Other Fuel Forms 
Uranium alloyed. The enriched uranium is combined with 
an alloying material like aluminum. The dissolution of this fuel 
element for processing results in a solution containing a high 
concentration of aluminum nitrate instead of nitric acid. 
Aqueous uranium solution. The uranium can be in a water 
solution in the form of uranyl sulfate or uranyl nitrate. The same 
solvent extraction processes will be required to separate the uranium 
from the fission products and presumably acid wastes like those from 
the heterogeneous reactor would result. 
Uranium in metal solution. The uranium fuel can be dissolved 
in liquid bismuth metal. The bismuth will serve to carry the uranium 
in solution in a homogeneous form and also to take heat away from the 
reactor; it is a good heat exchanger. The fission products will then 
be in a metallic state (with zero charge) and can be removed by the 
addition of a fused salt instead of by many solvent extractions. 
Further concentration of the fission products from the fused salt 
may be sossible by an electrolytic procedure. 
Condensing Fission Products in Montmorillonite Clay. 
Natural montmorillonite clay has an ion exchange capacity of 
about one milliequivalent per gram. (The clay weighs about 100 lbs. 
per cubic foot.) The concentration (of fission products) attained on 
clay depends upon the chemical solution the wastes are contained in. 
Waste solutions containing H ions or Al ions are not favorable because 
these ions usually outnumber the fission products and will use up the 
agge 
