Abrégé

Provided is an operation method of a stationary electric furnace capable of stable operation. In an operation method of a stationary electric furnace (1) in which a molten raw material (11) is tapped from a sprue (2), a melt surface level (h) of a molten metal (12) in the stationary electric furnace (1) is ascertained, and the melt surface level (h) of the molten metal (12) after tapping is managed to be equal to or higher than a predetermined height (h1) that is higher than the sprue (2).

Classes IPC  ?

• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C21B 11/10 - Fabrication de la fonte brute autrement que dans les hauts fourneaux dans des fours électriques
• C22C 1/00 - Fabrication des alliages non ferreux

Abrégé

The present invention provides a method for producing a chromium alloy containing extremely little impurities, said method using chromium ore as a starting material. This method for producing a chromium alloy comprises: a first step (S1) wherein chromium ore and calcined lime are melted; a second step (S2) wherein, to the molten starting materials (hereinafter referred to as a primary slag) melted in the first step, a reducing agent is added in an amount of from 20% by mass to 70% by mass of the theoretical reduction amount that reduces chromium oxide and iron oxide in the primary slag, and the resulting mixture is stirred, thereby producing a secondary slag and a by-product metal; and a third step (S3) wherein a reducing agent is added to the secondary slag, which has been separated from the by-product metal, and the resulting mixture is stirred, thereby producing a tertiary slag and a chromium alloy.

Classes IPC  ?

• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22C 27/06 - Alliages à base de chrome
• C22C 1/02 - Fabrication des alliages non ferreux par fusion
• C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
• C22C 38/30 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du cobalt

Abrégé

Provided is a method for producing low-carbon ferrochromium, whereby blowing up of molten raw material can be suppressed. A method for producing low-carbon ferrochromium, the method comprising tapping a molten raw material (12) obtained by melting chromium ore and quicklime as raw materials in an electric furnace, and adding a reducing agent to the molten raw material (12), wherein the method involves using a fixed-type electric furnace (1) in which a basin remains in the electric furnace after tapping. The ratio (set current/set voltage) of the set current and the set voltage of an electrode (4a) is set to 30-150 A/V (inclusive).

Classes IPC  ?

• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C22B 34/32 - Obtention du chrome

Abrégé

Provided is a self-baking electrode which can be used as an electrode in an electric furnace used to produce low-carbon ferro-chromium. The self-baking electrode (10) is formed by filling a cylindrical case (11) with an electrode paste (12), and sintering/solidifying the electrode paste (12) by Joule heating by conducting electricity and by the conductive heat from the electric furnace. The current density of the case is set to 100A/cm2to 400A/cm2, inclusive, and the self-baking electrode (10) is used as an electrode in an electric furnace used to produce low-carbon ferro-chromium.

Classes IPC  ?

• F27D 11/08 - Chauffage par décharge électrique, p. ex. décharge d'arc
• H05B 7/09 - Électrodes à auto-cuisson

Abrégé

22322) is adjusted to less than 1.3.

Classes IPC  ?

• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C22C 35/00 - Alliages-mère pour le fer ou l'acier
• C22B 9/10 - Procédés généraux d'affinage ou de refusion des métauxAppareils pour la refusion des métaux sous laitier électroconducteur ou à l'arc avec des agents d'affinage ou fondantsEmploi de substances pour ces procédés

Abrégé

The present invention provides a method for producing low carbon ferrochromium, said method being capable of reducing the electric power consumption rate by increasing the mass ratio of additionally charged chromium ore with respect to a primary slag. A method for producing low carbon ferrochromium according to the present invention is provided with: a first step (S1) wherein chromium ore and quick lime are melted in an electric furnace; and a second step (S2) wherein a molten staring material (hereinafter referred to as a primary slag) melted in the first step (S1) is discharged into a reaction container that has a gas bottom-blowing device, and a reducing agent and a cold charge that contains additional chromium ore at a mass ratio of from 10% to 100% relative to the primary slag are charged into the reaction container, so that low carbon ferrochromium and a secondary slag are produced by stirring the materials by bottom-blowing an inert gas from the gas bottom-blowing device.

Classes IPC  ?

• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C22B 9/10 - Procédés généraux d'affinage ou de refusion des métauxAppareils pour la refusion des métaux sous laitier électroconducteur ou à l'arc avec des agents d'affinage ou fondantsEmploi de substances pour ces procédés

Abrégé

2322) is brought to less than 1.3.

Classes IPC  ?

• B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C22C 35/00 - Alliages-mère pour le fer ou l'acier
• C22B 9/10 - Procédés généraux d'affinage ou de refusion des métauxAppareils pour la refusion des métaux sous laitier électroconducteur ou à l'arc avec des agents d'affinage ou fondantsEmploi de substances pour ces procédés

Produits et services

Non-ferrous metals and their alloys; Alloyed iron

Abrégé

This production method for high-quality metallic manganese comprises: adding water to a manganese-containing substance, preferably to powder particles obtained by selecting manganese dry batteries and/or alkaline manganese dry batteries from waste dry batteries and performing crushing and sieving thereon, to obtain a slurry, and subjecting the slurry to a water-rinsing treatment in which the slurry is rinsed with water; subjecting the slurry subjected to the water-rinsing treatment to a solid-liquid separation; subjecting the separated solid to a heating treatment at a heating temperature of 600ºC or more; mixing the solid subjected to the heating treatment with a reducing agent and a flux; placing the mixture in an arc melting furnace; and performing a reduction treatment to reduce the manganese-containing substance by Joule heating and/or the heat of reaction of the reducing agent, to obtain metallic manganese. The reducing agent is preferably metallic aluminum and/or metallic silicon. High-quality metallic manganese can be obtained since chlorine contained in the raw material is dissolved, separated, and removed by the water-rinsing treatment, carbon contained in the raw material is burnt and removed by the heating treatment, manganese and zinc are reduced by the arc melting furnace reduction process, and the reduced zinc is vaporized and removed.

Classes IPC  ?

• C22B 47/00 - Obtention du manganèse
• B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
• B09B 5/00 - Opérations non couvertes par une seule autre sous-classe ou par un seul autre groupe de la présente sous-classe
• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p. ex. des rognures, pour produire des métaux non ferreux ou leurs composés

Abrégé

This production method for high-quality metallic manganese comprises: rinsing powder particles (Mn-containing substance) with water to dissolve contained chlorine in water; and performing a solid-liquid separation treatment thereon to obtain a solid from which chlorine has been separated and removed. The solid thus obtained is subjected to a drying treatment. Next, the solid subjected to the drying treatment is mixed with a flux, the mixture is set into an arc melting furnace, and Joule heating is performed to slag manganese contained in the solid. Next, the molten slag obtained by the slagging is transferred to a ladle, and is subjected to a reduction treatment in which a reducing agent and a flux are put into the ladle to reduce the molten slag, and thereby obtain a molten metal (metallic manganese). As a result, high-quality metallic manganese can be produced. The Mn-containing substance used as a raw material is preferably powder particles that are obtained by selecting manganese dry batteries and/or alkaline manganese dry batteries from waste dry batteries, and performing crushing and sieving thereon.

Classes IPC  ?

• C22B 47/00 - Obtention du manganèse
• B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
• B09B 5/00 - Opérations non couvertes par une seule autre sous-classe ou par un seul autre groupe de la présente sous-classe
• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22B 7/00 - Mise en œuvre de matériaux autres que des minerais, p. ex. des rognures, pour produire des métaux non ferreux ou leurs composés

Abrégé

The present invention provides: a tungsten-containing metal production method that includes simple steps and that enables lowering of impurities content; and a tungsten-containing metal. A tungsten-containing raw material, silicon and/or aluminum as a reducing agent for reducing tungsten oxide in the tungsten-containing raw material, and a slag-making material are loaded into an electric furnace (S1). The tungsten-containing raw material is melted and reduced in the electric furnace to generate a tungsten-containing metal and slag (S2). The amount of the reducing agent is 1.0-1.5 times as much as the chemical equivalent required for reduction of tungsten oxide. The slag has a degree of basicity (CaO/SiO2) of 0.2-5.0.

Classes IPC  ?

• C22B 34/36 - Obtention du tungstène
• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22C 27/04 - Alliages à base de tungstène ou de molybdène

Abrégé

Provided is a method for producing ferrochromium, which is capable of producing ferrochromium having a low cobalt content by low-cost simple processes. A method for producing ferrochromium according to the present invention comprises: a step (S1) wherein chromium ore and calcined lime are melted in a furnace, thereby producing a synthetic slag; a step (S2) wherein a reducing agent is added into the synthetic slag so as to reduce cobalt oxide in the synthetic slag, thereby producing a cobalt-containing alloy and a slag; a step (S3) wherein the cobalt-containing alloy and the slag are separated from each other; and a step (S4) wherein a reducing agent is added into the separated slag so as to reduce molten chromium oxide, thereby producing ferrochromium.

Classes IPC  ?

• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22B 34/32 - Obtention du chrome
• C22C 27/06 - Alliages à base de chrome

Abrégé

Provided is a metal chrome fabrication method in which the chrome recovery yield can be increased and the iron content and P content of the metal chrome that is fabricated as a product can be reduced. This metal chrome fabrication method is provided with the following: a step (S1) in which chromium oxide, aluminum, and lime are put into an electric furnace as raw materials; a step (S1) in which electricity is supplied to the electric furnace, the raw materials are melted, and the chromium oxide is reduced by the aluminum to produce a first metal containing chrome and a first slag, a step (S2) in which the first slag is tapped from the electric furnace, a step (S3) in which a base flux is added to the first metal in an electric furnace, and a step (S4) in which electricity is supplied to the electric furnace, the base flux is melted, and the aluminum remaining in the first metal is oxidized and removed to produce a second metal.

Classes IPC  ?

• C22B 34/32 - Obtention du chrome
• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22B 9/10 - Procédés généraux d'affinage ou de refusion des métauxAppareils pour la refusion des métaux sous laitier électroconducteur ou à l'arc avec des agents d'affinage ou fondantsEmploi de substances pour ces procédés
• C22C 1/02 - Fabrication des alliages non ferreux par fusion
• C22C 27/06 - Alliages à base de chrome