Ruthenium is one of a number of elements which complicate the regeneration of processed nuclear fuel from atomic power stations. Its properties are such that it accompanies valuable elements, in particular, uranium, in the extraction technology and thereby makes it difficult to carry out the necessary purification or uranium from radioactivity when refabricating fuel elements. It is therefore an urgent problem to investigate the extraction chemistry of ruthenium. This problem is difficult due to the complexity of the chemistry of ruthenium and the number of forms in which it is present. In solutions in nitric acid it is mainly in the form of different kinds of nitrosoruthenium RuNO(NO3) 3_i(OH)i(H20)n, where i = 0, 1 and 2, which are capable of changing into one another. The kinetics of the transition has not been investigated in sufficient detail. However, we know that the half-transition time at room temperature is 20-30 rain. We also know that the most strongly extracted form is nitrosoruthenium trinitrate RuNO(NO3) 3 (abbreviated RUT). The solvate number q for ruthenium when extracting the tributylphosphate (TBP) has not been reliably established. Thus, according to the data in [1] q = 2 (which corresponds to stereochemical representations: ruthenium has six coordination sites, one occupies the NO group, three occupy the nitrate groups and two occupy the tributylphosphate). However, according to the data [2] q = 4. (1) and 2.5 (2): o is the salt aqueous phase. 9 is the aqueous phase, 1 M HNO 3, ignoring the bonding of TBP with the acid, and A is the same taking into account the bonding of the TBF with nitric acid.

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