Continuous vacuum crystallization.

A concentrate from an evaporation system is $5,870$ lb$/$h of $35$ wt$\%$

MgSO$4$ at $180$F and $25$ psia. It is mixed with $10,500$ lb$/$h of saturated aqueous recycle filtrate of MgSO$4$ at $80$F and $25$ psia. The

mixture is sent to a vacuum crystallizer, operating at $85$ F and $0\mathrm{.}58$

psia, to produce steam and a magma of $25$ wt$\%$ crystals and $75$ wt$\%$

saturated solution. Determine the lb$/$h of water evaporated and the

maximum production of crystals in tons$/$day $($dry basis$)$