Measuring method of content of rare earth elements in thorium dioxide
A rare earth element, thorium dioxide technology, applied in the establishment of a new chemical detection field, to meet the requirements of project analysis technical indicators and simple operation
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[0031] (1) Dissolution of the sample
[0032] Accurately weigh 0.2-0.8g sample into a polytetrafluoroethylene beaker, add 20-50mL concentrated nitric acid (re-distilled superior grade pure) and heat on a heating plate; add 0.05-1.0mL of 0.5% hydrofluoric acid solution after steaming , the solution was clear and evaporated to near dryness. Add 5 mL of 3 mol / L nitric acid solution, add 0.2-0.5 mL of hydrogen peroxide (20%, superior grade), steam until the solution is clear and then cool.
[0033] (2) Separation of thorium and rare earth elements
[0034] Wash the beaker three times and transfer to a 60mL quartz separatory funnel added with 20-40mL extractant (carbon tetrachloride: tributyl phosphate = 1:1), shake and stand for 3min-5min to separate and discard the organic phase. Transfer the water phase into a polytetrafluoroethylene beaker, add 1 mL of nitric acid (double-distilled superior grade) and heat it on a hot plate until nearly dry, repeat the extraction operation tw...
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