METHOD FOR RECOVERING CYANIDE FROM A BARREN SOLUTION

A process is disclosed for recovering cyanide used to leach gold or silver from ore. In the course of leaching gold or silver from ore, a barren solution is generated. A portion of the barren solution containing sodium cyanide is recycled to the cyanidation process while blowdown from the barren sol...

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Bibliographic Details
Main Authors Buisson Herve, Banerjee Kashi
Format Patent
LanguageEnglish
Published 23.03.2017
Subjects
AMMONIA
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOUNDS THEREOF
CYANOGEN
FERROUS OR NON-FERROUS ALLOYS
INORGANIC CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
PRETREATMENT OF RAW MATERIALS
PRODUCTION AND REFINING OF METALS
THEIR RELEVANT APPARATUS
TRANSPORTING
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:A process is disclosed for recovering cyanide used to leach gold or silver from ore. In the course of leaching gold or silver from ore, a barren solution is generated. A portion of the barren solution containing sodium cyanide is recycled to the cyanidation process while blowdown from the barren solution is subjected to pre-treatment, UV photodissociation and pH adjustment. Ultimately, a volatile hydrocyanic acid is formed and is absorbed into a sodium hydroxide solution through the employment of a gas-filled membrane. This forms sodium cyanide that can be recycled and used in the cyanidation process to leach gold or silver from ore.
Bibliography:Application Number: US201615268731