Process for producing sulfate cement or sulfate cement aggregates
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United States of America Patent
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Oct 31, 2000
Grant Date -
N/A
app pub date -
Dec 8, 1998
filing date -
Apr 9, 1997
priority date (Note) -
Expired
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Abstract
Sulfate cement or sulfate cement aggregates are produced herein by a process in which hydraulically active synthetic slags having slag basicities CaO/SiO.sub.2 of between 1.35 and 1.6, Al.sub.2 O.sub.3 contents of 10% by weight to 20% by weight, and iron oxide contents of below 2.5% by weight are mixed with an earth alkali sulfate in an amount of 5% by weight to 20% by weight, based on the overall weight of the mixture. The hydraulically active synthetic slags can be made by mixing at least one member selected from the group consisting of waste incineration slags and blast furnace slags with steel slags to produce a melt and reducing metal oxides contained in the melt. The earth alkali sulfate is selected from the group consisting of crude gypsum, waste gas gypsum, smoke gas desulfurization plant gypsum, gypsum, or anhydrite in ground or comminuted form.
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