PROCESS FOR PREPARING A POWDER COMPRISING A SOLID SOLUTION OF URANIUM DIOXIDE AND OF A DIOXIDE OF AT LEAST ONE OTHER ACTINIDE AND/OR LANTHANIDE ELEMENT Russian patent published in 2018 - IPC C01G43/00 C01G56/00 G21C3/62 

FIELD: chemistry.

SUBSTANCE: invention relates to a process for preparing a powder comprising a solid solution of uranium dioxide and a dioxide of at least one other actinide and/or lanthanide which is suitable for use in the manufacture of nuclear fuel. Method includes the step of burning a solution comprising uranyl nitrate, at least one nitrate of another actinide and/or lanthanide, and a nitrogen containing fuel, which is glycine, to obtain a solid solution, fuel being used in a predetermined super stoichiometric amount with respect to uranyl nitrate as a result of the following operations: a) operation for determining a combustion equation for uranyl nitrate, in which a stoichiometric nitrogen fuel ratio is assigned a factor ϕ_U; b) operation for determining the superstoichiometric amount of a nitrogen-containing fuel (the so-called Q_U) by multiplying the known amount of uranyl nitrate by the stoichiometric coefficient of nitrogen-containing fuel and by the factor ϕ_U, wherein the factor is greater than 1, preferably 1.5 to 1.7; c) operation for determining the combustion equation for nitrate of another actinide and/or lanthanide, in which the stoichiometric nitrogen fuel ratio is assigned a factor ϕ_An/Ln; d) determination of the amount of nitrogen-containing fuel (the so-called Q_An/Ln) by multiplying the known amount of nitrate of another element by the stoichiometric coefficient of nitrogen-containing fuel and by the factor ϕ_An/Ln, where the factor is less than 2; and e) addition of at least the amounts of nitrogen-containing fuel defined in operations b) and d) (namely, Q_U and Q_An/Ln).

EFFECT: invention provides for the efficient production of mixed oxides in a single step.

9 cl, 3 dwg, 3 ex