CN1250832A - Process for treating black paper-making liquid - Google Patents
Process for treating black paper-making liquid Download PDFInfo
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- CN1250832A CN1250832A CN 98111534 CN98111534A CN1250832A CN 1250832 A CN1250832 A CN 1250832A CN 98111534 CN98111534 CN 98111534 CN 98111534 A CN98111534 A CN 98111534A CN 1250832 A CN1250832 A CN 1250832A
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- black liquor
- paper stock
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- black
- storage pool
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Abstract
The treatment method of paper-making black liquor includes the following steps: discharging the cooked black liquor into black liquor storage tank, when it is cooked next time, feeding said black liquor into rotary spherical digester, determining alkali content of black liquor, according to the requirements for cooking, adding caustic soda, and cooking. As compared with existent technology, the said invention possesses the advantages of low production cost, low energy consumption, high output rate and no any environmental pollution.
Description
The present invention relates to a kind of processing method of papermaking waste material.
Papermaking at first must be produced paper pulp earlier, the production process of paper pulp generally is divided into boiling (carrying out), rinsing, bleaches, brightens etc. in rotary spherical digester, to form a large amount of alkali black liquor that contain in the manufacturing process, at present to the processing method of black liquor as discharge of wastewater, there is following weak point in this processing method: 1. needs increase wastewater treatment equipment, and cost of equipment and disposal cost are huge; 2. the caustic soda that contains in the black liquor is raw materials for production, and what abandon is a kind of waste; 3. the substandard black liquor in paper mill enters environment has been caused great pollution, is renovating environment, and many factories can't bear the enormous expenditure of wastewater treatment again, the bankruptcy of having to close the door, large quantities of workman's unemployments.
Purpose of the present invention just is to overcome above-mentioned weak point of the prior art, provides a kind of black liquor that can reclaim to recycle, and saves production cost in a large number, thoroughly changes the processing method of the black liquid of contaminated wastewater situation.
The object of the present invention is achieved like this:
A kind of processing method of black liquid comprises following processing step:
(1) black liquor in the rotary spherical digester after the boiling is entered the black liquor storage pool;
(2) during next boiling, the black liquor in the black liquor storage pool is put into rotary spherical digester, measure the alkalinity of black liquor, the needs according to boiling are added into caustic soda again, carry out boiling.
Also comprise following processing step in addition:
(1) paper stock after the boiling is taken out extruding, the black liquor that squeezes out enters the black liquor storage pool; Then
(2) paper stock of above-mentioned extruding stem is put into service sink and carry out rinsing, paper stock is taken out extruding, the water liquid that squeezes out enters the black liquor storage pool; Then
(3) paper stock after the above-mentioned extruding is put into the bleaching liquor pond and bleach, the paper stock after the bleaching is pushed again, the water liquid that squeezes out enters black liquor storage pool or bleaching liquor wastewater disposal basin.
Adopt 8 to 12 tons press that paper stock is carried out said extruding.
Describe embodiments of the invention below in detail:
Near rotary spherical digester, make some black liquor storage pools according to the daily output demand of each factory, during production, black liquor in the rotary spherical digester after each boiling is directly entered in this black liquor storage pool, and the paper stock after the boiling is taken out extruding, extrusion equipment can adopt press, is advisable with 8 to 12 tons press, and the black liquor that squeezes out also directly enters the black liquor storage pool; Then the paper stock of extruding stem is veered away and carry out rinsing in the service sink, simple agitation once gets final product, and paper stock is taken out extruding more once, and the water liquid that squeezes out also enters the black liquor storage pool; Simultaneously, because rotary spherical digester is in making digestion process the time, the large quantity of moisture in the black liquor in the rotary spherical digester will be evaporated, and therefore the water in the service sink directly can be entered in the black liquor storage pool in right amount to remedy the moisture that is evaporated; The paper stock of above-mentioned rinsing and extruding is put into the bleaching liquor pond again and is bleached, paper stock after the bleaching is pushed again, the water liquid that squeezes out also enters the black liquor storage pool, perhaps also can enter the bleaching liquor wastewater disposal basin and be used for boiling lime usefulness, to improve the whiteness and the insect resistace of lime; Paper stock after the bleaching is sent to and is brightened, paper pulp.Needn't to rotary spherical digester water filling and add caustic soda, but directly black liquor in above-mentioned black liquor storage pool be put into rotary spherical digester during boiling next time, measure the alkalinity of black liquor, needs according to boiling add an amount of caustic soda again, can carry out the boiling of next round, and following step is the same.
Compared with prior art, the inventive method has the following advantages:
1. the black liquor that produces of whole production process is sent in the rotary spherical digester as raw materials for production again Row is produced, and by practice is proved effective interior cycle production process, does not have any waste liquid Discharge, need not any discharging of waste liquid treating apparatus, that has thoroughly stopped to produce thus is tight Heavy problem of environmental pollution;
2. contain alkali in the black liquor, recycling a large amount of employed caustic soda of having saved, experiment Proof, can save caustic soda is 5% to 15%; In addition, paper stock is entering bleaching liquor among the present invention Carried out several extruding of taking turns before bleach in the pond, the required bleaching liquor of paper stock has also obtained in a large number Reduction, experimental results show that and can save bleaching liquor 15% to 20%; Simultaneously, the production of interior circulation Process has been saved again a large amount of waters, so the inventive method greatly reduces production cost;
3. experiment showed, that recycling black liquor also can make the digestion time of rotary spherical digester obtain greatly Big shortening has not only been saved the energy but also improved productivity ratio;
4. the inventive method is simple, builds a new paper mill and needs the several years, and adopt this Inventive method only need increase black liquor storage pool and press to old factory and get final product, and the transformation cycle only Need one to two month to get final product, the inventive method is to transform the reason of existing paper mill, pulp mill Think method.
Claims (3)
1. the processing method of a black liquid is characterized in that comprising following processing step:
(1) black liquor in the rotary spherical digester after the boiling is entered the black liquor storage pool;
(2) during next boiling, the black liquor in the black liquor storage pool is put into rotary spherical digester, measure the alkalinity of black liquor, the needs according to boiling are added into caustic soda again, carry out boiling.
2. the processing method of black liquid according to claim 1 is characterized in that also comprising in addition following processing step:
(1) paper stock after the boiling is taken out extruding, the black liquor that squeezes out enters the black liquor storage pool; Then
(2) paper stock of above-mentioned extruding stem is put into service sink and carry out rinsing, paper stock is taken out extruding, the water liquid that squeezes out enters the black liquor storage pool; Then
(3) paper stock after the above-mentioned extruding is put into the bleaching liquor pond and bleach, the paper stock after the bleaching is pushed again, the water liquid that squeezes out enters black liquor storage pool or bleaching liquor wastewater disposal basin.
3. the processing method of black liquid according to claim 1 and 2 is characterized in that adopting 8 to 12 tons press that paper stock is carried out said extruding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98111534 CN1250832A (en) | 1998-10-14 | 1998-10-14 | Process for treating black paper-making liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98111534 CN1250832A (en) | 1998-10-14 | 1998-10-14 | Process for treating black paper-making liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1250832A true CN1250832A (en) | 2000-04-19 |
Family
ID=5221507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98111534 Pending CN1250832A (en) | 1998-10-14 | 1998-10-14 | Process for treating black paper-making liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1250832A (en) |
Cited By (2)
| 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 |
| CN108755218A (en) * | 2018-06-15 | 2018-11-06 | 三明市缘福生物质科技有限公司 | The implementation method that broken bamboo stews in a kind of bamboo pulp preparation process |
-
1998
- 1998-10-14 CN CN 98111534 patent/CN1250832A/en active Pending
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 |
| CN108755218A (en) * | 2018-06-15 | 2018-11-06 | 三明市缘福生物质科技有限公司 | The implementation method that broken bamboo stews in a kind of bamboo pulp preparation process |
| CN108755218B (en) * | 2018-06-15 | 2023-10-24 | 三明市缘福生物质科技有限公司 | Method for realizing stewing and boiling of broken bamboo in bamboo pulp preparation process |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |