PROCESSES OF MANUFACTURING A DOUBLE OXALATE FROM RARE LANDS AND AMMONIUM AND MANUFACTURING FROM RARE LAND OXIDE

摘要

Process for the manufacture of an ammonium rare-earth oxalate consisting in mixing, in an aqueous medium, compounds capable of releasing oxalate ions with a salt of soluble rare earths and an ammonium salt such as ammonium nitrate. The precipitate is then isolated and washed. The double oxalate obtained is converted into yttrium oxide by calcining.