CN102852031B - Modified calcium sulfate crystal whisker papermaking filler, preparation method and applications thereof - Google Patents
Modified calcium sulfate crystal whisker papermaking filler, preparation method and applications thereof Download PDFInfo
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Abstract
本发明公开了一种改性硫酸钙晶须造纸填料及其制备方法和应用，（1）首先制备改性硫酸钙晶须造纸填料；（2）然后将该改性硫酸钙晶须造纸填料应用于造纸工业：1）抄纸浆料选择；（2）改性硫酸钙晶须造纸填料及其相关辅料的使用；3）纸页抄造；4）白水循环。本发明使用的硫酸钙晶须原料来源广、条件宽，能够有效解决固废污染；改性硫酸钙晶须产品白度高、磨耗低，溶解性得到有效控制，抄纸留住率高，白水负荷低，消除了管道结垢问题，完全能够替代碳酸钙、瓷土、滑石粉等造纸填料及部分植物纤维原料。本发明设备投资少，改性工艺简单、可操作性强，成本低，易于大规模生产应用。The invention discloses a modified calcium sulfate whisker paper-making filler and its preparation method and application. (1) first prepare the modified calcium sulfate whisker paper-making filler; (2) then apply the modified calcium sulfate whisker paper-making filler In the paper industry: 1) selection of pulp for papermaking; (2) use of modified calcium sulfate whisker paper filler and related auxiliary materials; 3) paper sheet making; 4) white water circulation. The calcium sulfate whisker used in the present invention has a wide source of raw materials and wide conditions, and can effectively solve solid waste pollution; the modified calcium sulfate whisker product has high whiteness, low wear, effective control of solubility, high papermaking retention rate, and white water The load is low, eliminating the problem of pipe scaling, and can completely replace calcium carbonate, china clay, talcum powder and other paper-making fillers and some plant fiber raw materials. The invention has low equipment investment, simple modification process, strong operability, low cost and easy large-scale production and application.
Description
Technical field
The present invention relates to a kind of modified calcium sulfate crystal whisker papermaking filler and its preparation method and application, belong to pulp technology for making paper.
Background technology
Paper industry in order to reduce string consumption and paper production cost, is improved page characteristic in producing, and conventionally in paper pulp, adds a certain proportion of white mineral filler, mainly comprises the natural mineral raws such as calcium carbonate, china clay, talcum powder.Adopt the mineral matters such as these non-renewable calcium carbonate, china clay, talcum powder to add for papermaking and fill out, not only will consume a large amount of natural mineral resources, and brought serious destruction to mining area vegetation and natural environment.Calcium sulfate crystal whiskers (claims again crystal whisker of gypsum, gypsum fiber), a kind of accessory substance extracting from desulfurated plaster, ardealite, metal smelt waste residue or wet method phosphate rock-sulfuric acid process, it have purity high, wear away many good physicochemical properties such as low, high temperature resistant, acid and alkali-resistance, dimensionally stable; And its raw materials source is sufficient, low production cost.If can utilize this resourceful calcium sulfate crystal whiskers extracting from waste residue as papermaking filler; replace or partly replace mineral filler and the plant fiber materials such as non-renewable calcium carbonate; for the natural mineral resources of protection, save string, effectively solve solid slag and pollute all tools and be of great significance.
Calcium sulfate crystal whiskers has the key property of the papermaking fillers such as purity is high, whiteness is high, it is low to wear away, acid and alkali-resistance, but studies have shown that in a large number, and hydration reaction very easily occurs after contacting with water calcium sulfate crystal whiskers, causes its crystal structure and performance to be destroyed, and loses the characteristic of whisker; While directly application as papermaking filler, calcium sulfate crystal whiskers is very low at the retention of web part of paper machine, and because its dissolubility is higher, in paper machine white water system, can produce a large amount of calcium ions and sulfate ion, cause the series of problems such as the increase of wet end of machine chemicals usage, the reduction of paper machine behavior in service.Document 1(Chen Xue imperial or royal seal Cui Bo Yin enters China, the application of ardealite whisker in papermaking, Heilungkiang papermaking, 2007(2): 4-5), the little roc in document 2(Li Hong chief Li Xinping Wang Hui qin high mountain, the Primary Study that gypsum microfiber strengthens for paper, China's papermaking, 2005(2): 23-25), document 3(Yan Liu is in steel, the research of gypsum fiber to paper humidification, China's paper industry, 2009(18): 63-65), what North Sea of document 4(Liao Xia woods Qian Xueren, the dissolution inhibition modification of crystal whisker of gypsum and the application in papermaking, Paper Science & Technology, 2009(6): 82-86) etc. report that calcium sulfate crystal whiskers adds the research of filling out for papermaking, also the retention that has confirmed the existence of calcium sulfate crystal whiskers direct loading is low, the problems such as plain boiled water load is high, in report, also attempt to adopt chitin modified, strengthening the measure raising calcium sulfate crystal whiskers such as retention agent consumption keeps, but result is unsatisfactory, and modified technique complexity, cost costliness, cannot be applied to extensive paper industryization and produce.Therefore; developing practicable papermaking adds and fills out by wastewaters with modified calcium sulfate whiskers filler and papermaking application technology thereof; for improving the comprehensive utilization of solid waste, protect natural mineral resources, to save string significant, is also conducive to promote the Sustainable Healthy Development of paper industry.
Summary of the invention
The object of this invention is to provide a kind of product, preparation method and the application in papermaking thereof of modified calcium sulfate crystal whisker papermaking filler, to substitute the mineral fillers such as the calcium carbonate, china clay, talcum powder of extensive use in current paper industry, save string consumption simultaneously.
The technical solution used in the present invention is: a kind of modified calcium sulfate crystal whisker papermaking filler, it is characterized in that: carry out for calcium sulfate crystal whiskers raw material adds dissolution inhibition modifier solubility≤1.8g/l that modification is prepared gained, whiteness >=88%ISO, abrasion≤5mg, refractive index >=1.5, the calcium sulfate crystal whiskers papermaking filler of stable performance, its preparation method is: (1) selects purity >=95%, whiteness >=88%ISO; Whisker average length is 5-150 μ m, the calcium sulfate crystal whiskers raw material of mean breadth 1-25 μ m; (2) whisker modified processing: the suspension that above-mentioned calcium sulfate crystal whiskers raw material is mixed with to 3-30% concentration with mthod of white water from paper making or clear water, rotating speed with 100-2500 rev/min is uniformly mixed, add afterwards dissolution inhibition modifier to carry out modification, treatment temperature 5-60 ° of C, processing time 20-60 minute; Regulate pH of suspension value between 6.5-11, keep stirring, for subsequent use, can obtain finished product.
The method of preparing above-mentioned modified calcium sulfate crystal whisker papermaking filler, comprises the steps:
(1) calcium sulfate crystal whiskers raw material is selected: utilize calcium sulfate crystal whiskers raw material to carry out papermaking and add and fill out, wherein calcium sulfate crystal whiskers purity >=95%, whiteness >=88%ISO; Whisker average length is 5-150 μ m, mean breadth 1-25 μ m;
(2) whisker modified processing: the suspension that above-mentioned calcium sulfate crystal whiskers raw material is mixed with to 3-30% concentration with mthod of white water from paper making or clear water, rotating speed with 100-2500 rev/min is uniformly mixed, add afterwards dissolution inhibition modifier to carry out modification, treatment temperature 5-60 ° of C, processing time 20-60 minute; Regulate pH of suspension value between 6.5-11, keep stirring, for subsequent use; Can obtain solubility≤1.8g/l, whiteness >=88%ISO, abrasion≤5mg, refractive index >=1.5, the calcium sulfate crystal whiskers papermaking filler of stable performance.
Calcium sulfate crystal whiskers raw material is mainly derived from phosphate fertilizer by-product gypsum, desulfurized gesso of flue gas, citric acid by-product gypsum, preparing salt by working up seawater by-product gypsum, wet method phosphate rock-sulfuric acid accessory substance, metal smelt waste residue and other and is rich in the solid slag of calcium sulfate in described step (1).
In described step (1), calcium sulfate crystal whiskers material crystal water form is Ban Shui, two water, anhydrous or its any mixture; Whiskers shape is sheet, needle-like or spindle shape.
Dissolution inhibition modifier is more than any in Sodium Polyacrylate, natrium citricum, sodium potassium tartrate tetrahydrate, sodium phosphate trimer, sodium pyrophosphate, tertiary sodium phosphate, calgon, gluconic acid sodium salt, sodium metasilicate in described step (2).
In described step (2), the addition of dissolution inhibition modifier is the 0.5-5% to calcium sulfate crystal whiskers oven dry weight ratio.
The usage of above-mentioned modified calcium sulfate crystal whisker papermaking filler, is characterized in that: described modified calcium sulfate crystal whisker papermaking filler, for paper industry, comprises the steps:
(1) calcium sulfate crystal whiskers raw material is selected: utilize calcium sulfate crystal whiskers raw material to carry out papermaking and add and fill out, wherein calcium sulfate crystal whiskers purity >=95%, whiteness >=88%ISO; Whisker average length is 5-150 μ m, mean breadth 1-25 μ m;
(2) whisker modified processing: the suspension that above-mentioned calcium sulfate crystal whiskers raw material is mixed with to 3-30% concentration with mthod of white water from paper making or clear water, rotating speed with 100-2500 rev/min is uniformly mixed, add afterwards dissolution inhibitor to carry out modification, treatment temperature 5-60 ° of C, processing time 20-60 minute; Regulate pH of suspension value between 6.5-11, keep stirring, for subsequent use; Can obtain solubility≤1.8g/l, whiteness >=88%ISO, abrasion≤5mg, refractive index >=1.5, the calcium sulfate crystal whiskers papermaking filler of stable performance;
(3) copy paper slurry is selected: copy paper slurry can be selected bleach chemical pulp, group unbleached chemical pulp, semi-chemical pulp, chemi-mechanical pulp, Deinking Pulp, OCC or other plant fibrous raw material, above-mentioned paper pulp is through the making beating successor combination of anticipating, for copying tissue paper processed, wrapping paper/plate and other specific use paper;
(4) auxiliary material uses (to oven dry stock, weight ratio): AKD sizing agent 0-1.5%; Rosin sizes 0-1.5%; Calcium sulfate crystal whiskers filler 0-45%, does not comprise 0 point; Pearl filler 0-40%; Cationic starch 0-1.5%, PAM retention agent 0.01-0.15%, modification infusorial earth 0.1-0.8%; Sticking agent 0-0.5%; Organic fine particles 0-0.5%;
(5) page is manufactured paper with pulp: by the above-mentioned slurry preparing, after the operations such as purification, degasification, screening are processed, being delivered to head box by starching pump carries out copy paper; Regulate paper machine papermaking process parameter, online concentration: 0.5-1.2%; Online pH value: 6.5-9.5; Slurry network speed ratio: 1.0-1.1; Operation speed of a motor vehicle 100-2000m/min; Machine water concentration :≤0.5%; Go out wet end mass dryness fraction:>=16%; Quantitative 40-300g/m manufactures paper with pulp
2l Water Paper page or cardboard; L Water Paper page/cardboard of copying system through wet end squeezing, front dry processing, top sizing, after dry, press polish processing, the operation such as batch, can make the dissimilar paper or the cardboard that contain calcium sulfate crystal whiskers mineral filler;
(6) plain boiled water circulation: the machine water that calcium sulfate crystal whiskers adds in the process of filling out adopts closed circulation processing, slurry is rushed in the direct backflow of a large amount of plain boiled waters off the net and dilution is starched, and remaining plain boiled water enters polydisc recycling machine and recycles; In plain boiled water cyclic process, avoid as far as possible clear water to add, to avoid breaking water system dissolution equilibrium.
In described step (4), be a little located at slurry mixing pit, fan pump entrance, starching pump entrance or the arbitrary position of flow box adding of modified calcium sulfate crystal whisker papermaking filler; Add the amount of filling out and be controlled at the 5-45% to over dry slurry weight.
The inventive method equipment investment is few, and modified technique is simple, workable, cost savings.Calcium sulfate crystal whiskers product after modification, the coordination electronics that the calcium ion on calcium sulfate crystal whiskers surface and dissolution inhibition modifier provide forms stable complex, hinder the further dissolving of calcium sulfate crystal whiskers, retention at web part of paper machine significantly improves, plain boiled water load obviously reduces, can meet papermaking completely and add the instructions for use of filling out, the content of ashes of paper can be controlled within the scope of 4-40%.And under the condition of identical content of ashes, calcium sulfate crystal whiskers adds the paper of filling out and adds compared with calcium carbonate, china clay, talcum powder the paper of filling out and have better whiteness, intensity and bulk performance, can replace them completely and carry out paper and add and fill out.
Tool of the present invention has the following advantages:
(1) the calcium sulfate crystal whiskers raw material sources of employing are wide, condition is wide, can effectively solve the pollution that multiple industrial gypsum waste residue, metal smelt waste residue, the outer waste discharge slag of phosphate fertilizer manufacture etc. produce, and realize solid slag comprehensive utilization.
(2) wastewaters with modified calcium sulfate whiskers filler dissolubility is effectively controlled, and easily disperse in copy paper water paste, solve the water-soluble height that calcium sulfate crystal whiskers exists, the difficult problem such as low, plain boiled water rubbish ion concentration is high, the easy fouling of pipeline of retention when the papermaking filler, expand whisker Application Areas, improved whisker added value.
(3) compared with the papermaking fillers such as traditional calcium carbonate, china clay, talcum powder; calcium sulfate crystal whiskers filler have whiteness high, wear away the characteristics such as low, the rate of keeping here is high, cost is low; current calcium carbonate, china clay, talcum powder and Activities of Some Plants fibrous raw material be can substitute completely, natural mineral resources and timber resources protected.
(4) present device small investment, modified technique is simple, workable, and cost is low, is easy to large-scale production and application.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described, it should be understood that these embodiment, only for the object of illustration, never limit the scope of the invention.
embodiment 1:
Be 10m at volume
3band stir rustless steel container in add 8.5 tons of mthod of white water from paper making, under the mixing speed of 500 revs/min, slowly add 1.5 tons of purity>=95% that extract from wet method phosphate rock-sulfuric acid production process, whiteness>=88%ISO, average length is 80 μ m, mean breadth 5 μ m, crystal formation is the Dihydrate gypsum whiskers raw material of needle-like, is mixed with the suspension of 15% concentration; Under stirring, add the Sodium Polyacrylate dissolution inhibitor of 0.5% consumption (to over dry whisker weight), control 500 revs/min of mixing speeds, temperature 20-25 ° of C, time 15-20min; Afterwards, regulate pH of suspension value 8.0-9.0, can obtain solubility≤1.8g/l, whiteness>=88%ISO, abrasion≤5mg, refractive index>=1.5, the calcium sulfate crystal whiskers papermaking filler of stable performance, for subsequent use.With slurry by carrying out in the ratio of 75%:10%:15% through appropriate Aspen APMP slurry of pulling an oar, CTMP slurry, three kinds of slurries of chemical softwood pulp, and add cationic starch 5kg/ ton slurry, AKD sizing agent 8kg/ ton to starch; Send into four sections of hydrocyclones of one-level through fan pump and purify slagging-off, then enter degassing tank and carry out degassed processing; Enter afterwards pressurized screen and carry out Screening Treatment (adding cationic PAM consumption 0.5kg/ ton slurry, modified alta-mud 3kg/ ton slurry), enter flow box; Add the above-mentioned calcium sulfate crystal whiskers preparing at flow box place, addition is 200kg/ ton slurry, regulates slurry flow online, carries out l Water Paper page and manufactures paper with pulp; L Water Paper page goes out to enter press section after wet end and carry out five roller three nip unipress, squeezes to mass dryness fraction>=39% and enters front drying section; Front dryer cylinder surface temperature control is dried processing at 90～120 ° of C to page, to web dryness>=90%; Enter metering bar type sizing applicator and carry out top sizing, spread 1-2g/m
2.Then go out surface size press, enter rear dry processing; Rear dryer cylinder temperature, at 40～130 DEG C, goes out rear drying section web dryness>=93%; The page that goes out rear drying section enters press polish district, and page is carried out to press polish processing, and calendering temperature is controlled at 100 DEG C, and press polish pressure is controlled at 80kg/cm; After press polish, paper is batched, can obtain whiteness>=80%ISO, smoothness>=15s, bulk>=1.4m
3/ kg, surface strength>=1.0m/s, the good light-duty printing paper of printing performance of ash content>=15%.
embodiment 2:
Be 10m at volume
3band stir rustless steel container in add 8.0 tons, clear water, under the mixing speed of 800 revs/min, slowly add 2.0 tons of purity>=95% that extract from phosphogypsum slag, whiteness>=90%ISO, average length is 50 μ m, mean breadth 2 μ m, crystal formation is the Dihydrate gypsum whiskers of needle-like, is mixed with the suspension of 20% concentration; Under stirring, add the natrium citricum dissolution inhibitor of 1% consumption (to over dry whisker weight), control 800 revs/min of mixing speeds, treatment temperature 25-30 ° of C, processing time 20-30min; Afterwards, regulate pH of suspension value at 8.0-9.0, can obtain solubility≤1.8g/l, whiteness>=90%ISO, abrasion≤5mg, refractive index>=1.5, the calcium sulfate crystal whiskers papermaking filler of stable performance, for subsequent use.NBKP slurry through appropriateness making beating, DIP slurry, three kinds of slurries of APMP slurry are carried out with slurry in the ratio of 10%:80%:10%, and add 300kg/ ton to starch calcium sulfate crystal whiskers filler (adding a little in starching pump porch), 12kg/ ton slurry AKD sizing agent, 8kg/ ton slurry cationic starch, 0.5kg/ ton slurry PAM, 2kg/ ton slurry modified alta-mud, appropriate brightening agent are mixed with online slurry, online; Carry out double dewatering by folded net, l Water Paper page enters shoe press, after front dry processing, carries out top sizing processing, and control surface resin added is at 1-2g/m
2, dry processing after the l Water Paper page after top sizing enters.The rear mass dryness fraction of rear dry processing enters mechanical press polish at 92～94% page and carries out ornamenting processing, and calendering temperature is controlled at 120 DEG C, and press polish pressure is controlled at 40KN/m; After press polish, paper is batched, can obtain is quantitatively 55-80g/m
2, bulk 1.10-1.20cm
3/ g, whiteness>=90%ISO, smoothness>=25s, Cobb value≤35g/m
2, content of ashes>=25%, the longitudinal fracture length>=4000m of roll web, picking speed is not less than 1.0m/s, the web offset paper that printability is good.
embodiment 3:
Be 10m at volume
3band stir rustless steel container in add 8.5 tons of mthod of white water from paper making, under the mixing speed of 500 revs/min, slowly add 1.5 tons of purity>=95% that extract from desulfurated plaster, whiteness>=92%ISO; Average length is 20 μ m, mean breadth 2 μ m, and crystal formation is fusoid Dihydrate gypsum whiskers, is mixed with the suspension of 15% concentration; Under stirring, add the sodium phosphate trimer dissolution inhibitor of 1.5% consumption (to over dry whisker weight), control 500 revs/min of mixing speeds, treatment temperature 30-35 ° of C, processing time 30-45min; Afterwards, regulate pH of suspension value at 8.0-8.5, can obtain solubility≤1.8g/l, whiteness>=92%ISO, abrasion≤5mg, refractive index>=1.5, the calcium sulfate crystal whiskers papermaking filler of stable performance, for subsequent use.NBKP slurry, LBKP slurry through appropriateness making beating are carried out with slurry in the ratio of 20%:80%, add the above-mentioned calcium sulfate crystal whiskers filler (add and be a little located at fan pump entrance) of 250kg/ ton slurry, 10kg/ ton slurry AKD sizing agent, 8kg/ ton slurry cationic starch, 0.3kg/ ton slurry PAM, 0.2kg/ ton slurry cationic organic particles, 2kg/ ton slurry modified alta-mud, appropriate brightening agent are mixed with online slurry, control slurry network speed than 1.01, surf the Net; Carry out double dewatering by folded net, l Water Paper page enters shoe press, after front dry processing, adopts top sizing processing, and control surface resin added is at 1-2g/m
2, dry processing after the l Water Paper page after top sizing enters.After dry processing later, mass dryness fraction enters mechanical press polish ornamenting processing at 92～94% page, and calendering temperature is controlled at 160 DEG C, and press polish pressure is controlled at 80KN/m; After press polish, paper is batched, can obtain is quantitatively 60-100 g/m
2, bulk 1.20 cm
3/ g, whiteness>=90%ISO, smoothness>=20s, PPS≤5 μ m, Cobb value≤35g/m
2, the high-quality electro-photographic paper of content of ashes>=20%.
embodiment 4:
Be 10m at volume
3band stir rustless steel container in add 7.5 tons, clear water, under the mixing speed of 1000 revs/min, slowly add 2.5 tons of purity>=95% that extract from nickel minerals melting waste slag, whiteness>=90%ISO, the sheet Dihydrate gypsum whiskers of average grain diameter 5 μ m, is mixed with the suspension of 25% concentration; Under stirring, add the sodium pyrophosphate dissolution inhibitor of 2% consumption (to over dry whisker weight), control 1000 revs/min of mixing speeds, treatment temperature 35-40 ° of C, processing time 45-60min; Afterwards, regulate pH of suspension value 9.0, can obtain solubility≤1.8g/l, whiteness>=90%ISO, abrasion≤5mg, refractive index>=1.5, the calcium sulfate crystal whiskers papermaking filler of stable performance, for subsequent use.NBKP slurry through appropriateness making beating, DIP slurry, APMP slurry are carried out with slurry in the ratio of 25%: 35%: 40%, and the above-mentioned calcium sulfate crystal whiskers filler (add and be a little located at slurry mixing pit) that adds 150kg/ ton to starch, 8kg/ ton slurry cationic starch, 0.3kg/ ton slurry PAM, 0.2kg/ ton slurry cationic organic particles, 2kg/ ton slurry modified alta-mud, appropriate brightening agent are mixed with online slurry, online; Carry out double dewatering by folder net former, l Water Paper page enters shoe press, after front dry processing, enters the coating of surface metrology bar type, and one side coating weight is at 8g/m
2; The each component of formulation for coating material is by weight: CaCO
380 parts, 20 parts of kaolin, 8 parts, latex, 5 parts of starch, 1 part of lubricant, 1 part of water repellent agent, 0.5 part of water retention agent, coating solid content 63%.After coating, l Water Paper page is through infra-red drying, heated-air drying, press polish, batches and can obtain quantitatively at 60-80g/m
2, whiteness>=85%ISO, smoothness>=400s, opacity>=85%, longitudinally fracture length>=4200m, surface strength>=1.0s/m, the featherweight coated paper with good printability of ash content>=30%.
embodiment 5:
Be 10m at volume
3band stir rustless steel container in add 8.0 tons of mthod of white water from paper making, under the mixing speed of 1500 revs/min, slowly add 2.0 tons of purity>=95% that extract from citric acid by-product gypsum waste residue, whiteness>=92%ISO, average length is 10 μ m, mean breadth 2 μ m, crystal formation is the Dihydrate gypsum whiskers of needle-like, is mixed with the suspension of 20% concentration; Under stirring, add the tertiary sodium phosphate dissolution inhibitor of 3% consumption (to over dry whisker weight), control 1500 revs/min of mixing speeds, treatment temperature 45-50 ° of C, processing time 25-30min; Afterwards, regulate pH of suspension value at 8.5-9.0, can obtain solubility≤1.8g/l, whiteness>=90%ISO, abrasion≤5mg, refractive index>=1.5, the calcium sulfate crystal whiskers papermaking filler of stable performance, for subsequent use.Deinking office waste paper slurry through appropriateness making beating, natural-color straw pulp semi-chemical pulp, the yellow plate secondary stock of true qualities are carried out with slurry in the ratio of 20%:20%:60%, and the above-mentioned calcium sulfate crystal whiskers filler (add and be a little located at slurry mixing pit) that adds 200kg/ ton to starch, stickies control agent 0.2kg/ ton slurry, 0.3kg/ ton slurry PAM, 2kg/ ton slurry modified alta-mud, sticking agent 0.2kg/ ton slurry, rosin sizes 5kg/ ton slurry, is mixed with online slurry; After copying forebay, fan pump, net fore worker, dilution water head box, on folder net former, dehydration forms l Water Paper page, and wet end l Water Paper page out enters four roller tri-nip presses, goes out to squeeze mass dryness fraction and is controlled at 46-48%; Enter afterwards oven dry portion and be dried, go out oven dry portion web dryness at 92-94%, then through batching, after rewinding, obtain quantitative 120-200g/m
2, tightness>=0.45g/cm
3, longitudinally fracture length>=3000m, water imbibition≤60g/m
2, ash content>=15%, the fluting medium of ring crush index>=5.0 Nm/g.
Claims (7)
1. a modified calcium sulfate crystal whisker papermaking filler, it is characterized in that: carry out for calcium sulfate crystal whiskers raw material adds dissolution inhibition modifier solubility≤1.8g/L that modification is prepared gained, whiteness >=88%ISO, abrasion≤5mg, refractive index >=1.5, the calcium sulfate crystal whiskers papermaking filler of stable performance, its preparation method is: (1) selects purity >=95%, whiteness >=88%ISO; Whisker average length is 5-150 μ m, the calcium sulfate crystal whiskers raw material of mean breadth 1-25 μ m; (2) whisker modified processing: the suspension that above-mentioned calcium sulfate crystal whiskers raw material is mixed with to 3-30% concentration with mthod of white water from paper making or clear water, rotating speed with 100-2500 rev/min is uniformly mixed, add afterwards dissolution inhibition modifier to carry out modification, treatment temperature 5-60 DEG C, processing time 20-60 minute, wherein dissolution inhibition modifier is more than any in Sodium Polyacrylate, natrium citricum, sodium potassium tartrate tetrahydrate, sodium phosphate trimer, sodium pyrophosphate, tertiary sodium phosphate, calgon, gluconic acid sodium salt, sodium metasilicate; Regulate pH of suspension value between 6.5-11, keep stirring, for subsequent use, can obtain finished product.
2. prepare a method of weighing modified calcium sulfate crystal whisker papermaking filler described in 1, it is characterized in that: comprise the steps:
(1) calcium sulfate crystal whiskers raw material is selected: utilize calcium sulfate crystal whiskers raw material to carry out papermaking and add and fill out, wherein calcium sulfate crystal whiskers purity >=95%, whiteness >=88%ISO; Whisker average length is 5-150 μ m, mean breadth 1-25 μ m;
(2) whisker modified processing: the suspension that above-mentioned calcium sulfate crystal whiskers raw material is mixed with to 3-30% concentration with mthod of white water from paper making or clear water, rotating speed with 100-2500 rev/min is uniformly mixed, add afterwards dissolution inhibition modifier to carry out modification, treatment temperature 5-60 DEG C, processing time 20-60 minute, wherein dissolution inhibition modifier is more than any in Sodium Polyacrylate, natrium citricum, sodium potassium tartrate tetrahydrate, sodium phosphate trimer, sodium pyrophosphate, tertiary sodium phosphate, calgon, gluconic acid sodium salt, sodium metasilicate; Regulate pH of suspension value between 6.5-11, keep stirring, for subsequent use; Can obtain solubility≤1.8g/L, whiteness >=88%ISO, abrasion≤5mg, refractive index >=1.5, the modified calcium sulfate crystal whisker papermaking filler of stable performance.
3. method according to claim 2, is characterized in that: calcium sulfate crystal whiskers raw material is mainly derived from phosphate fertilizer by-product gypsum, desulfurized gesso of flue gas, citric acid by-product gypsum, preparing salt by working up seawater by-product gypsum, wet method phosphate rock-sulfuric acid accessory substance, metal smelt waste residue and other and is rich in the solid slag of calcium sulfate in described step (1).
4. method according to claim 2, is characterized in that: in described step (1), calcium sulfate crystal whiskers material crystal water form is Ban Shui, two water, anhydrous or its any mixture; Whiskers shape is sheet, needle-like or spindle shape.
5. method according to claim 2, is characterized in that: in described step (2), the addition of dissolution inhibitor is the 0.5-5% to calcium sulfate crystal whiskers oven dry weight ratio.
6. a usage for modified calcium sulfate crystal whisker papermaking filler described in claim 1, is characterized in that: described modified calcium sulfate crystal whisker papermaking filler, for paper industry, comprises the steps:
(1) calcium sulfate crystal whiskers raw material is selected: utilize calcium sulfate crystal whiskers raw material to carry out papermaking and add and fill out, wherein calcium sulfate crystal whiskers purity >=95%, whiteness >=88%ISO; Whisker average length is 5-150 μ m, mean breadth 1-25 μ m;
(2) whisker modified processing: the suspension that above-mentioned calcium sulfate crystal whiskers raw material is mixed with to 3-30% concentration with mthod of white water from paper making or clear water, rotating speed with 100-2500 rev/min is uniformly mixed, add afterwards dissolution inhibition modifier to carry out modification, treatment temperature 5-60 DEG C, processing time 20-60 minute; Regulate pH of suspension value between 6.5-11, keep stirring, for subsequent use; Can obtain solubility≤1.8g/L, whiteness >=88%ISO, abrasion≤5mg, refractive index >=1.5, the modified calcium sulfate crystal whisker papermaking filler of stable performance;
(3) copy paper slurry is selected: copy paper slurry is selected bleach chemical pulp, group unbleached chemical pulp, semi-chemical pulp, chemi-mechanical pulp, Deinking Pulp, OCC or other plant fibrous raw material, above-mentioned paper pulp is through the making beating successor combination of anticipating, for copying tissue paper processed, wrapping paper/plate and other specific use paper;
(4) auxiliary material uses oven dry stock, weight ratio: AKD sizing agent 0-1.5%; Rosin sizes 0-1.5%; Wastewaters with modified calcium sulfate whiskers filler 0-45%, does not comprise 0 point; Pearl filler 0-40%; Cationic starch 0-1.5%, PAM retention agent 0.01-0.15%, modification infusorial earth 0.1-0.8%; Sticking agent 0-0.5%; Organic fine particles 0-0.5%;
(5) page is manufactured paper with pulp: by the above-mentioned slurry preparing, after purification, degasification, screening process are processed, be delivered to head box carry out copy paper by starching pump; Regulate paper machine papermaking process parameter, online concentration: 0.5-1.2%; Online pH value: 6.5-9.5; Slurry network speed ratio: 1.0-1.1; The operation speed of a motor vehicle: 100-2000m/min; Machine water concentration :≤0.5%; Go out wet end mass dryness fraction:>=16%; Quantitative 40-300 g/m manufactures paper with pulp
2l Water Paper page or cardboard; L Water Paper page/cardboard of copying system through wet end squeezing, front dry processing, top sizing, after dry, press polish processing, coiling process, make the dissimilar paper or the cardboard that contain calcium sulfate crystal whiskers mineral filler;
(6) plain boiled water circulation: the machine water that wastewaters with modified calcium sulfate whiskers adds in the process of filling out adopts closed circulation processing, slurry is rushed in the direct backflow of a large amount of plain boiled waters off the net and dilution is starched, and remaining plain boiled water enters polydisc recycling machine and recycles; In plain boiled water cyclic process, avoid as far as possible clear water to add, to avoid breaking water system dissolution equilibrium.
7. usage according to claim 6, it is characterized in that: in described step (4), be a little located at slurry mixing pit, fan pump entrance, starching pump entrance or the arbitrary position of flow box adding of wastewaters with modified calcium sulfate whiskers filler, adds the amount of filling out and be controlled at the 5-45% to over dry slurry weight.
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