Study of high temperature and pressure pyrolysis of iron ore concentrate incorporated with biomass and its reduction behavior
Considering biomass as a reducing agent,the pyrolytic gasification of iron ore concentrate incorporated with biomass and its reduction behaviour at the temperature of 1 040℃and pressure of 30 kPa were studied.The results show that the liquid phase of phenols and other macromolecular hydrocarbons are generated at the initial stage of biomass pyrolysis and interacted with the iron ore concentrate to form tar inclusions,which significantly retardes the release of biomass volatile fraction.The synergetic effects of external water and lattice oxygen in the iron ore concentrate promote the gradual oxidation of macromolecular hydrocarbons to become ketones and acids and eventually transform to the reduction gases such as CO and H2.The reduction of iron concentrate simultaneously generates the iron whiskers and partially forms carbon-iron compounds,which realizes the efficient and rapid reduction of iron oxides,and the metallization rate reaches 96.72%in the furnace in 50 min.
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