SE426181B - Process for removing dispersed or suspended particles from a slurry by means of flocculation - Google Patents
Process for removing dispersed or suspended particles from a slurry by means of flocculationInfo
- Publication number
- SE426181B SE426181B SE8100634A SE8100634A SE426181B SE 426181 B SE426181 B SE 426181B SE 8100634 A SE8100634 A SE 8100634A SE 8100634 A SE8100634 A SE 8100634A SE 426181 B SE426181 B SE 426181B
- Authority
- SE
- Sweden
- Prior art keywords
- tannin
- slurry
- flocculation
- lignin
- oxide
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002002 slurry Substances 0.000 title claims abstract description 9
- 238000005189 flocculation Methods 0.000 title claims abstract description 8
- 230000016615 flocculation Effects 0.000 title claims abstract description 8
- 239000002245 particle Substances 0.000 title claims abstract description 7
- 229920001864 tannin Polymers 0.000 claims abstract description 20
- 239000001648 tannin Substances 0.000 claims abstract description 20
- 235000018553 tannin Nutrition 0.000 claims abstract description 20
- 229920005610 lignin Polymers 0.000 claims abstract description 14
- 229920000233 poly(alkylene oxides) Polymers 0.000 claims abstract description 14
- 230000002195 synergetic effect Effects 0.000 claims abstract description 4
- 239000000725 suspension Substances 0.000 claims abstract description 3
- 229920002401 polyacrylamide Polymers 0.000 claims abstract 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 13
- 230000014759 maintenance of location Effects 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 4
- 229920001131 Pulp (paper) Polymers 0.000 claims description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims 1
- 229920001451 polypropylene glycol Polymers 0.000 claims 1
- 229920000642 polymer Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920000168 Microcrystalline cellulose Polymers 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 ethylene, propylene groups Chemical group 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 229920005611 kraft lignin Polymers 0.000 description 1
- 150000002605 large molecules Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 235000019813 microcrystalline cellulose Nutrition 0.000 description 1
- 239000008108 microcrystalline cellulose Substances 0.000 description 1
- 229940016286 microcrystalline cellulose Drugs 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
- D21F1/82—Pulp catching, de-watering, or recovering; Re-use of pulp-water adding fibre agglomeration compositions
Landscapes
- Paper (AREA)
Abstract
Description
15 20 25 30 35 8100634-8 2 Denna behandling kan bestå i att man till uppslam- ningen eller processvatten doserar lämpliga mängder tannin eller lignin och polyalkylenoxid (PAO) eller om tannin och/eller lignin redan finns närvarande i lämpliga halter endast PAO. 15 20 25 30 35 8100634-8 2 This treatment may consist of dosing appropriate amounts of tannin or lignin and polyalkylene oxide (PAO) into the slurry or process water or if tannin and / or lignin are already present in suitable levels only PAO.
Det har nämligen överraskande visat sig, att man erhåller en synergistisk effekt när både polyalkylenoxid och tannin eller lignin finns närvarande samtidigt. Man erhåller en betydligt bättre utflockning än vid användning av enbart polymer(PAO) eller högmolekylär förening (tannin, lignin). Tannin i frånvaro av polymer synes ej bidra till flockbildning. Det har även visat sig att föreliggande behandling ger bättre effekt vid närvaro av aluminiumsalter.Namely, it has surprisingly been found that a synergistic effect is obtained when both polyalkylene oxide and tannin or lignin are present at the same time. A much better flocculation is obtained than when using only polymer (PAO) or high molecular weight compound (tannin, lignin). Tannin in the absence of polymer does not appear to contribute to flocculation. It has also been found that the present treatment gives a better effect in the presence of aluminum salts.
Vanligt vattenledningsvatten har oftast tillräckligt stor total aluminiumhalt.Ordinary tap water usually has a sufficiently large total aluminum content.
Förhållandet (vikt) mellan PAO å nin eller lignin å andra sidan är ej kritiskt och kan vari- ena sidan och tan- era inom vida gränser, t.ex. från 1:50 till 50:1. Ett föredraget intervall är från 1:10 till 10:1. Fackmannen kan lätt utprova det för den speciella uppslamningen lämpliga förhållandet. _ Det enligt uppfinningen närvarande polymeren (PAO) har en molekylvikt av lägst 50 000 och är vattenlös- lig i åtminstone den aktuella halten. De föredragna poly- mererna (PAO) har en medelmolekylvikt av 200 000 till 15 000 000.The ratio (weight) between PAO on the one hand or lignin on the other hand is not critical and can vary and vary within wide limits, e.g. from 1:50 to 50: 1. A preferred range is from 1:10 to 10: 1. Those skilled in the art can easily test the ratio suitable for the particular slurry. The polymer (PAO) present according to the invention has a molecular weight of at least 50,000 and is water-soluble in at least the actual content. The preferred polymers (PAO) have an average molecular weight of 200,000 to 15,000,000.
Polyalkylenoxidens kolvätegrupper innehåller före- trädesvis 2 - 4 kolatomer och speciellt föredragna är etylen-, propylengrupper och etylen/propylengrupper.The hydrocarbon groups of the polyalkylene oxide preferably contain 2 to 4 carbon atoms and especially preferred are ethylene, propylene groups and ethylene / propylene groups.
Lämpliga källor för lignin är avlut från sulfat-, sulfit- eller halvkemisk massaframställning. Tannin av olika ursprung är lämpligt. I vissa fall, när man inom skogsindustrin har vâtbarkningsanläggningar och sätter bakvattnet från dessa till mäld, kan man utnyttja tanninet, som extraherats ur barken.Suitable sources of lignin are effluents from sulphate, sulphite or semi-chemical pulps. Tannin of different origins is suitable. In some cases, when the forest industry has wet barking plants and puts the backwater from these to stock, you can use the tannin, which is extracted from the bark.
De använda halterna av PAO och tannin eller lignin är av kostnadsskäl vanligen mindre än 1 kg/ton mäld. 10 15 20 25 30 35 8100634-8 3 Verkningsgraden för retention enligt uppfinningen är pH-beroende. Man har ett optimum vid svagt surt pH, app- roximativt vid pH 5. Företrädesvis ligger mäldens pH-värde mellan 3 och 8.The levels of PAO and tannin or lignin used are usually less than 1 kg / tonne of stock for cost reasons. 10 15 20 25 30 35 8100634-8 3 The efficiency of retention according to the invention is pH dependent. You have an optimum at slightly acidic pH, approximately at pH 5. Preferably, the stock's pH value is between 3 and 8.
Föreliggande uppfinning belyses av de följande ej begränsande exemplen. Försöken utfördes vid ett pH av ca 5 och vid rumstemperatur, såvida ej annat anges.The present invention is illustrated by the following non-limiting examples. The experiments were performed at a pH of about 5 and at room temperature, unless otherwise stated.
Exempel 1 Den följande tabellen visar totalretention och harts- retention vid olika halter polyetylenoxid med en medelmolekyl- vikt av ca H 000 000 och tannin. Försöket utfördes med en inloppslådemäld med en fiberhalt av 8,0 g/l i en försöks- apparat (Britt Dynamic Jar).Example 1 The following table shows total retention and resin retention at different levels of polyethylene oxide with an average molecular weight of about H 000 000 and tannin. The test was performed with an inlet box stock with a fiber content of 8.0 g / l in a test device (Britt Dynamic Jar).
Tabell I PEO* Tannin Totalretention Hartsretention g/ton g/ton % % 0 O 61 U 125 0 57 23 125 125 66 36 250 Ü 72 29 250 250 78 62 500 Û 80 62 500 500 87 77 * PEO = polyetylenoxid Man bör lägga märke till den kraftigt ökade harts- retentionen, förutom totalretentionen. flxempel 2 Slipmassa av massakoncentration av 4.g/l under- söktes i en Schopper-Rieglerapparat (SCAN-C 19:65, Scandi- navian pulp, paper and board testing committee) med ett något modifierat förfarande. Sidoutloppet av apparaten till- slöts med en propp och man mätte en "relativ avvattningstid", T definierad som X xx Avvattningstid -Avvattningstid T = 1- _ Avvattningstidx-Avvattningstidxxx x = massa utan tillsatser xx = massa med tillsatser xxx med vatten 8100654-8 10 15 20 25 30 35 4 Denna tid T mättes som funktion av doserad mängd PEO (mg/l) vid olika halter doserad tannin: Den använda polyetylenoxiden hade en molekylvikt av ca 3 106. Av tabell II framgår, att tannin kraftigt minskar den relativa genomrinningstiden.Table I PEO * Tannin Total retention Resin retention g / ton g / ton%% 0 O 61 U 125 0 57 23 125 125 66 36 250 Ü 72 29 250 250 78 62 500 Û 80 62 500 500 87 77 * PEO = polyethylene oxide You should add notice the sharply increased resin retention, in addition to the total retention. 2 Example 2 Abrasive mass of 4.g / l mass concentration was examined in a Schopper-Riegler apparatus (SCAN-C 19:65, Scandinavian pulp, paper and board testing committee) with a slightly modified procedure. The side outlet of the appliance was closed with a plug and a "relative dewatering time" was measured, T defined as X xx Dewatering time -D Draining time T = 1- _ Dewatering timex-Dewatering timexxx x = mass without additives xx = mass with additives xxx with water 8100654-8 10 15 20 25 30 35 4 This time T was measured as a function of dosed amount of PEO (mg / l) at different levels of dosed tannin: The polyethylene oxide used had a molecular weight of about 3 106. Table II shows that tannin greatly reduces the relative throughput time.
Detta betyder att de små i massasuspensionen närvarande partiklarna i långt mindre grad sätter igen.de av massafibrernaï bildade kanalerna vid tillsats av PEO och tannin.This means that the small particles present in the pulp suspension to a much lesser extent clog the channels formed by the pulp fibers when PEO and tannin are added.
Tabell II PEO Tannin Relativ av- PEO Tannín Relativ avvatt- mg/l mg/l vattnångstid mg/1 mg/l ningâtid 0,025 0 0,98 0,025 2 0,85 0,2 0 0,92 0,2 2 0,U3 0,5 0 0,90 0,5 2 0,35 2 0 0,86 2 2 0,22 Exemgel 3 Exempel 2 upprepades med användning av en halvkemisk massa. Massahalten var 5 g/1.Table II PEO Tannin Relative de- PEO Tannin Relative dewatering mg / l mg / l water shortage time mg / 1 mg / l watering time 0.025 0 0.98 0.025 2 0.85 0.2 0 0.92 0.2 2 0, U3 0.5 0 0.90 0.5 2 0.35 2 0 0.86 2 2 0.22 Example Gel 3 Example 2 was repeated using a semi-chemical mass. The mass content was 5 g / l.
Tabell III PEO Tannín Relativ av- mg/l mg/1 vattnângstíd 0,1 0,99 , 0,91 , 0,76 0,1 10 0,97 1,0 10 0,63 2,0 10 0,28 Exemgel 4.Table III PEO Tannin Relative av- mg / l mg / 1 water vapor time 0.1 0.99, 0.91, 0.76 0.1 10 0.97 1.0 10 0.63 2.0 10 0.28 Example gel 4.
I detta exempel användes en blekt sulfatmassa med massahalten 1 g/l, Massan var omald och hade avkryllats, d.v.s. befriats från små fibrer. Till denna massa hade satts mikrokristallin cellulosa med medelpartikelstorleken 17 um i olika halter. I tabell IV återges värden på grumlighet efter filtrering över en vira (relativ skala och mätt genom ljusspridning) som funktion av doserad mängd PEO (molekyl- vikt 3 000 000) och tannin. Utfällningen är ögonblicklig och 10 15 20 25 30 8100634-8 5 mätningen utfördes 10 minuter efter tillsatsen. Av tabellen framgår att redan vid en doserad mängd av 1 mg/l tannin och 1 mg/l PEO grumligheten har en låg nivå.In this example a bleached sulphate pulp with a pulp content of 1 g / l was used. The pulp was unpainted and had been curled, i.e. freed from small fibers. To this mass had been added microcrystalline cellulose with an average particle size of 17 μm in different contents. Table IV shows values of turbidity after filtration over a virus (relative scale and measured by light scattering) as a function of dosed amount of PEO (molecular weight 3,000,000) and tannin. The precipitation is instantaneous and the measurement was performed 10 minutes after the addition. The table shows that even at a dosed amount of 1 mg / l tannin and 1 mg / l PEO the turbidity has a low level.
Tabell_l! PEO Tannin Mikrokristallin Relativ grumlighet mg/l mg/1 cellulosa mg/l 0 0 30 13 0 0 60 26 0 0 120 58 1 1 30 6 1 1 60 9 1 1 120 12 5 5 30 9 5 5 60 9 5 5 120 6 Éšemgel 5 I detta exempel visas den synergístiska verkningen vid användning av PEO och lignin. Den använda polyetylen- oxiden var samma som i exemplen 2 och 3 och ligninet var ett kraftlignín. Den relativa tiden är definierad i exempel 2.Table_l! PEO Tannin Microcrystalline Relative turbidity mg / l mg / 1 cellulose mg / l 0 0 30 13 0 0 60 26 0 0 120 58 1 1 30 6 1 1 60 9 1 1 120 12 5 5 30 9 5 5 60 9 5 5 120 This example shows the synergistic effect of using PEO and lignin. The polyethylene oxide used was the same as in Examples 2 and 3 and the lignin was a kraft lignin. The relative time is defined in Example 2.
I försöket användes blekt sulfatmassa av 480 SR (Schopper-Riegler). Massakoncentrationen var 10 g/l, pH 7,8.In the experiment, bleached sulphate pulp of 480 SR (Schopper-Riegler) was used. The mass concentration was 10 g / l, pH 7.8.
Försöket utfördes på samma sätt som i exemplen 2 och 3.The experiment was performed in the same manner as in Examples 2 and 3.
Tabell V återger resultaten.Table V presents the results.
Tabell V PEO Lignin Relativ avvattningstid mg/1 mg/l T 10 0 0,98 5 5 0,90 5 10 0,68 10 10 0,65 5 50 0,56 Förfarandet är avsett att användas vid framställning av papper, främst vid kvaliteter med höga halter lösta oorganiska och organiska substanser.Table V PEO Lignin Relative dewatering time mg / 1 mg / l T 10 0 0.98 5 5 0.90 5 10 0.68 10 10 0.65 5 50 0.56 The process is intended for use in the production of paper, mainly in qualities with high levels of dissolved inorganic and organic substances.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8100634A SE426181B (en) | 1981-01-29 | 1981-01-29 | Process for removing dispersed or suspended particles from a slurry by means of flocculation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8100634A SE426181B (en) | 1981-01-29 | 1981-01-29 | Process for removing dispersed or suspended particles from a slurry by means of flocculation |
Publications (2)
Publication Number | Publication Date |
---|---|
SE8100634L SE8100634L (en) | 1982-07-30 |
SE426181B true SE426181B (en) | 1982-12-13 |
Family
ID=20343016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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SE8100634A SE426181B (en) | 1981-01-29 | 1981-01-29 | Process for removing dispersed or suspended particles from a slurry by means of flocculation |
Country Status (1)
Country | Link |
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SE (1) | SE426181B (en) |
-
1981
- 1981-01-29 SE SE8100634A patent/SE426181B/en unknown
Also Published As
Publication number | Publication date |
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SE8100634L (en) | 1982-07-30 |
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