# Grinding & Classification Circuits

Grinding & Classification Circuits 2017-04-04T06:57:16+00:00
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## Mass balance in closed circuit grinding (4 replies and 2 comments)

jamesd
11 months ago
jamesd 11 months 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.

Bill Fraser
11 months ago
Bill Fraser 11 months ago
jamesd
11 months ago

Hi! Is there a standard formula for the problem? Thanks 🙂

Bill Fraser
11 months ago
Bill Fraser 11 months ago

You want us to do your homework for you?

Page 227, Section 11.1 Ore-specific gravity and pulp density relations and Page 233, Section 11.3.1 Circulating load using pulp densities

jamesd
11 months ago

I would be happy sir hahaha I got stuck on this :/

9 months ago

Bill, I need advise on how to optimize comminution circuit for effective liberation of valuable mineral

Bill Fraser
9 months ago
Bill Fraser 9 months ago

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