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US 2013/0220079 A1Published application
Process for the recovery of gold from an ore in chloride medium with a nitrogen species
AssigneeNeomet Technologies Inc.
InventorsBryn Harris, Carl White
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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.
Claims13
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.
- 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.
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A system for recovering gold from a chloride solution with a nitrogen species, the system comprising:
- a oxidative pressure leach reactor comprising
- inlets for a gold containing ore, an oxygen containing gas and a HCl acid;
- and
- an outlet for a chloride leach slurry produced in the reactor;
- a solid liquid separator hydraulically connected to the leach reactor with an inlet for the leach chloride slurry, the separator separating the slurry into a gold bearing chloride solution at a gold bearing chloride solution outlet and undissolved solids;
- and
- a gold ion exchange system comprising
- at least one column comprising a gold adsorbing ion exchange resin compatible with chloride solutions and regenerated with HCl, wherein the at least one column is hydraulically connected to the gold bearing solution outlet and produce a barren gold solution at a barren solution outlet,
- wherein barren solution outlet is hydraulically linked to a HCl recovery system comprising a circulating matrix solution and an injection inlet for an oxygen containing gas.
6 more elements
Dependencies are inferred from the claim text.