Patent holder (s):
PJSC “State Research and Design Institute of Rare-Metal Industry “Giredmet”
E.G. Goryacheva, L.V. Vdovina, V.P. Karmannikov
The invention relates to producing yttrium oxide suitable for production of ultrastrong alloys and optical ceramics. Summary of the invention: production of yttrium oxide powder having average grain size no less than 0,03 mcm. Ammonium carbonate precipitating agent solution and base nitric acid yttrium solution are mixed. Nitric acid yttrium concentration in solution is 60-80 g/l on oxide basis. Solution contains ammonium nitrate salting-out agent in amount of 3-4 n.