Methods for preheating metal-containing pellets
US12305926B2 · kind B2 · utility
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11References
6Claims
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Key dates
| Filing date | Aug 9, 2021 |
| Grant date | May 20, 2025 |
| Priority date | — |
| Expiry date | Mar 21, 2044 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27D3/0033
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for preheating metal pellets before charging into a melting furnace, wherein the pellets are transported by a conveyor belt to a chute and discharged from the chute into the melting furnace, the method including heating the pellets by direct flame impingement from two or more banks of burners, wherein the two or more banks of burners comprise an upstream bank of burners and a downstream bank of burners; and controlling the upstream bank of burners to operate oxygen-rich so as to create an oxidizing zone and the downstream bank of burners to operate fuel-rich so as to create a reducing zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.