Iron Removal from Phosphoric Acid by Paramagnetism

Overview on the removal of iron from phosphoric acid: A Comparative study

“…The concentration of iron should be <1.5% Fe 2 O 3 as standard for fertilizer grade phosphoric acid of 50% P 2 O 5 [16][17][18][19]. Many trials were performed by various techniques in order to purify the WPA via precipitation [4], adsorption, , ion exchange [20][21][22], reverse osmosis, ultrafiltration [23][24][25][26][27][28], electrodeposition [29], solvent extraction [30][31][32] and magnetic separation [33] The concentration of iron in phosphate rocks varies from 0.1% -4.0 % as Fe 2 O 3 depend on their origin [34,35].The present overview discusses some of the techniques used for iron removal from WPA mainly, precipitation, adsorption and solvent extraction, magnetic separation, crystallization, reverse osmosis, nanofilteration as well as electrodialysis.…”