Upgrading iron and removing phosphorus from high-phosphorus iron ore

The reduction roasting-magnetic separation-sulfuric acid leaching of high-phosphorus iron ores was studied. The process parameters of acid leaching were optimized with rougher iron ore concentrate obtained by reduction roasting-magnetic separation of ROM (run of mine) ores. The effects of various factors on upgrading iron and dephosphorization were discussed in acid leaching. The result shows that the iron ore concentrate, assaying 62.35% iron and 0.20% phosphorus content are achieved at the overall iron recovery of 90.54% and dephosphorization of 87.42% under the conditions of leaching for 2 h, at 2.5 liquid-to-solid mass ratio, 50 kg/t sulfuric acid and 500 r/min agitating speed after the ROM ore with 47.28% iron and 1.59% phosphorus content is pretreated by reduction roasting-magnetic separation.