Study on Promoting Low-temperature Fast Reaction by Mechanical Force

Physical and chemical properties of iron ore powder and carbon powder with mechanical impact are studied.During milling,the particle and grain sizes of iron ore and carbon are gradually refined,and the specific surface area is continuously increased.Amorphism,or phase change can occur when iron ore powder and carbon powder are refined further.Distortion and dislocation occur during grain refining process,which form a lot of activation center with decrease of activation energy of reactions.Gradual increase of specific surface area also improves reactivity of powder,and promotes gas-solid reaction and solid-solid reaction.Reduction temperature of refined iron ore powder is about 300℃ less than that of coarse powder,and will be reduced further with addition of catalyst.