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1. ES2341621 - PROCEDIMIENTO DE EXTRACCION DE CROMO HEXAVALENTE.

Office
Spain
Application Number 06731655
Application Date 12.04.2006
Publication Number 2341621
Publication Date 23.06.2010
Publication Kind T3
IPC
B09B 3/00
BPERFORMING OPERATIONS; TRANSPORTING
09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
BDISPOSAL OF SOLID WASTE
3Destroying solid waste or transforming solid waste into something useful or harmless
A62D 3/00
AHUMAN NECESSITIES
62LIFE-SAVING; FIRE-FIGHTING
DCHEMICAL MEANS FOR EXTINGUISHING FIRES; PROCESSES FOR MAKING HARMFUL CHEMICAL SUBSTANCES HARMLESS, OR LESS HARMFUL, BY EFFECTING A CHEMICAL CHANGE; COMPOSITION OF MATERIALS FOR COVERINGS OR CLOTHING FOR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; COMPOSITION OF MATERIALS FOR TRANSPARENT PARTS OF GAS-MASKS, RESPIRATORS, BREATHING BAGS OR HELMETS; COMPOSITION OF CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
3Processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances
CPC
C01G 37/00
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
37Compounds of chromium
C01G 37/003
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
37Compounds of chromium
003Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange
C22B 5/00
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
C22B 7/006
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
7Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; ; Methods of a general interest or applied to the winning of more than two metals
006Wet processes
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
C23C 22/86
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
22Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
86Regeneration of coating baths
Applicants YOSHIDA HIDEO
Inventors SHINDO MORIHISA
Priority Data 2005144858 18.05.2005 JP
Title
(ES) PROCEDIMIENTO DE EXTRACCION DE CROMO HEXAVALENTE.
Abstract
(ES) Un procedimiento de extracción de cromo hexavalente a partir de una materia prima o una pieza de trabajo que tiene una película de placa de cromo o cromato en la superficie de la misma, en el que el cromo hexavalente queda en la superficie de la película o en el interior de la película, comprendiendo el procedimiento las etapas de: inmersión de la pieza de trabajo (3) en un electrolito (4) recibido en vaso de reacción (1), aplicación de una tensión positiva o negativa suministrada desde una fuente eléctrica (8) a dicha pieza de trabajo, movimiento del cromo hexavalente extraído de dicha película en el electrolito, carga del agente reductor (9) en el vaso de reacción (1) coincidiendo con o antes de mover el cromo hexavalente en el electrolito, y puesta en contacto de dicho cromo hexavalente con el agente reductor (9) de manera que se reduzca el cromo hexavalente extraído a un cromo trivalente.