低還元率還元鉄ペレットの溶鉄中への溶解速度

概要

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Rate of melting of partly reduced iron pellets into iron melt was obtained by measuring CO gas evolved. The effects of composition of pellets as well as temperature and carbon content of iron melt on their melting rate into the melt have been investigated. The following results are obtained : (1) Apparent activation energy of melting of reduced iron pellets containing 0, 10, 20 and 40% Fe_2O_3 was 33kcal/mol. (2) Without slag melt on the iron melt, the maximum melting rate of pellets containing 10, 20 and 40% Fe_2O_3 was obtained at about 3.3, 3.0 and 2.5% carbon contents respectively. (3) Melting rate was proportional to -0.5 power of Fe_2O_3 content at the range of 15-60% Fe_2O_3, increased at 2-10% Fe_2O_3 and decreased above 70% Fe_2O_3. (4) CaO, CaCO_3 or C of 2-5% as addititive increased the melting rate of pellets, but addition of Al_2O_3 or SiO_2 decreased it extremely. Simultaneous addition of CaO and SiO_2 (CaO/SiO_2=1) and addition of pre-fused slag whose melting point was low decreased the melting rate slightly up to 5%, and their content in pellets should be limited within 15%.
社団法人日本鉄鋼協会の論文
1979-02-01