CN1114011C - Alkaline pulping process of wheel straw without drainage of black liquid - Google Patents
Alkaline pulping process of wheel straw without drainage of black liquid Download PDFInfo
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- CN1114011C CN1114011C CN 01115000 CN01115000A CN1114011C CN 1114011 C CN1114011 C CN 1114011C CN 01115000 CN01115000 CN 01115000 CN 01115000 A CN01115000 A CN 01115000A CN 1114011 C CN1114011 C CN 1114011C
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- CN
- China
- Prior art keywords
- black liquor
- light yellow
- sodium silicate
- yellow water
- alkaline pulping
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000010902 straw Substances 0.000 title claims abstract description 10
- 238000004537 pulping Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 title claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 26
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229920005610 lignin Polymers 0.000 claims abstract description 16
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 10
- 241000209140 Triticum Species 0.000 claims abstract description 8
- 235000021307 Triticum Nutrition 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 6
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 239000002912 waste gas Substances 0.000 claims description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 6
- 235000011152 sodium sulphate Nutrition 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 2
- 230000008929 regeneration Effects 0.000 claims description 2
- 238000011069 regeneration method Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 1
- 239000006260 foam Substances 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 2
- 235000019353 potassium silicate Nutrition 0.000 abstract 3
- 238000003916 acid precipitation Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
本发明涉及造纸废液的处理方法，尤其是对麦草碱法制浆产生的黑液的综合处理方法。首先用聚丙烯酰胺作为絮凝剂以酸析的方法分离木素，然后用硅酸钠固化淡黄水，将得到的固化物用于生产水玻璃，生产出的水玻璃又可以作为固化淡黄水的固化剂，剩余部分可以出售获利，水玻璃的生产过程中产生的尾气可以导入到黑液吸收塔中，由黑液吸收其中的二氧化碳、二氧化硫等有害成分。投资少、运行费用低、无二次污染。
The invention relates to a treatment method for papermaking waste liquor, in particular to a comprehensive treatment method for black liquor produced by alkaline pulping of wheat straw. First, polyacrylamide is used as a flocculant to separate lignin by acid precipitation, and then the light yellow water is solidified with sodium silicate, and the obtained cured product is used to produce water glass, and the produced water glass can be used as solidified light yellow water The remaining part can be sold for profit, and the tail gas produced during the production of water glass can be introduced into the black liquor absorption tower, where the black liquor absorbs harmful components such as carbon dioxide and sulfur dioxide. Less investment, low operating costs, no secondary pollution.
Description
The invention relates to a method for treating paper-making waste liquor, in particular to a method for comprehensively treating black liquor generated by wheat straw alkaline pulping.
At present, straw pulp papermaking occupies a very important position in China, waste water (black liquor) generated in the papermaking process is always an important pollution source of environmental pollution, and two methods for treating the black liquor are generally adopted: one is to add acid into black liquor to carry out neutralization reaction, then precipitate, filter and recover lignin, and discharge sewage after biological fermentation, and the defects are that alkali in the sewage cannot be recovered, the sewage still contains more pollutants, and the pollution to the environment is great. The other method is to concentrate the black liquor, then to spray-burn, then to hydrolyze, then to filter, causticize into liquid alkali to recover. The method burns out 70% of organic matter in black liquor, and has large investment, low benefit and white mud pollution. The two methods can not realize the zero emission of harmful substances and are not easy to popularize and utilize.
The invention aims to provide a method for zero discharge of wheat straw alkaline pulping black liquor, which has the advantages of high extraction rate of lignin, no secondary pollution, no black liquor discharge and low operation cost.
The purpose of the invention is realized as follows:
firstly, sending the squeezed black liquor into an absorption tower, then sending into a dissolving tank for dissolving a flocculating agent polyacrylamide, extracting lignin, and then carrying out the following steps: A) curing light yellow water, namely mixing the light yellow water after lignin separation with sodium silicate according to a certain proportion, standing to cure the light yellow water, and drying a cured substance to be used as a raw material for producing sodium silicate in the next step; B) regenerating the curing agent, drying the cured product, measuring the content of sodium sulfate and silicon dioxide in the cured product, adding corresponding components, and placing the cured product in a reflecting furnace for producing sodium silicate.
As a further improvement of the invention, before extracting lignin in black liquor by polyacrylamide and sulfuric acid, waste gas containing sulfur dioxide and carbon dioxide generated in the production process of sodium silicate is led into a black liquor absorption tower, the sulfur dioxide and the carbon dioxide react with residual alkali in the black liquor, the pH value of the black liquor after absorbing the waste gas is reduced to 6-8, and then the lignin is extracted.
As a further improvement of the invention, sodium silicate with the modulus of more than 2.5 is mixed with the light yellow water for solidification in the solidification process of the light yellow water, and the mass ratio of the sodium silicate to the light yellow water is (0.37-0.03): 1.
As a further improvement of the invention, in the regeneration process of the curing agent, the mass ratio of the sodium sulfate, the carbon and the silicon dioxide in the cured material is 1 to (0.02-0.04) to (0.4-1.7) by adding corresponding components.
The method for treating the papermaking black liquor mainly has the following advantages: 1) the method firstly treats the papermaking black liquor with acid to extract lignin, then completely solidifies the light yellow water after the lignin is extracted, the dried condensate is used for producing liquid sodium silicate, and the waste gas containing sulfur dioxide and carbon dioxide generated in the production process is absorbed by the thick black liquor, so that the whole production process has no discharge of any black liquor, no discharge of waste gas such as sulfur dioxide and the like, and no secondary pollution thoroughly. 2) The product after the condensate is dried is added with a proper amount of quartz sand and coal powder for producing the sodium silicate, the price is low, the production technology is mature, and compared with the current common alkali recovery technology, the method has the advantages of low equipment investment, low operation cost and no secondary pollution. Because the use of the sodium silicate is wide, the produced sodium silicate can be sold for profit except for being used as a curing agent for curing light yellow water. 3) The black liquor is used for absorbing the waste gas generated in the process of producing the sodium silicate, so that the waste gas can be prevented from polluting the environment, the pH value of the black liquor can be reduced, the hydrolysis of polyacrylamide and the use amount of sulfuric acid in the subsequent process can be reduced, and the operation cost is further reduced.
The invention is further illustrated by the following detailed description in conjunction with the drawings in which:
the figure is a process flow diagram of oneembodiment of the present invention.
Example (b):
the method comprises the steps of producing 300 tons of black liquor with COD of more than 8 ten thousand per day, absorbing tail gas generated by reaction in a reverberatory furnace when the black liquor passes through an absorption tower, reducing the pH value of the black liquor to about 8, adding 24.75 kilograms of flocculating agent polyacrylamide into one fourth of the black liquor, slowly stirring for 4 hours in a dissolving tank to completely dissolve polyacrylamide in the black liquor, and feeding the black liquor dissolved with the polyacrylamide into a mixer. In the section A of the mixer, the black liquor dissolved with polyacrylamide and the residual black liquor after tail gas absorption are fully mixed in the section A according to the volume ratio of 1: 4 and then enter the section B of the mixer. And adding 93% sulfuric acid into the section B, uniformly mixing to make the pH value of the black liquor be 1, and conveying the black liquor into an inclined-net type lignin separator through a pipeline. 127.5 tons of wet lignin containing 80 percent of water and 172.5 tons of light yellow water can be obtained, and the extraction rate of lignin is as high as 90 percent. 172.5 tons of light yellow water with the pH value of 1 and the sodium silicate with the modulus of 3 sequentially enter a static mixer according to the mass ratio of 1: 0.125, are fully mixed in the mixer, and generate chemical reaction, and the chemical reaction equation is as follows:
since silica sol is extremely unstable in an acidic medium, it rapidly coagulates to form silica gel. Therefore, after the sodium silicate is mixed with the light yellow water, the mixture can flow into a curing pool forcuring within 30 seconds, the curing time is about 5 minutes, the cured substance is dried to obtain 21 tons of solid slag containing 12 tons of sodium sulfate and 7.3 tons of silicon dioxide, 7.9 tons of quartz sand and 0.5 ton of coal powder, the raw materials are continuously placed in a reverberatory furnace after being uniformly mixed, the reaction temperature is 1500 ℃, the crushed material is discharged after 5 hours of reaction and enters a material melting device for melting, and 23 tons of sodium silicate with the modulus of 3.0-3.2 are produced. A part of the water is used as a curing agent for curing light yellow water, and the rest can be sold for profit. The tail gas generated in the reverberatory furnace in the process of producing the sodium silicate can be guided into the absorption tower, so that the black liquor absorbs the tail gas, and the pH value of the black liquor is reduced.
In the process of producing the sodium silicate, the sodium sulfate, the silicon dioxide and the carbon are adjusted in proportion and the production process can produce the sodium silicate with the modulus of 1-4, and the sodium silicate can be used for curing light yellow water, but the curing time and effect of the sodium silicate with different moduli are slightly different, and the sodium silicate is not detailed here.
Claims (4)
1. A method for zero discharge of black liquor in wheat straw alkaline pulping comprises a process of extracting lignin by using sulfuric acid and polyacrylamide, and is characterized in that: the method also comprises the following processes of A) curing the light yellow water, mixing the light yellow water after lignin separation and liquid sodium silicate according to a certain proportion, standing to cure the light yellow water, and drying cured substances to be used as raw materials for producing the sodium silicate in the next step; B) regenerating the curing agent, drying the cured product, measuring the content of sodium sulfate and silicon dioxide in the cured product, adding corresponding components, and placing the cured product in a reflecting furnace for producing sodium silicate.
2. The method for zero discharge of black liquor in alkaline pulping of wheat straw according to claim 1, characterized in that: before extracting lignin by polyacrylamide and sulfuric acid, waste gas containing sulfur dioxide and carbon dioxide generated in the production process of soda foam is introduced into a black liquor absorption tower, so that the sulfur dioxide and the carbon dioxide react with residual alkali in the black liquor, the pH value of the black liquor after absorbing the waste gas is reduced to 6-8, and then the lignin is extracted.
3. The method for zero discharge of black liquor in wheat straw alkaline pulping according to claim 1 or 2, characterized in that: in the process of curing the light yellow water, sodium silicate with the modulus of more than 2.5 and the light yellow water are mixed and cured, and the mass ratio of the sodium silicate to the light yellow water is (0.37-0.03): 1.
4. The method for zero discharge of black liquor in alkaline pulping of wheat straw according to claim 1, characterized in that: in the regeneration process of the curing agent, the mass ratio of the sodium sulfate, the carbon and the silicon dioxide in the cured material is 1 to (0.02-0.04) to (0.4-1.7) by adding corresponding components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115000 CN1114011C (en) | 2001-05-30 | 2001-05-30 | Alkaline pulping process of wheel straw without drainage of black liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115000 CN1114011C (en) | 2001-05-30 | 2001-05-30 | Alkaline pulping process of wheel straw without drainage of black liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1317610A CN1317610A (en) | 2001-10-17 |
| CN1114011C true CN1114011C (en) | 2003-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01115000 Expired - Fee Related CN1114011C (en) | 2001-05-30 | 2001-05-30 | Alkaline pulping process of wheel straw without drainage of black liquid |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300412C (en) * | 2004-08-11 | 2007-02-14 | 山东泉林纸业有限责任公司 | Acid separated filtrate treating method for paper-making black liquor |
| CN100439255C (en) * | 2006-08-23 | 2008-12-03 | 刘忠 | Process of extracting and utilizing solid matter of wheat straw pupl black liquid |
| JP5440199B2 (en) * | 2010-01-19 | 2014-03-12 | 栗田工業株式会社 | Silicon wafer etching wastewater treatment method and treatment apparatus |
| CN113998683A (en) * | 2021-11-26 | 2022-02-01 | 大唐东北电力试验研究院有限公司 | Method for trapping and utilizing biomass hydrothermal carbonization coupling carbon |
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| CN1317610A (en) | 2001-10-17 |
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