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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
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The solvent extraction and stripping process using Alamine 336 with a case study of uranium.

Fazel Zahakifar1, Fereshte Khanramaki2, Davood Ghoddocy Nejad2

  • 1Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, Iran. Fzahakifar@aeoi.org.ir.

Scientific Reports
|April 6, 2025
PubMed
Summary

This study optimized solvent extraction of uranium (VI) using Alamine 336 in kerosene, achieving 99.72% efficiency. Uranium stripping was highly effective using ammonium carbonate, demonstrating efficient uranium recovery and purification.

Keywords:
Alamine 336Leach liquorSolvent extractionStrippingSulfate mediumUranium

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Area of Science:

  • Hydrometallurgy
  • Nuclear Chemistry
  • Separation Science

Background:

  • Uranium (VI) recovery from acidic sulfate solutions is crucial for nuclear fuel reprocessing.
  • Solvent extraction is a key technology for separating and purifying uranium.
  • Alamine 336 in kerosene offers potential for efficient uranium extraction.

Purpose of the Study:

  • To comprehensively study the solvent extraction of uranium (VI) from acidic sulfate solutions using Alamine 336.
  • To investigate the influence of various parameters on uranium extraction efficiency.
  • To optimize the stripping process for uranium recovery and assess purification selectivity.

Main Methods:

  • Solvent extraction experiments were conducted using varying concentrations of sulfuric acid, Alamine 336, and uranium (VI).
  • Parameters like contact time, organic/aqueous phase ratio, and temperature were systematically varied.
  • Stripping efficiency was evaluated using different salt and acid solutions, including ammonium carbonate.

Main Results:

  • An extraction efficiency of 99.72% was achieved under optimal conditions (0.15 mol L⁻¹ H₂SO₄, 0.05 mol L⁻¹ Alamine 336, 25°C, 1:1 O/A ratio).
  • The extraction process was found to be rapid, exothermic, and spontaneous, with a Log Kex of 5.92.
  • Stripping with 0.5 mol L⁻¹ (NH₄)₂CO₃ yielded 99.87% uranium recovery in a single step, indicating high selectivity.

Conclusions:

  • Solvent extraction with Alamine 336 is a highly effective method for uranium (VI) recovery from acidic sulfate leach liquors.
  • Sulfuric acid concentration significantly impacts uranium extraction efficiency.
  • The process demonstrates excellent selectivity for uranium purification and efficient recovery of the loaded organic phase.