The ore ball mill bond work index ranges from 8.5 to 12.5 kW hr/tonne. Stockpiled, crushed ore is fed to a 32 x 15 SAG mill at a rate of about 44,000 metric tons per day. The SAG mill discharge is further ground with two 20 x 31 ball mills operated in closed circuit producing flotation feeds with a 106
The Ball Mill 3 Expansion Project is designed to increase mill throughput to 45,000 tonnes per day from 40,000 tonnes per day and improve copper recovery as a result of achieving a finer grind of ore.
The ore from the mine contains about 2% copper. To get at the copper the first stage is crushing in huge cylindrical ball mills. Ball mills crush the ore into a fine powder. Stage 2: Froth flotation The powdered ore is mixed with a special paraffin oil which makes the copper mineral particles water repellent.
The rod mill and two ball mills are approximately the same size for simplified maintenance. Porphyry copper ores, usually medium to medium hard, require grinding to about 65 mesh to economically liberate the copper minerals from the gangue.
A 62.5 percent solids discharge from the rod mill is sized in a spiral classifier operating in closed circuit with a ball mill. The sands are reground in the ball mill, and the pulp containing 80 percent, minus 150 mesh is pumped to a conditioner where 0.2 pound of KAX and 0.36 pound of MIBC per ton of slag are added.
porphyry copper deposit, which is located in Kerman Province in the southeastern part of Iran. 2. Experimental section 2.1. Materials The obtained samples from the ball mills input of the Sarcheshmeh copper mine were crushed in a jaw crusher . The size fraction of 2000 +250 micrometers was collected for experiments. Samples was ...