Evolution of chromium, manganese and iron oxidation state during conversion of nuclear waste melter feed to molten glass
Source abstract
Abstract
Abstract Oxidation state and chemical conversion of three surrogate nuclear high-level waste melter feeds heat treated to temperatures between 500 and 1200 °C were studied using X-ray near-edge structure, feed expansion tests, X-ray diffraction, and evolved gas analyses. For the high-chromium feed (3.00 mass% Cr2O3 in glass), the average Cr oxidation state was predominately Cr3+ at the lowest and highest heat-treatment temperatures and Cr6+ at intermediate temperatures while the Fe coordination shifted from octahedral to non-centrosymmetric tetrahedral at higher temperatures with Fe oxidation state unchanged. For the high-manganese-high-iron feed (3.23 mass% MnO and 16.01 mass% Fe2O3 in glass), the average Mn oxidation state decreased from 4 to ~2 while the Fe oxidation state shifted towards increasing ferrous content and changed from five-fold coordination to tetrahedral. For the high-alumina feed (24.02 mass% Al2O3 in glass), average Fe coordination did not change, but Fe oxidation state shifted towards higher ferrous content with increasing temperature.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Nuclear materials and radiation effects · Recycling and utilization of industrial and municipal waste in materials production · Nuclear Materials and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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