CA2227100A1 - Refractory ceramic bricks - Google Patents
Refractory ceramic bricks Download PDFInfo
- Publication number
- CA2227100A1 CA2227100A1 CA002227100A CA2227100A CA2227100A1 CA 2227100 A1 CA2227100 A1 CA 2227100A1 CA 002227100 A CA002227100 A CA 002227100A CA 2227100 A CA2227100 A CA 2227100A CA 2227100 A1 CA2227100 A1 CA 2227100A1
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- Canada
- Prior art keywords
- refractory ceramic
- weight
- bricks
- brick
- hollow spheres
- Prior art date
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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
-
- 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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
-
- 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
- F27D1/0003—Linings or walls
- F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
Abstract
A refractory ceramic brick, having low thermal conductivity, contains 90 to 99 % by weight of metal oxide matrix material and 1 to 10 % by weight of thermally stable filler material in the form of hollow spheres having a grain size less than 5.0 mm.
Description
DIDIE-R WERKE AG PATENTABTEILUNG ~ +49 611 605759 15/01 '98 08:02 ~ :03/11 N0:361 ~ACKGROUND OF TH~ INVENTION
Field of the Inv~ntion This invention relates eo a re~ractory ceramic brlck, ~nd more spccific~lly, a ~~r~to"~ ceramlc hrick havin~ lovv thermal conductivity.
De8crlntion Qf th~ Prior Art Such bricks ar~ substantially known for two ~ppllcation fields. A first application field is for the backin~-up of rcfractory linin~s with 50-~allcd insulatin~
bricks. Thercln thr~ primary focus i~ on therm~l insulation. The~e bricks ar~ not eYroscd to n~echanical or chemical attack of any Icind, either whcn us~ In metallur~ical meltin~ vessels or when use~, for ex~mple, in cement oyllndrical rotary kilns.
PE 33 26 ;270 C2 discloses such insulatln~ bricks, ~uring the production of which are add~d combustible materials which, aftHr the firin~, tncre~se the pore volume and th~ls the insulatin~ propertiHs of the bricks. On a simil~r prin~iple, DE 33 02 368 A1 su~ests the us~ of li~htwei~ht expande~ clay a~re~ate to inc:rsase the pore volume o~ htwHi~ht b~Jildinr~ brick.
A seGond application field i~ fof bricks which are ~xpased to direct thermal, m~chanical ~nci chemi~l attack, for example in the cas~ of bricks for linlnçl cement cylindrical rotary kilns, where a substantial criterion is also the lowest possible thermal conductivity. The reason is primarily that cylinclriGal rotar~ kiln5 arH, as a rule, DIDIE.R WERKE AG PATENTABTEILUNG ~ +49 611 605759 15/01 '98 08:02 1~ :04/11 N0:361 deliv~red as sin~le-layer kilns, which means an insulatin~ layer or backin~ is omitted.
The bri-;k~ u~Hd in thix case must consequently me~t hi~hly differin~ r~quirements~
The prlor ,~rt bricks contain approxirnately ~O to 99% by wei~ht of a metal oxide rnatrix material.
EP O 7~3 C145 A2 discloses the use of oxidic hollow spherss, for the pro~uction of thermally insulating formed bodies in which the hollow spheres are fixed to one anc~the~ only ~y !bon~in~ a~ents.
BRIEF SUMNIAR'Y OF ~I~E INVENTION
The present inv~ntion is directHd to an irnproved brick for the second ~pplic~tion field diwus~ed above, hav;n~ comparable chemical and mechanical propert;es con~pared to the prior art brieks, bllt improved, i.e. Iower, thermal conductivity ~s compAred to thR prior art bricks.
Thi~ can be achieved, in accordance vvith th~ prH~Hnt invention, by a brick whir h comprises, a metal oxide matrix materi~l and a thermally stablH filler material fabricated in the form of hollow bodies.
DETAILED DESCP~IPTION OF THE INvENTlON
Thu$, thH pr~sRnt invantion provid~s ~ refractory c~ramic brick which comprise~
gO to 9g% by wei~ht of metal oxide matrix material, and 1 to 10 % b~ wei~ht of hollow spheres, havin~ a ~rain size less th~n 5.0 mm, o~ a thermally stabl~ flller material, wherein ~he wei~h~ percentaE~es are based on the wei~3ht of the brick.
DI~IE.R WlRKE AG PATENTABTEILUNG ~ +49 611 605759 15/01 '98 08:02 ~ :05J11 N0:361 Any met~l oxide m~trix material s~itable for refractory ceramic bricks oan be employed, exarrlples of which are sintered ma~n~sia, flux ma~nesi~, alumina, corundum, zirconium dioxide an~ spinels therefrorn.
As Indlcated above, the use of ox;de hollow spheres is known ~rorn EP 0 723 945 A:2. 1 lovvever, in that publication, they at~ applicd for the pro~uctlon ofthermally insulatin~ form~d bodies in which the hollow sphere~ are fixed to one another only by bondin~ a~ents. Therefore the rstio of hollow spheres to ~ond;n~
a~ent accoJding l:o the examples in the publicatlon Is approximat~ly 10;1, even thou~h ~en~ally ~rvei~ht ratios of hollow spheres to bondin~ agent of 95:5 to 20:80 are dlscloscd. In ~ny event, thermally irlsulatin~ formed bodies are obtained of a c~mpletely different type than those of the pres~nt invention.
Accordin~ to a preferr~ ~mbodiment of the present invention, the wei~ht ratios of the met~l oxldn matrix rnateriel to thH filler material is g3-g7 wt %: 3-7 wt %.
The mHtal oxi~e n~atrix meterial thus Is cl~arly the primary focu~ and Is Indlspensabl~
in l~rder to fulfil the good chemical, th~rmal and mechanical propsrties which, apart frorn the requirecl lov~ thermal conductivity, con~inue to be dernand~d of th~ refractory ceramic btick.
The hollow-sphere filler material can compri~Q the same material ~s the matrix material, for exemple alumina or corundum.
Accordin~ eo another pr~fer~ed embo~iment, the filler material, to~ether with thH metal oxide matrix rnaterial, are spinsl-formins~.
DIDIER WERKE AG PATEINTABTEILUNG ~ +49 611 605759 15J01 '98 08:02 1~ :06/11 N0:361 lf, for ~xarnple, sintered ma~nesia i8 us~d as a substsntial component of the rnatrlx rnaterlal, tlhe flller material can ~ornprlse hollow-sphere corund~m Yvhi~h, at the correspon~ln~ firin~ temperatures is spinel-forrnin~ with the matrix rn~tnrlal, 85 wili be ~xplain~d in further detaii in the followin~.
lt h~ beeln found to be in every r~spect an optimization to 5elec:t the m~trix materi~l and the fillr~r materi~l from components which ~rc spinel-formln~ with one annther, wh~reby thQ stability of thH brick can addltion~lly ~e irnproved overall, and in this way, the m~chanical, chemical and therm~l characteristics of the brick ~fr~
sirnult~nflously opti~nized.
Dependin~ on the choice of st~rtin~ material the person skilled in the art can determine ~mpirically a suitable firin~ temperature as well as a correspondin~ firin~
time. Conventional firing temperatures ~nd tirnes are appr~priate in the present invention .
In spite olF the hollow-sphere fluxin~ substances, throuyh the hi~h fraction of conventional metal oxir~ matrix m~terial the pre~sure and ~brasion stren~th of the brick, telatlve to known brick qualities, are r~tained to thH largest po~ible extent.
Thus, th~ brlck can also be used in partic~Jlar with single-lay~r llnin0s which ar~
difectly expos~cl to the p~ ular product to be treated and to the kiln atrno~phere.
i3rlcks bas~d on slntered rna~n~sie, or ma~n~si~-alumin~-spinnl are suitable for the production ~f rotar~l kiln bricks. In this casH the flller matsrial comprises, for ex~mplc, hollow-sphcre corundum, which should h~ve an Al~03 oontent of more than ~t7 wt %, pr~fHrably more than 99 Wt %.
DIDIER WERKE AG PATEINTABTEILUNG ~ +49 611 605759 15/01 '98 08:02 bl :07/11 N0:361 Th~ ~rain slze of thc hollow spheres ix less than 5.0 rnm, for example, 0.5 to lesx than 5.0 mnn.
The prMsent invention will be illustratRd in more detail by reference to the exHmples below, which are for the purpo~e of lllustration only, and ~hol~ld not be consi~re~l to lin1lt the invention.
m~les Reference brick ~R~ for compari~on is a brick ba~ed on sintered ma~nHsia .5 wt ~~) with the followin~ grain ~ize distribution:
approximately 40 wt 96 in the range of 1.0 to 5.0 mm, approxlm~3t~1y 20 wt % in thn r~nge of 0.1 to 1.0 mm, and approximately 40 wt % in the ~ust fraction ~smaller than 0.1 n~m~.
The refer~snce brick, fired at approximately 1,700~ C, comprls~s in addltlon 5 wt % ma~ne~sia-alumina 5pin~1s of ~rain size 1 to ~ mrn as well as 2.5 wt %
corundum of ~r~3~n ~i~e 0.5 to 1.5 mm.
ComparQd to reference brick ~R) is a first brick ~A) a~cordin~ to the inventlon comprisin~ 91 urt ~6 of th~ same sinter~ ma~nesia, S ~t ~6 of the ma~nesi~-alumina ~pinnls and ~ wt % o~ hollow-sphere corun~um with 99 wt % Al;!03 in a ~rain size of 1 to 3 mm.
A further sample ~ aec~rdin~ to the inv~ntion is 8 brick analo~ous to A which, however, was lfirad ~or approxirnately twi~;~ the length of time as brlck /~, also at DIDIER W~RKE AG PATEINTABTEILUNG ~ +49 611 605759 15/01 '98 08:02 ~ :08/11 N0:361 approxlrnat~ly 1,700~ t::, with the simultaneous spin~l fo~ mation between the hollow-sphere corundum and th~ ma~nesitic mat~ix material.
The m~asured data for samples R, A and B are listed in ~he followin~ t~bl~.
S~rnple A B R
Bulk density (~/~cm3~ 2.83 2.80 2.85 Pnrosit~ ~%) 20.00 20.70 19.00 Cold test pressure (Nlmm2) 42.00 35.00 50.00 Thermal conductivity (WtmK) 400~ C Z.70 2.60 4.~iO
700~ C 2,50 2.40 3.70 1100~ C 2.40 2.20 2.90 First, the expected lower bulk density of samples A and B is notable. This is in dlrect relationship to the e~tpected higher porosity.
While the cold tHSt pr~ssure, also expect0~, decre~ses sli~htly compar~d to the ref~rence ~ampltl, the listed values of therm~l con~u~tivity at 400, 700 and 1 100~ C
show chHracteri!itic improvements of hricks A and E~ up to ~0%.
The ~dvantages resulting thereby were verified in a ce~n~nt rotary cylindrical kiln ~t ~3n interic~ kiln t~mperE~ture of 1450~ C. The kiln shcll ~asin~ temperatures were:
DIDIE.R WERK~ AG PATElNTA~TtILUNG ~ +49 611 605759 15/01 '98 08:0Z 1~ :09~11 N0:361 ~pproxirnately 430~ C ~u~in~ bricks R~, approxlrn~t~lv 390~ C ~u~ln~ bricks A~, and approx;maeely 375~ C lusin~ bricks B~.
The~e extl3rnal kiln temparatures. which are lo~Jver by 40 to 55~ C; for the present inventior1, reduce the heat Inss and, correspond;n~ly, the ener~y costs. In addition, tl~--r,llal and mechanical problems of the kiln are simult~neously reduced.
Field of the Inv~ntion This invention relates eo a re~ractory ceramic brlck, ~nd more spccific~lly, a ~~r~to"~ ceramlc hrick havin~ lovv thermal conductivity.
De8crlntion Qf th~ Prior Art Such bricks ar~ substantially known for two ~ppllcation fields. A first application field is for the backin~-up of rcfractory linin~s with 50-~allcd insulatin~
bricks. Thercln thr~ primary focus i~ on therm~l insulation. The~e bricks ar~ not eYroscd to n~echanical or chemical attack of any Icind, either whcn us~ In metallur~ical meltin~ vessels or when use~, for ex~mple, in cement oyllndrical rotary kilns.
PE 33 26 ;270 C2 discloses such insulatln~ bricks, ~uring the production of which are add~d combustible materials which, aftHr the firin~, tncre~se the pore volume and th~ls the insulatin~ propertiHs of the bricks. On a simil~r prin~iple, DE 33 02 368 A1 su~ests the us~ of li~htwei~ht expande~ clay a~re~ate to inc:rsase the pore volume o~ htwHi~ht b~Jildinr~ brick.
A seGond application field i~ fof bricks which are ~xpased to direct thermal, m~chanical ~nci chemi~l attack, for example in the cas~ of bricks for linlnçl cement cylindrical rotary kilns, where a substantial criterion is also the lowest possible thermal conductivity. The reason is primarily that cylinclriGal rotar~ kiln5 arH, as a rule, DIDIE.R WERKE AG PATENTABTEILUNG ~ +49 611 605759 15/01 '98 08:02 1~ :04/11 N0:361 deliv~red as sin~le-layer kilns, which means an insulatin~ layer or backin~ is omitted.
The bri-;k~ u~Hd in thix case must consequently me~t hi~hly differin~ r~quirements~
The prlor ,~rt bricks contain approxirnately ~O to 99% by wei~ht of a metal oxide rnatrix material.
EP O 7~3 C145 A2 discloses the use of oxidic hollow spherss, for the pro~uction of thermally insulating formed bodies in which the hollow spheres are fixed to one anc~the~ only ~y !bon~in~ a~ents.
BRIEF SUMNIAR'Y OF ~I~E INVENTION
The present inv~ntion is directHd to an irnproved brick for the second ~pplic~tion field diwus~ed above, hav;n~ comparable chemical and mechanical propert;es con~pared to the prior art brieks, bllt improved, i.e. Iower, thermal conductivity ~s compAred to thR prior art bricks.
Thi~ can be achieved, in accordance vvith th~ prH~Hnt invention, by a brick whir h comprises, a metal oxide matrix materi~l and a thermally stablH filler material fabricated in the form of hollow bodies.
DETAILED DESCP~IPTION OF THE INvENTlON
Thu$, thH pr~sRnt invantion provid~s ~ refractory c~ramic brick which comprise~
gO to 9g% by wei~ht of metal oxide matrix material, and 1 to 10 % b~ wei~ht of hollow spheres, havin~ a ~rain size less th~n 5.0 mm, o~ a thermally stabl~ flller material, wherein ~he wei~h~ percentaE~es are based on the wei~3ht of the brick.
DI~IE.R WlRKE AG PATENTABTEILUNG ~ +49 611 605759 15/01 '98 08:02 ~ :05J11 N0:361 Any met~l oxide m~trix material s~itable for refractory ceramic bricks oan be employed, exarrlples of which are sintered ma~n~sia, flux ma~nesi~, alumina, corundum, zirconium dioxide an~ spinels therefrorn.
As Indlcated above, the use of ox;de hollow spheres is known ~rorn EP 0 723 945 A:2. 1 lovvever, in that publication, they at~ applicd for the pro~uctlon ofthermally insulatin~ form~d bodies in which the hollow sphere~ are fixed to one another only by bondin~ a~ents. Therefore the rstio of hollow spheres to ~ond;n~
a~ent accoJding l:o the examples in the publicatlon Is approximat~ly 10;1, even thou~h ~en~ally ~rvei~ht ratios of hollow spheres to bondin~ agent of 95:5 to 20:80 are dlscloscd. In ~ny event, thermally irlsulatin~ formed bodies are obtained of a c~mpletely different type than those of the pres~nt invention.
Accordin~ to a preferr~ ~mbodiment of the present invention, the wei~ht ratios of the met~l oxldn matrix rnateriel to thH filler material is g3-g7 wt %: 3-7 wt %.
The mHtal oxi~e n~atrix meterial thus Is cl~arly the primary focu~ and Is Indlspensabl~
in l~rder to fulfil the good chemical, th~rmal and mechanical propsrties which, apart frorn the requirecl lov~ thermal conductivity, con~inue to be dernand~d of th~ refractory ceramic btick.
The hollow-sphere filler material can compri~Q the same material ~s the matrix material, for exemple alumina or corundum.
Accordin~ eo another pr~fer~ed embo~iment, the filler material, to~ether with thH metal oxide matrix rnaterial, are spinsl-formins~.
DIDIER WERKE AG PATEINTABTEILUNG ~ +49 611 605759 15J01 '98 08:02 1~ :06/11 N0:361 lf, for ~xarnple, sintered ma~nesia i8 us~d as a substsntial component of the rnatrlx rnaterlal, tlhe flller material can ~ornprlse hollow-sphere corund~m Yvhi~h, at the correspon~ln~ firin~ temperatures is spinel-forrnin~ with the matrix rn~tnrlal, 85 wili be ~xplain~d in further detaii in the followin~.
lt h~ beeln found to be in every r~spect an optimization to 5elec:t the m~trix materi~l and the fillr~r materi~l from components which ~rc spinel-formln~ with one annther, wh~reby thQ stability of thH brick can addltion~lly ~e irnproved overall, and in this way, the m~chanical, chemical and therm~l characteristics of the brick ~fr~
sirnult~nflously opti~nized.
Dependin~ on the choice of st~rtin~ material the person skilled in the art can determine ~mpirically a suitable firin~ temperature as well as a correspondin~ firin~
time. Conventional firing temperatures ~nd tirnes are appr~priate in the present invention .
In spite olF the hollow-sphere fluxin~ substances, throuyh the hi~h fraction of conventional metal oxir~ matrix m~terial the pre~sure and ~brasion stren~th of the brick, telatlve to known brick qualities, are r~tained to thH largest po~ible extent.
Thus, th~ brlck can also be used in partic~Jlar with single-lay~r llnin0s which ar~
difectly expos~cl to the p~ ular product to be treated and to the kiln atrno~phere.
i3rlcks bas~d on slntered rna~n~sie, or ma~n~si~-alumin~-spinnl are suitable for the production ~f rotar~l kiln bricks. In this casH the flller matsrial comprises, for ex~mplc, hollow-sphcre corundum, which should h~ve an Al~03 oontent of more than ~t7 wt %, pr~fHrably more than 99 Wt %.
DIDIER WERKE AG PATEINTABTEILUNG ~ +49 611 605759 15/01 '98 08:02 bl :07/11 N0:361 Th~ ~rain slze of thc hollow spheres ix less than 5.0 rnm, for example, 0.5 to lesx than 5.0 mnn.
The prMsent invention will be illustratRd in more detail by reference to the exHmples below, which are for the purpo~e of lllustration only, and ~hol~ld not be consi~re~l to lin1lt the invention.
m~les Reference brick ~R~ for compari~on is a brick ba~ed on sintered ma~nHsia .5 wt ~~) with the followin~ grain ~ize distribution:
approximately 40 wt 96 in the range of 1.0 to 5.0 mm, approxlm~3t~1y 20 wt % in thn r~nge of 0.1 to 1.0 mm, and approximately 40 wt % in the ~ust fraction ~smaller than 0.1 n~m~.
The refer~snce brick, fired at approximately 1,700~ C, comprls~s in addltlon 5 wt % ma~ne~sia-alumina 5pin~1s of ~rain size 1 to ~ mrn as well as 2.5 wt %
corundum of ~r~3~n ~i~e 0.5 to 1.5 mm.
ComparQd to reference brick ~R) is a first brick ~A) a~cordin~ to the inventlon comprisin~ 91 urt ~6 of th~ same sinter~ ma~nesia, S ~t ~6 of the ma~nesi~-alumina ~pinnls and ~ wt % o~ hollow-sphere corun~um with 99 wt % Al;!03 in a ~rain size of 1 to 3 mm.
A further sample ~ aec~rdin~ to the inv~ntion is 8 brick analo~ous to A which, however, was lfirad ~or approxirnately twi~;~ the length of time as brlck /~, also at DIDIER W~RKE AG PATEINTABTEILUNG ~ +49 611 605759 15/01 '98 08:02 ~ :08/11 N0:361 approxlrnat~ly 1,700~ t::, with the simultaneous spin~l fo~ mation between the hollow-sphere corundum and th~ ma~nesitic mat~ix material.
The m~asured data for samples R, A and B are listed in ~he followin~ t~bl~.
S~rnple A B R
Bulk density (~/~cm3~ 2.83 2.80 2.85 Pnrosit~ ~%) 20.00 20.70 19.00 Cold test pressure (Nlmm2) 42.00 35.00 50.00 Thermal conductivity (WtmK) 400~ C Z.70 2.60 4.~iO
700~ C 2,50 2.40 3.70 1100~ C 2.40 2.20 2.90 First, the expected lower bulk density of samples A and B is notable. This is in dlrect relationship to the e~tpected higher porosity.
While the cold tHSt pr~ssure, also expect0~, decre~ses sli~htly compar~d to the ref~rence ~ampltl, the listed values of therm~l con~u~tivity at 400, 700 and 1 100~ C
show chHracteri!itic improvements of hricks A and E~ up to ~0%.
The ~dvantages resulting thereby were verified in a ce~n~nt rotary cylindrical kiln ~t ~3n interic~ kiln t~mperE~ture of 1450~ C. The kiln shcll ~asin~ temperatures were:
DIDIE.R WERK~ AG PATElNTA~TtILUNG ~ +49 611 605759 15/01 '98 08:0Z 1~ :09~11 N0:361 ~pproxirnately 430~ C ~u~in~ bricks R~, approxlrn~t~lv 390~ C ~u~ln~ bricks A~, and approx;maeely 375~ C lusin~ bricks B~.
The~e extl3rnal kiln temparatures. which are lo~Jver by 40 to 55~ C; for the present inventior1, reduce the heat Inss and, correspond;n~ly, the ener~y costs. In addition, tl~--r,llal and mechanical problems of the kiln are simult~neously reduced.
Claims (5)
1. Refractory ceramic brick which comprises, based on the weight of the brick;
90 to 99 % by weight of metal oxide matrix material, and 1 to 10 % to weight of hollow spheres, having a grain size less than 5.0 mm, of a thermally stable filler material.
90 to 99 % by weight of metal oxide matrix material, and 1 to 10 % to weight of hollow spheres, having a grain size less than 5.0 mm, of a thermally stable filler material.
2. The refractory ceramic brick according to claim 1, wherein the amount of the metal oxide matrix material is 93 to 97 % by weight, and the amount of the hollow spheres is 3 to 7 % by weight.
3. The refractory ceramic brick according to claim 1, wherein the filler material is the same material as the matrix material.
4. The refractory ceramic brick according to claim 1, wherein the hollow spheres have a grain size of 0.5 to less than 5.0 mm.
5. The refractory ceramic brick according to claim 1, wherein the matrix material and the filler material form a spinel with each other.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19701109A DE19701109A1 (en) | 1997-01-15 | 1997-01-15 | Refractory ceramic stone |
| DE19701109-8-45 | 1997-01-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2227100A1 true CA2227100A1 (en) | 1998-07-15 |
Family
ID=7817405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002227100A Abandoned CA2227100A1 (en) | 1997-01-15 | 1998-01-15 | Refractory ceramic bricks |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0854124A1 (en) |
| CA (1) | CA2227100A1 (en) |
| DE (1) | DE19701109A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107602137A (en) * | 2017-09-22 | 2018-01-19 | 马鞍山利尔开元新材料有限公司 | A kind of moulding by casting converter taphole inner nozzle brick and preparation method thereof |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60033759T2 (en) | 1999-10-29 | 2007-12-06 | Nippon Shokubai Co. Ltd. | Distillation apparatus and distillation method |
| WO2003093954A2 (en) | 2002-05-03 | 2003-11-13 | Pixearth, Corporation | A system to navigate within images spatially referenced to a computed space |
| GB0226997D0 (en) * | 2002-11-19 | 2002-12-24 | Welding Inst | Heat resistant product |
| DE102017111849A1 (en) | 2017-05-30 | 2018-12-06 | HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung | Process for the production of insulating material or an insulating product for the refractory industry, corresponding insulating materials and products as well as uses |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4885203A (en) * | 1987-07-01 | 1989-12-05 | Applied Ultralight Technologies, Inc. | Lightweight fired building products |
| US4874726A (en) * | 1987-11-18 | 1989-10-17 | Dresser Industries, Inc. | Lightweight fused silica refractory compositions |
| US5252526A (en) * | 1988-03-30 | 1993-10-12 | Indresco Inc. | Insulating refractory |
| GB9124403D0 (en) * | 1991-11-16 | 1992-01-08 | Foseco Int | Ceramic material |
| DE4208155A1 (en) * | 1992-03-13 | 1993-09-16 | Annawerk Gmbh | Light refractory ceramic material - has spherical pores formed by hollow sphere addn. to starting material |
| GB9319603D0 (en) * | 1993-09-22 | 1993-11-10 | British Steel Plc | Thermal insulating bricks |
| DE19538667C2 (en) * | 1995-01-30 | 1997-08-14 | Comtrade Ltd | Process for the production of heat-insulating moldings, heat-insulating moldings produced by the process and their use |
| US5602063A (en) * | 1995-03-30 | 1997-02-11 | Minteq International, Inc. | Lightweight sprayable tundish lining composition |
-
1997
- 1997-01-15 DE DE19701109A patent/DE19701109A1/en not_active Withdrawn
-
1998
- 1998-01-09 EP EP98100241A patent/EP0854124A1/en not_active Withdrawn
- 1998-01-15 CA CA002227100A patent/CA2227100A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107602137A (en) * | 2017-09-22 | 2018-01-19 | 马鞍山利尔开元新材料有限公司 | A kind of moulding by casting converter taphole inner nozzle brick and preparation method thereof |
| CN107602137B (en) * | 2017-09-22 | 2020-01-10 | 马鞍山利尔开元新材料有限公司 | Inner nozzle brick of steel tapping hole of cast-molded converter and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19701109A1 (en) | 1998-07-16 |
| EP0854124A1 (en) | 1998-07-22 |
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