MINERAL PHASES OF THE THERMAL TRANSFORMATION OF A MIXTURE OF SIDERITE AND MARTITE ORE ACCORDING TO STRUCTURAL AND MAGNETIC METHODS

The conducted study of thermal transformations of a mixture of siderite and martite ore in different environments showed the possibility of obtaining less altered magnetite Mag1 with a Curie point of 553 and Mag2 with TC=400 ^oC close to magnesia magnetite. In addition, during such transformations, impurity ferromagnetic phases close to natural maghemite (T_С ~ 600 ^oC) and lougufengite (T_С ~ 200 ^оС) appear. It was established that such phases are formed by simple mixing, dry and wet grinding, but as a result of thermal transformation, Mag1 and Mag2 are always formed with an approximate phase ratio of 3 to 1.