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US 6,676,747 B2Granted
Method for producing puzzolanic binders for the cement industry from steel slags using a reduction metal bath
AssigneeHolcim Ltd.
InventorAlfred Edlinger
Life of this patent
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Abstract
In a method for producing puzzolanic or hydraulic grinding additives for the cement industry from basic oxidic slags, in particular steel slags, using a metal bath for the reduction of metal oxides contained in the slags, the basicities of the liquid slags are adjusted to values lying 0.1 to 0.5 below the basicity value (CaO/SiO2) of the target slag prior to the reduction by adding acidic corrective substances such as, e.g., quartz sand and/or blast furnace slag and/or SiO2-containing corrective substances.
Claims20
A method for producing additives for the cement industry from basic oxidic slags, comprising the steps of
- charging liquid slags onto a metal bath;
- adding at least one acidic substance to said liquid slags to adjust the basicity of said liquid slags to a value 0.1 to 0.5 below a target basicity value (CaO/SiO2) selected for target slag;
- and
- reducing metal oxides in said liquid slags to produce the target slag.
1 more element
Dependencies are inferred from the claim text.