Mass balance in closed circuit grinding - Grinding & Classification Circuits - Metallurgist & Mineral Processing Engineer

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Mass balance in closed circuit grinding (4 replies and 2 comments)

8 years ago

jamesd 8 years ago

How to establish a mass balance and derive the circulation load of a closed circuit given the specific gravities of the mill discharge to classifier, underflow and overflow from the classifier?

An iron ore company milled ore at the rate of 150 t/h in a ball mill in closed circuit with a classifier. The underflow (course) stream was recirculated to the mill till a steady value was obtained in the cyclone overflow stream. The specific gravities of each stream were measured as:

a) Mill discharge stream to classifier = SG(md)

b) Product overflow from the classifier = SG (of)

c) Product underflow from the classifier = SG (uf)

Establish a mass balance and derive an expression for the circulating load. (in terms of densities or specific gravities of the streams)

p.s I've been solving this problem for like 8 hours and I'm not sure if Jones' assumption is valid.