Complete separation of aluminium from rare earths using two-stage solvent extraction

Wang, Yabing; Wang, Yanliang; Su, Xiang; Zhou, Haiyue; Sun, Xiaoqi

doi:10.1016/j.hydromet.2018.06.004

Cited by 30 publications

(14 citation statements)

References 13 publications

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“…• modification of the chemical state of the impurities before leaching (e.g., selective roasting [14], carbothermic reduction of iron [15], magnetizing roasting of iron [16], reduction of Fe 3+ to Fe 2+ and subsequent solvent extraction with primary amines [17]), • REE removal from the leach liquor (e.g., sulfate/double sulfate precipitation [7,18,19], oxalate precipitation [7,9], ammonium bicarbonate precipitation [20], solvent extraction [21]), • impurity removal from the leach liquor (hydrolysis-precipitation [22], solvent extraction [23,24]).…”

Section: Introductionmentioning

confidence: 99%

Separation of Aluminum and Iron from Lanthanum—A Comparative Study of Solvent Extraction and Hydrolysis-Precipitation

et al. 2020

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This study investigates the removal of aluminum and iron from rare earth element (REE) containing solutions by solvent extraction with saponified naphthenic acid and by hydrolysis-precipitation. The results emphasize both, the preferential application as well as limitations of every method. We find that emulsification occurring during the solvent extraction of aluminum is caused by its slow extraction rate in comparison to the neutralization reaction and by the proximity of the pH value required for aluminum extraction and the pH value at which hydrolysis of aluminum occurs. However, by choosing a long shaking time of at least 4 h, the emulsion recedes. The formation of emulsion can be avoided by strict control of pH value during the extraction. Moreover, the loading capacity of the organic phase with aluminum is limited due to the strong increase in viscosity of the organic phase with increasing aluminum concentration and due to the gel formation. Regarding the extraction of iron, the amount of extracted ions is limited due to the overlap of the pH range required for the extraction with pH range in which sparingly soluble iron oxides/hydroxides are formed. In summary, aluminum and iron can be simultaneously removed from REE-sulfate solution by solvent extraction with saponified naphthenic acid in one extraction stage only from diluted solutions. However, in comparison to the hydrolysis-precipitation method, a higher purity of the solution is achieved. A complete removal of aluminum and iron from concentrated solutions can be achieved in two stages. First, the content of aluminum and iron should be reduced by hydrolysis-precipitation. After that, a high-purity solution can be obtained by subsequent solvent extraction by saponified naphthenic acid.

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Section: Introductionmentioning

confidence: 99%

Separation of Aluminum and Iron from Lanthanum—A Comparative Study of Solvent Extraction and Hydrolysis-Precipitation

et al. 2020

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“…Earlier studies done by Preston (1985) focusing on the application of carboxylic acids on di-and tri-valence metals reported that Versatic 10 found to be an effective extractant for this purpose. Most recent studies by Wang et al (2018) and Yang and Qiu (2017) are found that saponified naphthenic acid (NA) successfully separated the aluminium from REEs. Detailed literature reviews of these works are described in Section 2.4.…”

Section: Carboxylic Acids As Extractantsmentioning

confidence: 99%

“…A series of recent studies conducted on separating Al from rare earth elements (REE) using saponified naphthenic acid. Wang et al (2018) and Yang and Qiu (2017) naphthenic acid -synthesized) was used in the second stage. Both authors suggested that in order to reach the optimum extraction results, maintaining the initial solution at pH = 3 is necessary, which supported the findings of the effective Al extraction range of Ritcey (2006a).…”

Section: Overview Of Aluminium Extractionmentioning

confidence: 99%

“…However, the described process was somewhat problematic as constant gypsum precipitation occurred in the circuit which need to be removed immediately. Some studing including (Mohapatra et al, 2007, Wang et al, 2018, Yang and Qiu, 2017 are used 50% neutralized Na salt of either DEHPA, Cyanex 272, OPIPA or Naphthalic Acid successfully. One advantage of this approach is the exchange between Na + ion and Al 3+ will not affect the overall solution pH.…”

Section: Alternative Neutralization Optionsmentioning

confidence: 99%

“…In the latter study, the author observed extremely long -10 minutes of equilibrium time required to fully strip the loaded organic. Wang et al (2018) studied various stripping agents to separate Al 3+ from REE loaded S-OPIPA and S-NA. In this process, preferred stripping agent was NaOH solution followed by HNO3 solution.…”

Section: Stripping Testmentioning

confidence: 99%

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UQ eSpace

Darinchuluun¹

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I would like to acknowledge a number of people who have greatly contributed to the completion of this thesis. First and foremost, I would like to express my deepest gratitude to my supervisor, Associate Professor, Dr James Vaughan who suggested and formulated the thesis topic and directed the research; without your help I would not be able to complete this work. I truly appreciate your patient supervision, enthusiastic encouragement, many crucial advises and guidance. Your door was always open whenever I have trouble or question about my research. My deepest appreciation goes out to Mr. James Gudgeon and UQ Hydrometallurgy Research Laboratory team who provided much needed help and technical input. The team always helped me by all necessary reagents, equipment and instruments in supply and James was always available and made the laboratory available throughout the course of the project. My entire study is fully funded by Australia Awards Scholarship which I am most grateful for the opportunity. Furthermore, I gratefully acknowledge Regional Coordinator Ms. Holly Roberts for her invaluable guidance and administrative assistance throughout my entire study program. Thank you, Holly, for always been there for me; this project would not have been possible without your support. I would also thank Dr Weng Fu and Dr Hong Peng for their professional insight and technical advice on the project. Finally, I would like to thank my husband Bat-Erdene Jargalsaikhan and my daughter Nomunbileg Bat-Erdene, who are being incredibly supportive and patient over these years. I have a strength to finish this project because you are always by my side.

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Thermodynamics of the Selective Separation of La(III) and Y(III) from Nitrate Medium by D2EHPA in the Presence of Al(III) and Ca(II) Impurities

Alizadeh

Abdollahy

Darban

et al. 2021

Mining, Metallurgy & Exploration

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Complete separation of aluminium from rare earths using two-stage solvent extraction

Cited by 30 publications

References 13 publications

Separation of Aluminum and Iron from Lanthanum—A Comparative Study of Solvent Extraction and Hydrolysis-Precipitation

Separation of Aluminum and Iron from Lanthanum—A Comparative Study of Solvent Extraction and Hydrolysis-Precipitation

UQ eSpace

Thermodynamics of the Selective Separation of La(III) and Y(III) from Nitrate Medium by D2EHPA in the Presence of Al(III) and Ca(II) Impurities

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