OUESTION $2$

A hydrocyclone operating in closed circuit with a SAG mill is fed at the rate of $30\frac{t}{h}($dry

basis$)$ of a slurry containing $30\%$ of solids by mass. Using the solids percentage split to the

underflow of $68\mathrm{.}56\%$ and the following overflow and underflow size distributions shown in

Table $1,$ determine the following:

NOTE: A graph paper is provided on page $6.$ Please submit it together with your answer book

Table $2\mathrm{.}1$ Size distribution of Underflow and Overflow streams of a hydrocyclone

$I=\frac{d_{75}-d_{25}}{2d_{50}}$

$2\mathrm{.}1$ Draw a flowsheet representing the circuit and name all streams.

$2\mathrm{.}2$ Estimate the flowrate of the underflow and overflow $($on dry basis$)$ of the hydrocyclone,

in $\frac{t}{h}?$

$2\mathrm{.}3$ Reconstitute the feed size distribution.

$2\mathrm{.}4$ Draw a partition curve and hence determine the cut point $d_{50}.$

$2\mathrm{.}5$ Determine the imperfection of separation $($I$).$