Re: (erielack) Coal trains to Portland cement

["Gary R. Kazin" <gkazin_@_yahoo.com>]

One ingredient of cement is lime.  Limestone is mined from the earth; it
takes a lot of energy to convert it to lime.  The coal is used to provide
that energy.

- --- "David J. Monte Verde" <dmvgvt_@_earthlink.net> wrote:
> Why does the process of making cement use coal? To dry out the cement
> once it is mined?

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Gary R. Kazin
DL&W Milepost R35.7
Rockaway, New Jersey

http://www.geocities.com/gkazin/index.html

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