Methods and systems for recovering rhenium from a copper leach
View Patent ↗Various embodiments provide new methods of rhenium recovery. The methods can include subjecting a metal-bearing solution to an activated carbon bed, and adsorbing rhenium onto the activated carbon. The methods can also include heating a basic aqueous elution solution and eluting the rhenium from the activated carbon with the heated elution solution. The methods can also incorporate an ion exchange as a rhenium recovery apparatus.
1. A method for recovering rhenium, the method comprising:
feeding a metal-bearing leach solution comprising rhenium and copper over activated carbon to produce a remainder solution;
feeding said remainder solution into an ion exchange to produce an electrowinning solution;
recovering copper from the electrowinning solution; and
recovering rhenium from at least one of the activated carbon and the ion exchange.
2. The method according to claim 1 , wherein the recovering of rhenium from the activated carbon further comprises:
adsorbing said rhenium onto said activated carbon;
heating a basic aqueous solution to a temperature greater than about 105° C.; and
recovering said rhenium by eluting said rhenium from said activated carbon with said basic aqueous solution.
3. The method according to claim 2 , wherein said basic aqueous solution comprises a hydroxide salt.
4. The method according to claim 3 , wherein said hydroxide salt is at least one of sodium hydroxide, ammonium hydroxide, lithium hydroxide, and potassium hydroxide.
5. The method according to claim 3 , wherein said hydroxide salt is present in said basic aqueous solution in an amount from about 0.2% to about 5%.
6. The method according to claim 3 , wherein said hydroxide salt is sodium hydroxide in an amount from about 0.5% to about 2.5%.
7. The method according to claim 2 , wherein said rhenium eluted from said activated carbon is greater than about 95% of rhenium in said metal-bearing leach solution.
8. The method according to claim 2 , wherein the basic aqueous solution is heated to a temperature from about 105° C. to about 115° C.
9. The method according to claim 2 , wherein the basic aqueous solution is heated to a temperature from about 108° C. to about 110° C.
10. The method according to claim 1 , further comprising leaching a metal-bearing material to yield said metal-bearing each solution.
11. The method according to claim 1 , wherein said leach solution comprises less than 1 mg/L rhenium.