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1. CA2960711 - PROCEDES DE PRODUCTION DE CHROME METALLIQUE ET D'ALLIAGES CONTENANT DU CHROME A FAIBLE TENEUR EN AZOTE ET PRODUITS AINSI OBTENUS

Office
Canada
Numéro de la demande 2960711
Date de la demande
Numéro de publication 2960711
Date de publication 14.07.2016
Type de publication A1
CIB
C22B 34/32
CCHIMIE; MÉTALLURGIE
22MÉTALLURGIE; ALLIAGES FERREUX OU NON FERREUX; TRAITEMENT DES ALLIAGES OU DES MÉTAUX NON FERREUX
BPRODUCTION OU AFFINAGE DES MÉTAUX; TRAITEMENT PRÉLIMINAIRE DES MATIÈRES PREMIÈRES
34Obtention des métaux réfractaires
30Obtention du chrome, du molybdène ou du tungstène
32Obtention du chrome
C22B 5/04
CCHIMIE; MÉTALLURGIE
22MÉTALLURGIE; ALLIAGES FERREUX OU NON FERREUX; TRAITEMENT DES ALLIAGES OU DES MÉTAUX NON FERREUX
BPRODUCTION OU AFFINAGE DES MÉTAUX; TRAITEMENT PRÉLIMINAIRE DES MATIÈRES PREMIÈRES
5Procédés généraux de réduction appliqués aux métaux
02par voie sèche
04par l'aluminium, d'autres métaux ou le silicium
C22B 9/04
CCHIMIE; MÉTALLURGIE
22MÉTALLURGIE; ALLIAGES FERREUX OU NON FERREUX; TRAITEMENT DES ALLIAGES OU DES MÉTAUX NON FERREUX
BPRODUCTION OU AFFINAGE DES MÉTAUX; TRAITEMENT PRÉLIMINAIRE DES MATIÈRES PREMIÈRES
9Procédés généraux d'affinage ou de refusion des métaux; Appareils pour la refusion des métaux sous laitier électroconducteur ou à l'arc
04Affinage par traitement sous vide
CPC
C22B 5/04
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
5General methods of reducing to metals
02Dry methods ; smelting of sulfides or formation of mattes
04by aluminium, other metals or silicon
C22B 9/04
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
9General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
04Refining by applying a vacuum
C22B 34/32
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
34Obtaining refractory metals
30Obtaining chromium, molybdenum or tungsten
32Obtaining chromium
C22C 19/05
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
19Alloys based on nickel or cobalt
03based on nickel
05with chromium
C22C 27/06
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
27Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
06Alloys based on chromium
C22C 1/06
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
1Making alloys
06with the use of special agents for refining or deoxidising
Déposants CBMM-COMPANHIA BRASILEIRA DE METALURGIA E MINERACAO
Données relatives à la priorité 14533741 05.11.2014 US
Titre
(EN) PROCESSES FOR PRODUCING LOW NITROGEN METALLIC CHROMIUM AND CHROMIUM-CONTAINING ALLOYS AND THE RESULTING PRODUCTS
(FR) PROCEDES DE PRODUCTION DE CHROME METALLIQUE ET D'ALLIAGES CONTENANT DU CHROME A FAIBLE TENEUR EN AZOTE ET PRODUITS AINSI OBTENUS
Abrégé
(EN) Processes for producing low-nitrogen metallic chromium or chromium-containing alloys, which prevent the nitrogen in the surrounding atmosphere from being carried into the melt and being absorbed by the metallic chromium or chromium-containing alloy during the metallothermic reaction, include vacuum-degassing a thermite mixture comprising metal compounds and metallic reducing powders contained within a vacuum vessel, igniting the thermite mixture to effect reduction of the metal compounds within the vessel under reduced pressure i.e., below 1 bar, and conducting the entire reduction reaction in said vessel under reduced pressure, including solidification and cooling, to produce a final product with a nitrogen content below 10 ppm. The final products obtained, in addition to low-nitrogen metallic chromium in combination with other elements, can be used as raw materials in the manufacture of superalloys, stainless steel and other specialty steels whose final content of nitrogen is below 10 ppm.