Question $3[30]$

Hydrocyclones are required for a desliming operation to remove overflow with $80\%$

passing $75m.$ Solids $(SG=3\mathrm{.}65\frac{g}{c}{m}^3)$ flowrate of $365tph$ is fed at $80$kPa to give

overflow solids at $36\mathrm{.}5tph.$ The relative density of the feed slurry is $1\mathrm{.}45.$ Perform a mass

balance on the cyclone streams and estimate the number of cyclones required for this

operation.