Method for oxidizing treatment of steel plant slag to obtain...

Details Method for oxidizing treatment of steel plant slag to obtain... Method for oxidizing treatment of steel plant slag to obtain...

2005-09-20

2005-09-20

Andrews, Melvyn (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

C106S789000

Reexamination Certificate

active

06946014

ABSTRACT:
A method for treating a raw steel plant slag to transform it into a hydraulic binder at least equivalent to a Portland cement clinker, comprises the following steps: oxidizing treatment with input of oxygen, air or a mixture thereof at a pressure ranging between 1 to 15 bars, at a temperature ranging between 1650 and 1400° C., of raw steel slag containing, relative to the raw slag total weight, at least 45 wt. % of CaO and less than 30 wt. % of Fe2O3; and adding to the slag a lime source optionally with silica and/or alumina, so that the slag, after tranformation and at room temperature, has a propotion of Fe2O3of less than 13 wt. % and a mineralogical composition comprising at least 40 wt. % in C3S mineralogical phase and more than 10 wt. %, of calcium ferrite, relative to the final slag total weight.

REFERENCES:
patent: 5395443 (1995-03-01), Hooykaas
patent: 2004/0020411 (2004-02-01), Sorrentino et al.

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