METHOD FOR THE PRODUCTION OF PORTLAND SLAG CEMENT AND BLAST FURNACE CEMENT
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United States of America Patent
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Issued Date -
Sep 30, 2010
app pub date -
Sep 24, 2008
filing date -
Sep 29, 2007
priority date (Note) -
Abandoned
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Abstract
A method for the production of Portland slag cement and blast furnace cement by two-step grinding, comprising the following steps: a) Portland cement clinker is charged into a first mill for preliminary grinding, the cement mill (24), b) the delivery material of the cement mill is supplied directly and/or via an intermediate reservoir into the inlet of a dynamic classifier, c) slag meal or slag grit is additionally supplied into the inlet of the dynamic classifier, d) oversized material discharged from the dynamic classifier is supplied for pulverising into the inlet of a second mill, e) the delivery material of the second mill is fed into the inlet of the dynamic classifier, and f) sulphate carrier is supplied either to the first mill, to the inlet of the dynamic classifier or to the inlet of the second mill, and g) the fine material of the dynamic classifier is supplied to a reservoir.
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