Laterite Leach Tests

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ANSTO Minerals Report C1206 to Lagoon Creek Resources – Westmoreland Deposits U 3O 8 in bulk eluate, mg/L 12.0 10.0 8.0 6.0 4.0 2.0 0.0 0 5 10 15 20 V eluant (BV) Bulk eluate: Amberjet 4400 Bulk eluate: Ambersep 920 Acid used: Amberjet 4400 Acid used: Ambersep 920 FIGURE 6.12 Uranium Bulk Eluate Concentrations from Ambersep and Amberjet Resins (1 M Sulphuric Acid, 35 o C) 6.2.7 Uranyl Peroxide Precipitation Portions of each eluate generated from the two resins were collected and used for the precipitation of uranyl peroxide to provide an indication of the impurity deportment from the eluate to the final solids. The conditions for this test were based on previous experience gained by ANSTO Minerals, but no optimisation was conducted at this stage. The method and results are contained in Appendix L and is based on a two stage process where gypsum (pH 1.5) and iron hydroxide (pH 3.5) were precipitated first and removed, prior to uranyl peroxide precipitation using hydrogen peroxide at pH 3.5 and 35 o C according to equation (7). UO2(SO4)3 + H2O2 + 2NaOH + xH2O → UO4.xH2O + 2H2SO4 + Na2SO4 (7) Fractions 2-10 of the Ambersep 920 eluate and fractions 2-15 of the Amberjet eluate were used for the precipitation tests to generate solutions containing 5 – 5.5 g/L U3O8 and provide 1.6 g and 2.7 g of uranium, as U3O8, for precipitation. The quantities of uranium were relatively small, but only sufficient product for analysis was required. The gypsum/Fe(OH)3 solids waste was assayed by XRF and the uranyl peroxide precipitate was assayed by digesting it in nitric acid and diluting the solution to an exact volume. Elements were determined by ICP-OES and ICP-MS. The uranyl peroxide compositions are contained in Table 6.7. The uranium composition of the uranyl peroxide indicates that the precipitate stoichiometry was very close to UO4.2H2O (theoretical = 70.4% U). In Table 6.9, the impurity compositions are also compared with various commercial specifications for uranyl peroxide. Iron nearly met specification, but phosphorous exceeded specifications and more attention needs to be paid to managing it. Previous work at ANSTO has shown that phosphorous can precipitate 45 40 35 30 25 20 15 10 5 0 Acid Consumption, g H 2SO 4/g U3O8 62
ANSTO Minerals Report C1206 to Lagoon Creek Resources – Westmoreland Deposits with the gypsum/Fe(OH)3 cake to some degree, the conditions of this process need to be examined and optimised to achieve maximum rejection as iron phosphate, while maintaining low uranium losses. Alternatively, as mentioned in Section 6.2.3, scrubbing operations prior to elution may provide a solution. Element Ambersep TABLE 6.9 Uranyl Peroxide Compositions (expressed as M/U%) 920U Amberjet 4400 No penalty Cameco Comurhex Converdyn Limit of Rejection No penalty Limit of Rejection No penalty Limit of Rejection Ag
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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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