Our EXAMPLE Grinding and Classification Circuit is designed to grind 500 tonnes of ore per day, operating 24 hours per day, with an availability of 95%. This circuit will grind -5/8″ material from the Crushing Plant, classify the slurry in one of two cyclones, and pass 70% of the minus 200 mesh material to the mill feed Thickener Circuit at a rate of 22 mtph.
This section is intended to be read in conjunction with the Flowsheet and Piping and Instrument Diagrams.
The Grinding and Classification Circuit is designed to the following criteria:
F80 Feed Size 80% minus 7/16″ (11,000 microns)
P80 Product Size 70% minus 200 mesh (75 microns)
Ore’s Bond Work Index 17.7
Circulating Load 400%
Ball Mill Power 800 HP
Detailed Process Description and Control: Crushed ore in the fine ore bin flows through a slot feeder onto a 30″ variable speed belt feeder. The
bin low level alarm on the mill control panel annunciator will inform the mill that there is a shortage of feed material. The belt feeder has level and
pullcord switches identical to the other three conveyors. In addition, the belt feeder is equipped with two speed switches; one at each pulley, in order to ….Read more