Gypsum is an
ingredient in the manufacture of portland cement, added to
control the setting time of the concrete. Gypsum is added to the
cement
clinker from the kiln and the mixture is processed to a fine
powder. The typical
gypsum
content of portland cement ranges from 5 to 10%. Mined gypsum
rock
is often used by the cement kilns, and the different physical form
of
processed drywall may necessitate adjustment of the facility's
materials
handling
system. The purity of gypsum in
the
wallboard is a major concern. Paper should be removed, and care
should
be taken during the collection of the wallboard to minimize the amount
of
impurities such as soil that are introduced.
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Virgin
Gypsum Rock at a Cement Plant
Comparison
of Virgin Gypsum Rock and Gypsum from Recycled Drywall
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