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Elemental composition of the leaching solutions obtained under the optimum leaching conditions (1 mol L- 1 acid concentration, 25 °C, S/L ratio of 0.25 g mL-1 and agitation rate of 400 rpm during 180- and 300-min residence time for HCl and citric acid).
| mg/L | ||||||||
|---|---|---|---|---|---|---|---|---|
| Mg | Ca | Mn | Al | Fe | Ni | Cr | S | |
| HCl | 11344.88 | 776.90 | 126.95 | 150.08 | 1128.16 | 148.87 | 38.26 | 457.45 |
| Citric acid | 12469.84 | 804.28 | 118.78 | 145.31 | 1892.01 | 105.75 | 74.86 | 501.17 |
