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Q. Show the chemical properties of Uranium?
Uranium is mainly extracted from pitchblende. The concentrated ore (pitchblende, U3O8) is washed and then fused with sodium nitrate and sodium carbonate. The fused pass in treated with sulphuric acid, which extracts uranyl sulphate, U02S04. Addition of sodium carbonate solution in excess to the above solution, removes all the heavy metals as carbonates. Uranium goes in solution as sodium uranyl carbonate Na4 [U02(C03)3]. Addition of dilute toH2SO4 the dradyl carbonate solution precipitates uranium as sodium diuranate, Na2U207which on treatment with concentrated solution of (NH4)2C03 passes into solution as ammonium uranyl carbonate, (NH4)4[U02 (C03)3]. Concentration of this solution gives pure U3Os. Reduction of U308 with aluminium powder produces uranium metal. All these steps - involved in extraction of uranium from pitchblende are summarised in a flow sheet.
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