pachuca tank

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pa`chu´ca tank

1.(Metallurgy) A high and narrow tank, with a central cylinder for the introduction of compressed air, used in the agitation and settling of pulp (pulverized ore and water) during treatment by the cyanide process; - so named because, though originally devised in New Zealand, it was first practically introduced in Pachuca, Mexico.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.