método de produção de ferro reduzido

• Main Authors: Takanori Satoh, Wataru Nagai, Takashi Sawai, Yuki Kuwauchi, Kazuo Oonuki, Kazuhisa Fukuda
• Format: Patent
• Language: Portuguese
• Published: 10.10.2017
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

A process for the production of reduced iron by drying compacts, which are obtained by compacting an iron oxide-based raw material containing a carbonaceous reducing material requisite to the reduction, and then charging the dried compacts into a reducing furnace to conduct reduction and thus obtain a reduced iron comprising both metallic iron and a mixture of slag components. In compacting the raw material, at least either of a CaO-base oxide-type modifier and an MgO-base oxide-type modifier is added to the raw material. Further, the total content of CaO, SiO2, MgO and Al2O3 in the compacts is adjusted to 8 to 20mass% of the total mass of the compacts exclusive of the carbonaceous reducing material, while the slag basicity, (CaO% + MgO%)/SiO2%, which is calculated by using the contents (mass%) of the slag components in the compacts, is adjusted to 0.9 to 3.0