ES2289914B2 - PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III. - Google Patents
PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III. Download PDFInfo
- Publication number
- ES2289914B2 ES2289914B2 ES200600084A ES200600084A ES2289914B2 ES 2289914 B2 ES2289914 B2 ES 2289914B2 ES 200600084 A ES200600084 A ES 200600084A ES 200600084 A ES200600084 A ES 200600084A ES 2289914 B2 ES2289914 B2 ES 2289914B2
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- ES
- Spain
- Prior art keywords
- stage
- product
- anhydrite iii
- procedure
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title claims abstract description 22
- 229910052925 anhydrite Inorganic materials 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 239000000654 additive Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 229910052602 gypsum Inorganic materials 0.000 claims description 2
- 239000010440 gypsum Substances 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 239000006227 byproduct Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 4
- 239000011505 plaster Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 2
- 150000004683 dihydrates Chemical class 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Glanulating (AREA)
Abstract
Procedimiento de obtención de anhidrita III estabilizada, que comprende una primera etapa de calentamiento de sulfato de calcio natural o subproductos de éste, una segunda etapa de enfriamiento, y una tercera etapa de calentamiento en un orden de segundos.Process for obtaining stabilized anhydrite III, which comprises a first stage of heating of natural calcium sulfate or by-products thereof, a second stage of cooling, and a third stage of heating in an order of seconds.
Description
Procedimiento de obtención de anhidrita III estabilizada.Procedure for obtaining anhydrite III stabilized
La presente invención se refiere a un procedimiento de obtención de la anhidrita III estabilizada.The present invention relates to a procedure for obtaining stabilized anhydrite III.
La anhidrita III es un producto muy inestable y tiende a transformarse inmediatamente en alguna de las formas de sulfato de calcio hidratadas, como el hemihidrato o el dihidrato.Anhydrite III is a very unstable product and it tends to transform immediately into one of the ways of hydrated calcium sulfate, such as hemihydrate or dihydrate
Sin embargo es muy interesante la estabilización de dicha anhidrita III, debido a las características de la misma: puede fraguar rápidamente y alcanza una resistencia muy alta en un espacio corto de tiempo.However, stabilization is very interesting of said anhydrite III, due to its characteristics: it can set quickly and reaches a very high resistance in a short space of time.
Son conocidos procedimientos para estabilizar la anhidrita III como el descrito en la patente de invención FR2767816, donde el producto inicial se eleva a una temperatura de 220-350ºC, y posteriormente se enfría.Procedures for stabilizing the anhydrite III as described in the invention patent FR2767816, where the initial product rises to a temperature of 220-350 ° C, and subsequently cooled.
La presente invención se refiere a un procedimiento para la estabilización de la anhidrita, al encapsular la misma dentro de una corteza soluble o ligeramente soluble con una capacidad de absorción de agua entre el 0-12%.The present invention relates to a anhydrite stabilization procedure, when encapsulating the same within a soluble or slightly soluble crust with a water absorption capacity between 0-12%.
La presente invención se refiere a un procedimiento de obtención de anhidrita III estabilizada.The present invention relates to a procedure for obtaining stabilized anhydrite III.
El producto de partida es yeso micronizado, es decir, sulfato de calcio natural o subproductos de éste, a partir del cual se obtiene tras el procedimiento de la invención anhidrita III estabilizada.The starting product is micronized plaster, it is that is, natural calcium sulfate or its by-products, from which is obtained after the process of the invention anhydrite III stabilized.
En una primera etapa, se calcina el yeso micronizado, es decir, se somete el yeso a altas temperaturas 180º-340ºC durante un corto espacio de tiempo, del orden de segundos.In a first stage, the plaster is calcined micronized, that is, the plaster is subjected to high temperatures 180º-340ºC for a short time, of the order of seconds.
Al elevar la temperatura en este rango se obtiene a partir de las partículas de sulfato de calcio, anhidrita III.By raising the temperature in this range you obtained from the particles of calcium sulfate, anhydrite III.
En una segunda etapa del procedimiento se enfría el producto obtenido en la primera etapa a temperatura ambiente.In a second stage of the procedure it cools the product obtained in the first stage at temperature ambient.
En una tercera etapa se vuelve a calentar el producto en un rango de temperaturas entre 200-700ºC durante un tiempo del orden de segundos.In a third stage, the product in a temperature range between 200-700ºC for a time of the order of seconds.
Opcionalmente tras la primera etapa de calentamiento el producto se somete a una hidratación controlada o a una adición de aditivos.Optionally after the first stage of heating the product undergoes controlled hydration or An addition of additives.
En una realización preferente de la invención se calcina el sulfato de yeso micronizado a una temperatura entre 180-340ºC.In a preferred embodiment of the invention, calcine the micronized gypsum sulfate at a temperature between 180-340 ° C.
La siguiente etapa de enfriamiento se realiza por un sistema de sinfines.The next stage of cooling is performed for a system of augers.
Los componentes de los sinfines son de aleaciones que soporten altas temperaturas, en el tramo final donde el material ya ha sido enfriado los materiales del sinfín pueden ser estándar.The components of the augers are of alloys that withstand high temperatures, in the final section where the material has already been cooled the auger materials can be standard
Para evitar el contacto no controlado con el agua, el sinfín puede encontrarse sellado, de manera que no se permita el contacto del material con el exterior.To avoid uncontrolled contact with the water, the auger can be sealed, so that it is not allow the contact of the material with the outside.
Una vez que la anhidrita III halla terminado su paso por los sinfines, se procede a elevar la temperatura por segunda vez, entre los 200-700ºC durante un tiempo del orden de segundos, de manera que se forma una corteza exterior de anhidrita II soluble o ligeramente soluble con una capacidad de absorción de agua entre el 0 y el 12%.Once anhydrite III has finished its step through the augers, the temperature is raised by second time, between 200-700 ° C for a while on the order of seconds, so that an outer crust is formed of soluble or slightly soluble anhydrite II with a capacity of water absorption between 0 and 12%.
Al utilizarse un sistema de calentamiento muy rápido, en el centro de la partícula se sigue conservando un porcentaje mayoritario de anhidrita III soluble.When using a very hot heating system fast, in the center of the particle is still retaining a Major percentage of soluble anhydrite III.
En un segundo ejemplo de realización, es posible antes de realizar esta segunda etapa de calentamiento, hacer pasar el producto en el sinfín, por un circuito de humedad controlada con objeto de que se forme una pequeña película exterior de hemihidrato o dihidrato.In a second embodiment, it is possible before performing this second heating stage, pass the product in the auger, by a humidity circuit controlled with object to form a small outer film of hemihydrate or dihydrate
Posteriormente igual que en el caso anterior se somete el producto con la película exterior hidratada a una segunda etapa de calentamiento, formándose una película exterior de yeso fraguado. En este segundo ejemplo de realización la temperatura en esta etapa de calentamiento es de 200-450ºC.Subsequently, as in the previous case, subject the product with the hydrated outer film to a second heating stage, forming an outer plaster film setting. In this second embodiment the temperature in This heating stage is 200-450 ° C.
En un tercer ejemplo de realización, tras salir el producto del sinfín, se hace pasar el producto por un circuito corto donde se recubren las partículas de una capa fina de aditivos.In a third embodiment, after leaving the endless product, the product is passed through a circuit short where the particles of a thin layer of additives
Al introducir el producto en la segunda etapa de calentamiento se forma una capa exterior recubierta de aditivo endurecida, y la anhidrita III queda encapsulada.When introducing the product in the second stage of heating forms an outer layer coated with additive hardened, and anhydrite III is encapsulated.
No alteran la esencialidad de esta invención variaciones en materiales, forma, tamaño y disposición de los elementos componentes, descritos de manera no limitativa, bastando ésta para proceder a su reproducción por un experto.They do not alter the essentiality of this invention variations in materials, shape, size and arrangement of component elements, described in a non-limiting manner, sufficient this one to proceed to its reproduction by an expert.
Claims (4)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200600084A ES2289914B2 (en) | 2006-01-13 | 2006-01-13 | PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III. |
ES200601612A ES2289931B2 (en) | 2006-01-13 | 2006-06-15 | IMPROVEMENTS INTRODUCED IN MAIN PATENT P200600084 CONCERNING A PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III. |
EP06841802A EP2025652A2 (en) | 2006-01-13 | 2006-12-14 | Method for obtaining stabilised anhydrite iii |
PCT/ES2006/070195 WO2007080202A2 (en) | 2006-01-13 | 2006-12-14 | Method for obtaining stabilised anhydrite iii |
MA31162A MA30211B1 (en) | 2006-01-13 | 2008-08-07 | PROCESS FOR OBTAINING STABILIZED ANHYDRITE III |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200600084A ES2289914B2 (en) | 2006-01-13 | 2006-01-13 | PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III. |
Publications (2)
Publication Number | Publication Date |
---|---|
ES2289914A1 ES2289914A1 (en) | 2008-02-01 |
ES2289914B2 true ES2289914B2 (en) | 2008-08-16 |
Family
ID=38961551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES200600084A Expired - Fee Related ES2289914B2 (en) | 2006-01-13 | 2006-01-13 | PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III. |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES2289914B2 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2767815A1 (en) * | 1997-08-27 | 1999-02-26 | Jean Couturier | Stable alpha anhydrite-rich hydraulic binder |
-
2006
- 2006-01-13 ES ES200600084A patent/ES2289914B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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ES2289914A1 (en) | 2008-02-01 |
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