Hydraulic Classifiers
Reciprocating Rake Classifiers. The Dorr Company is the principle advocate of this machine. Singlestage Type. The Dorr classifier (Figs. 19 and 20) consists of a rectangular, inclined settling box of wood, steel, or concrete, with the upper or discharge end open, in which are placed mechanically operated rakes or scrapers which carry the quicksettling, coarse particles to the point of ...