CN1271038A - Rice and wheat straw replacing and digesting technoloy and equipment - Google Patents
Rice and wheat straw replacing and digesting technoloy and equipment Download PDFInfo
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- CN1271038A CN1271038A CN 99105787 CN99105787A CN1271038A CN 1271038 A CN1271038 A CN 1271038A CN 99105787 CN99105787 CN 99105787 CN 99105787 A CN99105787 A CN 99105787A CN 1271038 A CN1271038 A CN 1271038A
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Abstract
The present invention relates to a straw pulp making method in paper making industry. The stepping replacement and digestion pulp-making process includes four successive steps of material preparation, first replacing and digesting, second replacing, and digesting, and pulp washing and cold exhaust. The intermittent digesting balls used in the process are one with filtering net below material inlet and liquid exhaust pipe welded to one side of the filtering net. The present invention can obtain high-quality and high-strength rice and wheat straw pulp and uses straw pulp black liquor repeatedly to reduce exhausted waste liquor and protect environment.
Description
The invention belongs to the technology of making straw pulp in the paper industry, particularly a kind of paddy and wheat grass replacing and digesting technoloy and equipment thereof.
China's paddy and wheat grass is to adopt traditional alkaline process or the conventional digesting technoloy of sulfate process of decades at present, its main method is that fibrous raw materials such as paddy and wheat grass and alkalescence or sulphate cook soup are added in the batch cooking rotary spherical digester together, feed steam, intensification, venting, heat up again, be incubated and carry out delignification reaction, thereby make the paddy and wheat straw pulp; This method cooking reaction is violent, and the paddy and wheat straw pulp intensity of boiling is low, and drainability is poor, and especially the black digestion liquid silicone content of alkaline process paddy and wheat straw pulp is big, and the viscosity height causes paddy and wheat straw pulp black liquor recovery rate low, and alkali recovery is low and reclaim the cost height of alkali.Seriously influence the enforcement of straw, Straw Pulp alkali recovery technology.This traditional digesting technoloy, its discharging black liquor is to form one of present China industrial wastewater primary pollution source.
Purpose of the present invention provides a kind of paddy and wheat grass classification replacing and digesting technoloy and device therefor thereof with regard to being to overcome above-mentioned the deficiencies in the prior art, this technology can be deviate from lignin by different level under the reaction condition that relaxes.
As above design, technical scheme of the present invention is:
A kind of paddy and wheat grass replacing and digesting technoloy, it is characterized in that: adopt the pulping process of classification displacement cooking, it comprises following step successively:
1., get the raw materials ready: expect behind the dry raw material preparation of routine on the paddy and wheat grassland, it is carried out wet method again and rub the grass processing with the hands.
2., one-level displacement cooking: the material of the paddy and wheat grassland after the above-mentioned processing is put into the batch cooking rotary spherical digester after dewatering, with temperature is that 120～140 ℃ liquor ratio is 1: 4.5～7, alkali charge is that 50%～70% first stage boiling liquid of whole digestion process total alkali content cements out the water in the raw material, and heating simultaneously makes the temperature of first stage boiling liquid reach more than 130 ℃;
3., secondary displacement cooking: adding temperature in above-mentioned first stage boiling liquid is 135～155 ℃, liquor ratio is 1: 4.5～7, alkali charge is whole digestion process total alkali content 30%～50% secondary cooking liquor, thereby first stage boiling liquid is displaced, and secondary cooking liquor temperature is heated to 150 ℃ and with its insulation; This moment, pulping added displacement liquid after the secondary cooking liquor, and the secondary cooking liquor is displaced;
4., washing behind the pulping and cold spurting: in above-mentioned batch cooking rotary spherical digester, add the cleaning solution of temperature about 80 ℃ above-mentioned displacement liquid is cemented out; This cleaning solution carries out pulp washing and with its cold spurting in rotary spherical digester.
Used batch cooking rotary spherical digester in the described paddy and wheat grass replacing and digesting technoloy is to set up a screen pack in the bottom of the charging aperture of existing rotary spherical digester and connect a discharging tube at a face down bonding of screen pack.
The liquor ratio of described first stage boiling liquid is 1: 6.5, and alkali charge is 60% of a whole digestion process total alkali content.
The liquor ratio of described secondary cooking liquor is 1: 6.5, and alkali charge is that 40% superiority of the present invention of whole digestion process total alkali content is: 1, can obtain high-quality, high-intensity paddy and wheat straw pulp.The paste colors that utilizes this process to make is shallow, and slurry matter is even, the little (KMnO of difference of hardness
4± 0.5～0.8), unscreened yield is at 50%-53%, the drainability of slurry good (20～25 ° of SR), weight in wet base 9-108.The physical property of slurry is example with the wheat straw: tensile index 68.4-74.2N-m
2/ 8, fracture length 6.96～7.56Km burst index, 3.9-4.2KPa.m
2/ 8, tear index 4.0～4.8N.m
2/ 8.2, the paddy and wheat straw pulp black liquor of displacement cooking can repeatedly repeat to be back to pulping by cooking, thereby has reduced blowdown effectively, has protected environment.Paddy and wheat grass displacement cooking, all can obtain 80～90 ° temperature, residual alkali reaches the black liquor of 8～108/l, carrying out tens of black liquor recovery cooking tests through special topic finds: the pulping of boiling does not produce the hyperchromicity that progressively increases, the concentration of black liquor, residual alkali, the accumulation and the inspissation of solid content are slow, black liquor is light, does not have precipitation, does not have sticking mark.
The invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing 1 is a process flow diagram of the present invention.
Accompanying drawing 2 is a process chart of the present invention.
Accompanying drawing 3 is the structural representation of rotary spherical digester.
Embodiment:
A kind of paddy and wheat grass replacing and digesting technoloy, the pulping process of employing classification displacement cooking in the hope of under the reaction condition that relaxes, is deviate from lignin by different level.It comprises following step successively:
1, gets the raw materials ready: behind the frequent conventional dry raw material preparation of paddy and wheat grassland material, again it is carried out wet method and rub careless the processing with the hands, but except that the leaf in the forage, awns, marrow etc., greatly reduce silicone content effectively, help alkali and reclaim.
2, one-level displacement cooking: the material of the paddy and wheat grassland after the above-mentioned processing is put into the batch cooking rotary spherical digester after dewatering, with temperature is 130 ℃, liquor ratio is 1: 6.5,60% the first stage boiling liquid that alkali charge accounts for whole digestion process total alkali content cements out discharge with the water in it, simultaneously indirect make the temperature of first stage boiling liquid reach 130 ℃ with and with its insulation ten minutes.
3, secondary displacement cooking: adding temperature in above-mentioned first stage boiling liquid is 150 ℃, liquor ratio is the secondary cooking liquor that 1: 6.5, alkali charge account for whole digestion process total alkali content 40%, thereby first stage boiling liquid is replaced in the first stage boiling liquid container, and being incubated 15 minutes with the temperature indirect to 150 of secondary cooking liquor ℃ and with it, this moment is pulping.After the secondary boiling, add displacement liquid, the secondary cooking liquor is replaced in the secondary cooking liquor container.
4, washing behind the pulping and cold spurting: add the cleaning solution of temperature about 80 ℃ in above-mentioned batch cooking rotary spherical digester displacement liquid is replaced in the displacement slot, this cleaning solution carries out pulp washing the temperature of starching is dropped to below 100 ℃ in rotary spherical digester, and with its cold spurting.
Used batch cooking rotary spherical digester in the above-mentioned paddy and wheat grass replacing and digesting technoloy is to set up a screen pack 2 in the bottom of the charging aperture 1 of existing rotary spherical digester and connect a discharging tube 3 at a face down bonding of screen pack.
The I and II cooking liquor that this process displaces injects fresh alkali lye, and heat temperature raising is ready for next ball displacement cooking again, can be repeatedly used, but keep residual alkali (free alkali) after certain boiling, the number of times that is repeatedly used is determined by field condition.Equally, displacement liquid and cleaning solution also can repeatedly repeat displacement and washing under heat-retaining condition.
Claims (4)
1, a kind of paddy and wheat grass replacing and digesting technoloy, it is characterized in that: adopt the pulping process of classification displacement cooking, it comprises following step successively:
1., get the raw materials ready: expect behind the dry raw material preparation of routine on the paddy and wheat grassland, it is carried out wet method again and rub the grass processing with the hands.
2., one-level displacement cooking: the material of the paddy and wheat grassland after the above-mentioned processing is put into the batch cooking rotary spherical digester after dewatering, with temperature is that 120～140 ℃ liquor ratio is 1: 4.5～7, alkali charge is that 50%～70% first stage boiling liquid of whole digestion process total alkali content cements out the water in the raw material, and heating simultaneously makes the temperature of first stage boiling liquid reach more than 130 ℃;
3., secondary displacement cooking: adding temperature in above-mentioned first stage boiling liquid is 135～155 ℃, liquor ratio is 1: 4.5～7, alkali charge is whole digestion process total alkali content 30%～50% secondary cooking liquor, thereby first stage boiling liquid is displaced, and secondary cooking liquor temperature is heated to 150 ℃ and with its insulation; This moment is pulping.After the secondary boiling, add displacement liquid, the secondary cooking liquor is displaced;
4., washing behind the pulping and cold spurting: in above-mentioned batch cooking rotary spherical digester, add the cleaning solution of temperature about 80 ℃ above-mentioned displacement liquid is cemented out; This cleaning solution carries out pulp washing and with its cold spurting in rotary spherical digester.
2, employed batch cooking rotary spherical digester in the paddy and wheat as claimed in claim 1 grass replacing and digesting technoloy comprises charging aperture, it is characterized in that, adds a screen pack in the charging aperture bottom, connects a discharging tube at a face down bonding of screen pack.
3, paddy and wheat grass replacing and digesting technoloy as claimed in claim 1, it is characterized in that: the liquor ratio of described first stage boiling liquid is 1: 6.5, alkali charge is 60% of a whole digestion process total alkali content.
4, paddy and wheat grass replacing and digesting technoloy as claimed in claim 1, it is characterized in that: the liquor ratio of described secondary cooking liquor is 1: 6.5, alkali charge is 40% of a whole digestion process total alkali content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99105787 CN1271038A (en) | 1999-04-16 | 1999-04-16 | Rice and wheat straw replacing and digesting technoloy and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99105787 CN1271038A (en) | 1999-04-16 | 1999-04-16 | Rice and wheat straw replacing and digesting technoloy and equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1271038A true CN1271038A (en) | 2000-10-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99105787 Pending CN1271038A (en) | 1999-04-16 | 1999-04-16 | Rice and wheat straw replacing and digesting technoloy and equipment |
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| CN (1) | CN1271038A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451235C (en) * | 2006-05-22 | 2009-01-14 | 李国林 | Paper pulp manufacturing process and equipment |
| CN101748635A (en) * | 2010-03-18 | 2010-06-23 | 白雪刚 | Method for preparing slurry by replacement cooking |
| CN101691711B (en) * | 2009-04-30 | 2012-10-03 | 山东福荫造纸环保科技有限公司 | Natural-color straw pulp with improved freeness, tensile index and folding strength, and stable performance |
-
1999
- 1999-04-16 CN CN 99105787 patent/CN1271038A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451235C (en) * | 2006-05-22 | 2009-01-14 | 李国林 | Paper pulp manufacturing process and equipment |
| CN101691711B (en) * | 2009-04-30 | 2012-10-03 | 山东福荫造纸环保科技有限公司 | Natural-color straw pulp with improved freeness, tensile index and folding strength, and stable performance |
| CN101748635A (en) * | 2010-03-18 | 2010-06-23 | 白雪刚 | Method for preparing slurry by replacement cooking |
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