Preparation of Lithium Iron Phosphate from High-Iron-Containing Desulphurization Slag

Abstract

Using high-iron-containing desulphurization slag as raw materials, ferrous sulfates with the high purity of 99.0%were prepared by microwave-assisted acid leaching. Ferrous oxalates were prepared from the ferrous sulfate. The effects of dose and reaction temperature were investigated to get ultra-fine ferrous oxalate. Lithium iron phosphates were then synthesized by using mechanical-chemical method with above lab-made ferrous oxalate. The experimental results showed that when the burning temperature of 700oC and reaction time of 4h were used, it was feasible to produce spherical lithium iron phosphate particles with high purity, good crystallinity and evenly distributed particle size (the average diameter of 9.407¦Ìm).