ES2289914B2 - PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III. - Google Patents

PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III. Download PDF

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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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Prior art keywords
stage
product
anhydrite iii
procedure
temperature
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Expired - Fee Related
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ES200600084A
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Spanish (es)
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ES2289914A1 (en
Inventor
Christian Palacios Gazules
Jose Maria Palacios Gazules
Sergio Palacios Gazules
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Priority to ES200600084A priority Critical patent/ES2289914B2/en
Priority to ES200601612A priority patent/ES2289931B2/en
Priority to PCT/ES2006/070195 priority patent/WO2007080202A2/en
Priority to EP06841802A priority patent/EP2025652A2/en
Publication of ES2289914A1 publication Critical patent/ES2289914A1/en
Priority to MA31162A priority patent/MA30211B1/en
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Publication of ES2289914B2 publication Critical patent/ES2289914B2/en
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    • 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

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  • 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

Objeto de la invenciónObject of the invention

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.

Antecedentes de la invenciónBackground of the invention

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%.

Descripción de la invenciónDescription of the invention

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.

Realización preferente de la invenciónPreferred Embodiment of the Invention

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)

1. Procedimiento de obtención de anhidrita III estabilizada que comprende las etapas de:1. Procedure for obtaining anhydrite III stabilized comprising the stages of: Calcinación del sulfato de yeso micronizado a una temperatura entre 180-340ºCCalcination of micronized gypsum sulfate a a temperature between 180-340 ° C Enfriamiento a temperatura ambiente del producto obtenido en la calcinación de la primera etapaCooling at room temperature of the product  obtained in the calcination of the first stage 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. 2. Procedimiento de obtención según la reivindicación 1ª caracterizado porque en la etapa de enfriamiento se controla la humedad del producto.2. Method of obtaining according to claim 1 characterized in that in the cooling stage the humidity of the product is controlled. 3. Procedimiento de obtención según la reivindicación 2ª caracterizado porque la temperatura a la que se eleva el producto en la tercera etapa se encuentra entre los 200-450ºC.3. Method of obtaining according to claim 2 characterized in that the temperature at which the product rises in the third stage is between 200-450 ° C. 4. Procedimiento según reivindicación 1ª caracterizado porque tras la etapa de enfriamiento se recubren las partículas de una capa fina de aditivos.4. Method according to claim 1 characterized in that after the cooling stage the particles of a thin layer of additives are coated.
ES200600084A 2006-01-13 2006-01-13 PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III. Expired - Fee Related ES2289914B2 (en)

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.
PCT/ES2006/070195 WO2007080202A2 (en) 2006-01-13 2006-12-14 Method for obtaining stabilised anhydrite iii
EP06841802A EP2025652A2 (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

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ES200600084A Expired - Fee Related ES2289914B2 (en) 2006-01-13 2006-01-13 PROCEDURE FOR OBTAINING STABILIZED ANHYDRITE III.

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Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2767815A1 (en) * 1997-08-27 1999-02-26 Jean Couturier Stable alpha anhydrite-rich hydraulic binder

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