Dysprosium precipitation from

Note that the composition assigned to the amorphous phase disagrees with the composition of the equilibrium phase at 373 K. As an amorphous phase is apparently formed when dysprosium selenite is precipitated from aqueous solution at 298 K, the result of this investigation is included in the review but not selected. 

Figure 4. Precipitation of dysprosium from simulated waste as a function of oxalate ion concentration...

Yttrium is one of the most abundant rare earth elements and its purification is easily accomplished. Yttrium fractions from a bromate series are freed from dysprosium, holmium, and erbium by fractional precipitation with ammonia, K2OO4, or NaNC>2. The latter is probably the most effective. Yttrium salts give no absorption lines ini the viable portion of the spectrum, consequently the removal of holmium and erbium is easily observed by the direct vision spectroscope. 

---