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red mud

1. n. [Drilling Fluids]

A clay-based water mud that used tannates (from tannic acid) as clay deflocculant and mined lignite for fluid-loss control, usually with lime. The tannates were usually quebracho, which is red at high pH. Red muds were used extensively in the 1940s and 1950s.

Alternate Form: quebracho

See: deflocculantlime mudpHstarchtannin

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