マグネタイトと無煙炭からなる混合ペレットの還元に関する研究

概要

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A study was made of the influence of firing atmosphere (CO_2-N_2, N_2, and CO-N_2) on the reduction of magnetite pellets containing anthracite. Phase change during the firing was investigated by X-ray diffraction method and microscopic observations. The results are as follows. 1) The finer the particles of ore and anthracite were, and the more content of anthracite in initial pellet was, the faster the reduction proceeded. 2) Fayalite was found in the outside layer of magnetite pellets which were fired in CO_2-N_2 atmosphere. 3) The amount of residual carbon in pellets decreased rapidly during the first 30 min of firing in every atmosphere, but the decrease was most rapid in CO_2-N_2 atmosphere. 4) It was found in microscopic observations that reduction of ore particles in pellets proceeded topochemically. 5) Decrepitation and lamellar structure of metallic iron were found in some of ore particles in pellets fired. 6) Cementation of metallic iron was observed in pellets fired in N_2 and CO-N_2 atmosphere.
1971-03-01