actor ▁are ▁co o led ▁to ▁ 7 0   ° C ▁and ▁le ached ▁with ▁ 3 0   ° C ▁water . ▁A ▁ratio ▁of ▁ 1 0 ▁parts ▁water ▁to ▁mass ▁of ▁ore ▁originally ▁added ▁is ▁used . ▁ ▁This ▁le aching ▁process ▁continues ▁for ▁ 1 2 ▁to ▁ 1 5 ▁hours . ▁ ▁Fil tr ation : ▁All ▁sol ids ▁from ▁step ▁three ▁are ▁filtered ▁off . ▁ ▁Such ▁sol ids ▁include : ▁sil ica , ▁r ut ile , ▁z ir con , ▁il men ite , ▁and ▁und ig ested ▁mon az ite ▁resid ues . ▁ ▁The ▁resulting ▁solution ▁is ▁called ▁mon az ite ▁sul f ate . ▁ ▁D il ution : ▁D il uted ▁the ▁mon az ite ▁sul f ate ▁with ▁ 6 – 7 ▁parts ▁water ▁at ▁ 3 0   ° C . ▁ ▁Ne ut ral ization : ▁Add ▁N H 3 ( a q ) ▁to ▁neutral ize ▁to ▁a ▁p H ▁of ▁ 1 . 1 ▁to ▁form ▁a ▁select ive ▁precip itate ▁of ▁thor ium - ph osph ate ▁c ake . ▁ ▁Fil tr ation : ▁Collect ▁thor ium ▁ph osph ate ▁precip itate ▁during ▁fil tr ation ▁of ▁neutral ized ▁mon az ite ▁solution . ▁ ▁D ry er : ▁Fe ed ▁thor ium - ph osph ate ▁c ake ▁through ▁a ▁dry er ▁at ▁~ 1 2 0   ° C ▁to ▁create ▁concentr ated ▁thor ium ▁ph osph ate . ▁ ▁Ne