Development of dephosphorization technology for iron ores with high phosphorus content

Abstract The main methods of removing phosphorus and sulfur from iron ores, as well as magnetite and hematite concentrates, were analyzed. For effective dephosphorization of hematite concentrates, it is necessary to use direct cationic flotation of apatite, with the help of which it is possible to remove more than 74% of phosphorus from the concentrate. As a result of the analysis of the conducted research and the synthesis of the obtained scientific results, a technology was developed for removing phosphorus from iron concentrates. This technology allows for the reduction of the phosphorus content from 0.14% to 0.04%. Chemical methods – alkaline or acid leaching with separation of the leached concentrate – are the most common ways to dephosphorylate metal-containing ores. Research on chemical methods of cleaning ores and iron ore concentrates is carried out in the following directions: leaching with alkali solutions; acid leaching at different temperatures; and leaching of impurities in autoclaves. The conditions of leaching of poor hydrogethite high-phosphorus concentrates at high and low temperatures were investigated. The proposed technology of leaching samples of poor hydrogethite high-phosphorus concentrates at high and low temperatures allows us to claim that the parameters of the firing process allow the recrystallization of iron and therefore contribute to the access of mineral acid to particles containing phosphorus.