| http://www.w3.org/ns/prov#value | - Periodic manual removal of silica, carbon and other solids that accumulate in the pickling tanks is preferable, but continuous removal can be achieved by installation of a centrifuge or hydrocone (not shown) but so arranged that a portion of the recirculation solution containing solids in suspension from the tank S can be by-passed at high velocity by pump 1 for centrifugal removed of the solids a
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