PRODUCTION OF HIGH QUALITY REDUCED IRON FROM IRONMAKING DUST

• Main Authors: JITOU NORIAKI, IKEDA TSUNEO, MAJIMA SHUJI, TAKASHIMA TOSHIHARU
• Format: Patent
• Language: English
• Published: 02.06.1998
• Edition: 6
• Subjects: CHEMISTRY; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON

PROBLEM TO BE SOLVED: To obtain high quality powdery reduced iron from ironmaking dust by executing the reduction treatment to green pellet produced from the dust adjusting the basicity of gangue component and carbonaceous material in a specific condition and separating the agglomerated metallic iron grains from the low m.p. slag. SOLUTION: The basicity CaO/SiO2 of the gangue component in the ironmaking dust is adjusted to 1.4-1.6. Further, the carbonaceous material of fine powdery coke, anthracite, etc., is charged in a furnace so as to become 10-20% in the conversion into the carbon. These raw materials are mixed and binder is mixed to produce the green pellet of about 10mm average grain diameter. The pellet is dried and charged into a rotating furnace hearty type sintering furnace as the thin layer and sintered at 1250-1350 deg.C. In this process, the iron oxide in the dust is reduced with the carbonaceous material and made to the metallic iron and aggregated by lowering the m.p. according to the carburization with the carbonaceous material. The part containing the gangue component is produced to the low m.p. slag. In this result, mutual shifting of the materials in the pellet is developed and the metallic irons are aggregated with surface tension.