Method for preliminary treatment of molten iron

• Main Authors: Suzuki Norihiko, Tanaka Kotaro, Sasaki Naotaka, Ikeno Shizuhiko, Fukushima Hironori, Nishikori Masanori, Kikuchi Naoki, Iwaki Yozo, Senoo Masaomi, Ejima Kochiro, Kawabata Ryo, Uchida Yuichi, Ishii Takeshi, Yamamoto Kazuhito, Tano Manabu, Ogasawara Futoshi, Ogasawara Yasushi
• Format: Patent
• Language: English
• Published: 20.03.2018
• Subjects: CHEMISTRY; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

There is proposed a method for preliminary treatment of molten iron wherein heat source for dissolving scrap is ensured sufficiently to improve iron yield while decreasing phosphorus concentration efficiently by suppressing the amount of flux solvent used in the process of desiliconization, dephosphorization and decarburization. In the method for preliminary treatment of molten iron by conducting desiliconization and dephosphorization of molten iron with a converter type container, molten iron is first charged into the converter type container to conduct desiliconization and then intermediate slag removal is conducted, and subsequently a lime-based flux solvent is added to the container while blowing oxygen to conduct dephosphorization of the molten iron, and thereafter newly untreated molten iron is charged into the container to conduct desiliconization, and subsequently the above treatments are repeatedly conducted with the same container.