CN1247248A - Non-pollution pulping and paper-making technology with circulation of all waste liquid - Google Patents
Non-pollution pulping and paper-making technology with circulation of all waste liquid Download PDFInfo
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- CN1247248A CN1247248A CN 99115044 CN99115044A CN1247248A CN 1247248 A CN1247248 A CN 1247248A CN 99115044 CN99115044 CN 99115044 CN 99115044 A CN99115044 A CN 99115044A CN 1247248 A CN1247248 A CN 1247248A
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Abstract
A pulping and paper-making technology without environmental pollution features that its waste water is fully circulated and it integrates the pulping, rinsing, sewage treatment and chemical materials recovery into a whole. At ordinary pressure and in a certain temp range, multi-stage separation and sedimentation and multi-stage black liquid treatment are used to separate the active components from impurities in black liquid and decoloure them. The active components can be cyclically used. The washing water and white liquid are circulated or drained.
Description
The present invention relates to a kind of method of wastewater treatment, the free of contamination papermaking method of particularly a kind of waste water complete alternation.
Along with the raising of industrialization degree, industrial pollution is serious day by day, jeopardizes the development of human survival and modern civilization.Paper waste is one of main industrial pollution, heavy damage ecological environment.Along with the pay attention to day by day of people,, also pay attention to day by day the wastewater treatment of paper industry to environmental protection.Existing pulp and paper industry wastewater treating technology is mainly huge by investment, the modern comfort of complex technical process extracts high concentration liquid, and make it to reach incendivity concentration by concentrating step by step, send into incinerator burning organic principle then, flooding residue again, reclaim the inorganic raw material in the slag, leaching liquid adds an amount of inorganic raw material to working concentration and is used further to material cooking by causticization after the standing separation.Its major technique defective is:
1. improve the energy consumption that liquid waste concentration directly influences pollution control technology, must extract high-concentration waste liquid by modern comfort and complicated technical process.In the technical equipment and the investment capacity of at present domestic existing common paper plant, be difficult to reach necessary liquid waste concentration with reasonable energy consumption.Certainly will cause investment excessive and introduce huge modern comfort, the cost of technology and production cost significantly rise, and product loses the market competitiveness.
2. spent pulping liquor complicated component, viscosity are big, heat transfer coefficient is extremely low, and rule are horizontal down reasonably producing, and further the equipment heat transfer area of concentrating spent liquor is huge, and is expensive big, energy consumption height, industrial expense height.Though and the burning of concentrate reduced the pollution to water, increased the pollution to atmosphere newly.
3. because the component difference of all kinds of raw materials is big, slurry water filtering performance difference, old technology equipment is to raw material sources, type requirements strictness, bad adaptability.
4. contain multiple complicated ingredient owing to forage, the sediment charge height, slurries filtration is poor, and old technology equipment is not suitable for handling straw pulp waste water.
5. concentrator complex structure, the apparatus and process maintenance cost is huge.
In view of above reason, domestic existing papermaking enterprise all is difficult to carry out waste water treatment project under the reasonable production cost, closes so that a large amount of papermaking enterprise is forced to stop production under the situation that environmental requirement improves.State-run large-scale paper plant can't develop domestic abundant forage resource under present domestic timber resource shortage situation, main dependence on import wood pulp is produced, and makes country expend a large amount of foreign exchanges, and enterprise's production cost is increased.
In operation 1 straw is shredded, after the dry method slagging-off, fine fodder is sent in the preimpregnation equipment, through operation 2 preliminary treatment: added each 5% (to the over dry material) liquor ratio of CaO and NaOH 1: 10, CaO: NaOH=1: 1, the heat of mixing give soak (80～90 ℃), 120 minutes, detect and to remove lignin, total impurities 〉=15% (press the over dry material calculates), through operation 3: push separating slurry and black liquor.Slurry is through operation 4: send in the boiling container of cooking process 5 after the boiling batching, add 8%NaOH, liquor ratio 1: 5, boiling is spurted after pulping requires, and slurries are through operation 6 mechanical separation, and slurry is through operation 7: send operation 8 after the multi-stage countercurrent washing: bleaching, slurry after the bleaching is through operation 9: after the multi-stage countercurrent washing, slurry through the screening, rinsing is after operation 10: join after the making beating slurry, the accent dense, send operation 11: copy paper paper machine and copy paper.The black liquor that pretreatment process 2 and extruding separation circuit 3 are produced is through operation 13, preliminary treatment black liquor hierarchical processing: black liquor is acidified to pH=6.5 through the boiler exhaust gas neutralization, sedimentation, mechanical separation impurity, use CaO causticization rear decoloring again, sedimentation, mechanical separation, parting liquid add polyacrylamide (0.1%) cohesion decolouring, sedimentation, mechanical separation.Liquid is through operation 12: complete alternation is used for operation 2 after the pretreatment fluid allotment: preliminary treatment.Black digestion liquid through operation 6 mechanical separation carries out the black digestion liquid hierarchical processing through operation 15, i.e. causticization after boiler exhaust gas acidifying, sedimentation, separation, decolouring, sedimentation again, decolouring, separate, liquid adds flocculating agent: aluminum sulfate 0.3%, decolouring once more, sedimentation, separation, through operation 14: after the cooking liquor allotment, complete alternation is used for cooking process 5.Operation 7: the Heisui River hierarchical processing is washed through operation 16 in the Heisui River that multi-stage countercurrent washing produces, after acidifying, causticization, separation, decolouring, through operation 17: after handling water and regulating, replenish the circulation fluid concentration adjustment that is used for pretreatment process 2 or cooking process 5.To operation 9: Heisui River and operation 11 that the multi-stage countercurrent washing produces: copy white liquid that paper produces, through operation 18: washings, plain boiled water, multistep treatment distribute: add inorganic or organic flocculating agent, as complete alternation use or part qualified discharge after polyacrylamide (0.1%) flocking settling, decolouring, the separation.The slag charge that operation 1 is produced is after 2 extruding separate slag charge that the slag charge that produces and machine hand's preface 11 produce and carry out integrated treatment with pretreatment process, as the fertile field of going back of organic composite slag.
The purpose of this invention is to provide the free of contamination papermaking method of a kind of waste water complete alternation.
The objective of the invention is to be achieved through the following technical solutions: waste water complete alternation papermaking, comprise get the raw materials ready, preliminary treatment, boiling, washing rinsing and machine hand's preface.In normal pressure and certain temperature range (30～100 ℃), raw material is carried out alkaline preliminary treatment pH 〉=10, time: 10～180 minutes, remove part lignin and impurity, the two accounts for 5～40% of over dry material, extruding separating slurry and black liquor, slurry is to cooking process, and the black liquor that preliminary treatment produces carries out hierarchical processing: through acid waste gas or corresponding inorganic acid acidification to pH≤6.5, sedimentation, mechanical separation slag liquid, to pretreatment fluid CaO causticization, absorption, slagging-off, decolouring, adding flocculating agent through in the liquid of above processing, flocking settling, adsorption bleaching is to removing pigment impurity 〉=70%, the liquid that obtains is after allotment, and complete alternation is used for preliminary treatment.Black liquor after the alkaline boiling is carried out hierarchical processing: after sour gas, polyvalent metal oxides or its composite salt hierarchical processing, sedimentation, decolouring, make liquid decoloration, take off assorted 〉=70%, processing water is allocated the back complete alternation be used for cooking process.Multi-stage countercurrent washing Heisui River complete alternation after sedimentation processing, mechanical separation is used for pretreatment fluid allotment and cooking liquor allotment.The poaching wastewater that slurrying, bleaching are produced, the washing Heisui River of copying white liquid of paper and countercurrent washing are carried out multistep treatment and are distributed: be used to bleach the countercurrent washing of disposed slurry or join the dense or qualified discharge of slurry accent with circulation after sedimentation agent sedimentation, mechanical separation, the allotment.But float preceding surplus washings and float back washings, white liquid mixed processing or processing respectively.After the slag charge that produces after the slag charge of procedure for preparation dry removal, pretreatment process extruding separated the slag charge that produces and copy paper carries out integrated treatment, as the fertile also field of organic composite slag.
Compare with prior art, the present invention has following outstanding advantage:
1. technology is simple, easy to operate, is easy to grasp.
2. invest little, instant effect, remarkable benefit.
3. pollution treatment combines with pulping process, and the pollution treatment cost descends and non-secondary pollution.
4. the water complete alternation after handling is used, and has avoided the waste of water resource, has saved the energy.
5. the present invention does not have the significant difference of existing all kinds of pulping process equipment in raw material, paper kind, when production scale changes, need only adjust each step process condition, is convenient to production management and realizes automation, so adapt to wide.
Fig. 1 is the process flow diagram that process of the present invention adopts.
Now, the present invention is further described in conjunction with Fig. 1 and embodiment.
Embodiment:
Claims (3)
1, a kind of waste water complete alternation papermaking, comprise get the raw materials ready, preliminary treatment, boiling, washing, rinsing and machine hand's preface, it is characterized in that:
A. in normal pressure and certain temperature range, raw material is carried out alkaline preliminary treatment: pH 〉=10, remove part lignin and impurity, the two accounts for 5～40% of over dry material, and extruding separating slurry and black liquor, slurry be to cooking process,
B. the black liquor that a. is produced carries out hierarchical processing, and after pretreatment fluid was allocated, complete alternation to pretreatment process used,
C. the black digestion liquid that alkaline boiling is produced carries out allocating after the hierarchical processing, and complete alternation to cooking process uses,
D. the Heisui River that washing produces to multi-stage countercurrent is after sedimentation processing, mechanical separation, and complete alternation is used for pretreatment fluid allotment and cooking liquor allotment,
E. after the multistep treatment allotment was carried out in the poaching wastewater that slurrying, bleaching are produced and washing Heisui River of copying white liquid of paper and countercurrent washing, circulation was used to bleach the countercurrent washing of disposed slurry or the dense or qualified discharge of sizing mixing,
F. the slag charge that the slag charge of procedure for preparation dry removal, pretreatment process are produced and copy paper after after the slag charge that produces carries out integrated treatment, as the fertile also field of organic composite slag.
2, a kind of waste water complete alternation papermaking according to claim 1 is characterized in that:
A. temperature is in 30～100 ℃ of scopes, and alkaline pretreatment time is 10～180 minutes,
B. black liquor pH≤6.5 after acid waste gas or inorganic acid acidifying of producing of preliminary treatment, sedimentation, mechanical separation slag liquid,
C. the CaO causticization of the liquid after b. handles, absorption, slagging-off, decolouring,
D. the liquid after c. handles adds flocculating agent flocking settling, absorption, decolouring to removing pigment, impurity 〉=70%, and the liquid that obtains is after allotment, and complete alternation is used to give pretreatment process,
E. the black liquor that alkaline boiling produces, through sour gas, polyvalent metal oxides or its composite salt hierarchical processing, sedimentation, make liquid decoloration, take off assorted 〉=70%, to after handling water and allocating, complete alternation is used for cooking process.
3, a kind of waste water complete alternation papermaking according to claim 1 and 2, it is characterized in that: temperature is in 80～90 ℃ of scopes, and alkaline pretreatment time is 120 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99115044 CN1247248A (en) | 1999-07-29 | 1999-07-29 | Non-pollution pulping and paper-making technology with circulation of all waste liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99115044 CN1247248A (en) | 1999-07-29 | 1999-07-29 | Non-pollution pulping and paper-making technology with circulation of all waste liquid |
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| CN1247248A true CN1247248A (en) | 2000-03-15 |
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| CN 99115044 Pending CN1247248A (en) | 1999-07-29 | 1999-07-29 | Non-pollution pulping and paper-making technology with circulation of all waste liquid |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357517C (en) * | 2005-10-14 | 2007-12-26 | 山东轻工业学院 | Pretreatment liquid of cotton rod boiling |
| CN101899795A (en) * | 2010-08-16 | 2010-12-01 | 中国林业科学研究院林产化学工业研究所 | Method for improving utilization ratio of chemi-mechanical pulp bleaching filtrate |
| CN101688362B (en) * | 2007-06-15 | 2013-07-03 | 安德里兹公司 | Method for treating liquid flows at a chemical pulp mill |
| US8632657B2 (en) | 2007-06-15 | 2014-01-21 | Andritz Oy | Method for treating liquid flows at a chemical pulp mill |
| US8632655B2 (en) | 2007-06-15 | 2014-01-21 | Andritz Oy | Method in connection with the washing of pulp at a chemical pulp mill |
| CN112645635A (en) * | 2020-12-03 | 2021-04-13 | 安徽皖科新科技发展有限公司 | Concrete additive processing device and method |
-
1999
- 1999-07-29 CN CN 99115044 patent/CN1247248A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357517C (en) * | 2005-10-14 | 2007-12-26 | 山东轻工业学院 | Pretreatment liquid of cotton rod boiling |
| CN101688362B (en) * | 2007-06-15 | 2013-07-03 | 安德里兹公司 | Method for treating liquid flows at a chemical pulp mill |
| US8632657B2 (en) | 2007-06-15 | 2014-01-21 | Andritz Oy | Method for treating liquid flows at a chemical pulp mill |
| US8632655B2 (en) | 2007-06-15 | 2014-01-21 | Andritz Oy | Method in connection with the washing of pulp at a chemical pulp mill |
| US8632656B2 (en) | 2007-06-15 | 2014-01-21 | Andritz Oy | Method for treating liquid flows at a chemical pulp mill |
| CN101899795A (en) * | 2010-08-16 | 2010-12-01 | 中国林业科学研究院林产化学工业研究所 | Method for improving utilization ratio of chemi-mechanical pulp bleaching filtrate |
| CN112645635A (en) * | 2020-12-03 | 2021-04-13 | 安徽皖科新科技发展有限公司 | Concrete additive processing device and method |
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