Screens gyratory screen separators

Gyratory screen separators, which impart a basically circular motion to the particles on the screen, are used for high capacity separation by size of dry materials, and for wet separations when oversize material constitutes a laige percentage of the feed (a typical example is shown in Figure 3.13). Common practice with gyratory screens has been to adapt the motion of one type of machine to perform either wet or dry separations, since two distinctly different types of motion are required for the best efficiency. 

The gyratory screen has become a remarkably useful processing tool, able to separate several solid fractions by the expedient of mounting a series of decks, one above the other on the one vibrating frame. 

Gyratory in plane of the screen (500 to 600 rpm 5° mdmation) fine separations particle diameter 50 to 4000 pm. 

In 1960 the maximum haul for the ore to the plant was 800 m, and 670 m for the overburden to the tailings pile. Primary gyratory cmshers first reduced the ore to a —15 cm (—6 in.) size, and then it proceeded to a series of size reduction and screening steps until its liberation size had been reached for a flotation separation (in 1960 there was also heavy media separation). Prior to flotation the ore was acid washed and then given an abrasive scmbbing to remove stains on the crystal surfaces... 

---