Process for producing cement with reduced chromium content

Present invention relates to the method of producing a cement with reduced content of chromium, where 0.01 to 10% by weight of mechanically and/or thermally treated iron carbonates are used as iron correction component for the raw meal, with its subsequent burning at the temperature from 1400 DEG C...

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Bibliographische Detailangaben
Hauptverfasser: ORSAG ZDENO, MARTAUZ PAVEL, STRIGAC JULIUS PHD
Format: Patent
Sprache:cze ; eng
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Beschreibung
Zusammenfassung:Present invention relates to the method of producing a cement with reduced content of chromium, where 0.01 to 10% by weight of mechanically and/or thermally treated iron carbonates are used as iron correction component for the raw meal, with its subsequent burning at the temperature from 1400 DEG C to 1500 DEG C, thus achieving primary reduction of Cr in cement between 0.5 and 20 ppm of Cr. Such prepared cement receives during and/or after grinding chemically treated - activated iron carbonates in amount of 0.01 to 1% by weight, thus achieving final reduction of Cr in cement less than 0,5 ppm.