Simulation of Thermal Decomposition of Partially Calcined Spherical Limestone Injected into a Molten Iron Bath

摘要

To reduce the consumption of energy and materials, it is necessary to develop a more efficient method for refining iron. The use of partially calcined limestone as a refining flux is expected to increase the mass transfer and reaction area via thermal decomposition of CaCO3 and violent CO2 generation. A model was developed to simulate the decomposition of the limestone particles in molten iron using multiphysics analysis, in which the equations for multiphase flow, heat transfer, and chemical reactions were solved simultaneously. The particle penetration behavior and the temperature and mass distributions of CaCO3 were calculated as a function of time. A large amount of CO2 is generated in a short period, which is expected to generate a strong stirring effect and destroy the flux particles.