<Li> Neutralization: Add NH (aq) to neutralize to a pH of 1.1 to form a selective precipitate of thorium - phosphate cake . </Li> <Li> Filtration: Collect thorium phosphate precipitate during filtration of neutralized monazite solution . </Li> <Li> Dryer: Feed thorium - phosphate cake through a dryer at ~ 120 ° C to create concentrated thorium phosphate . </Li> <Li> Neutralization: Add NH (aq) to remaining monazite solution to create rare - earth - metal precipitate at a pH of 2.3 . </Li>

Monazite sand found in which state of india