Effect of Particle Size of MgO on the Sinter Strength before and after Reduction and Its Mechanism Analysis

It is a popular countermeasure to add MgO into sinter cope with the use of high-Al2O3 iron ore. The effects particle size MgO-bearing flux on strength sintered sample (Fe2O3-MgO and Fe2O3-MgO-CaO series) are discussed in present work for purpose improving before after reduction. experimental results show that (1) increase fine light calcined magnesite (LCM) from 0 100%, compressive Fe2O3-MgO series increased 5.66 7.42 MPa reduction 2.49 6.03 reduction, 4.62 7.01 4.00 6.23 result sintering pot experiment conformed laboratory result. In actual production, LCM 50% grind should be added based economic concerns environmental protection. (2) ball-to-ball model was introduced explain reason addition (3) To quantitatively analyze relationship mineralization rate flux, reaction carried out study as follows: diffusion layer thickness rates coarse were 250.8 μm 12.54 μm·min−1, respectively, those 397.1 19.86 respectively. also explained more (4) compact uniform microstructures less transformation Fe2O3 Fe3O4 resulted finer Based above results, adding effective enhancing quality.