Estimate the energy requirement for circuit

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Reference no: EM133238391

Question: A milling circuit consists of a primary SAG (semi-autogenous grinding) mill that is in open circuit.The product from the SAG mill is fed to the ball mill, with the product from the ball mills beingclassified in cyclones. The underflow from the cyclones is recycled, with the overflow formingthe feed to the flotation circuit.The milling circuit has a feed rate of 1 500 t/hr. Consider two size classes, above and below 75microns. The feed has 25% passing 75 microns, and each of the mills breaks 50% of thematerial in the feed above 75 microns to below 75 microns. The partition number for the particlesabove 75 microns is 0.75, while that below 75 microns is 0.25.(a) Carry out a mass balance to calculate the mass rate of both size fraction in each stream.(b) What is the percentage passing 75 microns in the circuit product/flotation feed(b) If the Bond work index is 15 kWh/t, estimate the energy requirement for this circuit. Thismilling circuit's feed has 80% passing 1 cm, and the final feed to the flotation circuit has 80%passing 60 microns.

Reference no: EM133238391

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