Slag discharging method in process of producing ultra-low phosphorus steel and method for producing ultra-low phosphorus steel
US11718885B2 · kind B2 · utility
Assignee
Inventors
- Shucheng Zhu
- Hu Zhao
- Shaopu Xu
- Zhongbo Li
- Hongyang Li
- Yang Yang
- Zhenglei Tang
- Tao Zhang
- Qingbo Liu
- Zhanjie Zhang
- Jiheng Yuan
- Sa Yu
- Wenju Kang
- Xi Chen
- Shuai Zhang
- Bo Li
- Zhiquan Du
- Di Zhao
- Liang Li
- Peng Hui Jiang
- Yansheng Xue
- Keyi Fu
- Yingjie Wang
- Yongqi Yuan
- Zhenzhen Dong
- Baiming Pang
- Haiming Zheng
- Liang Chen
- Weibo Quan
- Xianxing Zhu
Key dates
| Filing date | May 23, 2019 |
| Grant date | Aug 8, 2023 |
| Priority date | — |
| Expiry date | Sep 22, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21C7/0645
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed is a slag discharging method in a process of producing ultra-low phosphorus steel, which relates to the technical field of iron and steel smelting, and in which molten steel is mixed with lime first to produce basic slag; then converting is performed with oxygen to increase the oxidizability of the basic slag; and a carbon-containing reducing agent is finally added, so that in the process that the carbon is oxidized to release a large amount of carbon monoxide gas, phosphates are captured, and the basic slag is rapidly foamed and overflows from the opening of the steel ladle, so that conditions are no longer available for rephosphorization. Also disclosed is a method for producing ultra-low phosphorus steel, which includes the above-described slag discharging method in a process of producing ultra-low phosphorus steel, and refining and ingotting after slag discharge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.