鉄-酸化鉄含有スラグー炭素混合粉成型体の急速加熱により得られる粒鉄の浸炭

摘要

新鉄源製造技術の一つとして，粉鉱石-微粉炭混合粉の急速加熱による粒鉄製造プロセスが多くの注目を集めている。このプロセスでは約15分という短時間で，鉱石の還元，溶融還元，還元鉄の浸炭，スラグーメタル分離が終了する。%Iron nugget making process by rapid heating reduction of powdery iron ore and pulverized coal mixture is regarded as one of the novel iron-making processes. Iron carburization during smelting reduction is especially important reaction step from the viewpoint of saving energy in this process. If the rate and efficiency of carburization reaction are increased, energy consumption of the process will be reduced to large extent. The purpose of this study is to clarify the carburization degree of iron nugget during smelting reduction of the mixture.rnThe sample was prepared from graphite, electrolytic iron powder and synthetic slag containing iron oxide to simulate iron carburization phenomena during smelting reduction of the mixture in the present work. The sample was quenched immediately after the mixture changed into nugget shape in a rapid heating process. Laser microscope combined with infrared image furnace was used for sample heating and observation of carburization phenomena, and carbon content in the nugget was chemically analyzed after quenching.rnFrom above-mentioned investigations, it was revealed that the occurrence of carburization during smelting reduction in the sample mixture is advantageous to obtain higher carbon contain iron nugget.