Direct smelting process
AssigneeTata Steel Limited
InventorsRodney James Dry, Jacques Pilote
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Abstract
A molten bath-based direct smelting process comprises controlling the process conditions in a direct smelting vessel so that molten slag in a molten bath of metal and slag in the vessel has a viscosity in a range of 0.5-5 poise when the slag temperature is in the range of 1400-1550° C. in the molten bath in the vessel.
Claims12
A slag product of a direct smelting process, the slag product comprising molten slag that includes:
- TiO2:
- at least 15 wt. %,
- SiO2:
- at least 15 to 20 wt. %,
- CaO:
- at least 15 to 30 wt. %,
- Al2O3:
- at least 10 to 20 wt. %,
- FeO:
- at least 3 to 10 wt. %,
- carbon content:
- 3-5 wt. %, and
- vanadium oxide comprising more than 50% of a total vanadium output from the direct smelting process.
A feed material for a sulphate process for producing pigment-grade titania, the feed material being a product of a directing smelting process and having a microstructure that is amenable to processing in the sulphate process and wherein the feed material comprises:
- TiO2:
- at least 15 wt. %,
- SiO2:
- at least 15 to 20 wt. %,
- CaO:
- at least 15 to 30 wt. %,
- Al2O3:
- at least 10 to 20 wt. %,
- FeO:
- at least 3 to 10 wt. %,
- carbon content:
- 3-5 wt %, and
- vanadium oxide comprising more than 50% of a total vanadium output from the direct smelting process.
Dependencies are inferred from the claim text.