A method of introducing carbon to an Electric Arc Furnace (EAF) used for melting steel, and a composition of matter including carbon, and made in a briquette form. The composition comprises between 45 and 96 weight percent of a carbon-containing material, between 2 and 30 weight percent of a basic oxide, and between 2 and 25 weight percent of a binder material. The method comprises mixing between 45 and 96 weight percent of a carbon-containing material, between 2 and 30 weight percent of a basic oxide, and between 2 and 25 weight percent of a binder material to form a solid material mixture; compressing individual portions of the solid material mixture into compressed briquettes; curing the compressed briquettes into solid briquettes; and adding the solid briquettes into the molten steel in the electric arc steelmaking furnace.

A method of introducing carbon to an Electric Arc Furnace (EAF) used for melting steel, and a composition of matter including carbon, and made in a briquette form. The composition comprises between 45 and 96 weight percent of a carbon-containing material, between 2 and 30 weight percent of a basic oxide, and between 2 and 25 weight percent of a binder material. The method comprises mixing between 45 and 96 weight percent of a carbon-containing material, between 2 and 30 weight percent of a basic oxide, and between 2 and 25 weight percent of a binder material to form a solid material mixture; compressing individual portions of the solid material mixture into compressed briquettes; curing the compressed briquettes into solid briquettes; and adding the solid briquettes into the molten steel in the electric arc steelmaking furnace.

The method and the device serve to treat the flue dust formed during the production of nonferrous metals. After the addition of sulfur and/or a sulfur compound, the flue dust is heated, and volatile compounds are separated in a downstream offgas treatment unit. The flue dust is heated in an inert atmosphere.

The method and the device serve to treat the flue dust formed during the production of nonferrous metals. After the addition of sulfur and/or a sulfur compound, the flue dust is heated, and volatile compounds are separated in a downstream offgas treatment unit. The flue dust is heated in an inert atmosphere.

A continuous process for converting metal compound particles into a mixture of elemental metals. Metal compound particles and a reductant are introduced into an ultra-high temperature reaction zone having a temperature greater than 2,700 C. and an oxygen content less than 3 vol. %. The metal compound particles have particle sizes of d90 500 m. The metal compound particles have a residence time less than 1 minute in the ultra-high temperature reaction zone sufficient to mix with and react with the reductant to reduce the metal compound particles to form a mixture of elemental metals. The mixture of elemental metals is removed from the ultra-high temperature reaction zone. One or more elemental metals are separated or concentrated from the mixture of elemental metals within one or more separation zones based on differential size and density of the one or more elemental metals and the remaining mixture of elemental metals.

A continuous process for converting metal compound particles into a mixture of elemental metals. Metal compound particles and a reductant are introduced into an ultra-high temperature reaction zone having a temperature greater than 2,700 C. and an oxygen content less than 3 vol. %. The metal compound particles have particle sizes of d90 500 m. The metal compound particles have a residence time less than 1 minute in the ultra-high temperature reaction zone sufficient to mix with and react with the reductant to reduce the metal compound particles to form a mixture of elemental metals. The mixture of elemental metals is removed from the ultra-high temperature reaction zone. One or more elemental metals are separated or concentrated from the mixture of elemental metals within one or more separation zones based on differential size and density of the one or more elemental metals and the remaining mixture of elemental metals.

The present invention relates to a process for recovering zinc and iron products from zinc-containing waste materials obtained from the zinc or steel industry, or both, by first treating the waste material(s) with strong acid, to convert any zinc ferrites into leachable compounds, and then leaching the acid-treated material, neutralizing the acid of the leach solution, recovering zinc from the neutralized ferrous iron-containing solution, recovering iron from the thus obtained solution, and circulating at least a fraction of the raffinate solution obtained from the iron recovery back to the leaching step.

The present invention relates to a process for recovering zinc and iron products from zinc-containing waste materials obtained from the zinc or steel industry, or both, by first treating the waste material(s) with strong acid, to convert any zinc ferrites into leachable compounds, and then leaching the acid-treated material, neutralizing the acid of the leach solution, recovering zinc from the neutralized ferrous iron-containing solution, recovering iron from the thus obtained solution, and circulating at least a fraction of the raffinate solution obtained from the iron recovery back to the leaching step.

The present invention provides an extraction solvent for extracting metallic elements that is characterized in that: the total concentration of chlorine (Cl2) and hypochlorous acid (HOCl) is from 20 to 1000 ppm; chlorine (Cl2) and hypochlorous acid (HOCl) are included at a molar ratio of 1:1 to 1:11; the oxidation-reduction potential is from 1100 to 1400 mV; and the pH is from 1.7 to 3.7. The present invention also provides a method for producing said extraction solvent, and a method for recovering metallic elements by using said extraction solvent.

The present invention provides an extraction solvent for extracting metallic elements that is characterized in that: the total concentration of chlorine (Cl2) and hypochlorous acid (HOCl) is from 20 to 1000 ppm; chlorine (Cl2) and hypochlorous acid (HOCl) are included at a molar ratio of 1:1 to 1:11; the oxidation-reduction potential is from 1100 to 1400 mV; and the pH is from 1.7 to 3.7. The present invention also provides a method for producing said extraction solvent, and a method for recovering metallic elements by using said extraction solvent.