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Abstract <p>The reaction of nitric acid with formic acid, including that in uranium-containing solutions, was studied. Empirical equations for the dependence of the induction period (τ) on the reactant concentrations and temperature were determined. The dependence of τ on the formic acid concentration is exponential. The effect of uranium concentration on τ in denitrated solutions becomes noticeable only at temperatures lower than 60°C. The main factor affecting the denitration completeness is the [formic acid] : [NO<sub>3</sub>]¯ molar ratio. Starting from the molar ratio of ≥3, uranium-containing solutions are denitrated at 90°C in an hour almost quantitatively. The resulting uranyl formate is partially precipitated. The initial stage of the reaction is accompanied by vigorous gas evolution. At 90°C, ~80% of the gas volume is released in this stage (about 10 s), whereas at 40°C, only ~10%.</p>

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Reaction of Nitrate Ion with Formic Acid in the Presence of Uranium

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • L. V. Krasnikov,
  • A. A. Lumpov,
  • N. A. Semenova

摘要

Abstract

The reaction of nitric acid with formic acid, including that in uranium-containing solutions, was studied. Empirical equations for the dependence of the induction period (τ) on the reactant concentrations and temperature were determined. The dependence of τ on the formic acid concentration is exponential. The effect of uranium concentration on τ in denitrated solutions becomes noticeable only at temperatures lower than 60°C. The main factor affecting the denitration completeness is the [formic acid] : [NO3]¯ molar ratio. Starting from the molar ratio of ≥3, uranium-containing solutions are denitrated at 90°C in an hour almost quantitatively. The resulting uranyl formate is partially precipitated. The initial stage of the reaction is accompanied by vigorous gas evolution. At 90°C, ~80% of the gas volume is released in this stage (about 10 s), whereas at 40°C, only ~10%.