SE417104B - SET TO CLEAN RESPECTIVE PINK POLLUTANED CALCIUM SULPHATE INTENDED TO BE USED AS PIGMENT AND / OR FILLER - Google Patents
SET TO CLEAN RESPECTIVE PINK POLLUTANED CALCIUM SULPHATE INTENDED TO BE USED AS PIGMENT AND / OR FILLERInfo
- Publication number
- SE417104B SE417104B SE7811216A SE7811216A SE417104B SE 417104 B SE417104 B SE 417104B SE 7811216 A SE7811216 A SE 7811216A SE 7811216 A SE7811216 A SE 7811216A SE 417104 B SE417104 B SE 417104B
- Authority
- SE
- Sweden
- Prior art keywords
- calcium sulphate
- chlorine
- bleaching
- weight
- water
- Prior art date
Links
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title claims description 27
- 235000011132 calcium sulphate Nutrition 0.000 title claims description 13
- 239000001175 calcium sulphate Substances 0.000 title claims description 11
- 239000000049 pigment Substances 0.000 title claims description 6
- 238000000034 method Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000004061 bleaching Methods 0.000 claims description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 8
- 239000000460 chlorine Substances 0.000 claims description 8
- 229910052801 chlorine Inorganic materials 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 150000001805 chlorine compounds Chemical class 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 3
- 238000005194 fractionation Methods 0.000 claims description 3
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 235000009508 confectionery Nutrition 0.000 claims description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims 2
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims 2
- 239000004155 Chlorine dioxide Substances 0.000 claims 1
- 239000003610 charcoal Substances 0.000 claims 1
- 235000019398 chlorine dioxide Nutrition 0.000 claims 1
- 150000002978 peroxides Chemical class 0.000 claims 1
- 239000010440 gypsum Substances 0.000 description 13
- 229910052602 gypsum Inorganic materials 0.000 description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 8
- 238000000576 coating method Methods 0.000 description 7
- 239000002270 dispersing agent Substances 0.000 description 7
- 239000000123 paper Substances 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 239000008199 coating composition Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 3
- 239000011111 cardboard Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011505 plaster Substances 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 229940070527 tourmaline Drugs 0.000 description 1
- 229910052613 tourmaline Inorganic materials 0.000 description 1
- 239000011032 tourmaline Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/02—Compounds of alkaline earth metals or magnesium
- C09C1/025—Calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
7811216-6 g 2 10 15 20 25 30 35 0,1 - 1%, företrädesvis 0,3 - 0,5% aktivt klor, räknat på möng- den kalciumsulfat. 7811216-6 g 2 10 15 20 25 30 35 0.1 - 1%, preferably 0.3 - 0.5% active chlorine, calculated on the amount of calcium sulphate.
Enligt en annan utföringsform renas kalciumsulfaten genom fraktionering, företrädesvis i cyklon, före eller efter blek- ningen, för avlögsnande av icke önskvärda partiklar.In another embodiment, the calcium sulfate is purified by fractionation, preferably in cyclone, before or after bleaching, to remove unwanted particles.
Efter blekningen bör kalciumsulfaten tvättas med vatten, t ex på filter eller i kolonn, för avlägsnande av klorrester, klorider och oxiderande föreningar.After bleaching, the calcium sulphate should be washed with water, for example on a filter or in a column, to remove chlorine residues, chlorides and oxidizing compounds.
Uppfinningen skall i det följande nörmare beskrivas medelst ett utföringsexempel samt med hänvisning till bifogade ritning utvisande ett blockschema över ett sött att genomföra metoden.The invention will be described in more detail below by means of an exemplary embodiment and with reference to the accompanying drawing showing a block diagram of a method of carrying out the method.
EXEMPEL Som råmaterial enligt denna utföringsform användes avfallsgips erhållen vid tillverkning av fosforsyra. Materialet slammades upp 1 i vatten till en torrhalt av ca 15 viktprocent. pH-värdet för uppslamningen inställdes på ett värde understigande 3. Öetta värde är kritiskt - vid högre pH-vörden fastnar nämligen miss- färgande föroreningar på gipspartiklarna. Gips av den typ som här kom till användning innehåller som föroreningar förutom organiskt material, grovt missfärgad gips, kalciumfluorid och silikater från tidigare processer. Om pH-värdet för uppslamningen överstiger 3 sker surgörning lämpligen medelst svavelsyra.EXAMPLES As raw material according to this embodiment, waste gypsum obtained in the manufacture of phosphoric acid is used. The material was slurried in water to a dry content of about 15% by weight. The pH value of the slurry was set to a value below 3. This value is critical - at higher pH values, discolouring contaminants adhere to the gypsum particles. Gypsum of the type used here contains as impurities in addition to organic material, coarsely discolored gypsum, calcium fluoride and silicates from previous processes. If the pH value of the slurry exceeds 3, acidification is suitably carried out by means of sulfuric acid.
Den erhållna uppslamningen fraktionerades sedan i en hydrocyklon 2, varvid man tillvaretog en fraktion med partikelstorlek av 25- 100)» Partikelstorleken bör inte understiga 25/h då annars den i ett senare processteg följande avvattningen avsevärt försvåras.The resulting slurry was then fractionated in a hydrocyclone 2, recovering a fraction with a particle size of 25-100. The particle size should not be less than 25 / h, otherwise the dewatering following a later process step is considerably more difficult.
Fraktionen innehållande partiklar med en storlek över IOOp ut- göres delvis av mörkförgade partiklar sam till en del består av turmalin. Råfosfaten som utgör utgångsmaterialet för framställ- ning av fosforsyra finns emellertid i många olika kvaliteter och föroreningarna kan därför vara av varierande slag.The fraction containing particles with a size above 100p consists partly of dark-colored particles and partly consists of tourmaline. However, the crude phosphate which is the starting material for the production of phosphoric acid is available in many different qualities and the impurities can therefore be of varying types.
Fraktioneringen utfördes i två steg 3 resp 4, i det första ste- get avlägsnades den grövre fraktianen och i det senare den finare fraktionen och bortfördes ur processen som avfall. Genom att ut- föra separeringen på detta sött ör man oberoende av de i den fos- forsyrafabrik, från vilken gipsen hömtats, rådande driftsförhåll- andena. Den erhållna slurryn hade en torrhalt av ca 45 vikt- procent. 10 15 20 25 30 35 7811216-'6 Den tillvaratagna fraktionen blektes sedan i en kontinuerlig blek- ningsanlöggning 5 genom tillsats av klorvatten 6. Genom denna tillsats sjönk torrsubstanshalten till ca 20 viktprocent. Sedan klorvattnet tillförts instölldes pH-värdet på 3 och blekningen utfördes genom omrörning i två seriekopplade tankar för att få en förlängd uppehållstid. Mängden tillfört klor uppgick till 0.5 viktprocent räknat på torr gips. Efter blekningen förtjocka- des slurryn till en torrsubstanshalt av ca 35 viktprocent i en sedimentationsförtjockare. 1 I ett följande steg 7 tvättades sedan gipsen för avlägsnande av skumbildonde medel, klorider, organiskt material och andra föro- reningar. Tvättningen utfördes kontinuerligt medelst vatten 8 i motström i vertikalstflllda rör, varvid gipsen tas ut nedtill medelst en skruv. Vid tvöttningen erhölls samtidigt en förtjock- ning till ca 45 viktprocent torrholt. ' Filtrering av den från tvättningssteget erhållna slurryn utfördes sedan på roterande vakuumfilter 9 med samtidig pöspritsning av vatten för att främst avlägsna resterande klorider.l Från filtret erhölls en ren, blekt produkt med en torrhalt av ca 75 viktprocent.The fractionation was carried out in two steps 3 and 4, respectively, in the first step the coarser fraction and in the latter the finer fraction were removed and removed from the process as waste. By carrying out the separation on this sweet, the prevailing operating conditions are independent of those prevailing in the phosphoric acid factory from which the gypsum was obtained. The resulting slurry had a dry content of about 45% by weight. The recovered fraction was then bleached in a continuous bleaching plant 5 by adding chlorine water 6. By this addition the dry matter content dropped to about 20% by weight. After the chlorine water was added, the pH was adjusted to 3 and the bleaching was carried out by stirring in two series-connected tanks to obtain an extended residence time. The amount of chlorine added was 0.5% by weight based on dry gypsum. After bleaching, the slurry was thickened to a dry matter content of about 35% by weight in a sedimentation thickener. In a subsequent step 7, the gypsum was then washed to remove foaming agents, chlorides, organic material and other contaminants. The washing was carried out continuously by means of water 8 in countercurrent in vertically placed pipes, whereby the plaster is removed at the bottom by means of a screw. During the washing, a thickening to about 45% by weight of dry wood was obtained at the same time. Filtration of the slurry obtained from the washing step was then carried out on a rotary vacuum filter 9 with simultaneous spraying of water to mainly remove residual chlorides.
Avlappen 10 resp 11 från tvättning 7 resp filtrering 9 kan bort- föras gemensamt 22. 7 Den enligt uppfinningen framställda kalciumsulfaten är sär- skilt lömplig för användning som pigment i bestrykningsmedel för papper, kartong eller liknande eller som fyllnadsmedel.The drains 10 and 11, respectively, from washing 7 or filtration 9 can be removed together 22. The calcium sulphate prepared according to the invention is particularly suitable for use as a pigment in coatings for paper, cardboard or the like or as a filler.
Huvudbeståndsdelarna i en bestrykningskomposition, antingen denna skall användas för bestrykning av papper ooh kartong eller som målarfärg, utgöres av fig.ment, bindemedel och vötskefas. I allmänhet är det även nödvändigt att tillsätta ett dispergerings- medel för att erhålla en god fördelning av pigmentet. Samtidigt kan man därvid ofta minska kompositionens viskositet, vilket inne- bär att man kan åstadkomma en högre torrhalt, utan att strykbar- heten försämras.The main constituents of a coating composition, whether to be used for coating paper or cardboard or as a paint, are utgör g.ment, binder and liquid phase. In general, it is also necessary to add a dispersant to obtain a good distribution of the pigment. At the same time, the viscosity of the composition can often be reduced, which means that a higher dry content can be achieved, without the ironability deteriorating.
När det gäller bestrykning av papper, kartong eller liknande användes konventionellt kaolin, titandioxid eller krita som pig- ment. Det har emellertid även föreslagits att onvönäa gips. Att gips inte fått någon praktisk användning beror troligen på, att man ansett att gipsen kräver väsentligen mera dispergeringsmedel.When coating paper, cardboard or the like, conventional kaolin, titanium dioxide or chalk were used as pigments. However, it has also been suggested to use plaster. The fact that gypsum has not received any practical use is probably due to the fact that it has been considered that the gypsum requires significantly more dispersant.
Tidigare använda bindemedel för bestrykningskompositioner utgöres t ek av vattenlösliga substanser som stärkelse och kossein, , 7811216-6 10 15 20 25 30 35 eller av dispersioner av olika polymerer i vatten, t ex polyakry- lat, polymetaakrylat och polyvinylalkohol. Det är emellertid i och för sig känt att använda vissa cellulosaderivat, t ex metyl- cellulosa, etylcellulosa, hydroxietylcellulosa och karboximetyl- cellulosa.Previously used binders for coating compositions are, for example, water-soluble substances such as starch and cosine, or dispersions of various polymers in water, for example polyacrylate, polymethacrylate and polyvinyl alcohol. However, it is known per se to use certain cellulose derivatives, for example methylcellulose, ethylcellulose, hydroxyethylcellulose and carboxymethylcellulose.
Som dispergeringsmedel förefinnes ett stort antal medel till- De utan jämförelse mest använda ör olika typer av fos- fater, särskilt natriumhexametafosfat. Detta dispergeringsmedel uppvisar emellertid, liksom flera andra, vissa nackdelar. Sö- ledes nedsättes ofta bindekraften hos det använda bindemedlet.As dispersants, there are a large number of compositions which are by far the most widely used for various types of phosphates, especially sodium hexametaphosphate. However, this dispersant, like several others, has certain disadvantages. Thus, the binding force of the binder used is often reduced.
Vidare kan dessa dispergeringsmedel i vissa fall vid användning för bestrykning av papper, som skall tryckas i offset-tryck, ge orsak 'till en emulgering av tryckfärgen i offset-vattnet och en därav följande icke önskad toning av trycket.Furthermore, in some cases these dispersants, when used for coating paper to be printed in offset printing, can give rise to an emulsification of the ink in the offset water and a consequent undesired toning of the print.
Med hänsyn till vad som ovan angivits användes vid förfaran- det enligt föreliggande metod i huvudsak ett dispergeringsmedel som själv verkar som bindemedel, nämligen en med karboxylgrupper gängliga. substituerad polysackarid.In view of the above, the process according to the present method mainly uses a dispersant which itself acts as a binder, namely one available with carboxyl groups. substituted polysaccharide.
Det har härvid visat sig vara helt avgörande att gipsen m0- les i närvaro av en med karboximetylgrupper substituerad poly- sackarid.It has proved to be absolutely crucial that the gypsum is ground in the presence of a polysaccharide substituted with carboxymethyl groups.
Enligt ett särskilt fördelaktigt sätt sker malningen i när- varo av vatten.According to a particularly advantageous method, the grinding takes place in the presence of water.
Vid de olika försök som utförts i samband med utvecklingen av metoden har det visat sig att särskilt goda resultat erhölls vid malning med karboximetylcellulosa, vanligen betecknad CNC, och då med ett material med en medelmolekylvikt av 10.000 - 500.000, företrädesvis 20.000 - 150.000. Vid användningen av CMC tillsättes denna i en mängd av 0.5 - 3 viktprocent, räknat på mängden torr kalciumsulfat.In the various experiments carried out in connection with the development of the method, it has been found that particularly good results were obtained in milling with carboxymethylcellulose, usually referred to as CNC, and then with a material with an average molecular weight of 10,000 - 500,000, preferably 20,000 - 150,000. When using CMC, it is added in an amount of 0.5 - 3% by weight, based on the amount of dry calcium sulphate.
Kalciumsulfatens partikelstorlekär väsentlig i sammanhangen.The particle size of calcium sulphate is significant in this context.
Om man således önskar framställa en bestrykningskomposition för erhållande av ett matt papper, bör gipsen har en sådan partikel- storleksfördelning att 30 viktprocent har en storlek mindre än 2 p. För bestrykningskompositioner för erhållande av ett glansigt papper bör 95 viktprocent av materialet ha en partikelstorlek mindre än 2,p. Ifråga om pigment för fyllnadsmedel bör kalciumsul- 'fatens partikelstorlek vara sådan att 50 viktprocent av materialet har en storlek mindre än 5 fu 10 15 20 25 30 35 40 7811216-'6 Partikelstorleksfördelningen enligt ovan har bestämts medelst en sedimenteringsapparat enligt Åndreasen, vilken apparat i Sverige tillhandahållas av företaget Kebo Grave under nummerbeteckningen 111.904. Provet beredes genom att ca 10g gipssmet utväges och till- sättes 2 ml av en 1%-ig CNC-lösning, varefter smeten röres ut med ca 40 ml vatten. Provet överföres till sedimenteringsapparaten och med pipetten uttages mängder av 10 ml enligt följande schema: 1:a provet 0-prov 2:a provet efter 60 min 3:e provet efter 120 min 4:e provet efter 1080 min 5:e provet efter 1560 min Enligt en särskild utföringsform tillsättes ett bindemedel, t ex latex eller stärkelse. Sådan tillsats bör lämpligen ske efter malningen.Thus, if it is desired to prepare a coating composition for obtaining a matte paper, the gypsum should have such a particle size distribution that 30% by weight has a size less than 2 p. For coating compositions for obtaining a glossy paper, 95% by weight of the material should have a particle size smaller than 2, p. In the case of filler pigments, the particle size of the calcium sulphate should be such that 50% by weight of the material has a size less than 5 .mu.l The particle size distribution as above has been determined by means of a sedimentation apparatus according to Åndreasen, which apparatus in Sweden is provided by the company Kebo Grave under the number designation 111,904. The sample is prepared by weighing about 10 g of gypsum batter and adding 2 ml of a 1% CNC solution, after which the batter is stirred out with about 40 ml of water. The sample is transferred to the sedimentation apparatus and with the pipette quantities of 10 ml are taken according to the following schedule: 1st sample 0-sample 2nd sample after 60 min 3rd sample after 120 min 4th sample after 1080 min 5th sample after 1560 min According to a special embodiment, a binder, eg latex or starch, is added. Such addition should suitably take place after grinding.
Som ovan nämnts är en hög torrhalt av stor betydelse för ett effektivt och ekonomiskt bestrykningsmedel. Med det valda binde- medlet/dispersionsmedlet och den utnyttjade metodiken kan man uppnå så höga torrhalter som 60 - 80 viktprocent för bestrykningsmedel för erhållande av matt papper. För bestrykningsmedel för erhållande av glansigt papper, har man uppnått torrhalter av 55 - 80 vikt- procent.As mentioned above, a high dry matter content is of great importance for an efficient and economical coating agent. With the selected binder / dispersant and the methodology used, dry contents as high as 60 - 80% by weight can be achieved for coatings for obtaining matt paper. For coatings for obtaining glossy paper, dry contents of 55-80% by weight have been achieved.
Enligt en särskild utföringsform utföres malningen vid för- höjd temperatur, företrädesvis vid en temperatur understigande 130°C.According to a special embodiment, the grinding is carried out at elevated temperature, preferably at a temperature below 130 ° C.
Framställningen av bestrykningsmedel kan med hänvisning till ritningen konkret utföras på följande sätt.The preparation of coatings can be carried out concretely with reference to the drawing in the following manner.
Den från exempel ovan erhållna produkten tillfördes en dis- pergeringsutrustning 12 under samtidig tillförsel 13 av 1,6 vikt- procent karboximetylcellulosa (CNC), räknat på torr gips, i form Därefter höjes pH till 12 genom tillsats av natriumhydroxid, då som i föreliggande fall, gips innesluter av en 1,4%-ig lösning. mindre mängder fosforsyra som frigöres vid den efterföljande mal- ningen. Vidare kan blandningen tillsättes konventionella glans- höjare, skumdämpare, optiska vitmedel, färgämnen och konserverings- medel, allt efter önskemål. ningskärlet kontinuerligt för erhållande av en genomströmning av De olika komponenterna tillföres bland- 3 . . . ca 4 m /h. Dispergeringen astadkommes medelst en hastigt rote- rande omrörare.The product obtained from the above example was added to a dispersing equipment 12 while simultaneously feeding 13 of 1.6% by weight of carboxymethylcellulose (CNC), calculated on dry gypsum, in the form. Then the pH is raised to 12 by adding sodium hydroxide, then as in the present case , plaster encloses a 1.4% solution. smaller amounts of phosphoric acid which are released during the subsequent grinding. Furthermore, conventional gloss enhancers, defoamers, optical brighteners, dyes and preservatives can be added to the mixture, as desired. The mixing vessel is continuously fed to obtain a flow-through of the various components. . . about 4 m / h. The dispersion is effected by means of a rapidly rotating stirrer.
Från dispergeringssteget 12 överföras materialet kontinuer- ligt till en vakuumavluftare 14 för att avlägsna innesluten luft.From the dispersing step 12, the material is continuously transferred to a vacuum deaerator 14 to remove entrapped air.
Efter avluftningen maldes dispersionen i en pärlkvarn 15 7811216-6 vid en temperatur av ca 50°C i ett enda steg, kyldes 16 och si- lades i en sjölvrensande sil 17. Som slutprodukt 18 erhölls en lagringsstabil slamma med en torrhalt av 71%. Produkten ör pump- bar och kan levereras fylld på tank eller fat.After venting, the dispersion was ground in a bead mill at a temperature of about 50 ° C in a single step, cooled 16 and sieved in a self-cleaning strainer 17. As a final product 18 a storage stable sludge with a dry content of 71% was obtained. The product is pumpable and can be delivered filled in a tank or barrel.
Uppfinníngen ör icke begränsad till de beskrivna utföríngs- formerna, utan kan varieras inom uppfínningstankens ram.The invention is not limited to the described embodiments, but can be varied within the scope of the inventive concept.
Claims (5)
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7811216A SE417104B (en) | 1978-10-30 | 1978-10-30 | SET TO CLEAN RESPECTIVE PINK POLLUTANED CALCIUM SULPHATE INTENDED TO BE USED AS PIGMENT AND / OR FILLER |
| GB7934187A GB2032901B (en) | 1978-10-30 | 1979-10-02 | Purifying and/or bleaching calcium sulphate |
| IT50519/79A IT1128747B (en) | 1978-10-30 | 1979-10-10 | PROCEDURE FOR THE TREATMENT OF PIGMENTS OR CHARGING AGENTS, IN PARTICULAR HYDRATED PLASTER |
| FI793163A FI66416B (en) | 1978-10-30 | 1979-10-11 | SAETT ATT BEHANDLA PIGMENT |
| JP54136960A JPS5835937B2 (en) | 1978-10-30 | 1979-10-23 | Method for producing pigments or fillers |
| DE19792943205 DE2943205A1 (en) | 1978-10-30 | 1979-10-25 | PIGMENT TREATMENT METHODS |
| ES485483A ES485483A0 (en) | 1978-10-30 | 1979-10-29 | A METHOD OF PURIFYING AND RESPECTIVELY, WHITENING IMPURIFIED CALCIUM SULPHATE. |
| FR7926726A FR2440386A1 (en) | 1978-10-30 | 1979-10-29 | PROCESS FOR THE PURIFICATION AND BLEACHING OF PIGMENTS |
| CA338,625A CA1125456A (en) | 1978-10-30 | 1979-10-29 | Pigment treatment method |
| NL7907976A NL7907976A (en) | 1978-10-30 | 1979-10-30 | METHOD FOR TREATMENT OF PIGMENT. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7811216A SE417104B (en) | 1978-10-30 | 1978-10-30 | SET TO CLEAN RESPECTIVE PINK POLLUTANED CALCIUM SULPHATE INTENDED TO BE USED AS PIGMENT AND / OR FILLER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE7811216L SE7811216L (en) | 1980-05-01 |
| SE417104B true SE417104B (en) | 1981-02-23 |
Family
ID=20336216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7811216A SE417104B (en) | 1978-10-30 | 1978-10-30 | SET TO CLEAN RESPECTIVE PINK POLLUTANED CALCIUM SULPHATE INTENDED TO BE USED AS PIGMENT AND / OR FILLER |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5835937B2 (en) |
| CA (1) | CA1125456A (en) |
| DE (1) | DE2943205A1 (en) |
| ES (1) | ES485483A0 (en) |
| FI (1) | FI66416B (en) |
| FR (1) | FR2440386A1 (en) |
| GB (1) | GB2032901B (en) |
| IT (1) | IT1128747B (en) |
| NL (1) | NL7907976A (en) |
| SE (1) | SE417104B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE441457C (en) | 1978-10-30 | 1990-06-07 | Supra Ab | MAKE SUBSTITUTE SLAM FOR PREPARING FOR PAPER, CARTON AND LIKE, CONTAINING CALCIUM SULPHATE AS PIGMENT |
| FR2446256A1 (en) * | 1979-01-12 | 1980-08-08 | Azote & Prod Chim | CHEMICAL GYPSUM PURIFICATION PROCESS |
| SE469475B (en) * | 1990-10-29 | 1993-07-12 | Eka Nobel Ab | SAVED TO Pale Particles Containing Calcium Carbonate |
| BE1005164A3 (en) * | 1991-08-02 | 1993-05-11 | Prayon Rupel Technologies | Method for preparing a suspension aqueous calcium sulphate base. |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE432675C (en) * | 1924-12-25 | 1926-08-07 | Hansa Phosphat U Mineral Muehl | Process for cleaning and bleaching barite |
| DE485007C (en) * | 1926-04-04 | 1929-10-25 | Ludwig Kaiser | Process for the production of pure white and finely divided barium or calcium sulfate |
| DE491350C (en) * | 1926-12-11 | 1930-02-08 | Ludwig Kaiser | Process for the production of pure, white and finely divided barium or calcium sulfate |
| DE537392C (en) * | 1928-02-10 | 1931-11-02 | Sachtleben Akt Ges Fuer Bergba | Process for the production of a white, transparent, pure barite |
| DE586007C (en) * | 1928-06-14 | 1933-10-14 | Peter Spence & Sons Ltd | Process for the production of finely divided and anhydrous calcium sulphate as paint |
| GB339797A (en) * | 1928-12-18 | 1930-12-18 | Rene Perdu | |
| US2197003A (en) * | 1937-11-18 | 1940-04-16 | Glidden Co | Process for making pigments |
| US2522971A (en) * | 1947-04-19 | 1950-09-19 | C K William & Co | Method of bleaching barytes |
| DE1467470C2 (en) * | 1963-10-28 | 1974-06-12 | Pluess-Staufer Ag, Oftringen, Aargau (Schweiz) | Improvement of the whiteness of chalk, calcite or dolomite |
| GB1394910A (en) * | 1972-10-23 | 1975-05-21 | Pluss Stauffer Ag | Process for the optical brightening of minerals |
| JPS5147598A (en) * | 1974-10-23 | 1976-04-23 | Denki Kagaku Kogyo Kk | Tansankarushiumuno hakushokudokairyoho |
-
1978
- 1978-10-30 SE SE7811216A patent/SE417104B/en not_active IP Right Cessation
-
1979
- 1979-10-02 GB GB7934187A patent/GB2032901B/en not_active Expired
- 1979-10-10 IT IT50519/79A patent/IT1128747B/en active
- 1979-10-11 FI FI793163A patent/FI66416B/en not_active Application Discontinuation
- 1979-10-23 JP JP54136960A patent/JPS5835937B2/en not_active Expired
- 1979-10-25 DE DE19792943205 patent/DE2943205A1/en not_active Ceased
- 1979-10-29 CA CA338,625A patent/CA1125456A/en not_active Expired
- 1979-10-29 FR FR7926726A patent/FR2440386A1/en active Granted
- 1979-10-29 ES ES485483A patent/ES485483A0/en active Granted
- 1979-10-30 NL NL7907976A patent/NL7907976A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2032901A (en) | 1980-05-14 |
| JPS5835937B2 (en) | 1983-08-05 |
| FI793163A (en) | 1980-05-01 |
| IT7950519A0 (en) | 1979-10-10 |
| NL7907976A (en) | 1980-05-02 |
| FR2440386B1 (en) | 1983-07-08 |
| ES8102059A1 (en) | 1980-12-16 |
| ES485483A0 (en) | 1980-12-16 |
| JPS5560024A (en) | 1980-05-06 |
| CA1125456A (en) | 1982-06-15 |
| FR2440386A1 (en) | 1980-05-30 |
| SE7811216L (en) | 1980-05-01 |
| IT1128747B (en) | 1986-06-04 |
| FI66416B (en) | 1984-06-29 |
| GB2032901B (en) | 1982-11-03 |
| DE2943205A1 (en) | 1980-05-08 |
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