AT125239B - Process for the production of white cement from colored, e.g. B. ferrous raw materials. - Google Patents

Process for the production of white cement from colored, e.g. B. ferrous raw materials.

Info

Publication number
AT125239B
AT125239B AT125239DA AT125239B AT 125239 B AT125239 B AT 125239B AT 125239D A AT125239D A AT 125239DA AT 125239 B AT125239 B AT 125239B
Authority
AT
Austria
Prior art keywords
raw materials
colored
production
white cement
iron
Prior art date
Application number
Other languages
German (de)
Original Assignee
Miag Muehlenbau & Ind Ag
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 Miag Muehlenbau & Ind Ag filed Critical Miag Muehlenbau & Ind Ag
Application granted granted Critical
Publication of AT125239B publication Critical patent/AT125239B/en

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
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • C04B7/42—Active ingredients added before, or during, the burning process
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0096—Reducing agents
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Herstellung von weissem Zement aus gefärbten, z. B. eisenhaltigen
Rohstoffen. 



   Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von weissem Zement aus gefärbten, z. B. eisenhaltigen Rohstoffen, nach dem man die Rohstoffe, gegebenenfalls unter Beifügung von Koks oder Reduktionsmitteln in bekannter Weise reduzierend brennt, die entstandenen Klinker zerkleinert und das metallische Eisen durch eine an sich bekannte Scheidung entfernt. 



   Die Erfindung besteht darin, dass man die zerkleinerten und von Eisen befreiten, nach diesem bekannten Verfahren erhaltenen Klinker bei Anwesenheit von Luft, Sauerstoff oder Oxydationsmitteln oxydiert. 



   Das neue Verfahren weist dem Bekannten gegenüber den Vorteil auf, dass es sich ohne weiteres auf alte Rohstoffe anwenden lässt, deren Gehalt an Eisen gross oder klein ist. 



   Beispielweise werden die üblichen Zementrohstoffe im Gemisch mit   6%   Koks im Drehofen gesintert oder geschmolzen. Bei Erreichung einer Temperatur von 700 bis   9000 C   werden die Eisenoxyde in der entstehenden   Kohlenoxydatmosphäre   zu Metall reduziert, das in Form feiner Flitter oder Kügelchen in dem erhaltenen Klinker verbleibt. Nach der Zerkleinerung der Klinker werden die Metallteile mit Hilfe eines Magneten herausgelesen und sodann gemäss der Erfindung die gepulverte Klinkermasse etwa eine halbe Stunde auf etwa 500  C unter Luftzutritt erhitzt. Dabei verbrennt der etwa vorhandene   überschüssige   Koks, und das durch die Schwefelbeimengungen des Brennstoffes entstandene   Schwefelkalzil1m   wird in unschädlichen Gips übergeführt.

   Den Zementrohstoffen kann man natürlich auch noch Flussmittel zur Herabsetzung der Sintertemperatur hinzusetzen. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Process for the production of white cement from colored, e.g. B. ferrous
Raw materials.



   The invention relates to a process for the production of white cement from colored, e.g. B. iron-containing raw materials, after which the raw materials, optionally with the addition of coke or reducing agents, burns reducing in a known manner, the resulting clinker crushed and the metallic iron removed by a known separation.



   The invention consists in that the crushed and iron-free clinker obtained by this known method is oxidized in the presence of air, oxygen or oxidizing agents.



   The new method has the advantage over the familiar that it can be easily applied to old raw materials whose iron content is large or small.



   For example, the usual cement raw materials are sintered or melted in a mixture with 6% coke in a rotary kiln. When a temperature of 700 to 9000 C is reached, the iron oxides are reduced to metal in the resulting carbon dioxide atmosphere, which remains in the clinker obtained in the form of fine flakes or globules. After the clinker has been comminuted, the metal parts are read out with the aid of a magnet and then, according to the invention, the powdered clinker mass is heated for about half an hour to about 500 ° C. with admission of air. Any excess coke that may be present burns up, and the calcium sulphide produced by the sulfur admixtures in the fuel is converted into harmless gypsum.

   Of course, flux can also be added to the cement raw materials to reduce the sintering temperature.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Verfahren zur Herstellung von weissem Zement aus gefärbten, z. B. eisenhaltigen Rohstoffen, nach dem man die Rohstoffe, gegebenenfalls unter Beifügung von Koks oder Reduktionsmitteln, reduzierend brennt, die entstandenen Klinker zerkleinert und das metallische Eisen durch eine an sich bekannte Scheidung entfernt, dadurch gekennzeichnet, dass man die vom Eisen befreiten zerkleinerten Klinker oxydiert. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Process for the production of white cement from colored, e.g. B. iron-containing raw materials, after which the raw materials, optionally with the addition of coke or reducing agents, burns reducing, the resulting clinker is crushed and the metallic iron is removed by a known separation, characterized in that the iron-freed crushed clinker is oxidized . ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT125239D 1929-09-25 1930-05-08 Process for the production of white cement from colored, e.g. B. ferrous raw materials. AT125239B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE125239X 1929-09-25

Publications (1)

Publication Number Publication Date
AT125239B true AT125239B (en) 1931-11-10

Family

ID=5658589

Family Applications (1)

Application Number Title Priority Date Filing Date
AT125239D AT125239B (en) 1929-09-25 1930-05-08 Process for the production of white cement from colored, e.g. B. ferrous raw materials.

Country Status (1)

Country Link
AT (1) AT125239B (en)

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