditions are as follows: the dilution water pressure is required to be more than 0.2MPa, and a check valve is arranged in front of the dilution water pipe.
5. The papermaking screening deslagging process of claim 1, wherein: the high-concentration slag remover finds out the slag discharging rule according to the slag content of the raw materials, makes an operation rule according to the slag discharging time, and discharges slag in time.
6. The papermaking screening deslagging process of claim 1, wherein: the pulp inlet concentration range of the high-concentration slag separator is 3% -4.5%, and the pulp inlet concentration is the best when the pulp inlet concentration is 3%.
7. The papermaking screening deslagging process of claim 1, wherein: the inside of pressure screen machine contains coarse screening device and fine screening device, coarse screening device is the pass pressure screen, the fine screening device is the slot shape screen.
8. The papermaking screening deslagging process of claim 7, wherein: the coarse screening device can work in the concentration range of 3.5-5.0% or in the concentration range of less than 2.0%, and the diameter of the screen hole is 1.3-2.0 mm.
9. The papermaking screening deslagging process of claim 7, wherein: the fine screening apparatus can operate in a concentration range of more than 1.0%, and the fine screening apparatus has a screen slot width of 0.35 mm.
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