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US 2014/0112823 A1Published application
Recovery of gold from roaster calcine leach tailings
AssigneeBarrick Gold Corporation
InventorsQiankun Wang, Nathan Stubina, Wayne Douglas, Todd Esplin, Jodi Esplin, Sajan Bhakta
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Abstract
A method to recover gold lost in roaster calcine-leach tailings, due to the formation of cyanide refractory compounds or morphologies during the roasting process. The process can include acid leaching of magnetic concentrate from roaster leach tailings, combining the acid leach slurry to the pre-acidulation tank for pressure oxidation feed, acid pressure oxidation of the pressure oxidation feed, and recovery of gold.
Claims23
A process, comprising:
- magnetically separating an iron-containing magnetic concentrate from an iron-containing material;
- leaching, by a mineral acid, iron from the iron-containing magnetic concentrate to form a dissolved iron-containing leach slurry;
- contacting at least a portion of the dissolved iron-containing leach slurry with a precious metal- and carbonate-containing material;
- and
- thereafter recovering the precious metal from the precious metal- and carbonate-containing material.
2 more elements
A process, comprising:
- roasting a precious metal- and iron-containing material to form a precious metal- and iron-containing calcine;
- magnetically separating a precious metal-rich and iron-containing magnetic concentrate from the precious metal- and iron-containing calcine;
- leaching, by a mineral acid, iron from the precious metal-rich and iron-containing magnetic concentrate to form a dissolved iron-containing leach slurry;
- contacting the dissolved iron-containing leach slurry with a precious metal- and carbonate-containing material to react with at least a portion of the carbonate and form a combined feed material having a lower carbonate content than the precious metal- and carbonate-containing material;
- and
- thereafter recovering the precious metal from the precious metal- and carbonate-containing material.
3 more elements
A process, comprising:
- roasting a precious metal- and iron-containing material to form a precious metal-containing calcine;
- leaching, by a precious metal lixiviant, the precious metal-containing calcine to form a precious metal-containing pregnant leach solution and a precious metal- and iron-containing tails;
- magnetically separating a precious metal- and iron-containing magnetic concentrate from the precious metal- and iron-containing tails;
- leaching, by a mineral acid, iron from the precious metal- and iron-containing magnetic concentrate to form a dissolved iron-containing leach slurry, wherein the iron-containing leach slurry contains iron sulfate and free sulfuric acid;
- contacting the dissolved iron-containing leach slurry with a precious metal- and carbonate-containing material to form a combined autoclave feed material having a lower carbonate content than the precious metal- and carbonate-containing material;
- oxidizing the combined autoclave feed material in an autoclave;
- and
- thereafter recovering the precious metal from the precious metal- and carbonate-containing material.
5 more elements
Dependencies are inferred from the claim text.