Method of producing pig iron, alloys of ferrous metal and/or...

C - Chemistry – Metallurgy – 22 – B

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C22B 7/04 (2006.01) C04B 5/00 (2006.01) C04B 7/153 (2006.01) C04B 7/28 (2006.01) C21B 3/04 (2006.01) C21B 3/06 (2006.01) C21B 11/00 (2006.01)

Patent

CA 2214079

The invention concerns a method of producing pig iron, non-ferrous metal alloys, ferrochromium carbides or carbon-free ferrochromium and synthetic blast furnace slag using residues of incinerated waste or slag containing metal oxides. According to the invention the materials used in waste- incineration, such as for example light fractions obtained from vehicle shredders and blast furnace dusts, are (1) oxidized at least partially and then reduced, with the deposition of nonferrous metals or alloys. The oxidic slag phase, depleted of metals or alloys, is then (3) mixed with liquid steelworks slag, optionally with the further addition of blast furnace dusts, whereupon, as the viscosity of the steelworks slag is reduced, raw steel is extracted, and (4) the remaining slag portion is subjected to further reduction, producing pig iron and possibly ferrochromium alloys. The resultant synthetic blast furnace slag is then discharged.

L'invention concerne un procédé de production de fonte brute, d'alliages de métaux lourds non ferreux, de carbures de ferrochrome ou du ferrochrome exempt de carbone et de scories synthétiques de haut fourneau, à l'aide de résidus d'incinération d'ordures ou de scories contenant des oxydes métalliques. Selon l'invention, les matériaux utilisés dans le cadre de l'incinération d'ordures, tels que des fractions légères provenant de shredders d'automobiles et de poussières d'usines métallurgiques sont (1) au moins partiellement oxydés, puis réduits par séparation des métaux non ferreux ou des alliages. La phase de scories oxydée, appauvrie en métaux ou en alliages, est ensuite (3) mélangée avec des scories liquides d'aciérie, éventuellement par adjonction de poussières d'usines métallurgiques. Après abaissement du degré de viscosité des scories d'aciérie, de l'acier brut est extrait et (4) la partie de scories restante est soumise à une autre réduction, ce qui permet d'obtenir de la fonte brute et éventuellement des alliages fer-chrome. Les scories synthétiques de haut fourneau sont ensuite enlevées.

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