DE531416C - Process for the production of white cement from colored, e.g. ferrous raw materials - Google Patents

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

Info

Publication number
DE531416C
DE531416C DEM112000D DEM0112000D DE531416C DE 531416 C DE531416 C DE 531416C DE M112000 D DEM112000 D DE M112000D DE M0112000 D DEM0112000 D DE M0112000D DE 531416 C DE531416 C DE 531416C
Authority
DE
Germany
Prior art keywords
raw materials
production
colored
white cement
ferrous raw
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.)
Expired
Application number
DEM112000D
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.)
"miag" Muehlenbau und Industrie Akt-Ges
Original Assignee
"miag" Muehlenbau und Industrie Akt-Ges
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 und Industrie Akt-Ges filed Critical "miag" Muehlenbau und Industrie Akt-Ges
Priority to DEM112000D priority Critical patent/DE531416C/en
Application granted granted Critical
Publication of DE531416C publication Critical patent/DE531416C/en
Expired 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
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)

Description

Verfahren zur Herstellung von weißem Zement aus gefärbten, z. B. eisenhaltigen Rohstoffen Es ist in der Zementindustrie eine bekannte Erfahrungstatsache, daß das reduzierende Brennen des Zementrohmehls schädlich ist. Deshalb sorgt man durch einen geringen Überschuß von Luft beim Brennen von Zement stets dafür; daß eine Reduktion überhaupt nicht eintreten kann.Process for the production of white cement from colored, e.g. B. ferrous Raw materials It is a well known fact of experience in the cement industry that the reducing burning of the cement raw meal is detrimental. That is why one cares through one a small excess of air when burning cement is always in favor; that a reduction cannot occur at all.

Gemäß der Erfindung wird der reduzierende Brand der Zementrohstoffe zur Herstellung von weißem Zement absichtlich herbeigeführt, um das in diesen Stoffen enthaltene Eisenoxyd in metallisches Eisen umzuwandeln, damit dieses Metall in an sich bekannter Weise nach der Zerkleinerung der Klinker durch Scheidung entfernt werden kann. Das reduzierte und vom Eisen befreite Rohgut wird schließlich erfindungsgemäß, gegebenenfalls unter Beifügung von Oxydationsmitteln, oxydiert.According to the invention, there is a reducing fire of cement raw materials for the production of white cement intentionally brought about in these fabrics to convert contained iron oxide into metallic iron, so that this metal in an is known to be removed by divorce after the crushing of the clinker can be. The reduced and iron-free raw material is finally according to the invention, if necessary with the addition of oxidizing agents, oxidized.

Das neue Verfahren läßt sich ohne weiteres auf alle Rohstoffe anwenden, deren Gehalt an Eisen groß oder klein ist.The new process can easily be applied to all raw materials whose iron content is large or small.

Beispielsweise werden die (blichen Zementrohstoffe im Gemisch mit 6 °l,) Koks im Drehofen gesintert oder geschmolzen. Bei Erreichung einer Temperatur von 700 bis 900° C werden die Eisenoxyde in der entstehenden Kohlenoxydatmosphäre zu Metall reduziert, das in Form feiner Flitter oder Kügelchen in dem enthaltenen Klinker verbleibt. Nach der Zerkleinerung. der Klinker werden die Me-'talheile mit Hilfe eines Magneten herausgelassen und dann die gepulverte Klinkermasse etwa eine halbe Stunde auf etwa 5oo° C unter Luftzutritt erhitzt. Dabei verbrennt der etwa vorhandene überschüssige Koks, und das durch die Schwefelbeimengungen des Brennstoffes entstandene Schwefelcalcium wird in unschädlichen Gips übergeführt. Den Zementrohstoffen kann man natürlich auch noch Flußmittel zur Herabsetzung der Sintertemperatur hinzusetzen.For example, the (customary cement raw materials mixed with 6 ° l) coke are sintered or melted in a rotary kiln. When a temperature of 700 to 900 ° C is reached, the iron oxides are reduced to metal in the resulting carbon oxide atmosphere, which remains in the clinker in the form of fine flakes or globules. After crushing. the clinker, the metal parts are let out with the help of a magnet and then the powdered clinker mass is heated for about half an hour to about 500 ° C with the admission of air. Any excess coke that may be present is burned and the calcium sulfur 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.

Claims (1)

PATENTANSPRUCH: 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 dann das metallische Eisen durch Scheidung entfernt, dadurch gekennzeichnet, daß man das erhaltene; von Eisen befreite Rohgut, :gegebenenfalls unter Beifügung von Oxydationsmitteln, oxydierend erhitzt:PATENT CLAIM: Process for the production of white cement from colored, z. B. ferrous raw materials, after which the raw materials, optionally under Addition of coke or reducing agents, reducing burns, the resulting Crushed clinker and then removed the metallic iron by divorce, thereby characterized in that the obtained; Raw material freed from iron,: if applicable with the addition of oxidizing agents, oxidizing heated:
DEM112000D 1929-09-26 1929-09-26 Process for the production of white cement from colored, e.g. ferrous raw materials Expired DE531416C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM112000D DE531416C (en) 1929-09-26 1929-09-26 Process for the production of white cement from colored, e.g. ferrous raw materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM112000D DE531416C (en) 1929-09-26 1929-09-26 Process for the production of white cement from colored, e.g. ferrous raw materials

Publications (1)

Publication Number Publication Date
DE531416C true DE531416C (en) 1931-08-10

Family

ID=7327392

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM112000D Expired DE531416C (en) 1929-09-26 1929-09-26 Process for the production of white cement from colored, e.g. ferrous raw materials

Country Status (1)

Country Link
DE (1) DE531416C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748873C (en) * 1940-05-21 1944-11-18 Process for extracting or refining metal in a rotary kiln with the simultaneous production of cement or hydraulic lime
DE1036745B (en) * 1955-09-23 1958-08-14 Dyckerhoff Portland Zementwerk Process for the production of white cement
DE1226124B (en) * 1959-08-20 1966-10-06 Beteiligungs & Patentverw Gmbh Process for the reduction of fine-grained oxidic iron carriers in a rotary kiln

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748873C (en) * 1940-05-21 1944-11-18 Process for extracting or refining metal in a rotary kiln with the simultaneous production of cement or hydraulic lime
DE1036745B (en) * 1955-09-23 1958-08-14 Dyckerhoff Portland Zementwerk Process for the production of white cement
DE1226124B (en) * 1959-08-20 1966-10-06 Beteiligungs & Patentverw Gmbh Process for the reduction of fine-grained oxidic iron carriers in a rotary kiln

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