DE3707812A1 - Process for producing a dihydrate moulded article from a-hemihydrate mortar of variable bulk density - Google Patents
Process for producing a dihydrate moulded article from a-hemihydrate mortar of variable bulk densityInfo
- Publication number
- DE3707812A1 DE3707812A1 DE19873707812 DE3707812A DE3707812A1 DE 3707812 A1 DE3707812 A1 DE 3707812A1 DE 19873707812 DE19873707812 DE 19873707812 DE 3707812 A DE3707812 A DE 3707812A DE 3707812 A1 DE3707812 A1 DE 3707812A1
- Authority
- DE
- Germany
- Prior art keywords
- mortar
- mass
- hemihydrate
- subsequent
- gypsum
- 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.)
- Ceased
Links
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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Verwertung der Abgänge aus der Herstellung von Phosphorsäure aus Phosphaten, die als Phosphogips aus dem Produktionsprozeß anfallen.The invention relates to a method for recycling the exits from the production of phosphoric acid from phosphates, which as Phosphogypsum from the production process.
Das Verfahren nutzt die Eigenart der Phosphogipse, die aus der Umsetzung der Phosphate zu Phospho-Pentoxyd als a-Halbhydrat in heißem Zustand anfallen und über Auskühlen ein Gips-Dihydrat er geben.The process uses the peculiarity of the phosphogypsum, which results from the Conversion of the phosphates to phosphopentoxide as a hemihydrate in hot condition and a gypsum dihydrate over cooling give.
In großen Mengen anfallende Abgänge, die Phosphogipse, werden über wiegend deponiert oder in Meere verschüttet, da die Phosphat-Wer ke im wesentlichen in Küstennähe errichtet werden.Waste that occurs in large quantities, the phosphogypsum, is over mostly landfilled or spilled into oceans because of the phosphate-who ke be built essentially near the coast.
Als Beispiel sei hier genannt, daß allein im Mittelmeerraum Milli onen t/anno an Phosphogips anfallen, dort haldiert oder ins Meer verschüttet werden müssen.As an example, it should be mentioned here that in the Mediterranean region alone onen t / anno accumulate in phosphogypsum, stored there or into the sea have to be spilled.
Nach dem hier entwickelten Verfahren sollen die aus dem Prozeß der Phosphorsäure-Herstellung in heißem Zustande anfallenden a-Halb hydrate aus der Fertigung direkt übernommen und zu einem a-Halb hydrat-Mörtel zusammen mit anorganischen Feinkorn-Zuschlag verar beitet werden. According to the procedure developed here, those from the process of Production of phosphoric acid in the hot state a-half hydrates taken directly from production and a half Process hydrate mortar together with inorganic fine grain aggregate be prepared.
Als Feinkorn kann natürlicher oder künstlicher Zuschlagstoff mit dichtem oder porigem Gefüge, wie z. B. auch Bims, hydrophobiert, verwendet werden.Natural or artificial aggregate can be used as fine grain dense or porous structure, such as. B. also pumice, hydrophobic, be used.
Vor dem Einsatz des Feinkorns in die Masse des a-Halbhydrates muß das anorganische Feinkorn in der Temperatur dem a-Halbhydrat angeglichen werden oder so überhöht erhitzt sein, so daß eine Aus kühlung des Halbhydrates nicht möglich ist.Before using the fine grain in the mass of the a hemihydrate the temperature of the inorganic fine grain must be that of the a hemihydrate be adjusted or so heated to excessive, so that an off cooling of the hemihydrate is not possible.
Verfahrenstechnisch wird das a-Halbhydrat, die Aufbereitung des Feinkorns sowie die Herstellung des Mörtels in Vorrichtungen durch geführt, die in dem Anlagenbau der Firmen und in der Ausführung be kannt sind. Firmen des Anlagebaus können daher aus eigener Pro duktion für die Fertigung entsprechende Vorrichtungen liefern.The a-hemihydrate, the processing of the Fine grain and the production of the mortar in devices managed, be in the plant construction of the companies and in the execution are known. Plant construction companies can therefore use their own pro Production to provide appropriate devices for manufacturing.
Wesentlich ist, daß der Mörtel in einer solchen Konsistens erstellt und auch gehalten wird, daß der Mörtel für die Formgebung entweder verpreßt oder gegossen werden kann.It is essential that the mortar is created in such a consistency and it is also kept that the mortar for shaping either can be pressed or poured.
Die in Formen verarbeitete Mörtelmasse einer Kühlung zugeführt, setzt sich zu einem Dihydrat um, erhält die Festigkeit eines Gipssteines.The mortar mass processed in molds, cooled, sets turning into a dihydrate maintains the strength of a gypsum stone.
Über die Wahl des anorganischen Zuschlages zum Mörtel und durch die Aufbereitung der Mörtelmasse, bestimmt sich die Rohdichte des aus gekühlten Formgutes.About the choice of the inorganic addition to the mortar and through the Preparation of the mortar mass, determines the bulk density of the chilled molded goods.
Mit dem a-Halbhydrat-Mörtel hergestelltes und der Auskühlung ausge setztes Formgut kann als Vollstein in Normalformat oder als Block stein an die Bauindustrie geliefert werden. Die Formung ist freige stellt, da im Guß- oder Preßverfahren beliebige Formgebung möglich ist. Die Anwendung des Fertiggutes muß dem Baumarkt angepaßt werden. Die Nutzung dieses Verfahrens wird sich vorrangig dort ergeben, wo Phosphogipse anfallen, die Herstellung kostengünstiger, ein facher Steine oder Bauelemente das Bauvolumen ausfüllen kann. Hierzu gehören Gegenden mit einer hohen Bevölkerungsexplosion, in welchen ein großes Bauvolumen vorliegt.Made with the a-hemihydrate mortar and cooled down Set material can be used as a solid block in normal format or as a block stone can be delivered to the construction industry. The formation is free represents, since any shape possible in the casting or pressing process is. The use of the finished goods must be adapted to the hardware store. The use of this method will primarily arise there where there are phosphogypses, the production is cheaper multiple stones or components can fill the construction volume. These include areas with a high population explosion, in which there is a large construction volume.
Die Erfindung, die über die Nutzung der Phosphogipse verfahrens technisch ausgelegt wurde, läßt sich auf alle Abfallgipse über tragen. Somit sind die REA-Gipse und sonstige Chemiegipse in das Verfahren einzuschließen, insbesondere dann, wenn im auto klavfreien Verfahren die Herstellung des a-Halbhydrates kosten günstig aus diesen Abfallgipsen hergestellt werden kann.The invention, the process of using the phosphogypsum was technically designed, can be applied to all waste gypsum wear. The REA gypsum and other chemical gypsum are therefore in to include the procedure, especially if in the car claveless processes cost the production of the a-hemihydrate can be produced cheaply from these gypsum plaster.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873707812 DE3707812A1 (en) | 1987-03-11 | 1987-03-11 | Process for producing a dihydrate moulded article from a-hemihydrate mortar of variable bulk density |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873707812 DE3707812A1 (en) | 1987-03-11 | 1987-03-11 | Process for producing a dihydrate moulded article from a-hemihydrate mortar of variable bulk density |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3707812A1 true DE3707812A1 (en) | 1988-09-22 |
Family
ID=6322783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19873707812 Ceased DE3707812A1 (en) | 1987-03-11 | 1987-03-11 | Process for producing a dihydrate moulded article from a-hemihydrate mortar of variable bulk density |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3707812A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104030649A (en) * | 2014-06-09 | 2014-09-10 | 中国地质大学(武汉) | Production process for high-strength high-volume phosphogypsum baking-free brick |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2225817A1 (en) * | 1972-05-26 | 1973-12-06 | Kuenkele Gipswerk | Beta-calcium sulphate semi-hydrate prodn - by calcining calcium sulphate dihydrate and passing the gases over anhydrite |
DE2317049A1 (en) * | 1973-04-05 | 1974-10-24 | Salzgitter Ind | PROCESS FOR PRODUCING MOLDED BODIES FROM CALCIUM SULPHATE HALBYDRATE |
EP0169508A2 (en) * | 1984-07-24 | 1986-01-29 | B.V. Projectbureau voor Industrieel Afval, P.B.I. | Building material from phosho-hemihydrate, process for its production and its use |
-
1987
- 1987-03-11 DE DE19873707812 patent/DE3707812A1/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2225817A1 (en) * | 1972-05-26 | 1973-12-06 | Kuenkele Gipswerk | Beta-calcium sulphate semi-hydrate prodn - by calcining calcium sulphate dihydrate and passing the gases over anhydrite |
DE2317049A1 (en) * | 1973-04-05 | 1974-10-24 | Salzgitter Ind | PROCESS FOR PRODUCING MOLDED BODIES FROM CALCIUM SULPHATE HALBYDRATE |
EP0169508A2 (en) * | 1984-07-24 | 1986-01-29 | B.V. Projectbureau voor Industrieel Afval, P.B.I. | Building material from phosho-hemihydrate, process for its production and its use |
Non-Patent Citations (1)
Title |
---|
ULLMANN: Encyklopädie der technischen Chemie, 4. Aufl., Bd. 18, 1979, S. 313-316 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104030649A (en) * | 2014-06-09 | 2014-09-10 | 中国地质大学(武汉) | Production process for high-strength high-volume phosphogypsum baking-free brick |
CN104030649B (en) * | 2014-06-09 | 2017-02-01 | 中国地质大学(武汉) | Production process for high-strength high-volume phosphogypsum baking-free brick |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8131 | Rejection |