CN103046426A - Pulping method of semi-chemical pulp made from reed - Google Patents
Pulping method of semi-chemical pulp made from reed Download PDFInfo
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- CN103046426A CN103046426A CN2013100116130A CN201310011613A CN103046426A CN 103046426 A CN103046426 A CN 103046426A CN 2013100116130 A CN2013100116130 A CN 2013100116130A CN 201310011613 A CN201310011613 A CN 201310011613A CN 103046426 A CN103046426 A CN 103046426A
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Abstract
The invention discloses a pulping method of semi-chemical pulp made from reed. The pulping method comprises the steps of: preparing for the raw material, cooking, shoving by using a screw, pulp-grinding at a normal pressure, washing and screening. The pulping method is characterized by comprising the following steps: 1, the raw material is prepared by adopting a dry and wet process, to be specific, the reed with a length of 20-40mm and the percent of pass being more than 80 percent is provided; 2, cooking is carried out by adopting a caustic soda process, wherein the alkali charge is 5-10 percent by weight in the terms of NaOH, the liquid ratio is 1:(2.5-3.5) and the H factor is 500-1200, the yield of the pulp obtained by cooking is 60-80 percent and the Kappa value of the pulp is 50-100; 3, the pulp feeding concentration of a screw shoving machine is 8-12 percent, the pulp discharging concentration of the screw shoving machine is 20-40 percent; 4, the normal pressure pulp grinding concentration of one section is 10-40 percent, and the pulp beating degree is 20-30 DEG SR; and 5, the ring crush compression resistance of the reed semi-chemical pulp is good, the ring crush index is not less than 8.0N.m/g, and the fracture length of the pulp is not less than 4.5km. The pulping method is high in yield, and realizes effective utilization of the reed resources; and the produced reed semi-chemical pulp has high quality and can be used for producing high-grade fluting mediums and case boards.
Description
Technical field
The present invention relates to a kind of pulping process of the semi-chemical pulp take reed as raw material, belong to the Pulp and Paper Engineering technical field.
Background technology
Take string as raw material, the paper pulp through different processing methods makes can be divided into mechanical pulp, change machine slurry, chemical pulp and semi-chemical pulp according to processing method.Semi-chemical pulp refers to process pulping raw material and the mechanical paper pulp that combines and make from two kinds of methods of solution defibre by chemicals.About 50% lignin, the hemicellulose of 30%-50% are removed in the raw material in chemical treatment usually, and paper pulp yield is usually at 60%-80%.Pulp properties is between chemical pulp and change machine slurry, mainly for the production of wrapping paper, cardboard etc.
Mainly produce semi-chemical pulp abroad take leaf wood as raw material, the slurry quality that the assortment that density is large is produced is not good, birch, poplar, Eucalyptus are raw materials preferably in the broadleaf, useful pine and China fir yet.Domestic raw material is more assorted, mainly contains weedtree, pine, bamboo, cotton stalk, non-wood material.
China is maximum in the world straw pulp big producing country, and approximately 1,200 ten thousand ton/years of present domestic straw pulp output are mainly take chemical pulp as main.Over nearly 10 years, rapid growth along with China's packing board demand, packing board is short with slurry, domestic OCC waste paper can not satisfy the quality requirement of producing high-grade packing board well simultaneously, therefore in Shandong, the ground such as Henan, Hebei, Inner Mongol some semi-chemical pulp production lines of in succession having gone into operation, be raw material production boxboard and fluting medium with mixing leaf wood, pine, cotton stalk, wheat straw etc.Document 1 reed half chemical pulping trial production--" Chinese papermaking " 06 phase in 1976, document 2 reeds half chemical pulping trial production-" paper technology communication " 06 phase in 1976, reported the slurrying trial production of reed semi-chemical pulp, the boiling alkali charge that adopts in the document is high, temperature is high, the time is long, paper pulp yield is low, hardness is low, for the production of cultural paper.
Summary of the invention
The pulping process that the purpose of this invention is to provide a kind of semi-chemical pulp take reed as raw material.The method pulping yield is high, has realized the reed efficient utilization of resource.The reed semi-chemical pulp quality that the method is produced is better, can be for the production of high-grade fluting medium and boxboard.
The technical solution used in the present invention: comprise get the raw materials ready, boiling, screw rod shove, normal pressure defibrination, washing, screening, it is characterized in that:
(1) gets the raw materials ready: reed is evenly cut off, remove the lightweight dust through cyclone separator, screen out again the fine impurities such as part silt, reed marrow through rotary strainer, remove reed leaf, reed film etc. finally by the louver dust removal machine, length 20-40mm is provided, qualification rate at the reed sheet more than 80% through the laggard boiling of the further removal of impurities of water washing;
(2) boiling: adopt soda processes, conditions of cooking is as follows: alkali charge is by NaOH 5-10% percentage by weight, liquor ratio 1:2.5～3.5, the H factor 500～1200, boiling gained paper pulp yield 60-80%, Kappa value 50-100;
(3) concentration of advancing to starch of screw rod press master is 8～12%, pulp concentration 20～40%;
(4) one sections normal pressure refining concentration 10-40%, 20-30 ° of SR of slurry beating degree;
Under above-mentioned slurrying condition, the ring crush intensity of reed semi-chemical pulp is better, ring crush index 〉=8.0 N.m/g; Fracture length 〉=the 4.5km of paper pulp can satisfy high-class product quality requirement among " fluting medium " (GB/T 13023-2008).
The H factor=∫ K among the present invention
RDt, in the formula, K
RExpression reed soda cooking relative temperature is 50 ℃ under different temperatures the time speed constant, chronomere is hour.
The inventive method main feature is to adopt boiling between the low-temperature short-time of H factor control, screw extruding, high dense mill.From the reed sheet of spraying pot not pulping out, adopt screw extruding: the one, make the reed sheet crumple into fibre bundle, improve defibrination; The 2nd, extract black liquor, concentration and the temperature of sending alkali to reclaim black liquor are improved, 1. improve the black liquor Baume, can reduce the water yield in the black liquor, save the steam consumption of evaporation, extract the black liquor Baume and bring up to 9.5Be from 6.5 original Be.2. improve the energy-saving effect of black liquor temperature, cold spurting makes in the steam pipe slurry temperature be reduced to 100-110 ℃ from 150～160 ℃ to advance spraying pot again, this process black liquor has absorbed the overwhelming majority and has put a pot waste heat, spurt the process dispersed heat than between steam little, if allow this part heat no longer again run off, energy-saving effect is appreciable.The heat balance estimation, this part heat flow accounts for about 78% of total amount of heat, and slurry (the comprising black liquor) temperature in the pot is about 100 ℃.For the heat in the black liquor is no longer run off, adopt single-screw press master high consistency extraction technology, directly sending the alkali recovery here from the hot concentrated black liquid of extruding, thereby really realize the cold energy-conservation purpose of spurting.The temperature of sending alkali to reclaim black liquor from single-screw extrusion machine can reach 90 ℃, and is higher more than 20 ℃ than the black liquor temperature of sending from vacuum pulp washing machine; The 3rd, in order to improve the effect of lower road pulp washing operation, improving yield and detersive efficiency reduce residual alkali, improve extraction rate of black liquor, reduce the load of sewage disposal system.
The inventive method pulping yield is high, has realized the reed efficient utilization of resource, and the reed semi-chemical pulp quality of production is better, can be for the production of high-grade fluting medium and boxboard.
The specific embodiment
The present invention will be further described below in conjunction with embodiment, it should be understood that these embodiment only are used for the purpose of illustration, never limit protection scope of the present invention.
Embodiment 1:
(1) gets the raw materials ready: reed is evenly cut off, remove the lightweight dust through cyclone separator, screen out again the fine impurities such as part silt, reed marrow through rotary strainer, after removing reed leaf, reed film finally by the louver dust removal machine, reed leaf length 20-40mm, qualification rate 85% adopts the dirty hot water of alkali recovery and partly washing the reed water circulation retrieves to wash the reed sheet, and the reed sheet advances boiling again;
(2) take alkali number by NaOH 5%, the H factor 550, under the condition of liquor ratio 1:2.5, water and cooker all are heated to 50 ℃ in advance in liquid, the pot, carry out boiling by following boiling curve:
30min 20min
50℃------------→120℃--------------→120℃
With this understanding boiling, gained paper pulp yield 72.6%, Kappa value 91.2;
(3) concentration of advancing to starch of screw rod press master is 10%, pulp concentration 30%;
(4) one sections normal pressure refining concentrations 30%, 26 ° of SR of slurry beating degree;
(5) under above-mentioned optimization slurrying condition, the ring crush intensity of reed semi-chemical pulp is better, ring crush index 8.2 N.m/g, the AAA level quality requirement of high-class product among satisfied " fluting medium " (GB/T 13023-2008); The A level quality requirement of high-class product among the fracture length 4.7km " fluting medium " (GB/T 13023-2008) of paper pulp.
Embodiment 2:
(1) gets the raw materials ready: reed is evenly cut off, remove the lightweight dust through cyclone separator, screen out again the fine impurities such as part silt, reed marrow through rotary strainer, after removing reed leaf, reed film finally by the louver dust removal machine, reed leaf length 20-40mm, qualification rate 86% adopts the dirty hot water of alkali recovery and partly washing the reed water circulation retrieves to wash the reed sheet, and the reed sheet advances boiling again;
(2) take alkali number by NaOH 7.5%, the H factor 850, under the condition of liquor ratio 1:3.2, water and cooker all are heated to 50 ℃ in advance in liquid, the pot, carry out boiling by following boiling curve:
12min 39min
50℃------------→110℃--------------→110℃
With this understanding boiling, gained paper pulp yield 67.9%, Kappa value 61.4;
(3) concentration of advancing to starch of screw rod press master is 11%, pulp concentration 35%;
(4) one sections normal pressure refining concentrations 30%, 28 ° of SR of slurry beating degree;
(5) under above-mentioned optimization slurrying condition, the ring crush intensity of reed semi-chemical pulp is better, ring crush index 8.5N.m/g, the AAA level quality requirement of high-class product among satisfied " fluting medium " (GB/T 13023-2008); The A level quality requirement of high-class product among the fracture length 4.7km " fluting medium " (GB/T 13023-2008) of paper pulp.
Embodiment 3:
(1) gets the raw materials ready: reed is evenly cut off, remove the lightweight dust through cyclone separator, screen out again the fine impurities such as part silt, reed marrow through rotary strainer, after removing reed leaf, reed film finally by the louver dust removal machine, reed leaf length 20-40mm, qualification rate 80% adopts the dirty hot water of alkali recovery and partly washing the reed water circulation retrieves to wash the reed sheet, and the reed sheet advances boiling again;
(2) take alkali number by NaOH 10%, CFH 100, under the condition of liquor ratio 1:3.5, water and cooker all are heated to 50 ℃ in advance in liquid, the pot, carry out boiling by following boiling curve:
8min 68min
50℃------------→120℃--------------→120℃
With this understanding boiling, gained paper pulp yield 61.2%, Kappa value 53.1;
(3) concentration of advancing to starch of screw rod press master is 10%, pulp concentration 32%;
(4) one sections normal pressure refining concentrations 32%, 25 ° of SR of slurry beating degree;
(5) under above-mentioned optimization slurrying condition, the ring crush intensity of reed semi-chemical pulp is better, ring crush index 8.9N.m/g, the AAA level quality requirement of high-class product among satisfied " fluting medium " (GB/T 13023-2008); The A level quality requirement of high-class product among the fracture length 4.8km " fluting medium " (GB/T 13023-2008) of paper pulp.
Claims (1)
1. the pulping process of the semi-chemical pulp take reed as raw material, include get the raw materials ready, boiling, screw rod shove, normal pressure defibrination, washing, screening, it is characterized in that:
(1) gets the raw materials ready: reed is evenly cut off, remove the lightweight dust through cyclone separator, screen out again the fine impurities such as part silt, reed marrow through rotary strainer, remove reed leaf, reed film etc. finally by the louver dust removal machine, length 20-40mm is provided, qualification rate at the reed sheet more than 80% through the laggard boiling of the further removal of impurities of water washing;
(2) boiling: adopt soda processes, conditions of cooking is as follows: alkali charge is by NaOH 5-10% percentage by weight, liquor ratio 1:2.5～3.5, the H factor 500～1200, boiling gained paper pulp yield 60-80%, Kappa value 50-100;
(3) concentration of advancing to starch of screw rod press master is 8～12%, pulp concentration 20～40%;
(4) one sections normal pressure refining concentration 10-40%, 20-30 ° of SR of slurry beating degree;
(5) under above-mentioned optimization slurrying condition, the ring crush intensity of pulping reed semi-chemical pulp is better, ring crush index 〉=8.0 N.m/g; Fracture length 〉=the 4.5km of paper pulp.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104690066A (en) * | 2015-02-06 | 2015-06-10 | 福建农林大学 | Comprehensive utilization method of energy grass |
| CN104711885A (en) * | 2015-02-12 | 2015-06-17 | 新疆国力源环保科技有限公司 | Caragana intermedia natural-color semi-chemical mechanical pulping process |
| CN112411239A (en) * | 2020-04-29 | 2021-02-26 | 新疆洁康达纸业有限公司 | Alkaline natural color reed pulp and production method of paper for daily use thereof |
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| US20050051287A1 (en) * | 2003-09-08 | 2005-03-10 | Wade Chute | Chemimechanical desilication of nonwood plant materials |
| CN2765930Y (en) * | 2004-11-27 | 2006-03-22 | 雷金丰 | Pulp making apparatus of non-boiling , spiral chute type biochemical dissolvant continuous immersion and catalyzed cracking |
| CN101694075A (en) * | 2009-10-16 | 2010-04-14 | 林宣禧 | Low energy consumption clean paper pulp extracting method and papermaking process thereof |
| CN102517971A (en) * | 2011-12-19 | 2012-06-27 | 中冶美利纸业股份有限公司 | Preparation method for mixed pulp of wheat straw and reed |
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- 2013-01-14 CN CN2013100116130A patent/CN103046426A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050051287A1 (en) * | 2003-09-08 | 2005-03-10 | Wade Chute | Chemimechanical desilication of nonwood plant materials |
| CN2765930Y (en) * | 2004-11-27 | 2006-03-22 | 雷金丰 | Pulp making apparatus of non-boiling , spiral chute type biochemical dissolvant continuous immersion and catalyzed cracking |
| CN101694075A (en) * | 2009-10-16 | 2010-04-14 | 林宣禧 | Low energy consumption clean paper pulp extracting method and papermaking process thereof |
| CN102517971A (en) * | 2011-12-19 | 2012-06-27 | 中冶美利纸业股份有限公司 | Preparation method for mixed pulp of wheat straw and reed |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104690066A (en) * | 2015-02-06 | 2015-06-10 | 福建农林大学 | Comprehensive utilization method of energy grass |
| CN104690066B (en) * | 2015-02-06 | 2016-09-07 | 福建农林大学 | A kind of method of comprehensive utilization of energy grass |
| CN104711885A (en) * | 2015-02-12 | 2015-06-17 | 新疆国力源环保科技有限公司 | Caragana intermedia natural-color semi-chemical mechanical pulping process |
| CN112411239A (en) * | 2020-04-29 | 2021-02-26 | 新疆洁康达纸业有限公司 | Alkaline natural color reed pulp and production method of paper for daily use thereof |
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Application publication date: 20130417 |