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US 8,894,740 B2Granted
Process for the recovery of gold from an ore in chloride medium with a nitrogen species
AssigneeNeomet Technologies Inc.
InventorsBryn Harris, Carl White
Life of this patent
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Abstract
A process and system for recovery of gold from an ore having the steps of i) providing the ore containing the gold to be recovered, ii) leaching the ore in an oxidative chloride medium, including a nitrogen species to produce a solution comprising gold; and iii) recovering the gold from the solution. The gold in a preferred embodiment is recovered from refractory and carbonaceous ores.
Claims9
A cyanide-free process for recovery of gold from an ore comprising the steps of:
- i) providing the ore comprising the gold to be recovered;
- ii) leaching the ore in a chloride oxidative medium, comprising nitric acid to produce a chloride solution comprising gold;
- and
- iii) recovering the gold from the chloride solution, wherein recovering the gold from the chloride solution is made by
- iv) contacting the chloride solution comprising gold with a resin adsorbent to selectively adsorb the gold and produce a barren solution and a loaded resin adsorbent;
- and
- v) stripping the gold from the loaded resin adsorbent by elution with diluted hydrochloric acid,
- wherein the barren solution is treated with a matrix solution to produce the chloride medium which is recycled to step ii), and hematite.
5 more elements
Dependencies are inferred from the claim text.