CN1648335A - Method for treating and reusing pulp bleaching waste water in size washing - Google Patents
Method for treating and reusing pulp bleaching waste water in size washing Download PDFInfo
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- CN1648335A CN1648335A CN 200510008693 CN200510008693A CN1648335A CN 1648335 A CN1648335 A CN 1648335A CN 200510008693 CN200510008693 CN 200510008693 CN 200510008693 A CN200510008693 A CN 200510008693A CN 1648335 A CN1648335 A CN 1648335A
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Abstract
During the pulping process comprising pressurizing sodium hydroxide digestion of wheat straw, washing pulp and bleaching, the pulp washing effluent and the bleaching effluent are mixed, heated and stirred to react to produce turbid lignocalcium liquid; the liquid is filtered to separate lignocalcium in the filter dreg and clear liquid; the lignocalcium is burnt; and the clear liquid is reused for digesting wheat straw in the spherical boiler, in pulp squeezer, in diluting pond for diluting slurry and in bleaching pond. The present invention has the positive effects of lowering chemical consumption, reducing waste water drainage and saving water resource. The present invention is suitable for making paper with straw.
Description
Technical field
The invention belongs to the dogstail method for making paper pulp, be applied to Industrial Wastewater Treatment and reuse in the pulping process flow, the waste water recycling that specially refers to the association with pulp bleaching operation is in the processing of pulp washing water.
Background technology
Traditional grass pulping technological process is in the pressure-bearing rotary spherical digester, makes dogstail and particular chemical aqueous solvent react the water insoluble paper pulp that becomes of grass fiber, the water-soluble cooking waste liquor that becomes of other material under the condition of pressurization of heating.The existing multiple pulp grinder of carrying can separating pulp and cooking waste liquor, the using method of various device is different with extraction efficiency, and the separating degree of paper pulp and cooking waste liquor can reach 70%-85% and not wait, and all needs water to wash to waste liquid residual quantity≤5%, through bleaching, just can be used for papermaking again.The water yield of pulp washing water is big, and concentration is low, and COD content height very is difficult to handle, and is the emphasis difficult problem of pulping and papermaking industry pollution control.
Known now pulp washing method for treating water has a variety of: as: flocculence, acid-precipitation method, metal ion displacement method or the like.If the water reuse after will handling is then passed over its pH value to pulp washing, all methods all can be used, if will be back to use the preparation cooking liquor, then require to be advisable with the metal ion displacement method for alkalescence.
The example of analyzing the metal ion displacement method is to buy leftover bits and pieces CaCl from Sodium Carbonate Plant
2The aqueous solution or crystallization water solid, reaction principle be with its water-soluble Ca ion under corresponding condition with pulp washing water in the Na ion generation displacement reaction of lignin sodium, generate lignin calcium and NaCl, lignin calcium is water insoluble, and precipitate and separate is burned and can be disposed the lignin pollution.
Though bleaching waste liquor is light slightly than waste wash liquor to natural pollution, also be a kind of not treated can not be to the industrial wastewater of nature discharging.
Analyze the preparation of bleaching liquid and the chemical reaction in the use, can learn it is to add water with quick lime to generate white lime-Ca (OH)
2, precipitation is separated out clear liquid and is blown into chlorine again, generates bleaching liquid-calcium hypochlorite Ca (ClO)
2, be added to the bleaching that is used for paper pulp in the natural-color straw pulp.It is the unstability of using calcium hypochlorite that bleaching is handled, and decomposites atomic state oxidation agent the straw pulp fiber is played discoloration, generates CaCl simultaneously
2Be the discarded object of this procedure, do not discharge to nature as treated, can influence ecological environment.
Summary of the invention
The objective of the invention is to design a kind of method for the treatment of and reusing pulp bleaching waste water in size washing, utilize useless bleaching liquor rare black liquor direct and pulp washing water of bleached pulp to react, make the Na ion of lignin sodium in the pulp washing water wherein and the Ca ion in the useless bleaching liquor carry out ion exchange, generate water-fast lignin calcium, solid, liquid separates the back burning disposal and falls the filter residue pollution sources, filtrate recycle is to boiling wheat straw and pulp washing, form many recycles of industrial wastewater, save great lot of water resources, save the expense of the outsourcing medicament of pulp washing processing, reduce the cost of slurrying and pollution treatment.
Technical scheme of the present invention is, a kind of method for the treatment of and reusing pulp bleaching waste water in size washing, by wheat straw, caustic soda pressure cooking, the pulping process that pulp washing, bleaching process are formed mixes, heats, stirs the pulp washing waste liquid and the bleaching waste liquor of its generation, reaction generates lignin calcium turbid solution, filter out filter residue-lignin calcium, burning disposal filters out clear liquid and is back to use boiling dogstail, shove, dilution, pulp washing and joins bleaching liquid once more.Concrete steps are:
Add wheat straw and based on the cooking liquor of caustic soda by rotary spherical digester (1), add that steam is heated, pressure cooking goes out fiber and the mixture of cooking liquor,
Spurt to jetting storehouse (2),
Fall into press master 1 (3), extrude raw black liquid, it is pending to flow to raw black liquid pond (4);
Extract slurry behind a small amount of reuse liquid diluting, enter press master 2 (5), extrude rare black liquor, it is pending to flow into dilute black liquid pond (6);
Extract slurry after diluting tank (7) dilutes with reuse liquid again, sieve, pump into draining vat (9) pulp washing through screen(ing) machine (8),
The stock pump of cleaning is gone into the bleaching liquid reaction of bleaching cistern (10) and bleaching liquor pond (11) input, generates bleached pulp (finished product slurry), press dry into bleaching dry pulp plate through paperboard machine (12),
Waste liquid in draining vat (9) and the bleaching cistern (10) is sent into reactive tank (13) in proportion, mixing, heat, displacement reaction taking place under the stirring condition and generate lignin calcium turbid solution, pumps into filter (14),
Filter (14) leaches filter residue-lignin calcium, and burning disposal is fallen pollution sources,
Filter out clear liquid and be back to use rotary spherical digester (1) and boil wheat straw, be back to use the press master dilution, sieve (8) and pulp washing (9) after being back to use diluting tank (7) diluted pulp, be back to use bleaching liquor pond (11) and join bleaching liquid again.
Whole flow process only adds clear water when joining bleaching liquid, rare black liquor of raw black liquid (4) (6) and filter residue (10) are taken liquid out of.
Good effect of the present invention is, the expense of utilizing the method for pulp bleaching effluent direct reuse Treatment of Washing pulp-water not only to save the outsourcing medicament, also saved the disposal cost of bleaching water, and accomplished recycling of waste water more, saved water resource in large quantities for discharging.During the dogstail system of being applicable to paper pulp, pulp bleaching effluent is back to the processing of pulp washing water.
Description of drawings
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the process chart of the method for the treatment of and reusing pulp bleaching waste water in size washing,
Specific implementation method
As seen from Figure 1, pulping process flow adds wheat straw by rotary spherical digester (1) and based on the cooking liquor of caustic soda, adds that steam is heated, pressure cooking goes out fiber and the mixture of cooking liquor,
Spurt to jetting storehouse (2), fall into press master 1 (3), extrude raw black liquid, it is pending to flow to raw black liquid pond (4);
Extract slurry behind a small amount of reuse liquid diluting, enter press master 2 (5), extrude rare black liquor, it is pending to flow into dilute black liquid pond (6);
Extract slurry after diluting tank (7) dilutes with reuse liquid again, sieve, pump into draining vat (9) pulp washing through screen(ing) machine (8),
The stock pump of cleaning is gone into bleaching cistern (10), and the bleaching liquid reaction with bleaching liquor pond (11) input generates bleached pulp (finished product slurry), press dry into bleaching dry pulp plate through paperboard machine (12).
Waste liquid in draining vat (9) and the bleaching cistern (10) is sent into reactive tank (13) in proportion, mix, heat, reacting under the stirring condition generates lignin calcium turbid solution, pumps into filter (14).
Filter (14) leaches filter residue-lignin calcium, and burning disposal is fallen to pollute,
Filter out clear liquid and be back to use rotary spherical digester (1) and boil wheat straw, be back to use press master and dilute in right amount, sieve (8) and pulp washing (9) after being back to use diluting tank (7) diluted pulp, be back to use bleaching liquor pond (11) and join bleaching liquid once more.
Whole flow process only adds clear water when joining bleaching liquid, rare black liquor of raw black liquid (4) (6) and filter residue (10) are taken liquid out of.The liquid measure cyclic balance is seen attached list:
Liquid measure cyclic balance table (m
3/ ton oven dry stock)
| Sequence number | Operation | Feed liquor amount (source) | Reuse liquid measure (source) | Liquid outlet quantity (whereabouts) |
| 1 | Rotary spherical digester | 2m 3(steam condensation water) | 7m 3(from-14) | 9m 3(going-2) |
| 2 | Jetting storehouse | 9m 3(from-1) | 9m 3(going-3) | |
| 3 | | 9m 3(from-2) | 4m 3(going-4) (extruding rate 45%) 5m 3(going-5) | |
| 4 | The raw black liquid pond | 4m 3(from-4) | 4m 3(pending) | |
| 5 | | 5m 3(from-3) | 4m 3(from-14) | 4m 3(going-6) (extruding rate 45%) 5m 3(going-7) |
| 6 | Dilute black liquid pond | 4m 3(from-5) | 4m 3(pending) | |
| 7 | Diluting tank | 5m 3(from-5) | 30m 3(from-14) | 35m 3(going-8) |
| 8 | Sieve | 35m 3(from-7) | 35m 3(going-9) | |
| 9 | Draining vat | 35m 3(from-8) (from-11) | 2.7m 3(going-10) (raw black liquid volume 9m 330%) 32.3m 3(going-13) | |
| 10 | Bleaching cistern | 2.7m 3(from-9) 43m 3 | 45.7m 3(going-12) | |
| 11 | The bleaching liquor pond | 8m 3Clear water | 35m 3(from-14) | 43m 3(going-10) |
| 12 | The paperboard machine | 45.7m 3(from-10) | 44.7m
3(going-13) 1m
3(taking out of) (slurries were than 1: 1) with | |
| 13 | Reactive tank | 32.3m 3(from-9) 44.7m 3(from-12) | 77m 3(going-14) | |
| 14 | Filter | 77m 3(from-13) | 41m 3(go-1.5.7) 35m 3(going-11) 1m 3(slag liquor ratio 1: 1) (taking out of) with slag |
Claims (2)
1, a kind of method for the treatment of and reusing pulp bleaching waste water in size washing, by wheat straw, caustic soda pressure cooking, pulp washing, the pulping process that bleaching process is formed is characterized in that, the pulp washing waste liquid and the bleaching waste liquor of its generation mixed, heats, stirs, reaction generates lignin calcium turbid solution, filter out filter residue-lignin calcium, burning disposal filters out clear liquid and is back to use boiling, shove, dilution and joins bleaching liquid once more.
2, the method of a kind for the treatment of and reusing pulp bleaching waste water in size washing as claimed in claim 1, it is characterized in that, waste liquid in draining vat (9) and the bleaching cistern (10), send into reactive tank (13) in proportion, mixing, heat, displacement reaction takes place under the stirring condition, generate lignin calcium turbid solution, pump into filter (14), filter out filter residue-lignin calcium, burning disposal is fallen the lignin pollution sources, filters out clear liquid and is back to use rotary spherical digester (1) and boils wheat straw, is back to use press master and dilutes in right amount, sieve (8) and pulp washing (9) after being back to use diluting tank (7) diluted pulp, be back to use bleaching liquor pond (11) and join bleaching liquid once more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510008693 CN1648335A (en) | 2005-03-04 | 2005-03-04 | Method for treating and reusing pulp bleaching waste water in size washing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510008693 CN1648335A (en) | 2005-03-04 | 2005-03-04 | Method for treating and reusing pulp bleaching waste water in size washing |
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|---|---|---|---|
| CN 200510008693 Pending CN1648335A (en) | 2005-03-04 | 2005-03-04 | Method for treating and reusing pulp bleaching waste water in size washing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747640A (en) * | 2012-07-10 | 2012-10-24 | 烟台兴达新型环保材料开发有限公司 | Method for recycling raffinate and sewage caused by papermaking and pulping |
| CN104178957A (en) * | 2014-08-08 | 2014-12-03 | 青岛利康源医疗器械有限公司 | Medical gauze bleaching and rinsing wastewater recovery use process |
| CN107268315A (en) * | 2017-08-08 | 2017-10-20 | 邓州市华鑫纸业有限公司 | A kind of pulping and paper-making new method using Chinese alpine rush as raw material |
-
2005
- 2005-03-04 CN CN 200510008693 patent/CN1648335A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747640A (en) * | 2012-07-10 | 2012-10-24 | 烟台兴达新型环保材料开发有限公司 | Method for recycling raffinate and sewage caused by papermaking and pulping |
| CN104178957A (en) * | 2014-08-08 | 2014-12-03 | 青岛利康源医疗器械有限公司 | Medical gauze bleaching and rinsing wastewater recovery use process |
| CN107268315A (en) * | 2017-08-08 | 2017-10-20 | 邓州市华鑫纸业有限公司 | A kind of pulping and paper-making new method using Chinese alpine rush as raw material |
| CN107268315B (en) * | 2017-08-08 | 2019-10-25 | 邓州市华鑫纸业有限公司 | It is a kind of using Chinese alpine rush as the pulp and paper making method of raw material |
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