CN85108206A - Processing of recovery of alkaline from straw pulp black lye in method of green lye sulfite - Google Patents
Processing of recovery of alkaline from straw pulp black lye in method of green lye sulfite Download PDFInfo
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- CN85108206A CN85108206A CN 85108206 CN85108206A CN85108206A CN 85108206 A CN85108206 A CN 85108206A CN 85108206 CN85108206 CN 85108206 CN 85108206 A CN85108206 A CN 85108206A CN 85108206 A CN85108206 A CN 85108206A
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- chemical pulp
- semi
- alkali
- liquor
- lye
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Abstract
Processing of recovery of alkaline from straw pulp black lye in method of green lye sulfite adopts green liquor to add Na
2SO
3Be cooking liquor.Reduced SiO in the black liquor
2The viscosity of content and black liquor makes straw chemical pulp, semi-chemical pulp and other careless class semi-chemical pulp black liquor can carry out alkali and reclaims.This technology is compared with traditional alkali recovery process has following advantage: cancellation causticization operation, do not produce, the white clay secondary pollution, simple for process, saving is invested, is cut down the consumption of energy, and better solves straw chemical pulp, semi-chemical pulp and other careless class semi-chemical pulp alkali and reclaims problem.
Description
The invention belongs to slurrying and alkali recovery process method in the pulp and paper industry.
The pollution sources 90～95% in paper mill are from pulping and digesting black liquor, in order to reduce alkali and heat energy, the sulfate process that general common employing is traditional or the alkaline process black liquor alkali recovery process in pollution and the recovery black liquor.But straw pulp black liquor is owing to the silicone content height, and viscosity is big, adopts traditional alkali recovery process difficulty bigger.Particularly the black liquor of the semi-chemical pulp of straw chemical pulp, semi-chemical pulp and other careless classes still can not carry out the alkali recovery with traditional method.
Carry out the green liquor sodium sulfite in paper mill, Xuanhua, Hebei in 1979 and added the pilot production that NaOH system kaoliang stalk is starched and alkali reclaims, the kaoliang stalk slurry black liquor that the evidence green liquid sodium sulfite method can will still not have recovery method carries out the alkali recovery, but owing to the NaOH that still need add in the cooking liquor about 5%, promptly can not all green liquor partly need be carried out causticization like this, still have partly white clay secondary pollution with the green liquor boiling.
The evaporation test of 1981～nineteen eighty-two, the people live in plenty in the Zhejiang paper mill the carried out green liquor sodium sulfite adds neutral sulfity process waste liquid (promptly adding sodium lignosulfonate) system straw semi-chemical pulp and black liquor.The proof green liquid sodium sulfite method adds production and the alkali recovery that the neutral sulfity process waste liquid can be used for the straw semi-chemical pulp.But sodium lignosulfonate is not domestic facile raw material, so method is unfavorable for promoting.
Main points of the present invention are to adopt green liquor to add Na
2SO
3Be cooking liquor, make straw chemical pulp, semi-chemical pulp and other careless class semi-chemical pulp black liquor can carry out alkali and reclaim and do not have the causticization operation do not have the white clay secondary pollution.
Adopt green liquor to add Na
2SO
3For cooking liquor is actual is to adopt Na
2CO
3, Na
2S, Na
2SO
3Three kinds of medicines.Alkali reclaims gained green liquor (Na
2CO
3+ Na
2S) replenish small amount of N a
2SO
3, addition is 3～8% pairs of over dry raw materials, is back to boiling, need not causticization.Na
2SO
3In boiling reuse process, synthesize sodium lignosulfonate, in combustion furnace, be reduced to Na with lignifying
2S is the component part of green liquor.Boiling at the end, the PH of black liquor is 9～10Na
2SiO
3When PH10.2, be easy to be hydrolyzed into H
2SiO
3Colloid.So early stage of cooking is by the Na of fibrous raw material stripping
2SiO
3, at the end will hydrolysis in boiling, by the filtration of black liquor before evaporation, can remove partly H when removing fiber fines
2SiO
3, black liquor dewatered SiO 2～8 hours through 80 ℃ of insulations in accumulator tank
2Will be deposited in the black liquor trench bottom, the sediment volume is different and different with raw material variety, but can both dwindle the sediment volume at 80 ℃.Because 80 ℃ is the better temperature of flocculation sediment, can quicken sinking speed, reduce bacterial reproduction, thereby can avoid because the further generation precipitation that the black liquor corruption causes.So just finished the silica removal effect.The sediment volume generally＜10% can be discharged by bottom land.If reclaiming wherein, black liquor then needs to separate white residue and fubril heteroproteose cell and lignin mixed sediment with decanter type continuous discharging slag centrifuge.
The green liquid sodium sulfite method black liquor has only SiO when evaporation
2With a large amount of other impurity, the pale brown look soft junction dirt that constitutes as fubril, heteroproteose cell lignin and other inorganic matters is easy to remove.This black liquor uses the venturi clogging seldom when burning.
Green liquid sodium sulfite method cooking liquor character is than NaOH gentleness, and hemicellulose hydrolysis stripping five carbon candys when boiling are less in the raw material, thereby paper pulp yield is higher, and can reduce black liquor viscosity greatly.
Just because of green liquid sodium sulfite method has reduced SiO in the black liquor
2The viscosity of content and black liquor just makes the black liquor of straw chemical pulp, semi-chemical pulp and other careless class semi-chemical pulps can carry out alkali and reclaims.The present invention compares with traditional black liquor alkali recovery process, owing to need not causticization, is 4 procedures thereby make alkali reclaim 6 procedure letters.Its technological process is: straw raw material is adorned the pot boiling after the chaffcutter dedusting, to the over dry blade, (wherein green liquor 12.5～13.5%, and sodium sulfite 2.5% is amounted to pure Na in NaOH for chemical pulp alkali charge total alkali 15～16%
2SO
34%), (wherein green liquor 10～11%, and sodium sulfite 2% is amounted to pure Na for semi-chemical pulp alkali charge total alkali 12～13%
2SO
33.1%) each real estate straw kind difference.Can stretch slightly ± 1.5% alkali charge.Well-done slurry is delivered to washing room, and the gained black liquor send evaporation section rare black liquor storage tank behind vacuum filter.Be incubated 2～8 hours down at 80 ℃ and discharge 6～10% sediments.Upper clear supernate is delivered to multi-effect evaporator and is concentrated, and adds small amount of N aOH to keep effective alkali 3～4g/l in the black liquor, to guarantee no longer to produce precipitation in half concentrated black liquid.The concentrated black liquid that is come out by evaporimeter is controlled at＞22 ° of Be (95 ℃), Gu shape content send combustion furnace workshop section for～37%.Further being concentrated to 30 ° Bes (95 ℃) solid content through venturi cyclone evaporator or unit dish evaporimeter with the direct contact of alkali stove institute smoke discharging at this is～50%, advance the stove burning then, burning gained melts is dissolved in water (or in rare black liquor) promptly becomes green liquor (Na
2CO
3+ Na
2S), green liquor adds Na
2SO
3Also to replenish some Na in case of necessity
2CO
3Be used further to boiling.
The present invention is except being applicable to that straw chemical pulp, semi-chemical pulp slurrying and alkali reclaim, and the semi-chemical pulp alkali that also is suitable for careless classes such as wheat straw, kaoliang stalk, reed, cotton stalk, flax bar, bagasse reclaims.To the over dry blade, wherein green liquor 14～15% in NaOH for the total alkali charge 18～19% of wheat straw semi-chemical pulp, sodium sulfite 3.2%, the total alkali charge 15% of kaoliang stalk semi-chemical pulp in NaOH to the over dry blade, green liquor 13% sodium sulfite 2% wherein.
The present invention compares with original sulfate process and soda processes alkali recovery process has following advantage: do not have the causticization operation, do not produce the white clay secondary pollution, simple for process, save investment, cut down the consumption of energy, solved the problem that still can not reclaim straw chemical pulp semi-chemical pulp and other careless class semi-chemical pulp black liquor alkali recovery preferably.
Claims (3)
1. the process that reclaims of grass fiber slurrying and alkali is characterized in that not having the causticization operation.
2. according to described grass fiber slurrying of claim 1 and alkali recovery process, it is characterized in that cooking liquor is that green liquor adds Na
2SO
3
3. it is characterized in that being suitable for semi-chemical pulps such as straw chemical pulp, semi-chemical pulp and wheat straw, kaoliang stalk, reed, cotton stalk, flax bar, bagasse according to described grass fiber slurrying of claim 1 and alkali recovery process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85108206 CN85108206A (en) | 1985-11-11 | 1985-11-11 | Processing of recovery of alkaline from straw pulp black lye in method of green lye sulfite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85108206 CN85108206A (en) | 1985-11-11 | 1985-11-11 | Processing of recovery of alkaline from straw pulp black lye in method of green lye sulfite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85108206A true CN85108206A (en) | 1987-05-20 |
Family
ID=4795939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85108206 Pending CN85108206A (en) | 1985-11-11 | 1985-11-11 | Processing of recovery of alkaline from straw pulp black lye in method of green lye sulfite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85108206A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100510247C (en) * | 2007-07-13 | 2009-07-08 | 五原县大民财纸业有限责任公司 | Black liquor recovery agent for pulp making process |
| CN103696310A (en) * | 2014-01-13 | 2014-04-02 | 南京林业大学 | Wheat straw sulfate pulping and alkali recovery efficiency improving method |
-
1985
- 1985-11-11 CN CN 85108206 patent/CN85108206A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100510247C (en) * | 2007-07-13 | 2009-07-08 | 五原县大民财纸业有限责任公司 | Black liquor recovery agent for pulp making process |
| CN103696310A (en) * | 2014-01-13 | 2014-04-02 | 南京林业大学 | Wheat straw sulfate pulping and alkali recovery efficiency improving method |
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|---|---|---|---|
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |