A mixture of alumina (Al2O3) and zircon (ZrSiO4) was subjected to mech
anical milling. The presence of alumina was found to greatly enhance t
he disordering of zircon. Acid leaching of the milled oxide mixtures r
esulted in complete dissolution of the zirconium, along with a proport
ion of alumina and only traces of silica. Zirconium leaching was not p
ossible with zircon milled alone. Quantitative results of the leaching
process are given.