CN1236138C - Improved lime mud recovering process and its application for producing neutral glue blending paper - Google Patents
Improved lime mud recovering process and its application for producing neutral glue blending paper Download PDFInfo
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- CN1236138C CN1236138C CN 200310105596 CN200310105596A CN1236138C CN 1236138 C CN1236138 C CN 1236138C CN 200310105596 CN200310105596 CN 200310105596 CN 200310105596 A CN200310105596 A CN 200310105596A CN 1236138 C CN1236138 C CN 1236138C
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- 238000000034 method Methods 0.000 title claims description 56
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 20
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- 125000002091 cationic group Chemical group 0.000 claims abstract description 16
- 239000008107 starch Substances 0.000 claims abstract description 16
- 235000019698 starch Nutrition 0.000 claims abstract description 16
- 238000011049 filling Methods 0.000 claims abstract description 15
- 235000013336 milk Nutrition 0.000 claims abstract description 9
- 239000008267 milk Substances 0.000 claims abstract description 9
- 210000004080 milk Anatomy 0.000 claims abstract description 9
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- 239000004927 clay Substances 0.000 claims description 156
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 238000004513 sizing Methods 0.000 claims description 43
- 238000005406 washing Methods 0.000 claims description 25
- 238000011084 recovery Methods 0.000 claims description 24
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- 239000002253 acid Substances 0.000 description 8
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- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 4
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
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Abstract
The present invention relates to improved technology for recovering white mud and the application of the technology in the production of neutral sized paper, which belongs to utilization of waste water, waste gas and waste slag. At the time of flocculation, the ratio of raw green liquor to lime milk is 30:1 to 1.2, and the raw green liquor and the lime milk are agitated at 90 to 100 DEG C for 20 to 40 min; at the time of auxiliary causticization, the ratio of white mud to clear green liquor is 5 to 8:1, residual alkali is washed at 90 to 100 DEG C, the ratio of the white mud to water is 1:8 to 10, and the white mud is ground until the grain diameter is less than or equal to 20 to 30 mu m. The fineness is from 20 to 30 mu m, the concentration is from 12 to 18 %w/w, the whiteness is from 80 to 95 %, the residual alkali content is less than or equal to 0.5 %, and the active CaO content is less than or equal to 0.5 %; the pH value is from 9 to 11, the deposition volume is from 3 to 10 ml/g within 10 min, and the dust degree is less than or equal to 0.5 mm2/g; the content of residues on a sieve with 325 meshes is less than or equal to 0.05 %. At the time of filling, absolute dried pulp: talcum powder: recovered white mud: cationic starch is equal to 1:0 to 0.2:0.15 to 0.4:0.015 to 0.02, and the AKD emulsion amount is from 15 to 18 kg/T.
Description
Technical field
The invention belongs to the recycling of the three wastes in the paper industry, be specifically related to improved white clay recovery method and the application in neutral sizing paper is produced thereof.
Background technology
It mainly is wood pulp that many national paper making raw materials are arranged in the world, and China's paper industry influences because of being subjected to resource, and paper making raw material is mainly based on the mixture of straw pulp, reed pulp, sugarcane slurry or above-mentioned all slurries and wood pulp.Because of being subjected to the influence of straw pulp class raw material, in its waste liquid alkali recovery process in the causticization white clay of by-product silicone content higher, the calcination method of inapplicable routine, and the chemical method, the WATER-WASHING METHOD that generally adopt in the industry, or be not suitable for national conditions because of cost is too high; Or do not reach the use standard of filler in the papermaking because of the calcium carbonate quality of by-product.
Recovery white clay method before improving is: the former green liquor that straw pulp method papermaking process comes out, in clarifier, leave standstill clarification naturally, and the cycle is long, weak effect; The lime of digestion is added in silicon, carbon and other colloidal state solid impurity that the green liquor storage tank causes green liquor to carry secretly, still exists, and continues descending, accumulation, is brought into the causticizing reaction system; White liquid after the causticization is difficult for clarification, and white clay is free settling, filtration and washing not, residual alkali number height in the white clay, and alkali loss is big.
Publication number CN 1084413C discloses a kind of " process for causticizing green solution of alkali recovered from black liquid of paper-making ", adopts the green liquor preliminary treatment, and superfluous lime according to it, obtains the soda bath and the precipitated calcium carbonate of recyclable utilization with twice causticization of green liquor; Its deficiency is: operation is loaded down with trivial details, and the precipitated calcium carbonate that reclaims of wood pulp method green liquor only, can reach the GB quality requirement; The precipitated calcium carbonate that straw pulp method green liquor reclaims does not reach the GB quality requirement.
Publication number CN 1349861A discloses a kind of " white clay recovering process ", and it is the improvement on existing " WATER-WASHING METHOD " basis, has kept logical CO
2Gas carries out the carbonating treatment process, has increased " grinding " operation, has improved whiteness and fineness; Once reclaim on probationly among a small circle, " calcium carbonate " particle quality of this kind recovery is more open, fineness and whiteness inequality, and in the printing process still often " dry linting ", be difficult to satisfy the printing demand, so fail to be applied to paper.
So " the causticization white clay " that present numerous paper pulp method papermaking enterprises produce remaining exceed standard discharging or landfill, contaminated environment not only also causes the significant wastage of resource.
Summary of the invention
The application's goal of the invention is suitable national conditions, with low cost of development, can be suitable for improved recovery white clay method and the application in neutral sizing paper is produced thereof in straw pulp method paper plant.
Technical scheme of the present invention is: develop a kind of recovery white clay method, it comprises green liquor clarification, digestion, causticization, sediment and matting, it is characterized in that former green liquor clarification operation increases flocculation step, clear green liquor is to white clay auxiliary air caustization step, white clay increase residual alkali of washing and grinding, regular step, wherein:
(1) in former green liquor, add milk of lime to its flocculation treatment, lime milk concentration 8～10%w/w,
Its weight proportion is: former green liquor: milk of lime=30: 1～1.2;
During flocculation treatment, 90～100 ℃ of temperature; Stir 20～40min; Treatment fluid leaves standstill, and separates the green mud slag and handles separately;
(2) separate the clear green liquor obtain to the white clay auxiliary air caustization in the sediment groove, white clay concentration 25～30%w/w,
Its weight proportion is: white clay: clear green liquor=5～8: 1; Under conventional the stirring, 90～100 ℃ of auxiliary air caustization temperature;
(3) with the residual alkali in the ordinary water washing white clay, the weight ratio of water consumption and white clay is: white clay: water=1: 8～10;
Behind the agitator treating, in the residual alkali content of NaOH reduce to≤0.5%;
(4) white clay after washing, through grind, neat and well spaced to particle diameter≤20～30 μ m, the concentration 12～18%w/w of white clay emulsion, standby.
The application of above-mentioned recovery white clay in neutral sizing paper is produced is characterized in that:
(1) the white clay specification of Ying Yonging: fineness 20～30 μ m; Concentration 12～18%w/w; Whiteness 80～95%; In the residual alkali content of NaOH≤0.5%; Active CaO content≤0.5%; PH9～11; 10 minutes settling volume 3～10ml/g; Dirt count≤0.5mm
2/ g; 325 screen residues≤0.05%; (annotate: sand mill-Xinghua, Shen, STM300B type Jiangyin construction machinery factory produces.)
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: talcum powder: reclaim white clay: cationic starch=1: 0.15～0.2: 0.15～0.2: 0.015～0.02
(3) or the weight proportion that adds when filling out in neutral sizing papermaking be:
Oven dry stock: reclaim white clay: cationic starch=1: 0.3～0.4: 0.015～0.02
(4) 10%AKD emulsion consumption is 15～18kg/T paper.
Annotate: AKD, Alkyl kelene dipolymer trade name alkyl ketene dimer, Jinan heavenly steed company produces.
The application's advantage is:
1. method is reasonable, implement to improve on the basis of former recovery method, and former green liquor clarification operation increases flocculation step, and clear green liquor is to white clay auxiliary air caustization step, and white clay increases the residual alkali of washing and grinding, regular step; Scrap build is easy, and fund input is few;
2. the recovery white clay after improving through on probation aborning, can replace the original industrial goods precipitated calcium carbonate that uses fully, uses in neutral sizing paper is produced, and produces high-quality neutral sizing paper;
3. twice laid reduces secondary pollution, not only increases economic benefit; Social benefit and obvious environment benefit.
Main be in the paper mill of raw material with the straw pulp fiber, will reclaim white clay and successfully be used for production and apply mechanically, the present invention be domestic first, of far-reaching significance.
Description of drawings
Fig. 1 is the white clay recovery method schematic flow sheet after the present invention improves;
Fig. 2 is the former white clay recovery method schematic flow sheet before improving;
Fig. 3 reclaims white clay to be applied to neutral sizing paper schematic flow sheet.
The specific embodiment
Below in conjunction with drawings and Examples, design of the present invention is further set forth:
In the former green liquor that papermaking alkali reclaims, remove and contain Na
2CO
3, outside useful alkali such as NaOH, silt and the imperfect combustion carbon granule, also contain Fe (OH)
3, Al (OH)
3, Mg (OH)
3, Fe
2O
3, FeS and silicon-containing compound isocolloid impurity, if they enter down step causticizing reaction system, not only can make white liquid (NaOH) be difficult for clarification, white clay is free settling, filtration and washing not, thereby influences the normal operation of causticization operation; And these impurity must be mingled in the white clay (CaCO that causticization produces
3) in, sneak into the back and be difficult to remove.
Among Fig. 2, demonstration be former white clay recovery method schematic flow sheet before improving.
The clear green liquor that the green liquor of former green liquor after green liquor clarifier natural subsidence → clarification enters accumulator tank → digester → causticizer → white liquor clarifier → 1# pre-hung filter → sediment groove → green mud groove natural subsidence enters 2# pre-hung filter and applies mechanically.The former green liquor that straw pulp method papermaking process comes out leaves standstill clarification naturally in clarifier, the cycle is long, weak effect; The lime of digestion is added in silicon, carbon and other colloidal state solid impurity that the green liquor storage tank causes green liquor to carry secretly, still exists, and continues descending, accumulation, is brought into the causticizing reaction system; White liquid after the causticization is difficult for clarification, and white clay is free settling, filtration and washing not, residual alkali number height in the white clay, and alkali loss is big.
Among Fig. 1, show the recovery white clay method flow schematic diagram after the present invention improves.
Increase " flocculation " step in the first step, former green liquor and flocculant enter green liquor clarifier synchronously, are discharged in green mud by " flocculation " through the colloidal state solid impurity that the former green liquor of " flocculation " step is carried secretly; The green liquor of clarification partly is used for preparation " flocculant ", after big subordinate's row adds milk of lime, through digester, causticizer, white liquor clarifier, tell strong white liquor (NaOH) after, enter 1 pre-on-hook; " white clay emulsion " after the filtration adds the clarification green liquor in the sediment groove, behind the white clay auxiliary air caustization in the sediment groove, through 2# pre-hung filter → white clay washer, with the residual alkali (wash water jacket) in the ordinary water washing white clay; White clay after washing is through grinding, neat and well spaced to particle diameter≤20～30 μ m, in storage tank for standby use.
The present invention makes former green liquor enter before the causticizing reaction in advance the thoroughly above-mentioned colloidal impurity of carrying secretly; Again through auxiliary air caustization, clean residual alkali; Respectively have the gap except that granularity, neat and well spaced degree, settling volume so enter the recovery white clay of " grinding, neat and well spaced " step, reached the requirement of papermaking filler qualitatively; Can be used for smoothly producing after " grinding, neat and well spaced ".
Among Fig. 3, " header box " that be presented at the paper pulp flow process located, and reclaims white clay and talcum powder, auxiliary agent and adds simultaneously, enters the schematic diagram of paper pulp flow process.
Through applicant's on probation confirmation in the neutral sizing paper of ten thousand tons of meters is produced, the recovery white clay of the inventive method can replace the precipitated calcium carbonate of commercial size fully.Contrast acid sized paper and neutral sizing paper (use talcum powder as filler and talcum powder to add merely reclaim white clay do the filler person), the measurement result of its contrast shows, the all more acid sized paper of the intensity of neutral sizing paper, opacity, ash is for well, mainly be the influence that does not have (acid sized paper interpolation) aluminum sulfate, paper fragility descends; Add talcum powder and add and reclaim the white clay person that does the filler, do not find harmful effect.
1 one kinds of improved recovery white clay methods of embodiment and the application in neutral sizing paper thereof
Promptly increase flocculation step in former green liquor clarification operation, clear green liquor is to white clay auxiliary air caustization step, and white clay increases the residual alkali of washing and grinding, regular step, wherein:
(1) in former green liquor, add milk of lime to its flocculation treatment, lime milk concentration 8～10%w/w,
Its weight proportion is: former green liquor: milk of lime=30: 1;
During flocculation treatment, 90～100 ℃ of temperature; Stir 20～40min; Treatment fluid leaves standstill, and separates the green mud slag and handles separately;
(2) separate the clear green liquor obtain to the white clay auxiliary air caustization in the sediment groove, white clay concentration 30%w/w,
Its weight proportion is: white clay: clear green liquor=8: 1; Under conventional the stirring, 90～100 ℃ of auxiliary air caustization temperature;
(3) with the residual alkali in the ordinary water washing white clay, the weight ratio of water consumption and white clay is: white clay: water=1: 10;
Behind the agitator treating, in the residual alkali content of NaOH reduce to≤0.5%;
(4) white clay after washing, through grind, neat and well spaced to particle diameter≤20～30 μ m, the concentration 18%w/w of white clay emulsion, standby.
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging: fineness 20～30 μ m (Ma Erwen particle diameter instrument is measured, and its fineness roughly is equivalent to 500 orders); Concentration 10～20%w/w; Whiteness 95%; In the residual alkali content 0.4% of NaOH; Active CaO content 0.35%; PH 9～11; 10 minutes settling volume 10ml/g; Dirt count 0.5mm
2/ g; 325 screen residues 0.05%;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: talcum powder: reclaim white clay: cationic starch=1: 0.2: 0.2: 0.2
(3) 10%AKD emulsion consumption is a 18kg/T paper.
Applicating example:
When joining slurry, conventional brightening agent, reddish blue amount routinely add in the straw pulp raw material, after the circulation evenly, add the cationic starch that is equivalent to oven dry stock total amount 0.2;
Adjust AKD (Alkyl kelene dipolymer trade name alkyl ketene dimer, Jinan heavenly steed company produces) consumption, press 360ml/min and add, total consumption is adjusted to 18kg/T paper, and AKD adds point and is header box; In slurry, add filler gradually, use earlier the talcum powder as filler, conventional detection " table is inhaled ", after treating that " table is inhaled " is stable, add the white clay that is equivalent to oven dry stock total amount 0.2, observe paper machine ruuning situation, whether in time measure online pH value and Zeta potential in prescribed limit.
After treating that the paper machine paper delivery is normal, get pattern, method in accordance with regulations behind 115 ℃ of baking 15min detects the paper physical index,
Contrast acid sized paper, use talcum powder as filler and talcum powder to add the measurement result that the recovery white clay is done the filler three merely:
Acid sized paper neutral sizing paper (talcum powder as filler) neutral sizing paper (talcum powder adds the recovery white clay and makes filler)
Opacity, % 81 83.33 84.48
Average table is inhaled g/m
227～40 30～40 30～40
Ash, % 21.30 23 26.35
Tensile index, Nm/g 29.1 36.4 38.8 (vertically)
25.5 29.1 30.7 (laterally)
From above data analysis, all more acid sized paper of the intensity of neutral sizing paper, opacity, ash mainly is the influence that does not have (acid sized paper interpolation) aluminum sulfate for well, and paper fragility descends; Add talcum powder and add and reclaim the white clay person that does the filler, do not find harmful effect.Paper paper money is made process and is also embodied following advantage:
1. system cleans, and head box, header box, mixing pit do not have foam, and no paper scrap glues cylinder; Drying effect is better than acid sized paper, reduces with the Isoquant steam consumption.
2. need not to add gum rosin, aluminum sulfate, easy and simple to handle, method is easily grasped.
3. online interpolation neutral sizing agent, sizing efficiency are convenient to adjust, and it is more stable that the surface absorbs weight.
Neutrality is copied paper (add the recovery white clay and make filler) and is copied paper relatively with the acidity before improving, cost decline, and quality improves
1. reduce and recovery use " white clay " 11 yuan/T of cost decline paper because of the filler additive kind.
Annotate: the filler cost
Acidity is copied paper neutrality and is copied paper
Filler unit consumption price filler unit consumption price
0.15 42 yuan of 0.3 54 yuan of talcum powder of talcum powder+recovery white clay
0.024 72 yuan of 0.2 20 yuan of AKD of aluminum sulfate
0.00255 51 yuan of gum rosins (10% content)
Add up to 114 yuan/T of 125 yuan/T paper paper
With the our unit is example, produces 180000 tons on cultural paper per year, uses and reclaims white clay in production, can reduce cost nearly 2,000,000 yuan/year.
2. paper quality improves, and neutral sizing paper is brightness reversion not, the intensity height, and the opacity height, and it is poor with minimizing vision two sides effectively to reduce aberration.
Main be in the paper mill of raw material with the straw pulp fiber, will reclaim white clay and successfully be used for production and apply mechanically, the present invention be domestic first, of far-reaching significance.
The present invention realizes twice laid, reduces secondary pollution, economic benefit, social benefit and obvious environment benefit.
Embodiment 2
Reclaim the white clay method
(1) in former green liquor, add milk of lime to its flocculation treatment, lime milk concentration 8～10%w/w,
Its weight proportion is: former green liquor: milk of lime=30: 1.2;
During flocculation treatment, 90～100 ℃ of temperature; Stir 20～40min; Treatment fluid leaves standstill, and separates the green mud slag and handles separately;
(2) separate the clear green liquor obtain to the white clay auxiliary air caustization in the sediment groove, white clay concentration 25%w/w,
Its weight proportion is: white clay: clear green liquor=5: 1; Under conventional the stirring, 90～100 ℃ of auxiliary air caustization temperature;
(3) with the residual alkali in the ordinary water washing white clay, the weight ratio of water consumption and white clay is: white clay: water=1: 8;
Behind the agitator treating, in the residual alkali content of NaOH reduce to≤0.5%;
(4) white clay after washing, through grind, neat and well spaced to particle diameter≤20～30 μ m, the concentration 12%w/w of white clay emulsion, standby.
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging: fineness 20～30 μ m (Ma Erwen particle diameter instrument is measured, and its fineness roughly is equivalent to 500 orders); Concentration 10～20%w/w; Whiteness 80%; In the residual alkali content 0.45% of NaOH; Active CaO content 0.35%; PH 9～11; 10 minutes settling volume 3ml/g; Dirt count 0.25mm
2/ g; 325 screen residues 0.045%;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: talcum powder: reclaim white clay: cationic starch=1: 0.15: 0.15: 0.15
(3) 10%AKD emulsion consumption is a 15kg/T paper.All the other are with embodiment 1.
Embodiment 3
Reclaim the white clay method
(1) in former green liquor, add milk of lime to its flocculation treatment, lime milk concentration 8～10%w/w,
Its weight proportion is: former green liquor: milk of lime=30: 1.1;
During flocculation treatment, 90～100 ℃ of temperature; Stir 30min; Treatment fluid leaves standstill, and separates the green mud slag and handles separately;
(2) separate the clear green liquor obtain to the white clay auxiliary air caustization in the sediment groove, white clay concentration 28%w/w,
Its weight proportion is: white clay: clear green liquor=6: 1; Under conventional the stirring, 90～100 ℃ of auxiliary air caustization temperature;
(3) with the residual alkali in the ordinary water washing white clay, the weight ratio of water consumption and white clay is: white clay: water=1: 9;
Behind the agitator treating, in the residual alkali content of NaOH reduce to≤0.5%;
(4) white clay after washing, through grind, neat and well spaced to particle diameter≤20～30 μ m, the concentration 15%w/w of white clay emulsion, standby.
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging: fineness 20～30 μ m (Ma Erwen particle diameter instrument is measured, and its fineness roughly is equivalent to 500 orders); Concentration 10～20%w/w whiteness 85%; In the residual alkali content 0.45% of NaOH; Active CaO content 0.5%; PH9～11; 10 minutes settling volume 5ml/g; Dirt count 0.35mm
2/ g; 325 screen residues 0.05%;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: talcum powder: reclaim white clay: cationic starch=1: 0.16: 0.16: 0.16
(3) 10%AKD emulsion consumption is a 16kg/T paper.All the other are with embodiment 1.
Embodiment 4
Reclaim the white clay method
(1) in former green liquor, add milk of lime to its flocculation treatment, lime milk concentration 8～10%w/w,
Its weight proportion is: former green liquor: milk of lime=30: 1.05;
During flocculation treatment, 90～100 ℃ of temperature; Stir 20～40min; Treatment fluid leaves standstill, and separates the green mud slag and handles separately;
(2) separate the clear green liquor obtain to the white clay auxiliary air caustization in the sediment groove, white clay concentration 29.5%w/w,
Its weight proportion is: white clay: clear green liquor=7.5: 1; Under conventional the stirring, 90～100 ℃ of auxiliary air caustization temperature;
(3) with the residual alkali in the ordinary water washing white clay, the weight ratio of water consumption and white clay is: white clay: water=1: 8.5;
Behind the agitator treating, in the residual alkali content of NaOH reduce to≤0.5%;
(4) white clay after washing, through grind, neat and well spaced to particle diameter≤20～30 μ m, the concentration 13.5%w/w of white clay emulsion, standby.
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging: fineness 20～30 μ m (Ma Erwen particle diameter instrument is measured, and its fineness roughly is equivalent to 500 orders); Concentration 10～20w/w; Whiteness 88%; In the residual alkali content 0.47% of NaOH; Active CaO content 0.47%; PH9～11; 10 minutes settling volume 4ml/g; Dirt count 0.37mm
2/ g; 325 screen residues 0.038%;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: talcum powder: reclaim white clay: cationic starch=1: 0.19: 0.19: 0.19
(3) 10%AKD emulsion consumption is a 17.5kg/T paper.All the other are with embodiment 1.
Embodiment 5
Reclaim the white clay method
(1) in former green liquor, add milk of lime to its flocculation treatment, lime milk concentration 8～10%w/w,
Its weight proportion is: former green liquor: milk of lime=30: 1.05;
During flocculation treatment, 90～100 ℃ of temperature; Stir 35min; Treatment fluid leaves standstill, and separates the green mud slag and handles separately;
(2) separate the clear green liquor obtain to the white clay auxiliary air caustization in the sediment groove, white clay concentration 26.5%w/w,
Its weight proportion is: white clay: clear green liquor=7: 1; Under conventional the stirring, 90～100 ℃ of auxiliary air caustization temperature;
(3) with the residual alkali in the ordinary water washing white clay, the weight ratio of water consumption and white clay is: white clay: water=1: 8.5;
Behind the agitator treating, in the residual alkali content of NaOH reduce to≤0.5%;
(4) white clay after washing, through grind, neat and well spaced to particle diameter≤20～30 μ m, the concentration 12～18%w/w of white clay emulsion, standby.
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging: fineness 20～30 μ m (Ma Erwen particle diameter instrument is measured, and its fineness roughly is equivalent to 500 orders); Concentration 10～20%w/w; Whiteness 93%; In the residual alkali content 0.39% of NaOH; Active CaO content 0.37%; PH 9～11; 10 minutes settling volume 8.5ml/g; Dirt count 0.49mm
2/ g; 325 screen residues 0.032%;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: talcum powder: reclaim white clay: cationic starch=1: 0.17: 0.2: 0.18
(3) 10%AKD emulsion consumption is a 17kg/T paper.All the other are with embodiment 1.
Embodiment 6
Reclaim the white clay method with example 1;
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging is with example 1
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: reclaim white clay: cationic starch=1: 0.3: 0.015
(3) 10%AKD emulsion consumption is a 15kg/T paper.All the other are with embodiment 1.
Embodiment 7
Reclaim the white clay method with example 2;
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging is with example 2;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: reclaim white clay: cationic starch=1: 0.4: 0.02
(3) 10%AKD emulsion consumption is a 16kg/T paper.All the other are with embodiment 2.
Embodiment 8
Reclaim the white clay method with example 3;
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging is with example 3;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: reclaim white clay: cationic starch=1: 0.35: 0.018;
(3) 10%AKD emulsion consumption is a 17.5kg/T paper.All the other are with embodiment 3.
Embodiment 9
Reclaim the white clay method with example 4;
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging is with example 4;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: reclaim white clay: cationic starch=1: 0.38: 0.019;
(3) 10%AKD emulsion consumption is a 17kg/T paper.All the other are with embodiment 4.
Embodiment 10
Reclaim the white clay method with example 5;
The white clay that said method reclaims is used in neutral sizing paper is produced:
(1) the white clay specification of Ying Yonging is with example 5;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: reclaim white clay: cationic starch=1: 0.33: 0.016;
(3) 10%AKD emulsion consumption is a 17kg/T paper.All the other are with embodiment 5.
Claims (3)
1. one kind is reclaimed the white clay method, it comprises green liquor clarification, digestion, causticization, sediment and matting, it is characterized in that former green liquor clarification operation increases flocculation step, and clear green liquor is to white clay auxiliary air caustization step, white clay increase residual alkali of washing and grinding, regular step, wherein:
(1) in former green liquor, add milk of lime to its flocculation treatment, lime milk concentration 8～10%w/w,
Its weight proportion is: former green liquor: milk of lime=30: 1～1.2;
During flocculation treatment, 90～100 ℃ of temperature; Stir 20～40min; Treatment fluid leaves standstill, and separates the green mud slag and handles separately;
(2) separate the clear green liquor obtain to the white clay auxiliary air caustization in the sediment groove, white clay concentration 25～30%w/w,
Its weight proportion is: white clay: clear green liquor=5～8: 1; Under conventional the stirring, 90～100 ℃ of auxiliary air caustization temperature;
(3) with the residual alkali in the ordinary water washing white clay, the weight ratio of water consumption and white clay is: white clay: water=1: 8～10;
Behind the agitator treating, in the residual alkali content of NaOH reduce to≤0.5%;
(4) white clay after washing, through grind, neat and well spaced to particle diameter be 20～30 μ m, the concentration 12～18%w/w of white clay emulsion, standby.
2. the application of the white clay that method reclaimed in neutral sizing paper is produced according to the described recovery white clay of claim 1 is characterized in that:
(1) the white clay specification of Ying Yonging: fineness 20～30 μ m; Concentration 12～18%w/w; Whiteness 80～95%; In the residual alkali content of NaOH≤0.5%; Active CaO content≤0.5%; PH 9～11; 10 minutes settling volume 3～10ml/g; Dirt count≤0.5mm
2/ g; 325 screen residues≤0.05%;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: talcum powder: reclaim white clay: cationic starch=1: 0.15～0.2: 0.15～0.2: 0.015～0.02
(3) 10% alkyl ketene dimer emulsion consumptions are 15～18kg/T paper.
3. one kind according to the application of the described recovery white clay of claim 1 in neutral sizing paper is produced, and it is characterized in that:
(1) the white clay specification of Ying Yonging: fineness 20～30 μ m; Concentration 12～18%w/w; Whiteness 80～95%; In the residual alkali content of NaOH≤0.5%; Active CaO content≤0.5%; PH 9～11; 10 minutes settling volume 3～10ml/g; Dirt count≤0.5mm
2/ g; 325 screen residues≤0.05%;
(2) weight proportion that adds when filling out in neutral sizing papermaking is:
Oven dry stock: reclaim white clay: cationic starch=1: 0.3～0.4: 0.015～0.02
(3) 10% alkyl ketene dimer emulsion consumptions are 15～18kg/T paper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200310105596 CN1236138C (en) | 2003-12-12 | 2003-12-12 | Improved lime mud recovering process and its application for producing neutral glue blending paper |
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| CN 200310105596 CN1236138C (en) | 2003-12-12 | 2003-12-12 | Improved lime mud recovering process and its application for producing neutral glue blending paper |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100427678C (en) * | 2006-12-26 | 2008-10-22 | 上海东升新材料有限公司 | Purifying treating process of paper making green liquid and application of abtained white mud |
| CN101955370B (en) * | 2010-04-20 | 2012-09-12 | 南京理工大学 | Lightweight heat insulating ceramic material and preparation method |
| CN103180506A (en) * | 2011-09-19 | 2013-06-26 | 北京沃特玛德环境技术股份有限公司 | Method for comprehensively utilizing solid waste during soda recovery in papermaking industry |
| CN102493277B (en) * | 2011-12-08 | 2014-08-13 | 山东轻工业学院 | Alkenyl succinic anhydride sizing agent emulsion and preparation method thereof |
| CN104213462B (en) * | 2014-08-29 | 2017-01-11 | 华南理工大学 | Application method of white clay in papermaking filling |
| CN109650433B (en) * | 2019-02-13 | 2019-12-03 | 广东鼎丰纸业有限公司 | The method of slurrying alkali collection green liquor purification manufacture high-purity calcium carbonate |
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