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Producto refractario y boquilla de colada
Un producto refractario que comprende particulas refractarias que contienen componentes de CaO y particulas refractarias que contienen componentes de MgO, conteniendo el producto refractario, en terminos de una composicion quimica medida despues de que se haya sometido a calentamiento en una atmosfera no oxidante a 1000 oC, uno o mas oxidos seleccionados del grupo que consiste en B2O3, TiO2, V2O5, P2O5 y SiO2 en una cantidad total del 0,1 al 5,0 % en masa, y carbono libre en una cantidad del 2 al 35 % en masa, incluyendo el resto CaO y MgO cuya relacion de masa (CaO/MgO) esta en el intervalo de 0,1 a 1,5, y en donde, en la observacion microscopica realizada a temperatura ambiente en una muestra del producto refractario que se ha sometido a calentamiento en una atmosfera no oxidante a 1000 oC, una pelicula inorganica compuesta de CaO y uno o mas oxidos seleccionados del grupo que consiste en B2O3, TiO2, V2O5, P2O5 y SiO2 se forma en al menos cada superficie de CaO de las particulas refractarias que contienen componentes de CaO, con un grosor de 0,1 a 25 μm.
The present invention is directed to preventing a refractory material comprising a CaO component from hydration (slaking) of CaO, in a production stage, during storage and in a casting stage, over long periods. Specifically, the present invention provides a refractory product comprising CaO component-containing refractory particles and MgO component-containing refractory particles. The refractory material contains, in terms of a chemical composition measured after it has undergone heating in a non-oxidizing atmosphere at 1000°C, one or more metal oxides selected from the group consisting of B 2 O 3 , TiO 2 , V 2 O 5 , P 2 O 5 and SiO 2 in a total amount of 0.1 to 5.0 mass%, and free carbon in an amount of 2 to 35 mass%, with the remainder including CaO and MgO whose mass ratio (CaO/MgO) is in the range of 0.1 to 1.5, wherein, in microscopic observation performed at room temperature on a sample of the refractory material which has undergone heating in a non-oxidizing atmosphere at 1000°C, an inorganic film comprised of CaO and the one or more metal oxides is formed in at least each CaO surface of the refractory particles each containing either one or both of a CaO component and an MgO component, with a thickness of 0.1 to 25 µm.
Producto refractario y boquilla de colada
Un producto refractario que comprende particulas refractarias que contienen componentes de CaO y particulas refractarias que contienen componentes de MgO, conteniendo el producto refractario, en terminos de una composicion quimica medida despues de que se haya sometido a calentamiento en una atmosfera no oxidante a 1000 oC, uno o mas oxidos seleccionados del grupo que consiste en B2O3, TiO2, V2O5, P2O5 y SiO2 en una cantidad total del 0,1 al 5,0 % en masa, y carbono libre en una cantidad del 2 al 35 % en masa, incluyendo el resto CaO y MgO cuya relacion de masa (CaO/MgO) esta en el intervalo de 0,1 a 1,5, y en donde, en la observacion microscopica realizada a temperatura ambiente en una muestra del producto refractario que se ha sometido a calentamiento en una atmosfera no oxidante a 1000 oC, una pelicula inorganica compuesta de CaO y uno o mas oxidos seleccionados del grupo que consiste en B2O3, TiO2, V2O5, P2O5 y SiO2 se forma en al menos cada superficie de CaO de las particulas refractarias que contienen componentes de CaO, con un grosor de 0,1 a 25 μm.
The present invention is directed to preventing a refractory material comprising a CaO component from hydration (slaking) of CaO, in a production stage, during storage and in a casting stage, over long periods. Specifically, the present invention provides a refractory product comprising CaO component-containing refractory particles and MgO component-containing refractory particles. The refractory material contains, in terms of a chemical composition measured after it has undergone heating in a non-oxidizing atmosphere at 1000°C, one or more metal oxides selected from the group consisting of B 2 O 3 , TiO 2 , V 2 O 5 , P 2 O 5 and SiO 2 in a total amount of 0.1 to 5.0 mass%, and free carbon in an amount of 2 to 35 mass%, with the remainder including CaO and MgO whose mass ratio (CaO/MgO) is in the range of 0.1 to 1.5, wherein, in microscopic observation performed at room temperature on a sample of the refractory material which has undergone heating in a non-oxidizing atmosphere at 1000°C, an inorganic film comprised of CaO and the one or more metal oxides is formed in at least each CaO surface of the refractory particles each containing either one or both of a CaO component and an MgO component, with a thickness of 0.1 to 25 µm.
Producto refractario y boquilla de colada
MORIKAWA KATSUMI (author) / SASAKI AKINARI (author) / YOSHITSUGU NAOMI (author)
2019-05-24
Patent
Electronic Resource
Spanish
| European Patent Office | 2017
| European Patent Office | 2020