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1. WO2000043558 - CYANIDE RECOVERY FROM AQEUOUS ORE PROCESSING SOLUTIONS BY SOLVENT EXTRACTION

Publication Number WO/2000/043558
Publication Date 27.07.2000
International Application No. PCT/CA2000/000053
International Filing Date 21.01.2000
Chapter 2 Demand Filed 24.06.2000
IPC
A62D 3/00 2007.01
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
C02F 1/26 2006.01
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
26by extraction
C22B 3/38 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
3Extraction of metal compounds from ores or concentrates by wet processes
20Treatment or purification of solutions, e.g. obtained by leaching
26by liquid-liquid extraction using organic compounds
38containing phosphorus
C22B 11/08 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
11Obtaining noble metals
08by cyaniding
CPC
C02F 1/26
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
26by extraction
C22B 11/08
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION AND REFINING OF METALS
11Obtaining noble metals
08by cyaniding
C22B 3/0043
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
0004Treatment or purification of solutions, e.g. obtained by leaching
0005by liquid-liquid extraction using organic compounds, e.g. acyclic or carbocyclic compounds, heterocyclic compounds, organo- metallic compounds, alcohols, ethers, or the like
004using organo-metallic compounds or organo compounds of boron, silicon, phosphorus, selenium or tellurim
0041using organo-metallic compounds of a single type
0043using phosphorus-based acid derivatives
C22B 3/0063
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
0004Treatment or purification of solutions, e.g. obtained by leaching
0005by liquid-liquid extraction using organic compounds, e.g. acyclic or carbocyclic compounds, heterocyclic compounds, organo- metallic compounds, alcohols, ethers, or the like
004using organo-metallic compounds or organo compounds of boron, silicon, phosphorus, selenium or tellurim
0041using organo-metallic compounds of a single type
0043using phosphorus-based acid derivatives
0044of a single type
0045Acyclic compounds
0063Mononuclear oxyacids of pentavalent phosphorus or their esters(-ate)
Y02P 10/234
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
20Process efficiency
21by recovering materials
212Recovering metals from waste
234by hydro metallurgy
Y10S 210/903
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
210Liquid purification or separation
902Materials removed
903Nitrogenous
Applicants
  • PLACER DOME INC. [CA/CA]; 1400 - 1055 Dunsmuir Street Vancouver, British Columbia V7X 1P1, CA (AllExceptUS)
  • DREISINGER, David, Bruce [CA/CA]; CA (UsOnly)
Inventors
  • DREISINGER, David, Bruce; CA
Agents
  • KINGWELL, Brian, G. ; Smart & Biggar Box 11560, Vancouver Centre Suite 2200 650 West Georgia Street Vancouver, British Columbia V6B 4N8, CA
Priority Data
09/235,87622.01.1999US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CYANIDE RECOVERY FROM AQEUOUS ORE PROCESSING SOLUTIONS BY SOLVENT EXTRACTION
(FR) RECUPERATION DE CYANURE DE SOLUTIONS AQUEUSES DE TRAITEMENT DE MINERAI PAR EXTRACTION DE SOLVANT
Abstract
(EN)
The invention provides a process for recovering hydrogen cyanide from an aqueous solution by extracting the hydrogen cyanide into an organic solvent phase. The organic solvent may comprise neutral organophosphorous compounds, such as compounds selected from the group consisting of alkyl or aryl substituted phosphates, phosphonates and phosphine oxides. In alternative embodiments the organophosphorous compound is tri-butyl phosphate, di-butyl-butyl-phosphonate or tri-alkyl phosphine oxides. The organic solvent may be diluted in an organic diluent, such as an aliphatic or kerosene-type diluent. Alternative dilutions may be used, such as 75 %, 50 % or 25 %. In some embodiments, the pH of the aqueous solution containing dissolved cyanide may be adjusted to between 2 and 8, or between 3 and 7, or between 4 and 6. The organic solvent may be contacted following extraction with a basic aqueous solution to strip cyanide from the organic solvent into a basic aqueous cyanide strip solution. The stripped organic solvent may then be returned to the loading process, to extract HCN from fresh aqueous solution. The aqueous solution is typically an aqueous ore processing waste solution, in paticular a gold ore cyamide reaching waste solution.
(FR)
L'invention concerne un procédé de récupération d'acide cyanhydrique d'une solution aqueuse par extraction de l'acide cyanhydrique pour obtenir une phase de solvant organique. Le solvant organique peut comprendre des composés neutres organophosphorés, par exemple des composés sélectionnés dans le groupe comprenant des phosphates, des phosphonates et des oxydes de phosphine substitués par alkyle ou aryle. Dans d'autres modes de réalisation, le composé organophosphoré est un phosphate tri-butyle, un phosphonate di-butyl-butyle ou un oxyde de phosphine tri-alkyle. Le solvant organique peut être dilué dans un diluant organique, tel qu'un diluant aliphatique ou un diluant de type kérosène. On peut utiliser d'autres dilutions, par exemple à 75 %, 50 % ou 25 %. Dans certains modes de réalisation, le pH de la solution aqueuse contenant du cyanure dissous peut être modulé entre 2 et 8, entre 3 et 7, ou entre 4 et 6. La solution aqueuse est généralement une solution aqueuse de déchets de traitement de minerai, en particulier une solution de déchets de lixiviation par cyanuration de minerai d'or. Le solvant organique peut être mis en contact avec une solution aqueuse de base afin d'en extraire le cyanure, pour obtenir une solution aqueuse de base d'extraction de cyanure. Le solvant organique ayant subi l'extraction peut alors être renvoyé au procédé de charge, afin d'extraire l'acide cyanhydrique (HCN) de la solution aqueuse fraîche.
Also published as
ZA200002323
Latest bibliographic data on file with the International Bureau