IN-SITU GENERATION OF THIOSULPHATE LIXIVIANT SYSTEMS AND METHODS FOR PRECIOUS METAL LEACHING AND RECOVERY
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United States of America Patent
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Issued Date -
Jun 6, 2024
app pub date -
Apr 12, 2022
filing date -
Apr 13, 2021
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Abstract
A method of extracting precious metal values from a starting material using thiosulphate as a lixiviant. The precious metal values can be recovered from solution using a reductant. The reductant may be a naturally occurring ore including as a component pyrite, chalcopyrite, marcasite and/or pyrrhotite, or can be ferrous sulphate. Sodium hydrosulphide can be added as a scavenging precipitant after the reductant to regenerate thiosulphate. The thiosulphate can be recycled to leach additional precious metal values.
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