Pb-Zn recovery from a malic leach solution of a carbonate …
They reported that at an optimum condition, 90% of Zn can be extracted from a carbonate type Pb-Zn flotation tailing with malic acid, which was very close to the 90.6% extraction that was achieved with citric acid at its optimum condition. The use of malic acid also showed a higher leaching selectivity against Fe compared to using citric acid.