NO339659B1 - Refractory heat-curing mass for the manufacture of wear linings in tundishes, backfills in ladles and other equivalent applications - Google Patents
Refractory heat-curing mass for the manufacture of wear linings in tundishes, backfills in ladles and other equivalent applications Download PDFInfo
- Publication number
- NO339659B1 NO339659B1 NO20120757A NO20120757A NO339659B1 NO 339659 B1 NO339659 B1 NO 339659B1 NO 20120757 A NO20120757 A NO 20120757A NO 20120757 A NO20120757 A NO 20120757A NO 339659 B1 NO339659 B1 NO 339659B1
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- Prior art keywords
- mass
- tundish
- wear
- water glass
- binder
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- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000013007 heat curing Methods 0.000 title description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 28
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 26
- 239000011230 binding agent Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000013078 crystal Substances 0.000 claims description 19
- 239000011819 refractory material Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000010450 olivine Substances 0.000 claims description 7
- 229910052609 olivine Inorganic materials 0.000 claims description 7
- 239000011236 particulate material Substances 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical compound SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims 1
- 239000000428 dust Substances 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000000391 magnesium silicate Substances 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 235000012243 magnesium silicates Nutrition 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000008821 health effect Effects 0.000 description 1
- 230000005802 health problem Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 150000004690 nonahydrates Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229910052611 pyroxene Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/10—Monolithic linings; Supports therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Ceramic Products (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
ILDFAST VARMTHERDENDE MASSE FOR FREMSTILLING AV SLITEFORINGERI TUNDISHER, BAKFYLLINGERI ØSER OG ANDRE EKVIVALENTE ANVENDELSER REFRACTORY HEAT-CURING COMPOUND FOR THE MANUFACTURE OF WEAR LINING IN TUNDISHERS, BACK FILLING BUCKETS AND OTHER EQUIVALENT USES
Oppfinnelsens område Field of the invention
Den foreliggende oppfinnelse vedrører utstøping av stål eller annet metall, særlig kontinuerlig utstøping og spesielt såkalt strengstøping. Nærmere bestemt vedrører oppfinnelsen en masse for fremstilling av sliteforinger i tundisher, bakfyllinger i øser og andre ekvivalente anvendelser. The present invention relates to the casting of steel or other metal, in particular continuous casting and in particular so-called string casting. More specifically, the invention relates to a mass for the production of wear liners in tundishes, backfills in ladles and other equivalent applications.
Oppfinnelsen bakfirunn or kjent teknikk The invention is behind the prior art
Ved strengstøping anvendes en tundish, også kalt en mellomtrakt, mellom øse og form for å hindre at slagg følger med smeiten til formen, for å styre støpehastighet og for å kunne støpe ut i flere strenger samtidig. In strand casting, a tundish, also called an intermediate funnel, is used between the ladle and the mold to prevent slag from following the melt into the mold, to control the casting speed and to be able to cast out in several strands at the same time.
På grunn av den kontinuerlige eksponeringen for smelte og slagg ved ca. 1550 °C er sliteforingen i tundishen svært utsatt for nedbrytning og slitasje. En vanlig sandform til stykkstøping blir utsatt for kun flytende smelte, ikke mer aggressiv slagg, og kun i få sekunder før smeiten begynner å størkne og danner et beskyttende sjikt mot formen. Krav til ildfasthet, bindemidler, isolasjonsevne og fasthet blir annerledes og langt mer krevende for en tundish enn for en engangsform for stykkgodsstøping. Due to the continuous exposure to melt and slag at approx. 1550 °C, the wear liner in the tundish is very susceptible to breakdown and wear. A normal sand mold for piece casting is only exposed to liquid melt, not more aggressive slag, and only for a few seconds before the melt begins to solidify and form a protective layer against the mold. Requirements for refractoriness, binders, insulating ability and firmness are different and far more demanding for a tundish than for a one-off mold for piece casting.
Det er vanlig praksis å utstyre tundisher med en sliteforing. Etter typisk 4 til 24 timers kontinuerlig drift er sliteforingen utslitt og må erstattes. It is common practice to equip tundishes with a wear liner. After typically 4 to 24 hours of continuous operation, the wear liner is worn out and must be replaced.
Tradisjonell sliteforing i tundish består enten av en slurrybasert masse som påsprøytes tundishveggen, eller en tørrmasse som drysses på plass mellom bakforingen i tundishen og en indre form (sjablon). Tradisjonell tørrmasse, har tidligere gjerne vært basert på et partikulært ildfastmateriale blandet med fenolharpiksbaserte bindemidler. Dette er ikke en akseptabel løsning i dag på grunn av avdamping av helseskadelige gasser. Senere bindemidler omfatter organiske stoffer slik som sitronsyre eller sukker eller uorganiske stoffer slik som bittersalt. Bindemidlene nevnt ovenfor har enten negative helsemessige effekter ved oppvarming eller gir for dårlig fasthet i visse temperaturområder. Traditional wear lining in the tundish consists of either a slurry-based mass that is sprayed onto the tundish wall, or a dry mass that is sprinkled in place between the back lining in the tundish and an internal form (template). Traditional dry mass has previously often been based on a particulate refractory material mixed with phenolic resin-based binders. This is not an acceptable solution today due to the evaporation of harmful gases. Later binders include organic substances such as citric acid or sugar or inorganic substances such as bitter salt. The binders mentioned above either have negative health effects when heated or give poor firmness in certain temperature ranges.
En stor forbedring av masser og metoder for sliteforinger i tundisher, ble tilveiebrakt med søkerens patenterte fremgangsmåte og sliteforing hvor bindemidlet omfatter vannglass og ester. For en detaljert beskrivelse derav henvises det til patent publikasjonene NO 331 214/ SE 529 274 eller andre patenter i samme familie. Helsefarlige gasser avdampes ikke fra bindemidlet omfattende vannglass og ester, derved unngås helseproblemene og blandingen krever enklere blanding og håndtering enn tidligere masser, slik at blanding og levering kan finne sted i ett trinn i en skruemater eller tilsvarende. Både arbeidsmiljø og arbeidsflyt ble derved vesentlig forbedret. A major improvement of masses and methods for wear linings in tundishes was provided with the applicant's patented method and wear lining where the binder comprises water glass and ester. For a detailed description thereof, reference is made to the patent publications NO 331 214/ SE 529 274 or other patents in the same family. Gases hazardous to health are not evaporated from the binder, which includes water glass and ester, thereby avoiding the health problems and the mixture requires easier mixing and handling than previous masses, so that mixing and delivery can take place in one step in a screw feeder or similar. Both the working environment and workflow were thereby significantly improved.
Men likevel må det utføres en relativt nøyaktig dosering og blanding av flere bestanddeler, hvilket betyr investeringer i utstyr og arbeidsoperasjoner for å dosere og blande bestanddelene. Det er derfor ønskelig å tilveiebringe en masse for sliteforing i tundish som er enda mer fordelaktig, og siktemålet med oppfinnelsen er å tilveiebringe slik masse. But still, a relatively accurate dosing and mixing of several components must be carried out, which means investments in equipment and work operations to dose and mix the components. It is therefore desirable to provide a mass for wear lining in tundish which is even more advantageous, and the aim of the invention is to provide such mass.
Oppsummering av oppfinnelsen Summary of the invention
Oppfinnelsen tilveiebringer en masse for fremstilling av sliteforing i tundish, bakfylling (hulrom mellom sliteforing og bakforing) i øser og andre ekvivalente anvendelser, omfattende ildfast partikulært materiale og et bindemiddel, og særpreget ved at massen er basert på olivin eller olivinrik bergart og bindemidlet består av tørt pulverformig vannglass med krystallvann i en mengde på 2,5 - 3,5 vekt %, regnet på hele blandingen. The invention provides a mass for the production of wear liners in tundish, backfill (cavity between wear liner and back liner) in ladles and other equivalent applications, comprising refractory particulate material and a binder, and characterized by the fact that the mass is based on olivine or olivine-rich rock and the binder consists of dry powdered water glass with crystal water in an amount of 2.5 - 3.5% by weight, calculated on the whole mixture.
Bindemidlet aktiveres ved oppvarming fra tundishens eller øsens restvarme eller fra annen varmekilde, idet oppvarmingen frigir bundet krystallvann. Massen er tørr og avgir ikke skadelige gasser ved oppvarming. The binder is activated by heating from the residual heat of the tundish or ladle or from another heat source, as the heating releases bound crystal water. The pulp is dry and does not emit harmful gases when heated.
Massen er fordelaktig ferdigblandet slik at verket får levert ferdigblandet en-komponent masse, utstyr for dosering og blanding er derved unødvendig. Men massen kan alternativt blandes på stedet eller under fremføring mellom sjablon/innerform og tundish eller øse, dette kan særlig være et alternativ for verk som har tilgang til nødvendig utstyr for dosering og blanding. The mass is advantageously pre-mixed so that the plant receives pre-mixed one-component mass, equipment for dosing and mixing is therefore unnecessary. But the mass can alternatively be mixed on the spot or during transfer between the template/inner form and the tundish or ladle, this can be an alternative for works that have access to the necessary equipment for dosing and mixing.
Uten ønske om å være bundet til teori, antas det at frigivelse og avdamping av vann, under oppvarming, gjør vannglasset mykt eller flytende slik at det hefter seg til kornpartiklene og senere størkner til en fast konsistens. Testing underbygger et slikt syn, og indikerer at krystallvannholdig vannglass er anvendbart generelt. Mekanismen for binding og herding er imidlertid ikke forstått helt ennå, det kan tenkes at det foreligger reaksjoner mellom bestanddelene, hvorved det bør foreligge et støkiometrisk hensiktsmessig forhold mellom krystallvann og vannglass. Blandingsforholdet mellom krystallvannholdig vannglass og partikulært ildfast materiale må være slik at mengden bindemiddel gir tilstrekkelig mekanisk styrke. Overskudd av vannglass er generelt ikke ønskelig ettersom høyt alkaliinnhold vil redusere ildfastheten. Without wishing to be bound by theory, it is believed that the release and evaporation of water, during heating, softens or liquefies the water glass so that it adheres to the grain particles and later solidifies into a solid consistency. Testing supports such a view, and indicates that crystalline water-containing water glass is applicable in general. However, the mechanism for binding and hardening is not yet fully understood, it is conceivable that there are reactions between the components, whereby there should be a stoichiometrically appropriate ratio between crystal water and water glass. The mixing ratio between crystalline aqueous water glass and particulate refractory material must be such that the amount of binder provides sufficient mechanical strength. An excess of water glass is generally not desirable as a high alkali content will reduce refractoriness.
Massen inneholder ikke bindemiddel som avgir giftige gasser ved oppvarming. Tester har vist at massen beholder god fasthet og ildfasthet mot smelte og slagg over hele det aktuelle temperaturområdet for en tundish, lagringsevnen er god slik at en beholder med ferdigblandet masse kan stå utildekket over en helg uten dannelse av for mye skorpe, betydelig lenger, typisk over 14 dager, ved tildekking av åpnet beholder. Massen renner lett ut av silo eller beholder, den støver lite og massen kan leveres på stedet fra en bunntømmingsbag eller -silo løftet i kran, hensiktsmessig med en slange ned til tundishen. Massen fester seg lite til sjablonen (innerformen i tundish), derfor kan sjablonen fjernes uten at masse følger med, slik at reparasjon av således skadde områder i tundish unngås og smøring av sjablonen med et slippmiddel ikke er påkrevd. Slippmiddel kan imidlertid anvendes dersom overflaten av sjablonen fester seg til massen. The pulp does not contain a binder that emits toxic gases when heated. Tests have shown that the mass retains good firmness and refractoriness against melt and slag over the entire relevant temperature range for a tundish, the storage capacity is good so that a container with pre-mixed mass can be left uncovered for a weekend without the formation of too much crust, significantly longer, typically over 14 days, by covering the opened container. The pulp flows easily out of the silo or container, it creates little dust and the pulp can be delivered on site from a bottom emptying bag or silo lifted by crane, suitably with a hose down to the tundish. The mass does not stick to the template (the inner shape in the tundish), therefore the template can be removed without the mass coming with it, so that repair of thus damaged areas in the tundish is avoided and lubrication of the template with a release agent is not required. However, a release agent can be used if the surface of the template sticks to the mass.
Massen omfatter 2,5-3,5 vekt %, enda mer fordelaktig ca 3 vekt % vannglass med krystallvann, regnet på hele blandingen. The mass comprises 2.5-3.5% by weight, even more advantageously about 3% by weight of water glass with crystal water, calculated on the entire mixture.
Vannglasset er fordelaktig av typen natrium metasilikat pentahydrat (sodium metasilicate pentahydrate) pulver, det vil si Si0228,5 vekt % (AC01), Na20 28,7 vekt % (AC01), glødetap 43 vekt % (AC35), mindre mengder resterende materiale og bulktetthet 700 g/l. Vannglasset har fordelaktig en partikkelstørrelsesfordeling (AC 27) hvor partikler >250 um utgjør 25 vekt %, 250-63 um 45 vekt % og <63 um 30 vekt %, og med midlere partikkelstørrelse 90 um (AC 27). Alternative krystallvannhoIdige natronvannglass kan benyttes, slik som nonahydrat med 9 krystallvann eller andre, men partikkelstørrelsesfordelingen bør være således at det også foreligger mel-lignende materiale, det vil si liknende finpartikulær partikkelstørrelsesfordeling som angivelsen ovenfor. Krystallvannandelen synes som sagt å kunne varieres svært bredt, men passende krystallvanninhold er ca. 50 vekt %, slik som 30-70 vekt %, hvilket finnes ved å måle glødetap (Loi). Kalivannglass med krystallvann kan også være et alternativ. The water glass is advantageously of the sodium metasilicate pentahydrate powder type, i.e. Si0228.5 wt% (AC01), Na20 28.7 wt% (AC01), loss on ignition 43 wt% (AC35), smaller amounts of residual material and bulk density 700 g/l. The water glass advantageously has a particle size distribution (AC 27) where particles >250 µm make up 25% by weight, 250-63 µm 45% by weight and <63 µm 30% by weight, and with an average particle size of 90 µm (AC 27). Alternative soda water glasses containing crystal water can be used, such as nonahydrate with 9 crystal water or others, but the particle size distribution should be such that there is also flour-like material, i.e. a similar fine particulate particle size distribution as stated above. As said, the proportion of crystal water seems to be able to be varied very widely, but a suitable crystal water content is approx. 50% by weight, such as 30-70% by weight, which is found by measuring loss on ignition (Loi). Potassium water glasses with crystal water can also be an alternative.
Det ildfaste materialet er basert på olivin men kan også inneholde andre ildfaste magnesiumsilikater som f. eks serpentin, talk, pyroksener etc. samt bergarter som inneholder høy andel av magnesiumsilikater. Magnesiumsilikatmineralene kan helt eller delvis erstattes med dødbrent MgO, spinelol,alumina eller annet partikulært ildfastmateriale med egnet kornstørrelse og kornstørrelsefordeling. The refractory material is based on olivine but can also contain other refractory magnesium silicates such as serpentine, talc, pyroxenes etc. as well as rocks that contain a high proportion of magnesium silicates. The magnesium silicate minerals can be completely or partially replaced with dead burnt MgO, spinel, alumina or other particulate refractory material with a suitable grain size and grain size distribution.
Massen omfatter med fordel en støvbinder, i mengde på 0,1-1 vekt %, fortrinnsvis ca 0,3 vekt %, for å hindre støving av melaktig vannglass. Støvbinderen er mest fordelaktig ved anvendelse av meget finfordelt vannglass i massen, men kan sløyfes ved mer grovkornet vannglass. Støvbinderen er hensiktsmessig en av flere kommersielt tilgjengelige støvbindere omfattende polyetylenglykol og eventuelle organiske oljer slik som glyserol, eller ren polyetylenglykol. For høyt innhold bør unngås fordi dette gjør massen seig og mindre flytbar. The mass advantageously comprises a dust binder, in an amount of 0.1-1% by weight, preferably about 0.3% by weight, to prevent dusting of milky water glass. The dust binder is most advantageous when using very finely divided water glass in the mass, but can be omitted when more coarse-grained water glass is used. The dust binder is suitably one of several commercially available dust binders comprising polyethylene glycol and any organic oils such as glycerol, or pure polyethylene glycol. Too high a content should be avoided because this makes the mass tough and less flowable.
Oppfinnelsen tilveiebringer også en tundish, særpreget ved at den har en sliteforing fremstilt av en masse ifølge oppfinnelsen. Sliteforingen er med fordel herdet ved hjelp av restvarme fra tundishen, idet restvarmen frigjør krystallvann og aktiverer bindemidlet. The invention also provides a tundish, characterized in that it has a wear lining produced from a mass according to the invention. The wear liner is advantageously hardened using residual heat from the tundish, as the residual heat releases crystal water and activates the binder.
Likeledes tilveiebringer oppfinnelsen en øse med bakfyllingsforing, og/eller sliteforing, av masse ifølge oppfinnelsen. En øse eksponeres for smelte og slagg ved ca 1650 °C, altså litt varmere enn de ca. 1550 °C en tundish eksponeres for, dette betyr at andelen finstoff i det partikulære ildfaste materialet med fordel kan økes, for å øke tetthet og ildfasthet, innhold av MgO kan økes for å øke ildfastheten, og det bør ikke anvendes overskudd av vannglass, for ikke å forringe ildfastheten ved forhøyet innhold av kvarts, men økt finstoffandel i det partikulære ildfaste materialet krever mer vannglass. Den optimale sammensetning av massen vil følgelig være forskjellig fra optimal masse for tundish, men som for tundish vil et bredt spekter av sammensetninger være anvendbare. Likewise, the invention provides a ladle with back filling lining, and/or wear lining, made of pulp according to the invention. A ladle is exposed to melt and slag at approx. 1650 °C, i.e. slightly hotter than the approx. 1550 °C a tundish is exposed to, this means that the proportion of fines in the particulate refractory material can be advantageously increased, in order to increase density and refractoriness, the content of MgO can be increased to increase refractoriness, and an excess of water glass should not be used, for not to impair the refractoriness due to an increased content of quartz, but an increased proportion of fines in the particulate refractory material requires more water glass. The optimum composition of the mass will therefore be different from the optimum mass for tundish, but as for tundish, a wide range of compositions will be applicable.
Oppfinnelsen tilveiebringer også en fremgangsmåte for fremstilling av en sliteforing i en tundish, særpreget ved å tilføre en masse i henhold til oppfinnelsen på stedet hvor sliteforingen skal dannes, idet massen er ferdigblandet, eventuelt blir massen blandet på stedet eller under tilførselen, og å varme opp massen som ferdig plassert for således å aktivere bindemidlet ved å frigjøre krystallvann. Varmingen er fordelaktig ved hjelp av gjenværende restvarme i tundishen, eventuelt ved hjelp av eller understøttet av varming med en ekstern varmeinnretning. Varmingen er med fordel ved temperatur 150- 350 °C, mest fordelaktig over 200 °C. Temperatur og tid virker sammen. Dette betyr at for å kunne anvende utelukkende restvarme fra tundishen, bør massen være på plass i god tid før tundishen etter drift avkjøles til 200 °C. The invention also provides a method for producing a wear lining in a tundish, characterized by supplying a mass according to the invention at the place where the wear lining is to be formed, the mass being pre-mixed, optionally the mass is mixed on site or during the supply, and heating the mass as already placed to thus activate the binder by releasing crystal water. The heating is advantageous with the help of residual heat in the tundish, possibly with the help of or supported by heating with an external heating device. The heating is advantageously at a temperature of 150-350 °C, most advantageously above 200 °C. Temperature and time work together. This means that in order to be able to use only residual heat from the tundish, the mass should be in place well before the tundish cools down to 200 °C after operation.
Oppfinnelsen tilveiebringer også anvendelse av masse ifølge oppfinnelsen, for fremstilling av en sliteforing i en tundish. The invention also provides the use of pulp according to the invention, for the production of a wear lining in a tundish.
Videre tilveiebringer oppfinnelsen anvendelse av masse ifølge oppfinnelsen, for fremstilling av bakfyllinger og/eller sliteforinger i øser, og andre ekvivalente anvendelser Furthermore, the invention provides the use of pulp according to the invention, for the production of backfills and/or wear liners in ladles, and other equivalent applications
Detaljert beskrivelse Detailed description
Det partikulære ildfaste materialet kan ha nær uendelig mange mulige sammensetninger gitt at det har tilstrekkelig ildfasthet og egnet kornstørrelsesfordeling for herding når det krystallvannhoIdige vannglass varmes opp og derved frigjør vannet. Generelt vil alle ildfaste partikulære materialblandinger som anvendes for sliteforinger i tundisher være anvendbare i sammenheng med tundisher. Dette betyr at mengden dødbrent MgO, eventuelt med innhold av regenerert MgO, kan anvendes for å styre de ildfaste egenskaper generelt, idet høyere innhold av Mgo gir høyere ildfasthet. De ytterligere partikulære ildfaste materialer er fortrinnsvis blant dem som er nevnt tidligere men også andre materialer kan være egnet. Videre er det normalt et vesentlig innhold av finstoff, det vil si finoppdelt partikulært materiale, hvilket er viktig for god herding og for styring av de isolerende egenskaper, idet økt andel finstoff øker ildfastheten men krever mer bindemiddel. Det er generelt anbefalt å ha en samsvarighet i kornstørrelsesfordeling for finstoffet mellom det partikulære ildfaste materialet og vannglass, slik at det foreligger omtrent like mye finpartikulært ildfast materiale som finpartikulært vannglass med krystallvann, ettersom dette fremmer herdeevnen. Dersom materialene er grovere kan vannglassinnholdet senkes, og motsatt. The particulate refractory material can have an almost infinite number of possible compositions provided that it has sufficient refractoriness and a suitable grain size distribution for hardening when the crystal water-containing water glass is heated and thereby releases the water. In general, all refractory particulate material mixtures used for wear linings in tundishes will be applicable in connection with tundishes. This means that the amount of dead burnt MgO, possibly with a content of regenerated MgO, can be used to control the refractory properties in general, as a higher content of MgO gives higher refractoriness. The further particulate refractory materials are preferably among those mentioned earlier, but other materials may also be suitable. Furthermore, there is normally a significant content of fine matter, that is finely divided particulate material, which is important for good curing and for controlling the insulating properties, as an increased proportion of fine matter increases fire resistance but requires more binder. It is generally recommended to have a match in grain size distribution for the fine matter between the particulate refractory material and water glass, so that there is approximately the same amount of fine particulate refractory material as fine particulate water glass with crystal water, as this promotes the hardening ability. If the materials are coarser, the water glass content can be lowered, and vice versa.
Støvbinder anvendes med fordel dersom det foreligger støving av vannglasset, ettersom dette kan være irriterende for huden. Type og mengde er som nevnt ovenfor. Dust binder is advantageously used if there is dust on the water glass, as this can be irritating to the skin. Type and quantity are as mentioned above.
Temperatur for herding bør fortrinnsvis være ca 200-350 °C, mer foretrukket ca. 200-250 °C, men også temperaturer utenfor nevnte intervaller kan anvendes. Temperature for curing should preferably be approx. 200-350 °C, more preferably approx. 200-250 °C, but also temperatures outside the mentioned intervals can be used.
Claims (12)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20120757A NO339659B1 (en) | 2012-06-29 | 2012-06-29 | Refractory heat-curing mass for the manufacture of wear linings in tundishes, backfills in ladles and other equivalent applications |
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| Application Number | Priority Date | Filing Date | Title |
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| NO20120757A NO339659B1 (en) | 2012-06-29 | 2012-06-29 | Refractory heat-curing mass for the manufacture of wear linings in tundishes, backfills in ladles and other equivalent applications |
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| NO20120757A1 NO20120757A1 (en) | 2013-12-30 |
| NO339659B1 true NO339659B1 (en) | 2017-01-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992009542A1 (en) * | 1990-11-22 | 1992-06-11 | Specialty Refractories Inc. | Heat activated repair agent |
| CN101613216A (en) * | 2009-04-09 | 2009-12-30 | 北京利尔高温材料股份有限公司 | A kind of environment-friendly flowing tundish dry material and preparation method thereof |
| CN101823888A (en) * | 2010-03-29 | 2010-09-08 | 天津大学 | Working lining for continuous cast steel tundish with environmental-friendly binder |
| CN102120704A (en) * | 2011-03-07 | 2011-07-13 | 山东中齐耐火材料有限公司 | Environmentally-friendly tundish dry material |
| CN102180683A (en) * | 2011-03-08 | 2011-09-14 | 武汉科技大学 | Magnesium-calcium tundish dry vibrating material and preparation method thereof |
-
2012
- 2012-06-29 NO NO20120757A patent/NO339659B1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992009542A1 (en) * | 1990-11-22 | 1992-06-11 | Specialty Refractories Inc. | Heat activated repair agent |
| CN101613216A (en) * | 2009-04-09 | 2009-12-30 | 北京利尔高温材料股份有限公司 | A kind of environment-friendly flowing tundish dry material and preparation method thereof |
| CN101823888A (en) * | 2010-03-29 | 2010-09-08 | 天津大学 | Working lining for continuous cast steel tundish with environmental-friendly binder |
| CN102120704A (en) * | 2011-03-07 | 2011-07-13 | 山东中齐耐火材料有限公司 | Environmentally-friendly tundish dry material |
| CN102180683A (en) * | 2011-03-08 | 2011-09-14 | 武汉科技大学 | Magnesium-calcium tundish dry vibrating material and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| NO20120757A1 (en) | 2013-12-30 |
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