CN1199795A - Papermaking black liquor pollution controlling method through extracting organism and recovering alkali - Google Patents
Papermaking black liquor pollution controlling method through extracting organism and recovering alkali Download PDFInfo
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- CN1199795A CN1199795A CN97112072A CN97112072A CN1199795A CN 1199795 A CN1199795 A CN 1199795A CN 97112072 A CN97112072 A CN 97112072A CN 97112072 A CN97112072 A CN 97112072A CN 1199795 A CN1199795 A CN 1199795A
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- black liquor
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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Abstract
Papermaking black liquor is treated with sulfuric acid to pH 3-4, and then through flocculation, pressing filtration and adsorption, 80% of its organism is extracted. Inorganic substance reacts with sulfuric acid to produce Na2SO4, which is further causticized by lime to obtain NaOH solution for reuse in papermaking, and during the storage of alkali solution, organism is eliminated. The said method is simple and practical, has less investment but high utility and can control pollution thoroughly.
Description
The present invention relates to a method for treating pollution by extracting organic matter from black liquor and recovering alkali. It is especially suitable for small and medium sized paper mill.
In order to solve the pollution of the papermaking black liquor, the world is in attack, and a successful method in nearly a hundred years is combustion method alkali recovery, namely evaporating and concentrating the original black liquor, burning off organic matters, and causticizing the inorganic matters into alkali. However, the method is very expensive and is only suitable for large wood pulp plants, and the problems that the straw pulp paper is difficult to evaporate due to silicon interference, the combustion value is low, the combustion is difficult, and the like cannot be applied to straw pulp paper making.
The invention aims to provide a method for treating and comprehensively utilizing black liquor in a paper mill, which has the advantages of simple and practical process, low investment, high benefit and thorough pollution solution.
The purpose of the invention is realized as follows:
it is characterized by that the organic matter in the black liquor of paper-making is extracted, and the rest inorganic matter is causticized into alkali, and reused in the original paper-making processThe evaporation of the material is called as double recovery method for short, and closed cycle. The specific method comprises directly acidifying paper making raw black liquor, flocculating, filter-pressing, adsorbing filtrate to extract organic substances, causticizing inorganic substances after extracting organic substances into alkali liquor for reuse; the acidification refers to treating the paper-making raw black liquor into a pH value of 3-4 by using sulfuric acid, and the flocculation refers to adding a flocculating agent and the sulfuric acid into the paper-making black liquor at the same time to chelate and coalesce organic suspended matters; then, the organic matters in the papermaking black liquor are extracted by filter pressing; the filtrate adsorption is to adsorb the filter pressing liquid by using active carbon substances; adsorbing the residual organic matters; the recycling of inorganic causticized alkali liquor is to convert inorganic matters in black liquor after acidification treatment into Na2SO4Causticizing with lime to obtain a NaoH solution, and reusing the NaoH solution for papermaking cooking.
The present invention has the advantages of simple and practical technological process, less investment, high benefit and thorough pollution treatment.
The invention will be further described with reference to process flow diagrams and examples below:
FIG. 1 is a process flow diagram of the present invention.
As can be seen from FIG. 1, the whole process is a closed cycle, and all organic and inorganic substances are extracted and fully utilized.
The process features shown in fig. 1 are as follows:
firstly, extracting organic matters:
1. adding sulfuric acid and flocculant to adjust pH to 3-4, wherein the sulfuric acid can change organic substances soluble in alkali but not soluble in acid, such as lignin and part of hemicellulose decomposition product, i.e. polysaccharide substance, into suspended fine particles,flocculating agents to sequester these particles into larger particles to facilitate filtration may be used, and AL may be used as the flocculating agent2(SO4)3、ALCL3And the like. The addition amount of the flocculating agent is 2-3 per mill of the amount of the papermaking black liquor. The above process is carried out at a temperature of 50-80 deg.C, and the suspended particles below 50 deg.C are chelated and coalesced to affect extraction yieldThe temperature is low and can be reached by the natural temperature of hot pulp extrusion, about 55.5 percent of organic matters in the black liquor can be extracted through the process, and the components are mainly lignin filter cakes.
2. The filter pressing liquid is adsorbed by active carbon substances, the least expensive and most widely available active carbon substances are flue dust which is waste of a power plant and can adsorb almost all pigments, and the filter liquid is decolored to the color of tap water, and the filter pressing liquid can adsorb almost all pigments, mainly about 55 percent of soluble polysaccharide through measurement.
Secondly, recovering causticized inorganic matter into alkali liquor:
by H2SO4The black liquor is treated to extract lignin and polysaccharide organic matters, and the combined sodium is converted into mirabilite (Na)2SO4) Residual alkali and sodium silicate (Na)2SiO3) Conversion of iso-sodium salt to Na2SO4。
The above formula shows that the sodium silicate rich in the grass black liquor is changed into silicic acid through reaction with sulfuric acid, the silicic acid is unstable and insoluble in acid liquor, and the silicic acid is rapidly aggregated into multi-molecular insoluble silica gel, and is extracted together in two organic matter extraction processes (more than 80% by determination), thereby effectively overcoming the problem of silicon accumulation.
The acidic filtrate after the organic substance is extracted in this way contains Na as a main component2SO4The causticization of residual acid and other salts, mirabilite is as follows:
the alkali liquor after the gypsum mud is clarified contains 2-3% of alkali, and is reused as a paper-making cooking liquor after a small amount of alkali is supplemented, and the gypsum mud is used for gypsum products or paving roads.
Thirdly, performing anaerobic biochemical treatment on the causticized alkali liquor:
the causticized alkali liquor is stored in a large alkali-resistant storage tank which can ensure 5-day biochemistry, still contains about 1 percent of low-molecular dissolved sugar, is easily digested by anaerobic bacteria, and according to the inspection of the storage tank of an experiment factory, the upper part is full of thick red tea fungus-shaped thalli, so that a small amount of organic matters in the alkali liquor are easily digested by nature, and the accumulation of the organic matters in closed circulation is effectively prevented.
The whole process is in closed cycle, and organic matters and inorganic matters are all extracted and fully utilized.
The method for double-recovery treatment of black liquor from paper making is simple and practical in process, and takes a small paper mill with annual output of 5000 tons as an example, the treatment method only needs 60-100 ten thousand yuan of equipment investment, is the least investment among a plurality of treatment methods, and is also an investment project acceptable by the paper mill.
According to the production and operation data of the laboratory, the extraction rate of black liquor in a paper mill producing 7500 tons of bleached paper per year reaches 70%, the black liquor yield per year is 5.25 ten thousand tons, about 2000 tons of organic matters such as lignin and the like can be extracted, about 1500 tons of alkali can be extracted and recycled, and the field data is basically consistent with the laboratory data.
At present, the market selling price of the lignin is 1000 yuan/T, the selling price of the caustic soda is 2600 yuan/T, and the comprehensive output value is as follows:
wood yield value: 1000 yuan × 2000T 200 ten thousand yuan
Caustic soda yield: 2600 yuan × 1500T 390 ten thousand yuan
Total yield of 200 ten thousand +390 ten thousand yuan to 590 ten thousand yuan
The cost of workers is reduced, the equipment is depreciated, the cost of electricity and materials is 200 ten thousand yuan, and the benefit is 390 ten thousand yuan.
The double-recovery target evaluation of the papermaking black liquor is not three wastes, but is a valuable resource with rich content, and each papermaking factory is connected with a chemical factory for producing organic matters and inorganic matters such as lignin and the like, so that the benefit is not inferior to papermaking.
Organic matter and inorganic matter are recovered and reused, alkali liquor is reused for papermaking and cooking, and the double recovery method thoroughly solves the pollution of black liquor.
Claims (3)
1. A method for extracting organic substance from paper-making black liquor and recovering alkali to treat pollution is characterized by directly acidifying, flocculating and filter-pressing paper-making raw black liquor, adsorbing filtrate to extract organic substance, causticizing inorganic substance after extracting organic substance into alkali liquor for reuse; the acidification refers to treating the paper-making raw black liquor into a pH value of 3-4 by using sulfuric acid, and the flocculation refers to adding a flocculating agent and the sulfuric acid into the paper-making black liquor at the same time to chelate and coalesce organic suspended matters; then, the organic matters in the papermaking black liquor are extracted by filter pressing; the filtrate adsorption is to adsorb the filter pressing liquid by using active carbon substances and adsorb the residual organic matters; the inorganic substance causticization to alkali liquor for recycling refers to the conversion of inorganic substances in the black liquor after acidification treatment into Na2SO4Causticizing with lime to obtain a NaoH solution, and reusing the NaoH solution for papermaking cooking.
2. The method of claim 1, wherein the causticized alkali liquor is subjected to anaerobic biochemical treatment.
3. The method according to claim 2, characterized in that the flocculant is added in an amount of 2-3% of the amount of the papermaking black liquor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97112072A CN1199795A (en) | 1997-05-19 | 1997-05-19 | Papermaking black liquor pollution controlling method through extracting organism and recovering alkali |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97112072A CN1199795A (en) | 1997-05-19 | 1997-05-19 | Papermaking black liquor pollution controlling method through extracting organism and recovering alkali |
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| Publication Number | Publication Date |
|---|---|
| CN1199795A true CN1199795A (en) | 1998-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN97112072A Pending CN1199795A (en) | 1997-05-19 | 1997-05-19 | Papermaking black liquor pollution controlling method through extracting organism and recovering alkali |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427678C (en) * | 2006-12-26 | 2008-10-22 | 上海东升新材料有限公司 | Purifying treating process of paper making green liquid and application of abtained white mud |
| CN102943404A (en) * | 2012-09-29 | 2013-02-27 | 广西大学 | Black liquor treatment method combining lignin extraction and synthesis gas production |
| CN103352389A (en) * | 2013-07-24 | 2013-10-16 | 宜宾海丝特纤维有限责任公司 | Preprocessing method for black liquor in diffusion dialysis recycling pulp manufacture |
| CN103352388A (en) * | 2013-07-24 | 2013-10-16 | 宜宾海丝特纤维有限责任公司 | Preprocessing technology for black liquor in diffusion dialysis recycling pulp manufacture |
| CN103408010A (en) * | 2013-07-26 | 2013-11-27 | 福建农林大学 | Method for preparing activated carbon by using papermaking black liquor as active agent |
| CN105019291A (en) * | 2015-08-11 | 2015-11-04 | 怀宁县天元纸业有限公司 | Papermaking black liquid treatment method |
| CN109677742A (en) * | 2019-01-31 | 2019-04-26 | 汕头市柏瑞纸品包装厂有限公司 | A kind of carton box |
-
1997
- 1997-05-19 CN CN97112072A patent/CN1199795A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427678C (en) * | 2006-12-26 | 2008-10-22 | 上海东升新材料有限公司 | Purifying treating process of paper making green liquid and application of abtained white mud |
| CN102943404A (en) * | 2012-09-29 | 2013-02-27 | 广西大学 | Black liquor treatment method combining lignin extraction and synthesis gas production |
| CN103352389A (en) * | 2013-07-24 | 2013-10-16 | 宜宾海丝特纤维有限责任公司 | Preprocessing method for black liquor in diffusion dialysis recycling pulp manufacture |
| CN103352388A (en) * | 2013-07-24 | 2013-10-16 | 宜宾海丝特纤维有限责任公司 | Preprocessing technology for black liquor in diffusion dialysis recycling pulp manufacture |
| CN103352388B (en) * | 2013-07-24 | 2015-10-28 | 宜宾海丝特纤维有限责任公司 | The pretreating process of black digestion liquid in pulp manufacture is reclaimed in a kind of diffusion dialysis |
| CN103352389B (en) * | 2013-07-24 | 2016-06-29 | 宜宾海丝特纤维有限责任公司 | The preprocess method of black digestion liquid during pulp manufactures is reclaimed in a kind of diffusion dialysis |
| CN103408010A (en) * | 2013-07-26 | 2013-11-27 | 福建农林大学 | Method for preparing activated carbon by using papermaking black liquor as active agent |
| CN103408010B (en) * | 2013-07-26 | 2016-05-11 | 福建农林大学 | A kind of black liquid that utilizes is prepared the method for active carbon for activating agent |
| CN105019291A (en) * | 2015-08-11 | 2015-11-04 | 怀宁县天元纸业有限公司 | Papermaking black liquid treatment method |
| CN109677742A (en) * | 2019-01-31 | 2019-04-26 | 汕头市柏瑞纸品包装厂有限公司 | A kind of carton box |
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