The optimal use of tris-2-ethylhexylamine to recover hydrochloric acid and metals from leach solutions and comparison with other extractants

Uchenna Kesieme; Andreas Chrysanthou; Maurizio Catulli; Chu Yong Cheng

doi:10.1016/j.jece.2018.05.001

The optimal use of tris-2-ethylhexylamine to recover hydrochloric acid and metals from leach solutions and comparison with other extractants

Uchenna Kesieme, Andreas Chrysanthou, Maurizio Catulli, Chu Yong Cheng

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Abstract

This paper describes the use of TEHA for HCl recovery from a leach solution generated by a hydrometallurgical plant. Four organic extractants were tested including TEHA, Alamine 336, Cyanex 923 and TBP. TEHA
organic system performed best in terms of acid extraction, stripping and scrubbing efficiency. The successive extraction shows that more than 99% HCl was extracted after three stages of extraction. Scrubbing tests with
different A/O ratios at different temperatures were conducted to identify the optimal conditions to separate HCl, Mn and Fe. After scrubbing the loaded organic solution at an A/O ratio of 1:4 and 22 °C, 94–100% of entrained
metals were removed in a single contact with only 5.2% acid lost in the loaded scrub liquor. It was found that the phase disengagement time was in the range of 2– 4 min for both extraction and stripping, indicating
reasonable fast phase separation. Based on these results from batch tests, it can be expected that after optimisation in a counter current circuit consisting of extraction, scrubbing, selective and bulk stripping, nearly all
metals and HCl would be recovered and recycled.

Original language	English
Pages (from-to)	3177-3184
Number of pages	8
Journal	Journal of Environmental Chemical Engineering
Volume	6
Issue number	2
DOIs	https://doi.org/10.1016/j.jece.2018.05.001
Publication status	Published - 1 May 2018

Keywords

HCl recovery
Solvent extraction
TEHA

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10.1016/j.jece.2018.05.001

Kesieme et al acid recovery accepted manuscritpAccepted author manuscript, 949 KBLicence: CC BY-NC-ND

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title = "The optimal use of tris-2-ethylhexylamine to recover hydrochloric acid and metals from leach solutions and comparison with other extractants",

abstract = "This paper describes the use of TEHA for HCl recovery from a leach solution generated by a hydrometallurgical plant. Four organic extractants were tested including TEHA, Alamine 336, Cyanex 923 and TBP. TEHAorganic system performed best in terms of acid extraction, stripping and scrubbing efficiency. The successive extraction shows that more than 99% HCl was extracted after three stages of extraction. Scrubbing tests withdifferent A/O ratios at different temperatures were conducted to identify the optimal conditions to separate HCl, Mn and Fe. After scrubbing the loaded organic solution at an A/O ratio of 1:4 and 22 °C, 94–100% of entrainedmetals were removed in a single contact with only 5.2% acid lost in the loaded scrub liquor. It was found that the phase disengagement time was in the range of 2– 4 min for both extraction and stripping, indicatingreasonable fast phase separation. Based on these results from batch tests, it can be expected that after optimisation in a counter current circuit consisting of extraction, scrubbing, selective and bulk stripping, nearly allmetals and HCl would be recovered and recycled.",

keywords = "HCl recovery, Solvent extraction, TEHA",

author = "Uchenna Kesieme and Andreas Chrysanthou and Maurizio Catulli and Cheng, {Chu Yong}",

note = "This document is the Accepted Manuscript version of the following article: Uchenna Kesieme, Andreas Chrysanthou, Maurizio Catulli, and Chu Yong Cheng, {\textquoteleft}The optimal use of tris-2-ethylhexylamine to recover hydrochloric acid and metals from leach solutions and comparison with other extractants{\textquoteright}, Journal of Environmental Chemical Engineering, Vol. 6 (2): 3177-3184, April 2018. Under embargo until 1 May 2019. The final, definitive version is available online via: https://doi.org/10.1016/j.jece.2018.05.001 ",

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AU - Kesieme, Uchenna

AU - Chrysanthou, Andreas

AU - Catulli, Maurizio

AU - Cheng, Chu Yong

N1 - This document is the Accepted Manuscript version of the following article: Uchenna Kesieme, Andreas Chrysanthou, Maurizio Catulli, and Chu Yong Cheng, ‘The optimal use of tris-2-ethylhexylamine to recover hydrochloric acid and metals from leach solutions and comparison with other extractants’, Journal of Environmental Chemical Engineering, Vol. 6 (2): 3177-3184, April 2018. Under embargo until 1 May 2019. The final, definitive version is available online via: https://doi.org/10.1016/j.jece.2018.05.001

PY - 2018/5/1

Y1 - 2018/5/1

N2 - This paper describes the use of TEHA for HCl recovery from a leach solution generated by a hydrometallurgical plant. Four organic extractants were tested including TEHA, Alamine 336, Cyanex 923 and TBP. TEHAorganic system performed best in terms of acid extraction, stripping and scrubbing efficiency. The successive extraction shows that more than 99% HCl was extracted after three stages of extraction. Scrubbing tests withdifferent A/O ratios at different temperatures were conducted to identify the optimal conditions to separate HCl, Mn and Fe. After scrubbing the loaded organic solution at an A/O ratio of 1:4 and 22 °C, 94–100% of entrainedmetals were removed in a single contact with only 5.2% acid lost in the loaded scrub liquor. It was found that the phase disengagement time was in the range of 2– 4 min for both extraction and stripping, indicatingreasonable fast phase separation. Based on these results from batch tests, it can be expected that after optimisation in a counter current circuit consisting of extraction, scrubbing, selective and bulk stripping, nearly allmetals and HCl would be recovered and recycled.

AB - This paper describes the use of TEHA for HCl recovery from a leach solution generated by a hydrometallurgical plant. Four organic extractants were tested including TEHA, Alamine 336, Cyanex 923 and TBP. TEHAorganic system performed best in terms of acid extraction, stripping and scrubbing efficiency. The successive extraction shows that more than 99% HCl was extracted after three stages of extraction. Scrubbing tests withdifferent A/O ratios at different temperatures were conducted to identify the optimal conditions to separate HCl, Mn and Fe. After scrubbing the loaded organic solution at an A/O ratio of 1:4 and 22 °C, 94–100% of entrainedmetals were removed in a single contact with only 5.2% acid lost in the loaded scrub liquor. It was found that the phase disengagement time was in the range of 2– 4 min for both extraction and stripping, indicatingreasonable fast phase separation. Based on these results from batch tests, it can be expected that after optimisation in a counter current circuit consisting of extraction, scrubbing, selective and bulk stripping, nearly allmetals and HCl would be recovered and recycled.

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The optimal use of tris-2-ethylhexylamine to recover hydrochloric acid and metals from leach solutions and comparison with other extractants

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