Blast furnace operation method
US11041220B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2017 |
| Grant date | Jun 22, 2021 |
| Priority date | — |
| Expiry date | Apr 7, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21B5/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided is a blast furnace operation method that enables lowering of the reducing agent ratio of a blast furnace. The blast furnace operation method includes injecting pulverized coal through tuyeres of a blast furnace. The method includes adjusting coal containing moisture and volatile matter to form adjusted pulverized coal having a specific surface area within a range of 2 m2/g or more and 1000 m2/g or less, a lower heating value of 27170 kJ/kg or more, and a volatile matter content within a range of 3 mass % or more and 25 mass % or less. The method further includes injecting, through the tuyeres of the blast furnace, pulverized coal in which the adjusted pulverized coal, in a mixing ratio of 10 mass % or more, is mixed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.