Abstract
Currently, the Lisakovsk field is one of the raw material bases of ArcelorMittal Temirtau JSC. However, at present, their use in metallurgical production is limited due to the high content of phosphorus. It was found that phosphorus in lisakov concentrate is present in the form of various minerals (ooliths, vivianite, hydrogetite) and compounds (iron phosphates, hydrated phosphorus components). By reacting with the gaseous compounds of these different iron phosphates, conditions can be created to reduce excess phosphorus. This article discusses the thermodynamic interaction of iron phosphate with various gaseous components. The object of the study is the Lisakov gravitational-magnetic concentrate, which contains up to 0.7% phosphorus. Phosphorus in the composition of phosphorus gravitational-magnetic concentrate is added to the mineral vivianite, which represents the compound of hydrogetite with phosphorus pentaoxide. When oxidized to a temperature of 900-1000°C, iron phosphate breaks down into iron oxide and phosphorus pentaoxide. The released phosphorus pentaoxide is a chemically active and mobile substance. Thus, in the future, this phosphorus pentaoxide may undergo decomposition under certain conditions. Considering the insufficiently studied mechanism of annealing and leaching, as well as the shortcomings of the proposed technologies, initiative studies of pyrogydrometallurgical technology for removing phosphorus peroxide content in the Lisakovsk enrichment using annealing and leaching with sulfuric acid were carried out.