Fusibility and density of some salt mixtures formed among NaF, AIF, (the two constituents of cvloite o r e ) and an
equimolecular haCI-KC1 mixture have been experimentally determined. It has been found that the primary crystallization
point of the mixture comes down rapidly with the addition of equirnolecular NaCI-KC1 to cryolite and goes
even below 700" when the proportion of NaC1-KC1 in the mixture is kept 50 mole percent and above. It has also been
found that the primary crystallization temperature of the salt mixture does not change significantly when the molar ratio
of NaF to AIF, in the four component salt mixture was changed from 3:1 (as in natural cryolite ore) to 3:2 The density of
thc system decreases with increasing among of NaCl -KC1 in the mixture
