CN103147342B - Method for recycling wax-containing waste paper - Google Patents
Method for recycling wax-containing waste paper Download PDFInfo
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- CN103147342B CN103147342B CN201310081288.5A CN201310081288A CN103147342B CN 103147342 B CN103147342 B CN 103147342B CN 201310081288 A CN201310081288 A CN 201310081288A CN 103147342 B CN103147342 B CN 103147342B
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- wax
- paper pulp
- desanding
- flotation
- waste paper
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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Abstract
The invention relates to a method for recycling wax-containing waste paper and particularly relates to a process for pulping by using wax-containing waste paper. The process comprises the following steps in sequence: repulping, desanding by using a high-concentration desanding device, screening coarsely, desanding by using a medium-concentration desanding device, screening finely, floating, desanding by using a low-concentration desanding device, concentrating and dispersing heat. Repluping is performed by disintegrating indirectly to ensure that the wax in waste paper can not be disintegrated seriously, by controlling the temperature of repulping to ensure that the wax can exist in the coarse pulp in an unbound state, and by adding a coagulating agent to ensure that the wax has larger aggregate particles than the untreated wax and is smooth in surfaces and low in density, more than 90% of wax can be removed easily by desanding using the high-concentration desanding device, screening coarsely, desanding using the medium-concentration desanding device and screening finely.
Description
Technical field
The present invention relates to pulp technology for making paper, specifically relate to a kind of pulping process utilizing the recycling of content of wax waste paper.
Background technology
Some old corrugated case scribbles one deck paraffin or is soaked with paraffin, generally by go-on-go, the old corrugated container scribbling paraffin is sorted out, so not only need artificial, also can waste some raw material, and but those old corrugated container being soaked with paraffin are difficult to identify usually, therefore, the old corrugated container always having the content of wax of part enters slurrying flow process, if paraffin content is lower than 1%, the raw material that this content of wax waste paper is also qualified at last.If but paraffin content is too high, such waste paper is in recycling process, and wax just becomes the largest source that waste paper recycles paper plant's wax contamination.Because the existence of the wax in fiber will reduce the coefficient of friction of cardboard, reduce wettable and interfibrous adhesion, and the glueability of printing performance and board product can be damaged.The wax point of paperboard surface not only affects outward appearance, also hinders the adhesion of coating simultaneously.
Wax has native paraffin and synthetic wax two class.Native paraffin is from oil, mineral, animal, plant and insect etc.Synthetic wax comprises Tissuemat E, solid polyethylene ethylene glycol etc.Wax in solid shape, is at room temperature low-viscosity (mobile) liquid during raised temperature.Wax is hydrophobic and has characteristic that is hard, crisp, pliable and tough, soft or that be clamminess.The density of major part wax is about 0.9 ~ 1.0g/cm
3.Paraffin and wax based hot-melt coating or adhesive are the wax sources being widely used in paper and paperboard packaging product.Paraffin contains the hydrocarbon that fusing point is 53 ~ 100 DEG C, and wax based hot-melt coating or adhesive are usually containing vinyl acetate ethylene copolymer, the resin that is clamminess, Tissuemat E and elastic material, and they are hard compared with paraffin usually and have higher fusing point.
Its softening point/fusing point is mainly decided by the characteristic performance of paper manufacturing systems wax, viscosity and the characteristic be clamminess, if wax start be exactly melting with dispersion, then screen, purification and other processes in temperature be reduced to the fusing point of wax time, it will be easy to be deposited on fiber surface or machine surface; On the other hand, when the wax do not disperseed is melted on its surrounding annulus, after page is by drying section, then can there is dark wax spot on page.The wax stayed in paper pulp also can reduce the coefficient of friction of page.Wax also can coat every bar fiber, and result is that interfibrous combination decreases, and the intensity of page have dropped.Be dispersed in wax in page on a small quantity also reduce the wettable of page by prominent and increase the sizing of page, therefore, wax is prejudicial to the printing performance of paper and glueability.
Wax during general process content of wax waste paper reclaims all processes in pulping process, and wax in water system most likely with three kinds of forms, be free state, dispersity and adsorbed state respectively, be generally lower than 48.9 ° during low temperature, paraffin mainly exists with free state, fiber surface can not be adsorbed on, therefore, but the paraffin of general free state only accounts for 10% of entire quantity, therefore, even if adopt the mode of screening to purify, little a part of paraffin also can only be removed; The paraffin of suspended state is generally formed when 50-71 °, this time tiny paraffin particles quantity showed increased, the paraffin of this form is just more difficult to be removed; The paraffin of adsorbed state then refers to that paraffin is adsorbed on fiber, but at high temperature, the paraffin of adsorbed state also can dissociate out and become suspended state, and therefore, the paraffin of both form can be changed mutually, and it is also suitable that it removes difficulty.
Therefore, be exactly the removal of the paraffin of suspended state and the paraffin of adsorbed state at the important bottleneck of content of wax waste paper recycling, the method that also neither one is fairly perfect now solves this kind of problem, thus improves the recycling efficiency of content of wax waste paper.
Summary of the invention
Technical problem to be solved by this invention is that in content of wax waste paper, suspended state and adsorbed state paraffin are difficult to the problem removed.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is, a kind of reuse method of content of wax waste paper, comprise and utilize content of wax waste paper pulp-making process, pulping process in turn includes the following steps again: pulping, high dense desanding, scalping, in dense desanding, fine screen, flotation, low dense desanding, concentrated, heat partition;
(1) pulping: content of wax waste paper and water are placed in pulper and carry out batch beating, add flocculating agent, control PH ≈ 7, controlling pulping concentration is 5 ~ 10%, and control temperature is 48.9 ~ 49.0 DEG C, and control pulping time is 25 ~ 30min, insulation 0 ~ 30min, obtain the rough paper pulp after size degradation, the wax in rough paper pulp is condensed into wax condensation product by this flocculating agent, and the quality proportioning controlling flocculating agent makes the granular size scope of wax condensation product between 530 ~ 3210um;
(2) high dense desanding: the rough paper pulp after scalping is entered high concentration desanding device and carries out preliminary purification, entering to starch concentration is 3 ~ 5%, and entering to starch pressure is 200 ~ 250kPa;
(3) scalping: the hole sizer that the rough paper pulp aperture after preliminary purification is 9 ~ 15mm is screened, remove larger impurity, screening operation pressure reduction is 32 ~ 38kPa, entering to starch pressure is 160 ~ 210kPa, entering to starch mass percent concentration is 2 ~ 3%, ash-retention efficiency is 3 ~ 5%, obtains the paper pulp after scalping;
(4) dense desanding in: dense desander during the paper pulp after scalping is squeezed into, the impurity of removing mean quality, controlling into slurry pressure is 380 ~ 400kPa, and operting differential pressure is 140 ~ 230 kPa;
(5) fine screen: to through in rough paper pulp after dense desanding with 0.05 ~ 0.15mm slotted screen except dewax condensation product, generate paper pulp;
(6) flotation: the paper pulp after fine screen enters flotation cell, adds flotation surfactant, and this flotation surfactant addition is the rough paper pulp of 1kg/t, control slurry dense 5%, control flotation temperature 48.9 ~ 49 DEG C, control PH ≈ 8, the control water hardness is 80mg/L(CaCO
3meter), control throughput is 10 ~ 20m3/h, and controlled pressure is 1.5 ~ 3.0MPa, flotation time 5 ~ 30min;
(7) low dense desanding: the paper pulp after flotation enters the less heavy seeds of low dense desander removing, and controlling into slurry pressure is 400 ~ 450kPa, and operting differential pressure is 120 ~ 130 kPa;
(8) concentrated: the paper pulp slurry after low dense desanding enters thickener and concentrates, and the temperature of entering to starch of thickener is 55 ~ 58 DEG C, and liquid level is 80 ~ 90%;
(9) heat partition: the paper pulp after flotation enters in heat dispersion machine and carries out heat partition, adds the mixed dispersant of the rough paper pulp of 1.8kg/t, controls slurry dense 6%, control temperature 56 ~ 59 DEG C.By heat partition, the wax point being greater than 0.5mm2 in slurry can be made to reduce 52% ~ 53%, and the wax point being greater than 3 mm2 reduces 58% ~ 69%, and the angle of friction of cardboard also improves 19% ~ 47%.
Further, described flocculating agent with the radioactive ray crosslinked of polyglutamic acid or polyglutamate for main component.
Further, the radioactive ray crosslinked of described polyglutamic acid or polyglutamate adds in liquid to be treated and makes its concentration be 0.1mg/L ~ 10mg/L.
Further, described surfactant is anionic surfactant, cationic surface active agent or non-ionic surface active agent, anionic surfactant is stearic acid, a kind of in neopelex, lauryl sodium sulfate or their any combination;
Cationic surface active agent is a kind of in hexadecyldimethyl benzyl ammonium ammonium chloride, DDAO, cation guar gum, CATION panthenol, cationic silicone oils or their any combination;
Non-ionic surface active agent is a kind of in alkylolamides, fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene or their any combination.
The present invention is by adopting technique scheme, compared with prior art, tool has the following advantages: first, the present invention carries out pulping by indirect size degradation, the wax in waste paper is made not want the too broken of size degradation, the temperature simultaneously controlling pulping makes wax be in rough paper pulp with free state, and add flocculating agent, make wax aggregate particle than greatly untreated, and its smooth surface, density is less than normal again, so just easily via the dense desanding of height, scalping, in the step of dense desanding and fine screen remove more than 90% wax.Then by adding surfactant in flotation step, the effect of further raising paraffin removal, wax clearance is at this time 94-97%, finally, adopt heat partition, and add mixed dispersant in paper pulp, and this mixed dispersant can generate microbubble to be adsorbed on paraffin, make the actual specific gravity of paraffin be significantly smaller than fiber proportion, these little particles just can be removed from slurry by light dregs-removing device, make the wax clearance in paper pulp reach more than 99%.
Detailed description of the invention
As a specific embodiment, the reuse method of a kind of content of wax waste paper of the present invention, comprise and utilize content of wax waste paper pulp-making process, pulping process in turn includes the following steps again: pulping, high dense desanding, scalping, in dense desanding, fine screen, flotation, low dense desanding, concentrated, heat partition;
(1) pulping: content of wax waste paper and water are placed in pulper, add flocculating agent, control PH ≈ 7, controlling pulping concentration is 5 ~ 10%, and control temperature is 48.9 ~ 49.0 DEG C, and control pulping time is 25 ~ 30min, insulation 0 ~ 30min, obtain the rough paper pulp after size degradation, the wax in rough paper pulp is condensed into wax condensation product by this flocculating agent, and the quality proportioning controlling flocculating agent makes the granular size scope of wax condensation product between 530 ~ 3210um;
Described flocculating agent with the radioactive ray crosslinked of polyglutamic acid or polyglutamate for main component.The radioactive ray crosslinked of described polyglutamic acid or polyglutamate adds in liquid to be treated makes its concentration be 0.1mg/L ~ 10mg/L.
In pulping operation, pulping is carried out by indirect size degradation, the wax in waste paper is made not want the too broken of size degradation, the temperature simultaneously controlling pulping makes wax be in rough paper pulp with free state, the size degradation later stage adds flocculating agent again, make the granular size of wax condensation product comparatively large, smooth surface, density is lower than 0.98g/cm
3.Found by concrete practice, pH value and the granular size of flocculating agent addition on cohesion wax aggregated particle have impact, in the process that flocculating agent is constant, time pH value is 7, wax aggregated particle is maximum, and when PH is 7, flocculating agent addition is more, the size of wax flocculated particle is larger, therefore, in this operation, control PH ≈ 7.
(2) high dense desanding: the rough paper pulp after scalping is entered high concentration desanding device and carries out preliminary purification, entering to starch concentration is 3 ~ 5%, and entering to starch pressure is 200 ~ 250kPa;
(3) scalping: the hole sizer that the rough paper pulp aperture after preliminary purification is 9 ~ 15mm is screened, remove larger impurity, screening operation pressure reduction is 32 ~ 38kPa, entering to starch pressure is 160 ~ 210kPa, entering to starch mass percent concentration is 2 ~ 3%, ash-retention efficiency is 3 ~ 5%, obtains the paper pulp after scalping;
(4) dense desanding in: dense desander during the paper pulp after scalping is squeezed into, the impurity of removing mean quality, controlling into slurry pressure is 380 ~ 400kPa, and operting differential pressure is 140 ~ 230 kPa;
(5) fine screen: to through in rough paper pulp after dense desanding with 0.05 ~ 0.15mm slotted screen except dewax condensation product, generate paper pulp;
The wax condensation product particle generated in step (1) pulping operation by high dense desanding, scalping, in the step of dense desanding and fine screen remove, the wax of more than 90% in entire slurry is removed.
(6) flotation: the paper pulp after fine screen enters flotation cell, adds flotation surfactant, and this flotation surfactant addition is the rough paper pulp of 1kg/t, control slurry dense 5%, control flotation temperature 48.9 ~ 49 DEG C, control PH ≈ 8, the control water hardness is 80mg/L(CaCO
3meter), control throughput is 10 ~ 20m3/h, and controlled pressure is 1.5 ~ 3.0MPa, flotation time 5 ~ 30min;
Described surfactant is anionic surfactant, cationic surface active agent or non-ionic surface active agent, anionic surfactant is stearic acid, a kind of in neopelex, lauryl sodium sulfate or their any combination; Cationic surface active agent is a kind of in hexadecyldimethyl benzyl ammonium ammonium chloride, DDAO, cation guar gum, CATION panthenol, cationic silicone oils or their any combination; Non-ionic surface active agent is a kind of in alkylolamides, fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene or their any combination.
Then by adding surfactant in flotation step, improve the effect of paraffin removal further, wax clearance is at this time 94-97%.
(7) low dense desanding: the paper pulp after flotation enters the less heavy seeds of low dense desander removing, and controlling into slurry pressure is 400 ~ 450kPa, and operting differential pressure is 120 ~ 130 kPa;
(8) concentrated: the paper pulp slurry after low dense desanding enters thickener and concentrates, and the temperature of entering to starch of thickener is 55 ~ 58 DEG C, and liquid level is 80 ~ 90%;
(9) heat partition: the paper pulp after flotation enters in heat dispersion machine and carries out heat partition, adds the mixed dispersant of the rough paper pulp of 1.8kg/t, controls slurry dense 6%, control temperature 56 ~ 59 DEG C.
Finally, adopt heat partition, and in paper pulp, add mixed dispersant, and this mixed dispersant can generate microbubble to be adsorbed on paraffin, the actual specific gravity of paraffin is made to be significantly smaller than fiber proportion, these little particles just can be removed from slurry by light dregs-removing device, make the wax clearance in paper pulp reach more than 99%.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; can make a variety of changes the present invention in the form and details, be protection scope of the present invention.
Claims (6)
1. the reuse method of a content of wax waste paper, comprise and utilize content of wax waste paper pulp-making process, it is characterized in that: pulping process in turn includes the following steps again: pulping, high dense desanding, scalping, in dense desanding, fine screen, flotation, low dense desanding, concentrated, heat partition;
(1) pulping: content of wax waste paper and water are placed in pulper and carry out batch beating, add flocculating agent, control pH ≈ 7, controlling pulping concentration is 5 ~ 10%, and control temperature is 48.9 ~ 49.0 DEG C, and control pulping time is 25 ~ 30min, insulation 0 ~ 30min, obtain the rough paper pulp after size degradation, the wax in rough paper pulp is condensed into wax condensation product by this flocculating agent, and the quality proportioning controlling flocculating agent makes the granular size scope of wax condensation product between 530 ~ 3210 μm; Described flocculating agent with the radioactive ray crosslinked of polyglutamic acid or polyglutamate for main component,
(2) high dense desanding: the rough paper pulp after scalping is entered high concentration desanding device and carries out preliminary purification, entering to starch concentration is 3 ~ 5%, and entering to starch pressure is 200 ~ 250KPa;
(3) scalping: the hole sizer that the rough paper pulp aperture after preliminary purification is 9 ~ 15mm is screened, remove larger impurity, screening operation pressure reduction is 32 ~ 38KPa, entering to starch pressure is 160 ~ 210KPa, entering to starch mass percent concentration is 2 ~ 3%, ash-retention efficiency is 3 ~ 5%, obtains the paper pulp after scalping;
(4) dense desanding in: dense desander during the paper pulp after scalping is squeezed into, the impurity of removing mean quality, controlling into slurry pressure is 380 ~ 400KPa, and operting differential pressure is 140 ~ 230 KPa;
(5) fine screen: to through in rough paper pulp after dense desanding with 0.05 ~ 0.15mm slotted screen except dewax condensation product, generate paper pulp;
(6) flotation: the paper pulp after fine screen enters flotation cell, adds flotation surfactant, and this flotation surfactant addition is the rough paper pulp of 1kg/t, controls slurry dense 5%, and control flotation temperature 48.9 ~ 49 DEG C, control pH ≈ 8, with CaCO
3meter, the control water hardness is 80mg/L, and control throughput is 10 ~ 20m3/h, and controlled pressure is 1.5 ~ 3.0MPa, flotation time 5 ~ 30min;
(7) low dense desanding: the paper pulp after flotation enters the less heavy seeds of low dense desander removing, and controlling into slurry pressure is 400 ~ 450KPa, and operting differential pressure is 120 ~ 130 KPa;
(8) concentrated: the paper pulp slurry after low dense desanding enters thickener and concentrates, and the temperature of entering to starch of thickener is 55 ~ 58 DEG C, and liquid level is 80 ~ 90%;
(9) heat partition: the paper pulp after flotation enters in heat dispersion machine and carries out heat partition, adds the mixed dispersant of the rough paper pulp of 1.8kg/t, controls slurry dense 6%, control temperature 56 ~ 59 DEG C.
2. the reuse method of a kind of content of wax waste paper according to claim 1, is characterized in that: the radioactive ray crosslinked of described polyglutamic acid or polyglutamate adds in liquid to be treated makes its concentration be 0.1mg/L ~ 10mg/L.
3. the reuse method of a kind of content of wax waste paper according to claim 1, is characterized in that: described surfactant is anionic surfactant, cationic surface active agent or non-ionic surface active agent.
4. the reuse method of a kind of content of wax waste paper according to claim 3, is characterized in that: described anionic surfactant is stearic acid, a kind of in neopelex, lauryl sodium sulfate or their any combination.
5. the reuse method of a kind of content of wax waste paper according to claim 3, is characterized in that: cationic surface active agent is a kind of in hexadecyldimethyl benzyl ammonium ammonium chloride, DDAO, cation guar gum, CATION panthenol, cationic silicone oils or their any combination.
6. the reuse method of a kind of content of wax waste paper according to claim 3, is characterized in that: non-ionic surface active agent is a kind of in alkylolamides, fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene or their any combination.
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| CN201310081288.5A CN103147342B (en) | 2013-03-14 | 2013-03-14 | Method for recycling wax-containing waste paper |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103981292B (en) * | 2014-05-04 | 2015-07-29 | 陕西科技大学 | A kind of method that content of wax waste paper resourcesization utilizes |
| CN106948199A (en) * | 2017-03-13 | 2017-07-14 | 吉安集团有限公司 | The system that a kind of use floatation handles waste paper pulp sicker |
| CN110552221A (en) * | 2019-08-13 | 2019-12-10 | 山鹰国际控股股份公司 | wax and paper separation process for waste wax cartons and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1292052A (en) * | 1998-02-24 | 2001-04-18 | 韦尔豪泽公司 | Method for removing wax from pulp furnish |
| CN101067289A (en) * | 2007-06-27 | 2007-11-07 | 张书荣 | Method for papermaking utilizing waste paper containing wax |
| CN102108649B (en) * | 2010-12-01 | 2012-09-05 | 山东晨鸣纸业集团股份有限公司 | Waste paper deinking process method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1292052A (en) * | 1998-02-24 | 2001-04-18 | 韦尔豪泽公司 | Method for removing wax from pulp furnish |
| CN101067289A (en) * | 2007-06-27 | 2007-11-07 | 张书荣 | Method for papermaking utilizing waste paper containing wax |
| CN102108649B (en) * | 2010-12-01 | 2012-09-05 | 山东晨鸣纸业集团股份有限公司 | Waste paper deinking process method |
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