7. Purification of scandium halide (ScCl3)
Scandium halide is obtained by attacking scandine with HCl. Its purification can be carried out :
by fractional vapo-metallurgy of scandium chloride at around 970°C before sublimation, and thorium and rare earth chlorides at higher temperatures;
by exchange resins or solvents, applied to the aqueous solution of ScCl 3 , depending on scandium concentrations. For low concentrations, scandium is extracted by column resins such as Dowex 50 W, a polystyrene resin with an ionic-SO 3 group and usable at any pH (between 0 and 14); citric acid or an aminoacetic acid is employed as the elution solution. For Sc contents above a few g/L, ether-type solvents are effective after prior treatment of the hydrochloric solution, to be purified with...
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Purification of scandium halide (ScCl3)
Production of scandium metal and Al-Sc alloy
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