High density magnesia clinker and process for its production
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United States of America Patent
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Apr 29, 1986
Grant Date -
N/A
app pub date -
Apr 10, 1984
filing date -
Apr 12, 1983
priority date (Note) -
Expired
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Abstract
High density magnesia clinker characterized by having a chemical composition, as oxides in weight %, of MgO: 97.5% or more CaO: 0.8-2.0% SiO.sub.2 : 0.12-1.0% Fe.sub.2 O.sub.3 : 0.3% or less Al.sub.2 O.sub.3 : 0.15% or less B.sub.2 O.sub.3 : 0.03% or less with a bulk density of at least 3.48 g/cm.sup.3. The said high density magnesia clinker can be produced by forming magnesium oxide by calcination of naturally occurring magnesite having a composition, based on ignition in weight %, MgO: 97.5% or more CaO: 0.8-2.0% SiO.sub.2 : traces to 0.15% Fe.sub.2 O.sub.3 : 0.3% or less Al.sub.2 O.sub.3 : 0.15% or less B.sub.2 O.sub.3 : 0.1% or less, grinding the same after, or with, addition of amorphous silica, silica gel or a silicon compound capable of forming SiO.sub.2 by dead-burning in such a manner as to have the SiO.sub.2 content of 0.12-1.0% after dead-burning and dead-burning.
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