System and method including multi-circuit solution extraction for recovery of metal values from metal-bearing materials
The present disclosure relates to a metal recovery process comprising a solvent extraction process. In an exemplary embodiment, the solution extraction system comprises a plant with a first and second circuit. A high-grade pregnant leach solution (“HGPLS”) is provided to the first and second circuit, and a low-grade pregnant leach solution (“LGPLS”) is provided to the second circuit. The first circuit produces a rich electrolyte, which can be forwarded to a primary metal recovery, and a low-grade raffinate, which can be forwarded to a secondary metal recovery process. The second circuit produces a rich electrolyte, which can also be forwarded to the primary metal recovery process. The first and second circuits are in fluid communication with each other.
1. A method for extracting metal value comprising:
preparing a first metal-bearing material;
preparing a second metal-bearing material;
performing a first reactive process on the first metal-bearing material to make a first HGPLS;
performing a second reactive process on the second metal-bearing material to make a second HGPLS; and
performing a solution extraction process comprising forwarding the first HGPLS to a first circuit of a solution extraction plant, and forwarding the second HGPLS to a second circuit of the solution extraction plant, wherein the first circuit of the solution extraction plant and the second circuit of the solution extraction plant are in fluid communication with each other.
2. The method of claim 1 , wherein the first circuit of the solution extraction plant comprises at least two first circuit extractors, one first circuit stripping unit and operates under a first set of chemical conditions, and wherein the second circuit of the solution extraction plant comprises at least two second circuit extractors, one second circuit stripping unit, and operates under a second set of chemical conditions.
3. The method of claim 2 , wherein the first set of chemical conditions and the second set of chemical conditions are not the same.
4. The method of claim 1 , wherein the first reactive process and the second reactive process are not the same.
5. The method of claim 1 , further comprising:
extracting, using the first circuit of the solution extraction plant, a first circuit electrolyte;
extracting, using the second circuit of the solution extraction plant, a second circuit electrolyte;
forwarding the first circuit electrolyte to a primary electrowinning unit; and
forwarding the second circuit electrolyte to a secondary electrowinning unit.
6. The method of claim 1 , further comprising:
conditioning the first HGPLS with a first set of reagents; and
conditioning the second HGPLS with a second set of reagents, wherein the first set of reagents and the second set of reagents are not the same.
7. The method of claim 1 , wherein the first HGPLS and the second HGPLS comprise copper.
8. The method of claim 2 , wherein at least one of the first unit extractors produces a raffinate, the first circuit stripping unit receives an electrolyte, and wherein the raffinate comprises a higher concentration of metal than the electrolyte.
9. A system for extracting metal value comprising:
a first HGPLS;
a second HGPLS; and
a solution extraction plant comprising a first circuit and a second circuit, wherein the first circuit comprises a plurality of first circuit extractors, at least one first circuit stripping unit, and operates under a first set of chemical conditions, and wherein the second circuit comprises a plurality of second circuit extractors, at least one second circuit stripping unit, and operates under a second set of chemical conditions, and wherein the first circuit and the second circuit are in fluid communication.
10. The system of claim 9 , further comprising forming a first circuit electrolyte by a first circuit stripper and forming a second circuit electrolyte by a second circuit stripper.
11. The system of claim 10 , further comprising forwarding the first circuit electrolyte to a primary electrowinning unit and forwarding the second circuit electrolyte to a secondary electrowinning unit.