Laterite Leach Tests

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ANSTO Minerals Report C1206 to Lagoon Creek Resources – Westmoreland Deposits vi coarsest fractions. Residue grades were greatest, marginally, for the three finest fractions. Even though extractions were lowest for the coarsest fractions for both ores, finer grinding is not recommended as these lower extractions were a function of the reduced head grades in these fractions. Bulk <strong>Leach</strong> The bulk leach was conducted according to conditions selected from the optimisation studies. These parameters were: Temperature: 40 o C pH: 1.5 Grind size: P80 250 µm Duration: 12 h Oxidant: pyrolusite ORP: 550 mV Approximately 60 kg of solids were used in the bulk leach. The solids were a composite of the three ores tested in the leaching studies. The uranium extraction was 96.2%, which was higher than the expected extraction of ~95.6% (calculated from the extractions from similar tests conducted on the individual ore types). It is likely that the uranium extraction from the Jack component of the composite was higher than for the tests conducted on Jack ore due to the elevated ORP and ferric ion concentration. The uranium extraction was complete in 8 hours. The acid and oxidant consumptions were higher than expected in the bulk leach. The acid addition, at 23.7 kg/t, was higher than in any of the previous tests with the exception of test LC4 A, which was a test on Redtree ore at pH 1.3. The oxidant addition was also higher at 6.4 kg/t. The likely reasons for the higher consumptions were due to the high ORP, and that the material for the bulk leach was ground by Metcon in a mild steel mill with mild steel balls. It is likely that some of the steel reported to the ground material and leached, consuming both oxidant and acid. The bulk leach had the highest iron level in solution of any test. Ion Exchange Testwork Ambersep 920 and Amberjet 4400 were used to recover uranium from the bulk leach liquor. The Ambersep represented a large bead ‘resin-in-pulp’ resin, which would be used for recovery directly from leach slurry, and Amberjet was used to recover uranium from clarified leach liquor after a CCD operation. The Ambersep 920 and Amberjet 4400 resins successfully removed uranium and demonstrated uranium loadings of 45 and 78 g/L wsr, respectively, in a column loading experiment. Both resins also demonstrated satisfactory loading and elution kinetics and were able to be completely eluted by ≤ 15 BV of eluant in a column strip experiment. In elution, iron (III) and phosphorous impurities were eluted along with uranium.
ANSTO Minerals Report C1206 to Lagoon Creek Resources – Westmoreland Deposits vii In precipitates produced by direct precipitation of uranyl peroxide from the partially neutralised eluate (from which gypsum and iron hydroxide had been removed), both iron and phosphorous were close to specification impurity limits. Solvent Extraction Testwork A McCabe-Thiele diagram indicated that a two stage extraction process operating at 85% efficiency, with an A/O = 4.3 was sufficient to extract 99% of the uranium from a feed of 970 mg/L U resulting in a raffinate with
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Thickening and Vacuum Filtration Ev
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Thickener Test Summary for Laramide
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Laterite Leach Tests

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