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A method and system for gold recovery from halogen extraction treatment

A technology for recovering gold and halogen, applied in the field of gold recovery, can solve problems such as loss of gold-loaded materials

Inactive Publication Date: 2020-06-09
DUNDEE SUSTAINABLE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Resulting in loss of gold loading material during filtration when silicon is used as the slurry

Method used

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  • A method and system for gold recovery from halogen extraction treatment
  • A method and system for gold recovery from halogen extraction treatment
  • A method and system for gold recovery from halogen extraction treatment

Examples

Experimental program
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Embodiment Construction

[0011] The invention is further illustrated by the following non-limiting examples.

[0012] In the precious metal recovery method based on precious metal precipitation of a rich solution (S1) resulting from leaching of gold and silver ores with hypohalite and having an ORP in the range of about 1100 mV to about 900 mV. The ORP of the rich solution drops below 550mV and the precious metal is released as a metallic species of gold usually with traces of silver.

[0013] Use BET specific surface area of ​​about 1m 2 / g of silicon particles allowed the collection of the metal species on the slurry of silicon particles without significant losses on the reactor walls. However, when using ferrous sulfate or sodium sulfite as reducing agent, the duration of operation is highly variable between 1 and 10 hours; moreover, process losses occur during the process.

[0014] Surprisingly, it was found that instead of the silicon slurried in the rich solution known in the art using a colle...

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PUM

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Abstract

A method and a system for gold and silver recovery from a pregnant solution resulting from gold extraction from an ore using halogen, the method comprising lowering the oxidation reduction potential of the pregnant solution by mixing the pregnant solution with a reducer over the surface of a bed of silica, and flowing the mixture through the bed of silica. The system comprises a bed of silica, a feeder controlling feeding of the pregnant solution with a reducer to direct a mixture of an ORP less than 550 mV to the surface of the bed of silica, and a collector receiving a barren solution from the bed of silica after flowing of the mixture therethrough.

Description

technical field [0001] The present invention relates to recovery of gold. More specifically, the present invention relates to a method and system for recovering gold from a rich solution derived from the extraction of gold by halogens in an ore. Background technique [0002] Extraction of gold and silver with the halogen chlorine in the presence of bromine is described, for example, in US Pat. According to this method, the extracted noble metal is dissolved in the form of a complex chloride in a salt solution of NaCl and NaBr having an oxidation-reduction potential (ORP) in the range of about 1100 mV to about 900 mV. Activated carbon cannot be used to recover noble metals from this solution because the halogens (especially bromine) react irreversibly with the carbon, preventing recovery of the reagents and leaving brominated carbons with indeterminate properties. [0003] Another method for precious metal recovery is based on the precipitation of precious metals on particl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/44
CPCC22B3/44C22B11/04Y02P10/20
Inventor 伯特兰·迪布勒伊让·马克·拉兰塞特大卫·勒米厄
Owner DUNDEE SUSTAINABLE TECH