Study of thermal deformations in iron ore raw materials at high temperature roasting

The paper presents the results of experimental studies for thermal deformations in iron ore raw materials, which have a significant impact on chemical and metallurgical processes behavior of heat treatment in conveyor roasting and sintering machines. The influence of the chemical and mineralogical composition of iron ore raw materials supplied for processing on the thermal deformation value is revealed. Thermal deformations at high temperatures are established to contribute to the softening and melting of iron ore materials, contributing to negative gas dynamics processes in a dense layer of iron ore pellets on a roasting machine conveyor or in a sintered layer on a sintering machine belt. The temperature-concentration dependences for thermal deformations of solid iron ore materials with reacting components are revealed and described based on the data of chemical and mineralogical analyzes established on the experimental determination of the temperature dependences of an individual samples complex for various geological formations and generations. Based on the results of experimental studies, the main regularities for the thermal deformations formation and the most significant factors determining the behavior of iron ore raw materials in the process of thermal influence are determined in the temperature ranges of operating conveyor roasting and sintering machines.