DE1019954B - Process for the production of a binder from synthetic anhydrite - Google Patents

Process for the production of a binder from synthetic anhydrite

Info

Publication number
DE1019954B
DE1019954B DEB41175A DEB0041175A DE1019954B DE 1019954 B DE1019954 B DE 1019954B DE B41175 A DEB41175 A DE B41175A DE B0041175 A DEB0041175 A DE B0041175A DE 1019954 B DE1019954 B DE 1019954B
Authority
DE
Germany
Prior art keywords
production
binder
synthetic anhydrite
hydrofluoric acid
properties
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.)
Pending
Application number
DEB41175A
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BADISCHE BAU und KUNSTSTOFF G
Original Assignee
BADISCHE BAU und KUNSTSTOFF G
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BADISCHE BAU und KUNSTSTOFF G filed Critical BADISCHE BAU und KUNSTSTOFF G
Priority to DEB41175A priority Critical patent/DE1019954B/en
Publication of DE1019954B publication Critical patent/DE1019954B/en
Pending legal-status Critical Current

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
    • C04B11/00—Calcium sulfate cements
    • C04B11/05—Calcium sulfate cements obtaining anhydrite, e.g. Keene's cement

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Description

Verfahren zur Herstellung eines Binders aus synthetischem Anhydrit Es ist bekannt, die im wesentlichen aus Calciumsulfat bestehenden Rückstände der Flußsäurefabrikation,, vermahlen und mit Wasser zu plastischen l.lassen angeteigt, als Material zur Herstellung von Estrichen, Putzen od. dgl. zu verwenden. B,e!deutsam für den wirtschaftlichen Einsatz dieser Produkte ist die Gleichmäßigkeit der Eigenschaften, wie Abbindezeit, Druckfestigkeit, Oberflächenhärte und Volumenbeständigkeit der aus ihnen hergestellten Bauelemente.Process for the production of a binder from synthetic anhydrite It is known that the residues consisting essentially of calcium sulfate Hydrofluoric acid production, ground and made into a paste with water to form plastic oil, As a material for the production of screeds, plasters or the like. To use. B, e! Meaningful for the economic use of these products is the uniformity of the properties, such as setting time, compressive strength, surface hardness and volume stability of the components made from them.

Es wurde nun gefunden, daß man Schwankungen der genannten Eigenschaften dadurch vermeiden kann, daß man bei der Ausgasung der Flußisäure aus dem Flußspat die kritische Temperatur von 270° C nicht überschreitet. Oberhalb dieser Temperatur erleidet der im wesentlichen aus Calciumsulfat bestehende Rückstand eine Veränderung, die sich ungünstig auf die Eigenschaften der damit hergestellten Bauelemente auswirkt.It has now been found that there are fluctuations in the properties mentioned this can avoid the need for outgassing the hydrofluoric acid from the fluorspar does not exceed the critical temperature of 270 ° C. Above this temperature if the residue, which consists essentially of calcium sulphate, suffers a change, which has an unfavorable effect on the properties of the components manufactured with it.

Bei der Ausgasung der Flußsäure arbeitet man im allgemeinen bei Temperaturen um 300° C. Die Beschränkung auf die Temperatur von 270° C führt zü ]<einer wesentlichen Verlängerung der Ausgasungsze@i.t oder Erhöhung der aufzuwendenden Heizenergie, wohl aber zu einem gleichmäßigen Binder mit wesentlich verbesserten Eigenschaften.When the hydrofluoric acid is outgassed, temperatures are generally used around 300 ° C. The restriction to the temperature of 270 ° C leads to an essential Extension of the Ausgasungsze@i.t or increase of the heating energy to be used, but it does result in a uniform binder with significantly improved properties.

Die Rückstände einer Ausgasung bei 270° C (I) und einer zweiten bei 310° C (II), beide in gleicher Weise mit einem 2o/oigen Überschuß an Ätzkalk versetzt, in einer Kugelmühle auf 3 % Rückstand auf einem 70er-Sieb mit -1900 Maschen/cm2 gemahlen und mit 21 II/o Wasser angeteigt, zeigten schon beim Abbinden Unterschiede, indem bei dem weniger erhitzten Produkt der Abbindebeginn bei -11/4 Stunden, bei dem anderen Binder bei 71/z Stunden lag. Nach 28 Tagen ergaben sich Druckfestigkeiten von 412 kg/cm2 (I) und 280 kg/cm2 (II). Besonders unterschiedlich war das Verhalten bei Wasserlagerung von in gleicher Weise hergestellten Probetafeln. Nach 3tägiger Wasserlagerung ließ sich die Oberfläche von II verhältnismäßig leicht mit dem Fingernagel ritzen, während das Muster I sich als nahezu sitzfest erwies.The residues of an outgassing at 270 ° C (I) and a second at 310 ° C (II), both mixed in the same way with a 20% excess of quicklime, in a ball mill to 3% residue on a 70 sieve with -1900 mesh / cm2 ground and made into a paste with 21 II / o water, showed differences already during setting, in that the less heated product begins to set at -11/4 hours, at the other binder was 71 / z hours. Compressive strengths were found after 28 days of 412 kg / cm2 (I) and 280 kg / cm2 (II). The behavior was particularly different if test panels produced in the same way are stored in water. After 3 days Water immersion made the surface of II relatively easy with a fingernail scratch, while the pattern I proved to be almost firmly seated.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Binders aus den im wesentlichen aus Ca S 04 bestehenden Rückständen der Flußsäurefabrikation" dadurch gekennzeichnet, daß die Flußsäureausgasung bei Temperaturen durchgeführt wird, die 270° C nicht übersteigen.PATENT CLAIM: Process for the production of a binder from the im substantial residues of the hydrofluoric acid production consisting of Ca S 04 "thereby characterized in that the hydrofluoric acid degassing is carried out at temperatures which Do not exceed 270 ° C.
DEB41175A 1956-07-26 1956-07-26 Process for the production of a binder from synthetic anhydrite Pending DE1019954B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB41175A DE1019954B (en) 1956-07-26 1956-07-26 Process for the production of a binder from synthetic anhydrite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB41175A DE1019954B (en) 1956-07-26 1956-07-26 Process for the production of a binder from synthetic anhydrite

Publications (1)

Publication Number Publication Date
DE1019954B true DE1019954B (en) 1957-11-21

Family

ID=6966308

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB41175A Pending DE1019954B (en) 1956-07-26 1956-07-26 Process for the production of a binder from synthetic anhydrite

Country Status (1)

Country Link
DE (1) DE1019954B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2588851A1 (en) * 1985-10-17 1987-04-24 Jouve Jean Process for the manufacture of anhydrite and plant for its implementation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2588851A1 (en) * 1985-10-17 1987-04-24 Jouve Jean Process for the manufacture of anhydrite and plant for its implementation

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