CN1059644C - Treating method for black liquor of pape-making - Google Patents
Treating method for black liquor of pape-making Download PDFInfo
- Publication number
- CN1059644C CN1059644C CN96100718A CN96100718A CN1059644C CN 1059644 C CN1059644 C CN 1059644C CN 96100718 A CN96100718 A CN 96100718A CN 96100718 A CN96100718 A CN 96100718A CN 1059644 C CN1059644 C CN 1059644C
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- CN
- China
- Prior art keywords
- black liquor
- liquor
- making
- paper
- adds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- 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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The present invention relates to a method for treating papermaking black liquor, which is particularly suitable for the comprehensive control and the utilization of alkaline straw pulp black liquor. The method uses phosphonic acid or phosphate to acidify the papermaking black liquor, polyacrylamide is added into the papermaking black liquor for flocculation, lignin and organic matters are filtered and separated, clear liquor is continuously treated by activated sludge to decompose the organic matters, lime is added into the clear liquor for causticization to recover alkali liquor, and sediments are added with phosphonic acid or sulfuric acid to produce phosphate fertilizer. The treating method is adopted, the separated lignin and pulp residues generated in a papermaking process are used for manufacturing a fiber board, the alkali liquor is recovered for circular use, the sediments are used for manufacturing the soluble phosphate fertilizer, and the comprehensive utilization is really realized.
Description
The present invention relates to a kind for the treatment of paper-making black liquor, belong to sewage disposal technology, be particularly useful for the comprehensive regulation and the utilization of alkaline straw pulp black liquor.
The improvement of black liquid is the difficult problem of domestic and international environmental protection, general treatment process sulfuric acid, carbonic anhydride, stack gas, SO
2Deng the acidifying black liquor, extract xylogen, acid out liquid is through the recyclable a part of alkali of lime alkalization, and the problem that these treatment processs exist is that the active princlple in the black liquor fails to make full use of, and Pollution abatement is not thorough etc.
The object of the present invention is to provide a kind of method that fully utilizes black liquid, the pollution that can solve black liquid, the while can make full use of the novel method of the active princlple in the black liquor again.
Technology contents of the present invention is achieved in that
A. black liquid is acidified to pH value 2 ± 0.5 with phosphoric acid or phosphoric acid salt, adds the xylogen in the polyacrylamide flocculation black liquor again, hemicellulose and other organism, filtering separation;
The isolating clear liquor of b.a method adds superfluous lime in 70--90 ℃ of alkalization 1-2 hour, reclaims alkali lye, thick screenings making fiberboard in separating lignin and organism and the pulping and paper-making in a method.
C. reclaim that throw out behind the alkali lye adds phosphoric acid or sulfuric acid obtains phosphate fertilizer.
In order to improve the alkali lye rate of recovery, clear liquor after a operation is handled can add lime and regulate pH value 5--6, carry out carrying out alkalinisation treatment again behind aerobic treatment or the remaining organism of anaerobically fermenting processing decomposition with active sludge, the condition of aerobic treatment is inflation 3--4 hour, the condition of anaerobically fermenting is 32--34 ℃, ferments 3--5 days.
The add-on of flocculation agent polypropylene amine is 1--5PPM in the above-mentioned treating processes, and normal temperature is handled.
Adopt papermaking treatment process of the present invention, isolated xylogen can be made fiberboard with the screenings produced in the paper-making process, the alkali lye recycling use, and throw out is used to make soluble phosphoric manure.Really accomplished comprehensive utilization.
Describe technology contents of the present invention in detail below in conjunction with embodiment.
Embodiment:
A. acid out: straw pulp black liquor H
3PO
4Or NaH
2PO
4Being acidified to pH value is about 2, cationic polyacrylamide with 300--500 about ten thousand makes xylogen and the flocculation of other organism precipitation as flocculation agent at normal temperatures, with common separation equipment such as decker or pressure filter separating lignin and other organogenous sediments, treatment effect sees Table 1.
Table 1, acid out liquid and black liquor composition be g/L relatively
The isolated xylogen of acid out and organism precipitation can be made fiberboard, the N in the acid out liquid simultaneously with thick screenings in the pulping and papermaking processes, fiber fines etc.
a +Ion is with N
aH
2PO
4Formation exist, be recyclable sodium salt owing to contain nutrient substances such as N, P in the acid out liquid, can be next step biological treatment and lay good basis.
B. decomposing organic matter: acid out liquid adds lime and regulates pH value 5--6, adopts active sludge treatment 3--4 hour, decomposes residual organic matter, BOD
5Clearance can reach 85%, and the COD clearance reaches more than 45%;
If adopt anaerobic digestion, working temperature is 32--34 ℃, and liquid residence time is 4 days, BOD
7But clearance 87%, COD clearance can reach more than 63%, for next step alkalization lays the first stone.Employing activated sludge process decomposing organic matter can improve the rate of recovery of alkali lye in the treatment process of the present invention, but the corresponding raising of processing cost.
C. alkalization: carry out in the clear liquor of alkalization process after active sludge decomposes, the alkalization condition is 115% of a theoretical amount for the lime input amount, and temperature is 70--80 ℃, and the time is 1--2 hour, and the alkalization rate can reach more than 90%.Alkali recovery is more than 60%.
D. production of phosphate fertilizer: the throw out Ca after will alkalizing
3(PO
4)
2Add H
2SO
4Or H
3PO
4Produce calcium superphosphate or double superphosphate, become commodity through slaking, drying.
Claims (3)
1, a kind for the treatment of paper-making black liquor is at first to use the acidifying black liquor, adds polyacrylamide flocculant in black liquor, separates the solid substance of flocculation, and acid out liquid carries out alkalinisation treatment again, it is characterized in that:
A. black liquid is acidified to pH value 2 ± 0.5 with phosphoric acid or phosphoric acid salt, adds the xylogen in the polyacrylamide flocculation black liquor again, hemicellulose and other organism, filtering separation;
B. add superfluous lime in the clear liquor in 70-90 ℃ of alkalization 1-2 hour, reclaim alkali lye, thick screenings in a method in separating lignin and organism and the pulping and paper-making or paper waste are made fiberboard;
C. reclaim that throw out behind the alkali lye adds phosphoric acid or sulfuric acid obtains phosphate fertilizer.
2, treating paper-making black liquor according to claim 1, it is characterized in that the clear liquor after a operation is handled adds lime adjusting pH value 5-6, carry out aerobic or anaerobically fermenting with active sludge, decomposing remaining organism alkalizes again, the condition of aerobic treatment is inflation 3-4 hour, the condition of anaerobically fermenting is 32-34 ℃, ferments 3-5 days.
3, treating paper-making black liquor according to claim 1, the add-on that it is characterized in that polyacrylamide is 1-5PPM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96100718A CN1059644C (en) | 1996-01-31 | 1996-01-31 | Treating method for black liquor of pape-making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96100718A CN1059644C (en) | 1996-01-31 | 1996-01-31 | Treating method for black liquor of pape-making |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1156126A CN1156126A (en) | 1997-08-06 |
| CN1059644C true CN1059644C (en) | 2000-12-20 |
Family
ID=5116691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96100718A Expired - Fee Related CN1059644C (en) | 1996-01-31 | 1996-01-31 | Treating method for black liquor of pape-making |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1059644C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085757C (en) * | 1999-05-27 | 2002-05-29 | 孙海明 | Process for removing lignin from black liquor in making paper by soda pulping |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100358811C (en) * | 2003-08-26 | 2008-01-02 | 山东泉林纸业有限责任公司 | Process for extracting lignin by acid separation |
| CN100402556C (en) * | 2006-03-03 | 2008-07-16 | 才景志 | Sodium carboxymethyl hemicellulose with paper-making black liquor as raw material and producing method thereof |
| CN102616878B (en) * | 2012-03-29 | 2013-08-21 | 上海东升新材料有限公司 | Pretreatment separating agent of straw pulping black liquor |
| CN103771632B (en) * | 2012-10-23 | 2016-12-21 | 中国石油化工股份有限公司 | A kind of preprocess method of cellulose alcoholic fermentation waste liquid |
| CN103669071B (en) * | 2013-12-05 | 2016-04-06 | 乐山市洁宇纳米应用技术研究所 | A kind of processing method of black liquid |
| CN105000742A (en) * | 2015-07-29 | 2015-10-28 | 河南工业大学 | Waste alkali solution recycling method |
| CN108864441A (en) * | 2017-10-13 | 2018-11-23 | 济宁明升新材料有限公司 | A method of extracting lignin from reducing rules treatment fluid |
| CN108864440A (en) * | 2017-10-13 | 2018-11-23 | 济宁明升新材料有限公司 | A method of extracting lignin from alkaline pulping black liquor |
-
1996
- 1996-01-31 CN CN96100718A patent/CN1059644C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085757C (en) * | 1999-05-27 | 2002-05-29 | 孙海明 | Process for removing lignin from black liquor in making paper by soda pulping |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1156126A (en) | 1997-08-06 |
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