Uranium Retention in Silica-Rich Natural Glasses: Nuclear Waste Disposal Aspect

Abstract

Uranium-containing glass samples with an age of 140–145 million years were collected within the volcanic rocks of the largest volcanic-related uranium ore deposit in the world. Main features of their composition are high concentrations of silica and uranium, the largest for the rocks of this type. In contrast to this, the ages of fresh (unaltered) low-silica natural glasses of a basic composition (basalts) usually do not exceed a few million years. The volcanic low-silica glass is unstable at longer times and in older ancient rocks is transformed into a crystalline mass. The geochemistry of uranium including the behavior in solids and solutions is similar to that of long-lived transuranic actinides such as radioactive Np and Pu from high-level radioactive waste. This allows uranium to be used as a simulant of these long-lived hazardous radionuclides both at the synthesis and for the study of various nuclear wasteforms: glasses, glass crystalline materials and crystalline ceramics. The data obtained on long-term behavior of natural glasses are of importance for prognosis and validation of stability of nuclear wasteforms disposed of in geological disposal facilities (GDF).

Solution and solid-state characterization of rare silyluranium(iii) complexes

“…2 Naturally, uranium and silicon also intermix at high temperatures, and can be found together in the glasses of volcanic rocks proximal to uranium ore deposits. 3 Shales in Europe and Asia have also been discovered to be rich in uranium and silicon as well. 4 As such, understanding the basic bonding of these two elements is critical for future energy needs where extraction and separation are utilized.…”