Laterite Leach Tests

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ANSTO Minerals Report C1206 to Lagoon Creek Resources – Westmoreland Deposits of 1.0 g/L ferric ion at 500 mV show an initial increase in ferric ion, but the final concentration was much the same. As the leaches where iron was added achieved the same uranium extraction results after 12 h as the leaches at 550 mV, it would appear that increasing the ferric ion concentration above say 2-2.5 g/L was of little benefit. Ferric Conc. (mg/L) 3000 2500 2000 1500 1000 500 0 0 6 12 18 24 Leach Time (h) 450 mV 500 mV 550 mV 500 mV + 500 mg/L Fe FIGURE 4.14 Effect of ORP on the Ferric Concentration for Redtree Composite Ferric Ion Conc. (mg/L) 4000 3500 3000 2500 2000 1500 1000 500 0 6 12 18 24 Leach Time (h) 450 mV 500 mV 550 mV 500 mV + 500 mg/L Fe FIGURE 4.15 Effect of ORP on the Ferric Concentration for Junnagunna Composite 30
ANSTO Minerals Report C1206 to Lagoon Creek Resources – Westmoreland Deposits (iii) Effect of Grind Size The effect of grind size on uranium extraction was examined at varying P80 grind sizes of 350, 250, 150 and 75 µm under base case conditions (pH 1.5, 40 °C and ORP of 500 mV). As shown in Tables 4.3 and 4.4, the total acid addition was virtually independent of grind size for both ores. Leach residue data is shown in Figures 4.16 and 4.17. These results indicate that, compared to the base case, there was no significant benefit to be obtained from finer grinding, apart from faster initial uranium leaching kinetics, noting that a similar effect can probably be achieved by increasing the ORP. Grinding to a P80 of 350 µm significantly reduced the rate of uranium extraction up to about 12 h for the Redtree sample. On this basis a P80 of 250 µm would probably be selected to target a 12 h leach time. Uranium Leach Residue grade (ppm U3O8) 300 250 200 150 100 50 0 0 4 8 12 16 20 24 Leach Time (h) P80=350 um P80=250 um P80=150 um P80=75 um FIGURE 4.16 Effect of Grind Size on Leaching of Junnagunna Composite Uranium Leach Residue grade (ppm U3O8) 600 500 400 300 200 100 0 0 4 8 12 16 20 24 Leach Time (h) P80=350 um P80=250 um P80=150 um P80=75 um FIGURE 4.17 Effect of Grind Size on Leaching of Redtree Composite 31
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Thickening and Vacuum Filtration Ev
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Thickener Test Summary for Laramide
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Thickener Test Summary for Laramide
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