· Modern hydrometallurgical flowsheets all comprise three essential steps for the recovery of copper: leaching, followed by solvent extraction and electrowinning. Leaching involves dissolving Cu 2+ (or Cu + ) from coppercontaining minerals into an aqueous H 2 SO 4 solution, known as the lixiviant, to produce a pregnant leach solution (PLS).
Nov 24, 2016 · Uranium Precipitation Process. The pregnant eluate and soda ash solutions from the Ion Exchange and Solvent Extractions systems are combined in a 12′ x 16′ propeller agitated tank. The pH is adjusted to with sulfuric acid. Steam is added to bring solution to the boiling point to drive off CO2.