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Solvent Extraction of Selenium in Hydrochloric Acid Media by Using Triisobutyl Phosphate and Triisobutyl Phosphate/Dodecanol Mixture

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Abstract

The objective of the present study was to investigate the mechanism of selenium extraction in hydrochloric media by solvent extraction which was carried out in two steps. First, the extraction of selenium by triisobutyl phosphate (TIBP) was employed, and then in the next step, Dodecanol was used as a modifier. The effect of concentration of acid, concentration of TIBP in the organic phase, pH, temperature and modifier on the extraction of selenium(IV) was studied. The results showed that the extraction of selenium by TIBP was not favorable especially in less pH values. But there was a sharp and sudden increase in the extraction of selenium(IV) at the pH around 8–8.5 that was evaluated and proved by comparing the ORP graph of selenium extraction from hydrochloric media with Pourbaix graph of selenium in the hydrochloric media, and FTIR spectra at three points, before, after and at the peak of extraction. Thermodynamic of the process was also studied. The enthalpy of the process was calculated by the plot of log D versus 1/T × 10−4 and the value of enthalpy was estimated to be equal to −15.4 J/mol which indicated an exothermic reaction. In the next step, the extraction of selenium by TIBP in the presence of Dodecanol as a modifier was surveyed. The result represented that the extraction of selenium increased up to 99 % by using Dodecanol as a modifier at low pH values.

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Acknowledgments

The authors acknowledge the generous support of Mr. Dariush Darvishi, and the financial support of Rafsanjan Nonferrous Recycling Company especially Mr. Ali Bagheri the vice manager of company.

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Authors and Affiliations

  1. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran

    Anahita Sattari, Maryam Kavousi & Eskandar Keshavarz Alamdari

  2. Research Center for Materials and Mining Industries Technology, Amirkabir University of Technology, Tehran, Iran

    Eskandar Keshavarz Alamdari

Authors
  1. Anahita Sattari
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  2. Maryam Kavousi
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  3. Eskandar Keshavarz Alamdari
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Correspondence to Eskandar Keshavarz Alamdari.

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Sattari, A., Kavousi, M. & Alamdari, E.K. Solvent Extraction of Selenium in Hydrochloric Acid Media by Using Triisobutyl Phosphate and Triisobutyl Phosphate/Dodecanol Mixture. Trans Indian Inst Met 70, 1103–1109 (2017). https://doi.org/10.1007/s12666-016-0904-x

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  • DOI: https://doi.org/10.1007/s12666-016-0904-x

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