Copper recovery circuit
View Patent ↗The present invention relates generally to a process for controlled leaching and sequential recovery of two or more metals from metal-bearing materials. In one exemplary embodiment, recovery of metals from a leached metal-bearing material is controlled and improved by providing a high grade pregnant leach solution (“HGPLS”) and a low grade pregnant leach solution (“LGPLS”) to a single solution extraction plant comprising at least two solution extractor units, at least two stripping units, and, optionally, at least one wash stage.
1. A method comprising:
producing a high grade pregnant leach solution and a low grade pregnant leach solution, wherein said low grade pregnant leach solution has a lower concentration of a metal value than said high grade pregnant leach solution;
subjecting said low grade pregnant leach solution to a first extractor to produce a partially loaded organic solution; and
subjecting said high grade pregnant leach solution to a second extractor to produce a metal-loaded solution by contacting said high grade pregnant leach solution with said partially loaded organic solution.
2. The method of claim 1 , further comprising creating said high grade pregnant leach solution by subjecting a product slurry to solid liquid phase separation.
3. The method of claim 1 , wherein said metal value is stripped from said metal-loaded solution in a stripping unit.
4. The method of claim 3 , wherein a barren organic solution is produced by said stripping unit.
5. The method of claim 2 , wherein said product shiny is created by a reactive process.
6. The method of claim 5 , wherein a high grade raffinate is produced by said second extractor and wherein said high grade raffinate is recycled to said reactive process.
7. The method of claim 1 , wherein a low grade raffinate is produced by said first extractor wherein said wherein said low grade raffinate comprises a secondary metal value.
8. The method of claim 7 , wherein said low grade raffinate is subjected to secondary metal recovery processing.
9. The method of claim 7 , wherein said secondary metal value is selected from the group consisting of gold, silver, platinum group metals, molybdenum, zinc, nickel, cobalt, uranium, rhenium, rare earth metals, and actinide metals.
10. A method comprising:
producing a high grade pregnant leach solution and a low grade pregnant leach solution, wherein said low grade pregnant leach solution has a lower concentration of a metal value than said high grade pregnant leach solution;
subjecting said low grade pregnant each solution to a first extractor to produce a partially loaded organic solution by contacting said low grade pregnant leach solution with a barren organic solution; and
subjecting said high grade pregnant leach solution to a second extractor to produce a metal-loaded solution by contacting said high grade pregnant leach solution with said partially loaded organic solution.
11. The method of claim 10 , wherein said first extractor and said second solution extractor are in a solution extraction plant.
12. The method of claim 10 , further comprising adding a metal-specific extraction reagent to said barren organic solution prior to contacting with said low grade pregnant leach solution.
13. The method of claim 10 , wherein said high grade pregnant leach solution is generated from at least one of an atmospheric leaching process, a pressure leaching process, an agitation leaching process, a heap leaching process, a stockpile leaching process, a pad leaching process, a thin-layer leaching process, and a vat leaching process.
14. The method of claim 10 , wherein a low grade raffinate is created by said first extractor and further comprising subjecting said low grade raffinate to secondary metal recovery processing.
15. The method of claim 14 , wherein said low grade raffinate comprises a secondary metal selected from the group consisting of silver, platinum group metals, molybdenum, zinc, nickel, cobalt, uranium, rhenium, rare earth metals, and actinide metals.
16. A method comprising:
producing a high grade pregnant leach solution and a low grade pregnant leach solution, wherein said low grade pregnant leach solution has a lower concentration of a metal value than said high grade pregnant leach solution;
subjecting said low grade pregnant leach solution to a first extractor to produce a first partially loaded organic solution;
subjecting said first partially loaded organic solution to a second extractor to produce a second partially loaded organic solution and
subjecting said high grade pregnant leach solution to a third extractor to produce a metal-loaded solution by contacting said high grade pregnant leach solution with said second partially loaded organic solution.
17. The method of claim 16 , wherein said first extractor, said second extractor, and said third extractor are in the same solution extraction plant.
18. The method of claim 16 , further comprising stripping said metal-loaded solution in a first stripping unit to a produce a depleted organic solution.
19. The method of claim 18 , further comprising stripping said depleted organic solution in a second stripping unit to create a barren organic solution.
20. The method of claim 19 , receiving, by said first extractor, said barren organic solution.