anthracite duff

anthracite duff

[′an·thrə‚sīt ‚dəf]
(materials)
In Wales, fine anthracite screenings used in briquets or mixed with bituminous coal to fuel cement kilns on chain grate stokers.
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References in periodicals archive ?
A generator that was able to burn anthracite duff [that part of anthracite that does not meet the premium market specification] and generate electricity.