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Pachuca tank

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Pachuca tank \Pa*chu"ca tank\ (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.
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