CN102605662B - Waste paper deinking method - Google Patents
Waste paper deinking method Download PDFInfo
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- CN102605662B CN102605662B CN201210112132.4A CN201210112132A CN102605662B CN 102605662 B CN102605662 B CN 102605662B CN 201210112132 A CN201210112132 A CN 201210112132A CN 102605662 B CN102605662 B CN 102605662B
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- waste paper
- deinking
- pulping
- flotation
- pulp
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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
Abstract
The invention belongs to the technical field of paper making and relates to a water paper deinking method, which aims to solve the problem of poor deinking effect in a neutral deinking process. The invention provides the water paper deinking method which comprises a pulping step of pulping by using a pulping machine and a flotation step of floating waste paper pulp by using a floatation groove. The water paper deinking method is characterized by further comprising a waste paper fiber rubbing step between the pulping step and the floatation step. The pulping step comprises a step of adding a deinking agent for the first time, and the floatation step comprises a step of adding the deinking agent for the second time. With the adoption of the above technical scheme disclosed by the invention, the technical problem can be effectively solved.
Description
Technical field
The invention belongs to pulp technology for making paper, relate to a kind of deinking process for waste paper.
Background technology
China's Forest Resources lacks, wood pulp mainly depends on import, waste paper reaches more than 70% in China's paper making raw material, when waste paper is recycled, the contaminated wastewater and the waste water handling problem that in waste paper pulp-making process, produce are more and more outstanding, Deinking Pulp waste water particularly, this is relevant with Deinking Pulp character and production technology.
Conventionally, generally add NaOH (NaOH) in deinking office waste paper process, require pH value to reach more than 10, under high alkalinity environment, ink is easily separated with fiber, but quite unfavorable to equipment, operating environment, stock quality, subsequent wastewater treatment etc.
At present, new development the technique of some deinkings under neutrallty condition, but deinking efficiency is with respect to being used the deinking process of NaOH to have decline to a certain degree, therefore, the demand that improves deinking efficiency under neutral condition becomes urgent.
Summary of the invention
The technical problem to be solved in the present invention is that the deinking efficiency of neutral deinking technique is not high, and provides a kind of deinking process for waste paper for this problem.
The scheme that the present invention solves the problems of the technologies described above is:
A kind of deinking process for waste paper, comprise with pulper and carry out the pulping step of pulping and with flotation cell, waste paper pulp is carried out the flotation step of flotation, it is characterized in that the method also comprises the rubbing waste paper fibre step between pulping step and flotation step, described pulping step comprises the step of adding for the first time deinking agent, and described flotation step comprises the step of adding for the second time deinking agent.
Before the present invention, the technical process that deinking need to experience comprises pulping and floating washing, conventionally when waste paper is carried out to pulping, add deinking agent, after pulping completes, float and wash again, and in pulping process, waste paper is not cracked completely, in fact, major part exists with the tiny scraps of paper, from microcosmic, waste paper is by fibrous, in the pulping stage, add deinking agent, can only process the lip-deep ink of waste paper, and can not dispose completely the ink of infiltration between fiber and fiber, thereby cause ink residue, make the paper quality made not white, have to further bleach.
The present invention's imagination is roughly divided into two steps by deinking, and first step is pulping step, and adds deinking agent to carry out deinking in this step; Second step is flotation step, and in this step again add deinking agent deinking, in flotation step, handled waste paper can be single fiber by rubbing waste paper fibre step transitions, now add again deinking agent completely residual ink to be removed, can greatly improve the deinking efficiency of waste paper.
Although have correlation technique file to think to make deinking agent contain Multiple components and significantly strengthen than the deinking efficiency that contains single component, but the present invention finds, there is not inevitable contacting with the number of deinking agent composition in overall effects on slurry making, in fact, contain Multiple components (for convenience of description, composition in deinking agent is distinguished according to activating agent and assistant) deinking agent except increasing cost, for example, if further add some assistants that promote deinking efficiencies (surfactant in the pulping stage, auxiliary enzymes etc.), although can reach, improve deinking efficiency expection, but can not solve the problem of ink residue completely, in addition, ink forms glyceride ester bond between the glyceride in ink and fiber conventionally firmly adheres on paper ink, more normally used assistants (as auxiliary enzymes), to make fiber separated with ink by decomposition of cellulose, so just destroyed part fiber, reduced the yield of fibre strength and waste paper pulp-making.
Aborning, any reagent that is conducive to destroy glyceride ester bond in fact all can be used to waste paper to carry out deinking, for example the present invention is made as deinking agent by lipase, nonetheless, also can make waste paper after whole deinking process for waste paper, reach good deinking efficiency, general, the whiteness of the Deinking Pulp obtaining after flotation step is more than 64 ISO%, and dirt count (residual ink) is below 150ppm.
The specific embodiment
This specific embodiment is the supplementary detailed description to summary of the invention.
A kind of deinking process for waste paper of the present invention comprises pulping step, flotation step and the rubbing waste paper fibre step between pulping step and flotation step, described pulping step comprises the step of the first interpolation deinking agent, flotation step comprises the step of the second interpolation deinking agent, the present invention generally selects lipase as deinking agent, described lipase at least can destroy between glyceride in ink and fiber and form glyceride ester bond, make ink and fiber separation, thereby deinking efficiency is represented.
In some embodiments of the invention, described step of adding for the first time deinking agent comprises to adding and account for the lipase that waste paper percentage by weight is 0.02-0.08% in pulper.
In some embodiments of the invention, the mass percent concentration of the waste paper pulp in described pulper is 18-20%.The pH value of described waste paper pulp is 7.0-8.0, does not need to add extra acid or alkali maintains in above-mentioned scope pH value to waste paper pulp.
In some embodiments of the invention, described rubbing waste paper fibre step comprises waste paper pulp is passed in heat dispersion machine, utilizes heat dispersion machine abrasive disc to make rubbing voluntarily between fiber, and described hot dispersion temperature is 90 ℃-100 ℃.
In some embodiments of the invention, the waste paper pulp mass percent concentration in heat dispersion machine is 25%-28%.
In some embodiments of the invention, described step of adding for the second time deinking agent comprises to adding and account for the lipase that waste paper percentage by weight is 0.02-0.08% in flotation cell.
In some embodiments of the invention, described a kind of deinking process for waste paper also comprises the waste paper pulp purifying step between pulping step and rubbing waste paper fibre step.
In some embodiments of the invention, described slurry purification step comprises passes through pressurized screen by slurry, the wide 0.12mm that is at least less than of described pressurized screen screen cylinder seam, and pressure is 0.25-0.30Mpa.
In view of the drawback that deinking is carried out under the environment of alkali, the present invention adheres to not adding the principle of any alkali in deinking process, and is adhering on the basis of this principle, improves deinking efficiency.In improving all previous experiment of deinking efficiency, the present invention's discovery adds a large amount of lipase conventionally in the process of waste paper being carried out to pulping, and the deinking efficiency obtaining is unsatisfactory.On the one hand, when pulper carries out pulping to waste paper, waste paper can not be fragmented into single waste paper fibre completely, in fact, waste paper through pulper pulping generally exists with the form of the tiny scraps of paper, although the lipase adding can make the ink on tiny paper depart from, and for the ink infiltrating between waste paper fibre, often cannot realize effective deinking; On the other hand, in pulping step, technical staff is probably for different waste paper kinds, carry out preliminary waste residue (be also mixed in the foreign material in waste paper or be not suitable for making other materials of paper pulp) separation, when waste residue is separated, therefore exist the risk that lipase is also separated, no matter from cost or from deinking efficiency, the lipase adding for the first time in the step of deinking agent is all difficult for too much interpolation.
Make waste paper split into the ink that can be easy to make to infiltrate between waste paper fibre with single waste paper fibre and remove, thus, the ratio that raising waste paper splits into single fiber completely can reduce the difficulty that between waste paper fibre, ink removes.Waste paper pulp after pulping is passed in heat dispersion machine, utilize heat dispersion machine abrasive disc to make rubbing voluntarily between fiber, can promote that waste paper splits into single fiber, and then carry out the operation of flotation step, be about to pass in flotation cell through the waste paper pulp of heat dispersion machine, and interpolation lipase again, now, waste paper has split into single fiber substantially, make the lipase adding can bring into play easily their effect, and needn't be at least that friction in order to increase between waste paper makes its division, and adopt the waste paper pulp of larger concentration, (for example the mass percent concentration of the waste paper pulp in described pulper is 18-20%, or the waste paper pulp mass percent concentration in heat dispersion machine is 25%-28%).
Aborning, can be by may be for different waste paper kinds in pulping step, carry out the separated operation of preliminary waste residue (be also mixed in the foreign material in waste paper or be not suitable for making other materials of paper pulp) separately as a step, in the present invention, this step is slurry purification step, this step can adopt the means of filtration, for example, by unwanted impurity or be not suitable for making other materials (nylon paper of paper pulp, wooden unit, stone soil and iron nail etc.) get rid of, also can further improve heat dispersion machine crumples waste paper fibre, become the ratio of single fiber, in fact, the waste paper sheet of large-size (being for example greater than 0.12mm), even if can not guarantee to be converted into single fiber completely through heat dispersion machine.The present invention has also accelerated the speed of slurry purification, and be about to described slurry purification step and under stress carry out, can be 0.25-0.30Mpa by pressure setting, can guarantee certain purification speed like this, can guarantee clean-up effect again.
For those, escape the impurity of slurry purification, can also in hot dispersion steps, get rid of, for example, the temperature setting of heat dispersion machine is set to 90-100 ℃, make impurity (for example nylon paper) separated with single fiber.
The equipment adopting in following examples all belongs to the general conventional equipment in this area.Wherein, rotary drum pulping machine, conical refiner, pressure slotted screen, heat dispersion machine, polydisc thickener by Austrian An Deli hereby ANDRITZ group company produce, lipase is that Denmark Novozymes Company produces, waste paper used is wastepaper 80%+ papers for books and periodicals 20%.
Embodiment 1
The concrete operations of described deinking process for waste paper are as follows:
Repulping of waste paper: 4000kg wastepaper and 1000kg papers for books and periodicals are inserted in rotary drum pulping machine, add 20m
3water, then add 2.5kg lipase (for waste paper gross weight 0.05%), temperature is 50-60 ℃, rotary drum pulping machine operation 15-20min, pulper hole diameter of sieve (perforated) plate is 4mm, waste paper pulp pH value is 7.0 ~ 8.0;
Slurry purification: the slurry through the preliminary size degradation of rotary drum pulping machine passes in conical refiner, utilize centrifugal force to remove the impurity heavier than fiber, then by the slurry pumping of removing heavy seeds to pressurized screen, get rid of the light impurities such as the scraps of paper that diameter is greater than 0.12mm, nylon paper, entering to starch concentration is 4-5%, pressure is 0.25-0.30Mpa, and pressurized screen screen cylinder stitches wide 0.12mm;
Distributes ink: slurry, through heat dispersion machine, adds steam, utilizes abrasive disc High Rotation Speed, departs from the ink that adheres to fiber, is dispersed into the ink granule that diameter is less than 40um, and control temperature is 90-100 ℃, and slurry concentration is 25-28%.
Floating wash-out China ink: through the slurry of overheated dispersion, the concentration of thin up to 0.8%, enters in floating washing trough, and temperature is 50-60 ℃, adds 2.5kg lipase, utilizes ink different with fiber proportion, makes ink rise to surface removal.
Pulp concentration: use polydisc thickener, being concentrated to concentration is 4.0-5.0% deinking finished pulp.
Embodiment 2-12
According to the method for embodiment 1, repeat 11 tests, the addition that changes lipase, other conditions are constant, and each test is carried out 72 hours continuously, obtain the mean value that Deinking Pulp becomes pulp brightness and residual ink, result is test number as table 1(embodiment numbering subtracts 1).
Table 1
Dirt count of the present invention, how many decisions of basic residual ink in paper pulp, so dirt count can detect by the residual ink in slurry.
Result of the test shows, different lipase consumptions, Deinking Pulp whiteness and residual ink are had to considerable influence, along with lipase consumption increases, Deinking Pulp whiteness and residual ink amount reach after certain value, and improvement effect is just not obvious, considers production cost, so lipase consumption is at 0.05%(also i.e. the 6th group in table 1) time, tool economy.
Wastepaper neutral deinking is exactly the shortcoming for general alkaline environment deinking, does not add NaOH, uses lipase, grease is hydrolyzed, thereby fiber carries out separated with ink.Deinking environment pH value is 7.0 ~ 8.0, reduces the corrosion to equipment, improves production environment, stock quality and pulp-making waste-water processing etc.
Claims (3)
1. a deinking process for waste paper, comprise with pulper and carry out the pulping step of pulping and with flotation cell, waste paper pulp is carried out the flotation step of flotation, it is characterized in that the method also comprises the rubbing waste paper fibre step between pulping step and flotation step, described pulping step comprises the step of adding for the first time deinking agent, described flotation step comprises the step of adding for the second time deinking agent, described deinking agent is lipase, described step of adding for the first time deinking agent comprises to adding and account for the lipase that waste paper percentage by weight is 0.02-0.08% in pulper, described step of adding for the second time deinking agent comprises to adding and account for the lipase that waste paper percentage by weight is 0.02-0.08% in flotation cell, described rubbing waste paper fibre step comprises waste paper pulp is passed in heat dispersion machine, utilize heat dispersion machine abrasive disc to make rubbing voluntarily between fiber, described hot dispersion temperature is 90 ℃-100 ℃, waste paper pulp mass percent concentration in heat dispersion machine is 25%-28%, the method also comprises the waste paper pulp purifying step between pulping step and rubbing waste paper fibre step, described slurry purification step comprises passes through pressurized screen by slurry, the wide 0.12mm that is at least less than of described pressurized screen screen cylinder seam, pressure is 0.25-0.30Mpa, the whiteness of the Deinking Pulp obtaining after flotation step is more than 64ISO%, dirt count is below 150ppm.
2. a kind of deinking process for waste paper according to claim 1, the mass percent concentration that it is characterized in that the waste paper pulp in described pulper is 18-20%.
3. a kind of deinking process for waste paper according to claim 1, the pH value that it is characterized in that described waste paper pulp is 7.0～8.0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210112132.4A CN102605662B (en) | 2012-04-17 | 2012-04-17 | Waste paper deinking method |
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| CN201210112132.4A CN102605662B (en) | 2012-04-17 | 2012-04-17 | Waste paper deinking method |
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| CN102605662B true CN102605662B (en) | 2014-03-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103790062B (en) * | 2012-11-02 | 2016-01-20 | 东莞市绿微康生物科技有限公司 | Complex enzyme improves the method for fine screen efficiency in waste paper pulp-making process |
| CN103882754B (en) * | 2014-03-13 | 2016-01-27 | 宁波六和包装有限公司 | A kind for the treatment of process of paper pulp |
| CN105672054B (en) * | 2016-01-19 | 2017-05-10 | 吉安集团有限公司 | Manila board for red packet paper and preparation method of Manila board for red packet paper |
| CN112663371A (en) * | 2020-12-16 | 2021-04-16 | 江西中竹生物质科技有限公司 | Ultrasonic and biological enzyme collaborative deinking process for packaging paper |
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| CN1312353C (en) * | 2004-11-24 | 2007-04-25 | 深圳市绿微康生物工程有限公司 | New process for lipase waste paper deinking |
| CN101718050B (en) * | 2009-11-13 | 2011-04-06 | 福建省嘉丰生物化工有限公司 | Process for de-inking waste newspaper by biologic enzyme |
| 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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