Back to results
US 4,230,594 AGranted
Method of treating spent reducing gas
AssigneeFirma Carl Still GmbH & Co. KG
InventorsHeinrich Weber, Kurt Tippmer
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeFirma Carl Still GmbH & Co. KG
InventorsHeinrich Weber, Kurt Tippmer
Estimating the term…
A method of producing reducing gases from oxide ores, particularly iron ores, which contain mainly carbon monoxide and hydrogen and which are employed in the reduction process with a two to three fold excess with regard to the stoichiometric requirement of the ore to be reduced, comprising, mixing a hot moist fresh reducing gas and a preheated recycled gas, both of which are used in reducing iron ores and mainly contain carbon monoxide and hydrogen, directing the mixed gases in counterflow heat exchange with iron sponge in a desulfurizer to treat the sponge, thereafter, directing the treated sponge into an oxidizer and circulating preheated air thereover to lightly oxidize the iron sponge, and subsequently, directing the lightly oxidized iron sponge into a reducing shaft along with the mixed gases which are taken out of the desulfurizer.
A method of treating spent reducing gas which was spent in reducing iron ore comprising the steps of mixing the spent reducing gas with a fresh gas to replenish carbon monoxide and hydrogen and form a mixed gas of the type having substantially carbon monoxide, hydrogen sulfide and carbonyl sulfide, and directing an iron sponge in a counterflow heat transfer contact with said mixed gas at temperatures ranging from 700.degree. C. to 1200.degree. C. to partly desulfurize said mixed gas and to remove unreacted carbon from said mixed gas.
A method of treating spent reducing gas which was spent in reducing iron ore comprising the steps of first treating the spent reducing gas by cooling the gas to a temperature range of 70.degree. C. to 40.degree. C., dedusting the gas, compressing the gas to a pressure to 6 to 12 bar, and washing carbon monoxide out of the gas to an amount of 2 to 10 percent by volume;
Dependencies are inferred from the claim text.