Laterite Leach Tests

ANSTO Minerals Report C1206 to Lagoon Creek Resources – Westmoreland Deposits
significant relative increase in the acid addition. At the highest temperature, after 8 h leaching,
the rate of gangue dissolution, as reflected in the acid addition, is much greater than the
decrease in the uranium residue grade. Whereas at 30 °C, the relative rates of uranium and
gangue dissolution are still reasonably favourable after 24 h.
Residue Grade (ppm U 3O 8)
600
500
400
300
200
100
0
7 9 11 13 15 17 19 21 23 25
Acid Addition (kg/t)
Junnagunna 30ºC Junnagunna 40ºC Junnagunna 50ºC
FIGURE 4.8 Effect of Temperature on Acid Addition for Junnagunna (pH 1.5, 500
mV)
Residue Grade (ppm U3O 8)
600
500
400
300
200
100
0
6 8 10 12 14 16 18 20
Acid Addition (kg/t)
Redtree 30ºC Redtree 40ºC Redtree 50ºC
FIGURE 4.9 Effect of Temperature on Acid Addition for Redtree (pH 1.5, 500 mV)
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