Microstructure Variation of Pellets Containing Ferrous Dust during Carbonation Consolidation

摘要: The carbonation and microstructurc characteristics of pellets containing ferrous dusts were investigated during consolidation at different reaction temperatures CO2 partial pressures. results indicated that green had loose network supporting structure with initial strength, large cracks pores existed in the pellets. was controlled by interfacial chemical fast stage, which limited diffusion thus caused rate to decrease. With increasing temperature pressure, conversion rates CaO number microcrystalline CaCO3 particles increased, volume expansion led a decrease open porosity, average pore size specific surface area Micro-pores occluded, smaller (diameter less than 50 nm) thereby resulting more compact uniform carbonated Simultaneously, dense prevented into product layer, affecting increase rate.