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1. WO2009141565 - METHOD FOR TREATING AN ASBESTOS SOLID

Publication Number WO/2009/141565
Publication Date 26.11.2009
International Application No. PCT/FR2009/050837
International Filing Date 06.05.2009
Chapter 2 Demand Filed 01.06.2010
IPC
A62D 3/36 2007.1
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
30by reacting with chemical agents
36Detoxification by using acid or alkaline reagents
CPC
A62D 2101/41
AHUMAN NECESSITIES
62LIFE-SAVING; FIRE-FIGHTING
DCHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
2101Harmful chemical substances made harmless, or less harmful, by effecting chemical change
40Inorganic substances
41Inorganic fibres, e.g. asbestos
A62D 3/36
AHUMAN NECESSITIES
62LIFE-SAVING; FIRE-FIGHTING
DCHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; 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
30by reacting with chemical agents
36Detoxification by using acid or alkaline reagents
C22B 3/10
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
3Extraction of metal compounds from ores or concentrates by wet processes
04by leaching
06in inorganic acid solutions ; , e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
10Hydrochloric acid ; , other halogenated acids or salts thereof
C22B 3/44
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
3Extraction of metal compounds from ores or concentrates by wet processes
20Treatment or purification of solutions, e.g. obtained by leaching
44by chemical processes
C22B 7/007
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
007by acid leaching
Y02P 10/20
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
10Technologies related to metal processing
20Recycling
Applicants
  • INSTITUT NATIONAL POLYTECHNIQUE DE TOULOUSE (INPT) [FR]/[FR] (AllExceptUS)
  • DENIS, Ghislain [FR]/[FR] (UsOnly)
  • DELMAS, Michel [FR]/[FR] (UsOnly)
Inventors
  • DENIS, Ghislain
  • DELMAS, Michel
Agents
  • CABINET BARRE LAFORGUE & ASSOCIES
Priority Data
08/0254607.05.2008FR
Publication Language French (fr)
Filing Language French (FR)
Designated States
Title
(EN) METHOD FOR TREATING AN ASBESTOS SOLID
(FR) PROCEDE DE TRAITEMENT D'UN SOLIDE AMIANTE
Abstract
(EN) The invention relates to a method for treating an asbestos solid (1), said method comprising at least one hot acid treatment step (4) for treating the asbestos (3) of the asbestos solid (1) at atmospheric pressure with an aqueous solution (5) of hydrochloric acid at a temperature close to the boiling temperature of the aqueous solution (5) of hydrochloric acid, in such a way as to obtain a so-called non-silicic solution (8) of at least one non-silicic constituent of the asbestos (3) in the aqueous solution (5) of hydrochloric acid and a so-called silicic solid (9). Said method is characterised in that the non-silicic solution (8) is subjected to a so-called precipitation treatment (13), wherein a selective precipitation (13) of the cationic species of iron present in said non-silicic solution (8) is carried out.
(FR) L'invention concerne un procédé de traitement d'un solide amiante (1), comprenant au moins une étape de traitement, dit traitement acide à chaud (4), de l'amiante (3) du solide amiante (1) à pression atmosphérique par une solution aqueuse (5) d'acide chlorhydrique à une température voisine de la température d'ébullition de la solution aqueuse (5) d'acide chlorhydrique de façon à obtenir, une solution, dite solution non silicique (8), d'au moins un constituant non silicique de l'amiante (3) dans la solution aqueuse (5) d'acide chlorhydrique et un solide, dit solide silicique (9), caractérisé en ce qu'on soumet la solution non silicique (8) à un traitement, dit traitement de précipitation (13), dans lequel on réalise une précipitation (13) sélective des espèces cationiques du fer, présentes dans cette solution non silicique (8).
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