公开(公告)号：US20230121123A1

公开(公告)日：2023-04-20

申请号：US17953832

申请日：2022-09-27

Applicant: University of Science and Technology Beijing

Inventor： Yanling ZHANG ,  Zheng ZHAO ,  Weifeng ZHANG ,  Zhonghua ZHAN

IPC: C21C7/064 ,  C21C1/02 ,  C21C7/068

Abstract: A method of making steel by deeply dephosphorization in a hot metal tank and decarburization using semi-steel with nearly zero phosphorus load in a converter includes the following steps: putting an efficient dephosphorization agent into the hot metal tank in advance, and conducting dephosphorization during blast furnace tapping and transportation of blast furnace hot metal by the hot metal tank to obtain semi-steel with [P] less than 0.04 wt. % and [C] greater than or equal to 3.5 wt. %; and removing dephosphorization slag, and pouring the semi-steel into the converter for decarburization to obtain molten steel. The efficient dephosphorization agent includes iron oxide scale, lime, and composite calcium ferrite. According to the method, a phosphorus content of the blast furnace hot metal is reduced to be less than or equal to 0.04 wt. % through the efficient dephosphorization agent.

公开(公告)号：US20230117352A1

公开(公告)日：2023-04-20

申请号：US17964973

申请日：2022-10-13

Applicant: University of Science and Technology Beijing

Inventor： Yanling ZHANG ,  Zheng ZHAO ,  Weifeng ZHANG ,  Kan YU ,  Yao ZHANG

IPC: C04B35/26

Abstract: Provided is a red mud-based composite calcium ferrite and a preparation method and use thereof. The preparation method of the red mud-based composite calcium ferrite includes the following steps: mixing red mud and a calcium source, and roasting an obtained mixture in an oxygen-containing atmosphere to obtain the red mud-based composite calcium ferrite; where the calcium source is selected from the group consisting of lime and calcium carbonate. In the present disclosure, the composite calcium ferrite is prepared using a solid waste red mud, with a greatly reduced cost of raw materials; on the other hand, compared with traditional calcium ferrite, the composite calcium ferrite mainly has phase structures of CaFe2O4, Ca2FeAlO5, and Ca2Fe2O5. Therefore, the composite calcium ferrite has a lower melting point, a higher lime dissolution efficiency, and better fluxing and dephosphorization effects during primary smelting and refining of molten steel, and has broad prospects for use in industry.