ES2273605B2 - MOLDED PIECE OF INDUSTRIAL CERAMICS, PROCEDURE FOR OBTAINING AND EMPLOYMENT. - Google Patents
MOLDED PIECE OF INDUSTRIAL CERAMICS, PROCEDURE FOR OBTAINING AND EMPLOYMENT. Download PDFInfo
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- ES2273605B2 ES2273605B2 ES200550036A ES200550036A ES2273605B2 ES 2273605 B2 ES2273605 B2 ES 2273605B2 ES 200550036 A ES200550036 A ES 200550036A ES 200550036 A ES200550036 A ES 200550036A ES 2273605 B2 ES2273605 B2 ES 2273605B2
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000919 ceramic Substances 0.000 title claims abstract description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011575 calcium Substances 0.000 claims abstract description 9
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 150000004645 aluminates Chemical group 0.000 claims abstract 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 26
- 239000000395 magnesium oxide Substances 0.000 claims description 13
- 239000010459 dolomite Substances 0.000 claims description 9
- 229910000514 dolomite Inorganic materials 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- JXLHNMVSKXFWAO-UHFFFAOYSA-N azane;7-fluoro-2,1,3-benzoxadiazole-4-sulfonic acid Chemical compound N.OS(=O)(=O)C1=CC=C(F)C2=NON=C12 JXLHNMVSKXFWAO-UHFFFAOYSA-N 0.000 claims description 2
- 229920005610 lignin Polymers 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 238000010411 cooking Methods 0.000 claims 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- 229910010413 TiO 2 Inorganic materials 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 239000011449 brick Substances 0.000 description 22
- 239000011819 refractory material Substances 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 235000010755 mineral Nutrition 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000000930 thermomechanical effect Effects 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910001697 hibonite Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 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
- C04B35/10—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 aluminium oxide
- C04B35/101—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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Pieza moldeada de cerámica industrial, procedimiento para su obtención y empleo.Industrial ceramic molded part, procedure for obtaining and using it.
La invención se refiere a una pieza moldeada, de cerámica industrial, cocida al horno, alcalina, refractaria, que presenta como mínimo un componente de resistencia básico y un componente elástico, en donde el componente elástico es un aluminato de calcio de fórmula abreviada CA6. La invención se refiere además a un procedimiento para la producción de la pieza moldeada así como a su empleo.The invention relates to a molded part of industrial ceramics, baked, alkaline, refractory, which It has at least one basic resistance component and a elastic component, wherein the elastic component is an aluminate of calcium of abbreviated formula CA6. The invention further relates to a procedure for the production of the molded part as well as to your employment
Description
Pieza moldeada de cerámica industrial, procedimiento para su producción y empleo.Industrial ceramic molded part, procedure for its production and employment.
La invención se refiere a una pieza moldeada elastificada de cerámica industrial, refractaria, alcalina, cocida al horno, a base de por lo menos un componente de resistencia como la magnesia y la dolomita. La invención se refiere además a un procedimiento para la producción de la pieza moldeada y a su empleo.The invention relates to a molded part. elastified industrial ceramic, refractory, alkaline, cooked baked, based on at least one resistance component such as Magnesia and dolomite. The invention further relates to a procedure for the production of the molded part and its job.
Piezas moldeadas de tipo general se emplean como revestimiento refractario en particular en procesos de altas temperaturas con ataque alcalino de escorias, p. ej., en hornos, tanques o depósitos de cemento, cal, dolomita, magnesita, acero e industrias de metales no férricos, y también en la industria del vidrio.Molded parts of general type are used as refractory lining in particular in high processes temperatures with alkaline slag attack, p. e.g., in ovens, tanks or deposits of cement, lime, dolomite, magnesite, steel e non-ferrous metal industries, and also in the industry of glass.
Una pieza moldeada a base de un componente de resistencia (de aquí en adelante llamado simplemente resistor) como el MgO ó CaO/MgO (dolomita), presenta efectivamente un alto poder refractario y una buena resistencia química, es por regla general quebradiza, puesto que tiene un módulo de elasticidad (módulo E) relativamente alto y un desfavorable módulo de cizallamiento (módulo G). Este actúa negativamente en particular sobre la disipación de las tensiones térmicas, la resistencia a esfuerzos mecánicos y la estabilidad a los cambios de temperaturas (TWB). Es por lo tanto deseable ajustar bajos módulos de elasticidad puesto que éstos son los responsables de una estabilidad termomecánica.A molded part based on a component of resistance (hereafter simply called resistor) as MgO or CaO / MgO (dolomite), effectively has a high power refractory and good chemical resistance, as a rule brittle, since it has an elastic modulus (module E) relatively high and an unfavorable shear module (module G). This acts negatively in particular on the dissipation of thermal stresses, stress resistance mechanical and temperature change stability (TWB). Is therefore desirable to adjust low modulus of elasticity put that these are responsible for thermomechanical stability.
Para aumentar la elasticidad o respectivamente para la disminución de los módulos de elasticidad, es ya conocido el añadir un llamado componente de elastificación (en adelante llamado simplemente elastificante) a una mezcla para la producción de una pieza moldeada o el añadir unas primeras materias que en el horno de cocción cerámica generan el elastificante en la mezcla.To increase elasticity or respectively for the decrease of the modulus of elasticity, it is already known the add a so-called elastification component (hereinafter simply called elastifier) to a mixture for production of a molded part or adding some first materials that in the ceramic baking oven generate the elastifier in the mixture.
Por ejemplo, se producen ladrillos de magnesia-cromita o ladrillos de magnesia-espinela, que presentan módulos G de cizallamiento útiles, en el margen de 8 a 12 GPa (gigapascales).For example, bricks are produced from magnesia-chromite or bricks of magnesia-spinel, which have G modules of useful shear, in the range of 8 to 12 GPa (gigapascals)
Los ladrillos refractarios que contienen hercinita fundida o óxido de zirconio fundido como elastificante, presentan una pequeña elasticidad, son por el contrario, dúctiles. Los módulos G de aproximadamente 15 a 20 GPa son relativamente demasiado altos.The refractory bricks that contain molten hercinite or molten zirconium oxide as elastifier, they have a small elasticity, on the contrary, they are ductile. G modules of approximately 15 to 20 GPa are relatively too high
Estas conocidas piezas moldeadas, elastificadas, alcalinas, refractarias, se valoran en particular con respecto a su elasticidad, a la deseada formación de un revestimiento en un horno cilíndrico rotatorio, a la resistencia a las reacciones redox, a la estabilidad a los álcalis, a la estabilidad a la hidratación y a la capacidad de desecharlas, en donde cada una de estas conocidas piezas de moldeo tiene ventajas y desventajas con respecto a estas propiedades, las cuales vienen resumidas en la tabla siguiente:These known molded, elasticized pieces, alkaline, refractory, are valued in particular with respect to their elasticity, to the desired formation of a coating in a rotary cylindrical oven, resistance to reactions redox, to alkali stability, to stability to hydration and the ability to discard them, where each of These known molding parts have advantages and disadvantages with regarding these properties, which are summarized in the following table:
Los ladrillos de
magnesia-espinela y ladrillos de
magnesia-circonita forman una mezcla muy
difícilmente estable en el horno cilíndrico giratorio; en
consecuencia p. ej., pueden emplearse en la zona de sinterización
sólo muy limitadamente. Los ladrillos de
magnesia-hercinita presentan una buena formación de
la mezcla (ver "Variation of Physical and Chemical Parameters as
a Tool for the Development of Basis Refractory Bricks"
("Variación de parámetros físicos y químicos como una
herramienta para el desarrollo de ladrillos refractarios
alcalinos"); Klischat, Hans-Jurgen, Dr.; Weibel,
Guido -REFRATECHNIK GmbH, Alemania, en Unified International
Technical Conference on Refractories ("Conferencia técnica
internacional unificada sobre refractarios"), PROCEEDINGS
("Debates"), 6th Biennal World-wide Congress,
juntamente con el 42^{nd} International Colloquium on
Refractories ("42º coloquio internacional sobre refractarios"),
Refractories 2000, BERLIN - Alemania 6-9 Septiembre
1999, 50 Years German Refractory Association; páginas
204-207), pero sin embargo, presentan una mala
estabilidad redox así como a los álcalis. Lo mismo sucede en los
ladrillos de magnesia-cromita los cuales crean
además conocidos problemas al desecharlos. Los ladrillos de
dolomita que no contienen ningún elastificante garantizan no
obstante una muy buena formación del revestimiento, aunque no son
ni suficientemente alcalinos ni suficientemente resistentes a
la
hidratación.Magnesia-spinel bricks and magnesia-zirconia bricks form a very difficult stable mixture in the rotating cylindrical furnace; consequently p. For example, they can only be used in the sintering zone. Magnesia-Hercinite bricks have a good mixture formation (see "Variation of Physical and Chemical Parameters as a Tool for the Development of Basis Refractory Bricks") as a tool for the development of refractory bricks alkalis "); Klischat, Hans-Jurgen, Dr .; Weibel, Guido -REFRATECHNIK GmbH, Germany, at the Unified International Technical Conference on Refractories (PROBEDINGS), 6th Biennial World -wide Congress, together with the 42 ^ nd International Colloquium on Refractories ("42nd International Colloquium on Refractories"), Refractories 2000, BERLIN - Germany 6-9 September 1999, 50 Years German Refractory Association; pages 204-207), but nevertheless, they present a bad redox stability as well as to the alkalis. The same happens in magnesia-chromite bricks which also create known problems when discarded. Dolomite bricks that do not contain any elastifier nevertheless guarantee a very good coating formation, although they are neither sufficiently alkaline nor sufficiently resistant to
hydration.
La invención tiene como finalidad la creación de una pieza moldeada, refractaria, elastificada, alcalina, la cual presenta junto a un alto poder refractario y una buena estabilidad química, en particular una buena elasticidad y una buena capacidad de formación de revestimientos, así como una buena estabilidad redox, a los álcalis y a la hidratación, y puede ser desechada sin problemas.The invention aims at creating a molded, refractory, elastified, alkaline piece, which It presents with a high refractory power and good stability chemistry, in particular good elasticity and good capacity of coating formation, as well as good stability redox, alkalis and hydration, and can be discarded without problems.
Este problema se resuelve mediante las características de la reivindicación 1. Ventajosas distintas versiones de la invención se definen en las subreivindicaciones y las reivindicaciones subordinadas.This problem is solved by characteristics of claim 1. Different advantages versions of the invention are defined in the subclaims and the subordinate claims.
Según la invención, se emplea como resistor alcalino la magnesia sinterizada y/o la magnesia fundida así como la dolomita sinterizada y/o la dolomita fundida, escogidas de gran número de resistores conocidos. Como elastificante se descubrió el aluminato de calcio con la relación CaO/Al_{2}O_{3} entre 0,14 y 0,2, en particular con la composición química CaAl_{12}O_{19} con la fórmula oxídica CaO.6 Al_{2}O_{3} ó respectivamente la fórmula abreviada CA_{6}.According to the invention, it is used as a resistor alkaline sintered magnesia and / or molten magnesia as well as sintered dolomite and / or molten dolomite, chosen from large number of known resistors. As elastifier, the Calcium aluminate with the CaO / Al 2 O 3 ratio between 0.14 and 0.2, in particular with the chemical composition CaAl 12 O 19 with the oxidic formula CaO.6 Al 2 O 3 or respectively the abbreviated formula CA_ {6}.
El hexaluminato de calcio tiene la fórmula química CaAl_{12}O_{19} ó respectivamente el nombre mineral de "hibonita" y la fórmula oxídica CaO.6Al_{2}O_{3} ó respectivamente la fórmula abreviada CA_{6}.Calcium hexaluminate has the formula chemical CaAl_ {12} O_ {19} or respectively the mineral name of "hibonite" and the oxidic formula CaO.6Al_ {O2} or respectively the abbreviated formula CA_ {6}.
Obviamente, el Al_{2}O_{3} del CA_{6} no reacciona con los compuestos de metal alcalino y de calcio, p. ej., en el horno cilíndrico rotativo de cemento, puesto que ya está saturado con CaO. De esto resulta una muy buena estabilidad a la corrosión. Probablemente el CaO del CA_{6}, el cual está como componente principal en el material del klinker del cemento, cuida de la formación de un revestimiento muy efectivo en el horno cilíndrico de rotación, lo cual no puede lograrse incluso con piezas moldeadas formadoras de revestimiento, elastificadas, refractarias ya conocidas, como son los ladrillos de magnesia-hercinita o magnesia-cromita.Obviously, the Al_ {2} O_ {3} of the CA_ {6} does not reacts with alkali metal and calcium compounds, e.g. eg in the cement rotary cylindrical furnace, since it is already saturated with CaO. This results in a very good stability to the corrosion. Probably the CaO of CA_ {6}, which is like main component in the cement klinker material, care of the formation of a very effective coating in the oven cylindrical rotation, which cannot be achieved even with molded forming parts, elasticized, already known refractories, such as the bricks of magnesia-hercinite or magnesia-chromite.
El CA_{6} no es ningún desconocido entre los materiales refractarios. Es conocida una pieza moldeada refractaria, a partir de la patente DE 199 36 292 C2 cuyo componente oxídico mineral está formado por una cantidad de fases de minerales de \alpha-Al_{2}O_{3}, \beta-Al_{2}O_{3}, CA_{6} y CA_{2}. La cantidad de fases de minerales debe aumentar la estabilidad a la corrosión de la pieza moldeada. El CA_{6} no juega a este respecto ningún papel elastificante.CA_ {6} is no stranger among refractory materials A molded part is known refractory, from the patent DE 199 36 292 C2 whose mineral oxidic component is formed by a number of phases of α-Al 2 O 3 minerals, β-Al 2 O 3, CA 6 and CA 2. The amount of mineral phases should increase the stability to the corrosion of the molded part. CA_ {6} does not play this respect no elastifying paper.
La invención se aclara a continuación con más detalle a la vista del ejemplo de una versión:The invention is clarified below with more detail view of the example of a version:
Se mezclaron magnesia con un grano máximo de 4 mm y una distribución de granos correspondiente a una típica curva de Fuller, y el mineral hexaaluminato de calcio con una fracción de grano de 0,5 hasta 4 mm, con una cantidad necesaria de sulfonato de lignina como aglutinante, se moldearon en forma de ladrillos y se prensaron con una presión específica de 130 MPa. Después de un secado a 110ºC se cocieron los ladrillos en un horno de túnel a una temperatura de sinterización de 1600ºC.Magnesia was mixed with a maximum grain of 4 mm and a grain distribution corresponding to a typical curve of Fuller, and the mineral calcium hexaaluminate with a fraction of grain from 0.5 to 4 mm, with a necessary amount of sulphonate of lignin as a binder, they were molded in the form of bricks and they were pressed with a specific pressure of 130 MPa. After a dried at 110 ° C. the bricks were cooked in a tunnel oven at a sintering temperature of 1600 ° C.
Las propiedades conseguidas de los ladrillos cocidos como una función de la cantidad añadida de hexaaluminato de calcio están resumidas en la siguiente tabla 2. Para la comparación se empleó un ladrillo de magnesia cocido de la misma manera.The achieved properties of the bricks cooked as a function of the added amount of hexaaluminate of Calcium are summarized in the following table 2. For comparison a brick of cooked magnesia of the same was used way.
\vskip1.000000\baselineskip\ vskip1.000000 \ baselineskip
De la tabla 2 se deduce que los ladrillos según la invención para su utilización en un horno cilíndrico rotatorio de cemento con sus condiciones dinámicas de temperatura están suficientemente elastificados. Los módulos elásticos están dentro de un margen muy bueno. La estabilidad al cambio de temperaturas (TWE) es excelente.From table 2 it follows that the bricks according to the invention for use in a rotary cylindrical oven of cement with its dynamic temperature conditions are sufficiently elasticized. The elastic modules are within A very good margin. Temperature change stability (TWE) it's excellent.
El mecanismo que conduce a una muy buena
elastificación de los ladrillos no se ha determinado claramente
hasta el momento. Probablemente se trata de la formación de unas
grietas microscópicas entre la matriz de magnesia y el
hexaaluminato de calcio al cocer los ladrillos, causadas por la
diferencia de dilatación térmica entre ambos
materiales.The mechanism that leads to a very good elastification of the bricks has not been clearly determined so far. It is probably the formation of microscopic cracks between the matrix of magnesia and calcium hexaaluminate when the bricks are baked, caused by the difference in thermal expansion between the two
materials.
A partir de la siguiente tabla 3 se pueden ver las propiedades individuales importantes de las conocidas piezas moldeadas según la tabla 1 y las piezas moldeadas según la invención.From the following table 3 you can see the important individual properties of the known pieces molded according to table 1 and molded parts according to the invention.
\vskip1.000000\baselineskip\ vskip1.000000 \ baselineskip
\vskip1.000000\baselineskip\ vskip1.000000 \ baselineskip
\vskip1.000000\baselineskip\ vskip1.000000 \ baselineskip
(Tabla pasa a página siguiente)(Table goes to page next)
La tabla 3 muestra que todas las clases de ladrillos conocidos hasta aquí muestran propiedades importantes de aplicación claramente desventajosas. Por el contrario, los ladrillos de magnesia-CA_{6} según la invención tienen excepcionales buenas propiedades, como no se conocían en el conjunto de aplicaciones importantes.Table 3 shows that all kinds of Bricks known so far show important properties of Clearly disadvantageous application. On the contrary, the magnesia-CA6 bricks according to the invention they have exceptional good properties, as they were not known in the set of important applications.
Las piezas moldeadas según la invención pueden emplearse ventajosamente en todas las aplicaciones en donde tienen lugar fuertes diferencias de temperatura y donde se generan tensiones mecánicas y termomecánicas. Estas son por ejemplo las zonas de sinterización y zonas de transición del horno cilíndrico rotatorio de las industrias de ladrillos y de tierras, en particular la industria del cemento, cal, dolomita y magnesita, industria de metales férricos y no férricos así como depósitos de fundición y tratamientos de la industria del hierro o respectivamente acero y metales no férricos. Las piezas moldeadas según la invención muestran un excelente comportamiento en la aplicación con respecto a la estabilidad a la hidratación, a los álcalis, al redox y a la corrosión junto con la simultánea tendencia a una buena formación del revestimiento. También son superiores a los productos conocidos debido a las posibilidades de desecharlos sin problemas después de ser utilizados.The molded parts according to the invention can be used advantageously in all applications where they have place strong temperature differences and where they are generated mechanical and thermomechanical stresses. These are for example the sintering zones and transition zones of the cylindrical furnace Rotary of the brick and earth industries, in particularly the cement, lime, dolomite and magnesite industry, ferrous and non-ferrous metal industry as well as deposits of foundry and iron industry treatments or respectively steel and non-ferrous metals. Molded parts according to the invention show excellent behavior in the application with respect to hydration stability, to alkalis, redox and corrosion along with simultaneous tendency to a good coating formation. They are also superior to known products due to the possibilities of Discard them without problems after being used.
La elastificación de las piezas moldeadas alcalinas según la invención se puede lograr no solamente con hexaaluminato de calcio puro sino que en el hexaaluminato de calcio pueden estar también presentes fases secundarias con un contenido de hasta el 10% en masa, p. ej., SiO_{2} y/o TiO_{2} y/o Fe_{2}O_{3} y/o MgO. Además, el hexaaluminato de calcio actúa también según se ha descrito, cuando un 58% en masa del Al_{2}O_{3} se substituye por Fe_{2}O_{3} ó cuando el Ca^{2+} se substituye parcialmente por Ba^{2+} ó Sr^{2+}, como se describe en "Trojer, F.: Die oxydischen Kristallphasen der anorganischen Industrie-produkte" ("Fases oxídicas cristalinas de los productos inorgánicos de la industria"), E. Schweitzerbart'sche Verlagsbuchhandlung ("Librería editorial de Schweitzerbart"), Stuttgart 1963, página 272.Elasticization of molded parts alkalines according to the invention can be achieved not only with pure calcium hexaaluminate but in calcium hexaaluminate secondary phases may also be present with a content up to 10% by mass, p. e.g., SiO_ {2} and / or TiO_ {2} and / or Fe 2 O 3 and / or MgO. In addition, calcium hexaaluminate acts also as described, when 58% by mass of Al_ {2} O_ {3} is replaced by Fe_ {2} O_ {3} or when the Ca 2+ is partially replaced by Ba 2+ or Sr 2+, as described in "Trojer, F .: Die oxydischen Kristallphasen der anorganischen Industrie-produkte "(" Phases crystalline oxides of the inorganic products of the industry "), E. Schweitzerbart'sche Verlagsbuchhandlung ("Schweitzerbart Publishing Library"), Stuttgart 1963, page 272.
Claims (28)
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200550036A ES2273605B2 (en) | 2003-09-29 | 2003-09-29 | MOLDED PIECE OF INDUSTRIAL CERAMICS, PROCEDURE FOR OBTAINING AND EMPLOYMENT. |
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