NO143700B - HEAT-FAST, DEEDBRENT MAGNESIA-BASED GRAIN MATERIAL AND PROCEDURES FOR PRODUCING THEREOF - Google Patents
HEAT-FAST, DEEDBRENT MAGNESIA-BASED GRAIN MATERIAL AND PROCEDURES FOR PRODUCING THEREOF Download PDFInfo
- Publication number
- NO143700B NO143700B NO752949A NO752949A NO143700B NO 143700 B NO143700 B NO 143700B NO 752949 A NO752949 A NO 752949A NO 752949 A NO752949 A NO 752949A NO 143700 B NO143700 B NO 143700B
- Authority
- NO
- Norway
- Prior art keywords
- weight
- heat
- dead
- dicalcium silicate
- magnesia
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims description 20
- 238000000034 method Methods 0.000 title description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 39
- 239000000395 magnesium oxide Substances 0.000 claims description 19
- 235000012245 magnesium oxide Nutrition 0.000 claims description 16
- 229910052845 zircon Inorganic materials 0.000 claims description 11
- DJOYTAUERRJRAT-UHFFFAOYSA-N 2-(n-methyl-4-nitroanilino)acetonitrile Chemical compound N#CCN(C)C1=CC=C([N+]([O-])=O)C=C1 DJOYTAUERRJRAT-UHFFFAOYSA-N 0.000 claims description 10
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 10
- 235000012241 calcium silicate Nutrition 0.000 claims description 10
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 10
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 2
- 239000000347 magnesium hydroxide Substances 0.000 claims description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 19
- 239000001095 magnesium carbonate Substances 0.000 description 16
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 16
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 16
- 239000004575 stone Substances 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052599 brucite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- 239000000289 melt material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C04B35/01—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
- C04B35/0435—Refractories from grain sized mixtures containing refractory metal compounds other than chromium oxide or chrome ore
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Processing Of Solid Wastes (AREA)
- Glass Compositions (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Ceramic Products (AREA)
Description
Denne oppfinnelse angår et varmefast, dødbrent magnesia-basert kornmateriale med en relativ densitet This invention relates to a heat-resistant, dead-burnt magnesia-based granular material with a relative density
på over 3,3, karakterisert vedof over 3.3, characterized by
at det består av 85-95 vekt% periklas, 2,5-7,7 vekt% kalsiumzirkonat og 2,4-7,4 vekt% dikalsiumsilikat, og at det har periklaskrystallitter som er omgitt av en film av dikalsiumsilikat, og finkrystallinsk kalsiumzirkonat innen filmen. that it consists of 85-95 wt% periclase, 2.5-7.7 wt% calcium zirconate and 2.4-7.4 wt% dicalcium silicate, and that it has periclase crystallites which are surrounded by a film of dicalcium silicate, and finely crystalline calcium zirconate within the film.
En foretrukken utførelsesform går ut på at kornmaterialet A preferred embodiment is that the grain material
inneholder opptil 10 vekt% kalsiumzirkonat pluss dikalsiumsilikat. contains up to 10% by weight of calcium zirconate plus dicalcium silicate.
Oppfinnelsen angår også en fremgangsmåte til fremstilling The invention also relates to a method for production
av et varmefast, dødbrent magnesia-basert kornmateriale med en relativ densitet of a heat-resistant, dead-burnt magnesia-based granular material with a relative density
på over 3,3. of over 3.3.
Ved fremstilling av stål har utviklingen gått i retning av stadig større konvertere for oksygenbehandlingen. Dette har medført store krav til de varmefaste materialer som anvendes i konverterforingen. Mange store konvertere (det vil si de som har en kapasitet på 150 tonn og derover) fores delvis med brent tjæ-reimpregnert magnesittsten, hvilket i og for seg er en relativt ny utvikling. I disse konvertere anvendes også sten som er bundet sammen med tjærematerialer. In the production of steel, development has gone in the direction of increasingly large converters for the oxygen treatment. This has resulted in high demands on the heat-resistant materials used in the converter lining. Many large converters (that is, those with a capacity of 150 tonnes and above) are partially lined with burnt tar-reimpregnated magnesite stone, which in itself is a relatively new development. In these converters, stone is also used which is bound together with tar materials.
Magnesittsten er varmefast sten som fremstilles hovedsakelig eller fullstendig av dødbrent magnesitt. Dødbrent magnesitt er det granulære produkt som fås ved brenning av mineralet magnesitt (MgCO^) eller andre materialer som kan omdannes til magnesia (MgO) ved oppheting til temperaturer på ca. 1900°C eller høyere i tilstrekkelig lang tid til at det dannes hydratasjonsresistente granuler med høy tetthet. Dødbrent magnesitt betegnes av fagfolk ofte bare "magnesitt". Magnesitter fås av naturlige og syntetiske materialer med stort sett ekvivalente egenskaper. Magnesitter fra naturlige materialer er produkter som fremstilles ved behandling av naturlig forekommende mineraler, så som magnesitt, breunneritt og brucitt. Magnesitter fremstilt av syntetiske materialer erholdes ved utfelling av magnesiumforbindelser fra sjøvann og'magnesium-holdige saltløsninger. Ved den foreliggende oppfinnelse fremstilles magnesia-baserte kornmaterialer ut fra syntetiske materialer, hvilket er økonomisk fordelaktig. Magnesite stone is a heat-resistant stone that is produced mainly or completely from dead-burnt magnesite. Dead-burnt magnesite is the granular product obtained by burning the mineral magnesite (MgCO^) or other materials that can be converted to magnesia (MgO) by heating to temperatures of approx. 1900°C or higher for a sufficient time to form hydration-resistant granules of high density. Dead-burnt magnesite is often referred to by professionals as simply "magnesite". Magnesites are obtained from natural and synthetic materials with largely equivalent properties. Magnesites from natural materials are products that are produced by processing naturally occurring minerals, such as magnesite, breunnerite and brucite. Magnesites made from synthetic materials are obtained by precipitation of magnesium compounds from seawater and magnesium-containing salt solutions. In the present invention, magnesia-based grain materials are produced from synthetic materials, which is economically advantageous.
Sten fremstilt av meget rene syntetiske magnesittmaterialer med kalk/silika-molforhold litt over eller under 2 : 1, er meget varmefaste, men er uheldigvis noe vanskelige å frem-stille. Mange av disse stentyper viser en uheldig tilbøyelighet til avskalling under cykliske temperaturvariasjoner. Forskjellige flukser, dødbrenningsmidler etc. er blitt foreslått som additiver til det granulære materiale eller til stenen som fremstilles derav, med sikte på å øke tettheten og å motvirke tendensen til avskalling; men slike flukser, som riktignok øker tettheten og i noen tilfeller reduserer avskallingstendensen, viste seg å nedsette den brente stenens varmefasthet, redusere dens motstandsdyktighet mot korrosive gasser og har stort sett ikke vist seg helt tilfredsstil-lende . Stones made from very pure synthetic magnesite materials with a lime/silica molar ratio slightly above or below 2:1 are very heat-resistant, but are unfortunately somewhat difficult to produce. Many of these rock types show an unfortunate tendency to flaking under cyclical temperature variations. Various fluxes, dead-burning agents, etc., have been suggested as additives to the granular material or to the stone produced therefrom, with a view to increasing the density and counteracting the tendency to scale; but such fluxes, which admittedly increase the density and in some cases reduce the tendency to flaking, proved to reduce the heat resistance of the burnt stone, reduce its resistance to corrosive gases and have mostly not proved completely satisfactory.
Det er kjent å blande zirkon med magnesitt og således oppnå en varmefast blanding. Det tidligste arbeide på dette område er, såvidt vites, Rees and Chesters, Trans. Ceramic SOC, London, Vol. 29, side 309, mai 1930, som foreslår en blanding av magnesitt og zirkon med gråleire, øyensynlig som et dødbrenningsmiddel, for fremstilling av en ny varmefast forbindelse. It is known to mix zircon with magnesite and thus obtain a heat-resistant mixture. The earliest work in this area, as far as is known, is Rees and Chesters, Trans. Ceramic SOC, London, Vol. 29, page 309, May 1930, which suggests a mixture of magnesite and zircon with gray clay, apparently as a dead-burning agent, for the preparation of a new refractory compound.
I U.S. patent 1 952 120 erkjenner Comstock det bidrag som Rees og chesters har gitt, men påpeker visse vanskeligheter som han møtte da han fulgte deres anvisninger. Comstock foreslår fremstilling av et magnesitt-zirkon-maleprodukt. Dette fremstilles ved maling av magnesitt og zirkon til et pulver, idet man smelter en blanding av ca. 80% pulverisert zirkon og 20% pulverisert magnesitt, kjøler smeiten og pulveriserer den; dette pulveriserte smeltemateriale skulle så brukes som bindemiddel for ytterligere mengder grov magnesitt. Den således erholdte magnesitt formes etter ønske og brennes ved ca. 1540°C. Comstock hevder at han opp-når formstykker med meget stabilt volum og resistens mot avskalling. Det er selvsagt åpenbart at denne dobbelte maling eller pul-verisering og dobbelte brenning, som foreslås av Comstock, kan bli ganske kostbar med hensyn til arbeidskraft og materialbehandling. In the U.S. patent 1,952,120, Comstock acknowledges the contribution made by Rees and Chesters, but points out certain difficulties that he encountered in following their directions. Comstock proposes the manufacture of a magnesite-zircon grinding product. This is produced by grinding magnesite and zircon into a powder, melting a mixture of approx. 80% powdered zircon and 20% powdered magnesite, cools the smelt and pulverizes it; this pulverized melt material was then to be used as a binder for further quantities of coarse magnesite. The magnesite thus obtained is shaped as desired and fired at approx. 1540°C. Comstock claims that he achieves molded pieces with very stable volume and resistance to peeling. Of course, it is obvious that this double painting or pulverizing and double firing, as suggested by Comstock, can become quite expensive in terms of labor and material handling.
I U.S. patent nr. 3 192 059 beskriver Good et al fremstilling av magnesitt-zirkon-sten laget av et materiale inneholdende minst 10% zirkon. In the U.S. patent no. 3 192 059 Good et al describes the production of magnesite zircon stone made from a material containing at least 10% zircon.
Fremgangsmåten ifølge oppfinnelsen til fremstilling The method according to the invention for production
av et varmefast, dødbrent magnesia-basert kornmateriale er karakterisert ved at man blander magnesiumhydroksyd-oppslemning, kalkavgivende materiale og zirkon i mengdeforhold tilstrekkelig til å gi et MgO-innhold mellom 85 og 95 vekt% og kalsinerer blandingen med påfølgende dødbrenning til et kornmateriale som vesentlig består av 2,5-7,7 vekt% kalsiumzirkonat, of a heat-resistant, dead-burnt magnesia-based grain material is characterized by mixing magnesium hydroxide slurry, lime-releasing material and zircon in quantities sufficient to give an MgO content of between 85 and 95% by weight and calcining the mixture with subsequent dead-burning to a grain material that essentially consists of 2.5-7.7% by weight calcium zirconate,
2,4-7,4 vekt% dikalsiumsilikat og resten periklas. 2.4-7.4% by weight dicalcium silicate and the rest periclase.
Materialet kan mineralogisk karakteriseres som inneholdende periklaskrystallitter omgitt av en film av dikalsiumsilikat og fin-delt krystallinsk kalsiumzirkonat innen filmen. Kornene har en relativ densitet på ca. 3,3 eller høyere. The material can be mineralogically characterized as containing periclase crystallites surrounded by a film of dicalcium silicate and finely divided crystalline calcium zirconate within the film. The grains have a relative density of approx. 3.3 or higher.
Oppslemningen kalsineres ved tilstrekkelig høy temperatur til at alt fritt vann drives ut. Materialet blir så brikettert på i og for seg kjent måte og brennes ved temperaturer over 1650°C i opp til ca. fem timer. The slurry is calcined at a sufficiently high temperature to expel all free water. The material is then briquetted in a manner known per se and burned at temperatures above 1650°C for up to approx. five hours.
I det følgende eksempel er alle prosentangivelser på vekt-basis; kjemiske analysedata erholdtes ved spektrografiske analyser kontrollert ved hjelp av kjemiske våtveisanalyser og er angitt som oksyder, idet dette er vanlig praksis i angjeldende industri. Alle størrelser er målt ved hjelp av "Tyler Standard Screen Scale Sie-ves" . In the following example, all percentages are on a weight basis; chemical analysis data were obtained by spectrographic analysis controlled by means of chemical wet road analyzes and are indicated as oxides, as this is common practice in the relevant industry. All sizes are measured using "Tyler Standard Screen Scale Sieves".
Eksempel Example
Kornmaterialet i dette eksempel ble fremstilt ved oppslemning av en blanding av kaustisk magnesia inneholdende ca. 98% MgO, med hydratisert dolomitt og zirkon av størrelse minus 400 mesh i en mengde på henholdsvis 86,2 3%, 9,84% og 3,93%. Oppslemningen ble tørket og brikettert med i og for seg kjent apparatur (Komarek-Graaves Rolls) på lignende måte som ifølge U.S. patent nr. 3 060 000 (som hermed vises til). Brikettene ble brent ved 1727°c i 5 timer. Kornmaterialets romvekt var 3,39 kg/dm 3. Røntgenanalyse indikerte fullstendig reaksjon av dolomitten og zirkonet under dan-nelse av ca. 10% dikalsiumsilikat og kalsiumzirkonat, resten periklas. Analyse av kornmaterialet viste ca. 1,8% Si02/ 0,4% Al^ O^, 0,3% Fe203, 5,4% CaO, 3% Zr02, resten var MgO. The grain material in this example was produced by slurrying a mixture of caustic magnesia containing approx. 98% MgO, with hydrated dolomite and zircon of size minus 400 mesh in an amount of 86.2 3%, 9.84% and 3.93% respectively. The slurry was dried and briquetted with per se known apparatus (Komarek-Graaves Rolls) in a similar manner as according to U.S. patent no. 3 060 000 (to which reference is hereby made). The briquettes were burned at 1727°c for 5 hours. The bulk density of the grain material was 3.39 kg/dm 3. X-ray analysis indicated complete reaction of the dolomite and the zircon with the formation of approx. 10% dicalcium silicate and calcium zirconate, the rest periclase. Analysis of the grain material showed approx. 1.8% SiO 2 / 0.4% Al^ O^ , 0.3% Fe 2 O 3 , 5.4% CaO, 3% ZrO 2 , the rest was MgO.
Kornmaterialet ble så størrelsesgradert til minus 3 mesh og nedover til kulemøllestøv og blandet med 4% bek med et myknings-punkt på ca. 82,2-87,8°C, samt 2,3% kjønrøk. Blandingen ble for-met til sten på vanlig måte og brent ved 260°c i 5 timer. Stenen viste en bruddfasthet på gjennomsnittlig 117,5 kp/cm , og i dryppe-slaggprøven (BOF) ble ca. 20 cm <3>erodert. The grain material was then size graded to minus 3 mesh and down to ball mill dust and mixed with 4% pitch with a softening point of approx. 82.2-87.8°C, as well as 2.3% carbon black. The mixture was formed into stone in the usual way and fired at 260°C for 5 hours. The stone showed a breaking strength of 117.5 kp/cm on average, and in the drip slag test (BOF) approx. 20 cm <3>eroded.
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US49968274A | 1974-08-28 | 1974-08-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
NO752949L NO752949L (en) | 1976-03-02 |
NO143700B true NO143700B (en) | 1980-12-22 |
NO143700C NO143700C (en) | 1981-04-01 |
Family
ID=23986259
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO752949A NO143700C (en) | 1974-08-28 | 1975-08-27 | HEAT-FIXED, DEEDBRENT MAGNESIA-BASED GRAIN MATERIALS AND PROCEDURES FOR PRODUCING THEREOF |
Country Status (10)
Country | Link |
---|---|
JP (1) | JPS5134911A (en) |
BR (1) | BR7505452A (en) |
CA (1) | CA1055967A (en) |
GB (1) | GB1485728A (en) |
IN (1) | IN144867B (en) |
IT (1) | IT1040701B (en) |
NL (1) | NL7508418A (en) |
NO (1) | NO143700C (en) |
YU (1) | YU37295B (en) |
ZA (1) | ZA754175B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59118018A (en) * | 1982-12-23 | 1984-07-07 | 亘 重信 | Mushroom culture medium |
WO1998012150A1 (en) * | 1996-09-23 | 1998-03-26 | Premier Periclase Limited | A slag resistant sintermagnesia and a method of its production |
CN107188584A (en) * | 2017-07-18 | 2017-09-22 | 海城市中兴镁质合成材料有限公司 | A kind of fused magnesite and its preparation technology using dicalcium silicate as combination phase |
CN115959890B (en) * | 2023-01-09 | 2023-08-25 | 营口鼎盛实业有限公司 | Preparation method of modified magnesia refractory material |
-
1975
- 1975-06-10 CA CA229,018A patent/CA1055967A/en not_active Expired
- 1975-06-24 IT IT50202/75A patent/IT1040701B/en active
- 1975-06-28 IN IN1280/CAL/1975A patent/IN144867B/en unknown
- 1975-06-30 ZA ZA00754175A patent/ZA754175B/en unknown
- 1975-07-02 JP JP50081760A patent/JPS5134911A/en active Pending
- 1975-07-04 GB GB28360/75A patent/GB1485728A/en not_active Expired
- 1975-07-15 NL NL7508418A patent/NL7508418A/en not_active Application Discontinuation
- 1975-08-01 YU YU1968/75A patent/YU37295B/en unknown
- 1975-08-26 BR BR7505452*A patent/BR7505452A/en unknown
- 1975-08-27 NO NO752949A patent/NO143700C/en unknown
Also Published As
Publication number | Publication date |
---|---|
NO143700C (en) | 1981-04-01 |
CA1055967A (en) | 1979-06-05 |
IN144867B (en) | 1978-07-22 |
JPS5134911A (en) | 1976-03-25 |
AU8288675A (en) | 1977-01-13 |
ZA754175B (en) | 1976-06-30 |
YU37295B (en) | 1984-08-31 |
IT1040701B (en) | 1979-12-20 |
NO752949L (en) | 1976-03-02 |
NL7508418A (en) | 1976-03-02 |
GB1485728A (en) | 1977-09-14 |
BR7505452A (en) | 1976-08-03 |
YU196875A (en) | 1983-04-27 |
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