mineral processing technology and mineral processing equipment

In mineral processing plant , Two basic types of gravitational classifiers employed today are the spiral classifiers and the rake classifier. They both introduce the feed submerged into a pool area and subject the solids to an upflow current. The overflow is obtained from a peripheral weir that provides the vertical velocity. A solid whose terminal settling velocity is high enough will settle against this current and report to the base of the pool. At this point, a rake or screw conveys the solids out of the pool and up the beach to drain the “sands” product before discharging it over the end of the slope. Figure 1 is a schematic of a spiral classifier. The rake classifier has a series of rakes (actually blades) that operate in a reciprocating fashion to move the sands up the beach. A third type is termed a “hydroseparator.” The feed again enters submerged through a circular centralized feedwell, and the peripheral overflow weir causes an upward velocity. The underflow is raked ...