Patent ID: 7628970

Claim:
A method of preparing a feedstock liquid used for production of ammonium diuranate particles, which comprises mixing a uranyl nitrate solution and tetrahydrofurfuryl alcohol to produce a uranyl nitrate mixture (X), dissolving polyvinyl alcohol in water at a temperature of 75° C. or higher to produce an aqueous polyvinyl alcohol solution, mixing the aqueous polyvinyl alcohol solution with tetrahydrofurfuryl alcohol to produce a polyvinyl alcohol solution (Y), mixing the uranyl nitrate mixture (X) with the polyvinyl alcohol solution (Y) to form a mixed liquid (X) (Y), and adjusting a viscosity of said mixed liquid (X) (Y) to form a feedstock liquid which has a viscosity from 4.0×10 −2 to 6.5×10 −2 Pa·s at 15° C., wherein a total amount tetrahydrofurfuryl alcohol in said feedstock liquid is 40 to 50% by volume based on the entire volume of said feedstock liquid.