摘要
The research on the roast reaction mechanism of bastnasite concentrate mixture with Na 2CO 3 was carried out by means of thermal, X ray diffraction and chemical analyses. The isomorphous substitution, F -+Ce 3+ (Pr 3+ )→O 2- +Ce 4+ (Pr 4+ ), occurred and isomorphous mixed crystal, REO 1+x F 1-x (0< x <1), grew while roasting concentrate mixed with Na 2CO 3. REO 1+x F 1-x with different compositions were produced under different roasting conditions. It has been found that the lattice constant of REO 1+x F 1-x was a linear function of the content of fluorine: a 0=0 5499+0 00102 c F - (nm).
The research on the roast reaction mechanism of bastnasite concentrate mixture with Na 2CO 3 was carried out by means of thermal, X ray diffraction and chemical analyses. The isomorphous substitution, F -+Ce 3+ (Pr 3+ )→O 2- +Ce 4+ (Pr 4+ ), occurred and isomorphous mixed crystal, REO 1+x F 1-x (0< x <1), grew while roasting concentrate mixed with Na 2CO 3. REO 1+x F 1-x with different compositions were produced under different roasting conditions. It has been found that the lattice constant of REO 1+x F 1-x was a linear function of the content of fluorine: a 0=0 5499+0 00102 c F - (nm).
