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Extraction of cadmium from phosphoric acid solutions with amines Part II. Diluent selection, flow-sheet configuration, pilot plant operation

Stenström, Stig LU and Aly, Gharib LU (1985) In Hydrometallurgy 14(2). p.257-276
Abstract
A large number of diluents were screened to determine the optimum combination between diluent and extractant. Combinations of a C8 tertiary amine and aromatic diluents or of a C12 tertiary amine and aliphatic diluents do not lead to third-phase formation.



A flow-sheet for a solvent-extraction process for treatment of various qualities of wet-process phosphoric acid solutions is proposed. Based on a cadmium purification level of 1 mg/kg, extraction, stripping and scrubbing sections of the process would contain two, two and one stages, respectively. A solvent pre-treatment stage may be necessary in some cases.



Co-extraction of acids such as H3PO4, H2SO4, HCI, HF and H2SiF6 can be decreased to very low... (More)
A large number of diluents were screened to determine the optimum combination between diluent and extractant. Combinations of a C8 tertiary amine and aromatic diluents or of a C12 tertiary amine and aliphatic diluents do not lead to third-phase formation.



A flow-sheet for a solvent-extraction process for treatment of various qualities of wet-process phosphoric acid solutions is proposed. Based on a cadmium purification level of 1 mg/kg, extraction, stripping and scrubbing sections of the process would contain two, two and one stages, respectively. A solvent pre-treatment stage may be necessary in some cases.



Co-extraction of acids such as H3PO4, H2SO4, HCI, HF and H2SiF6 can be decreased to very low values by manipulating process variables such as pre-equilibration, phase ratios, diluent and amine concentration. Co-extraction of cations other than cadmium was also investigated. Iron, aluminium and magnesium are not co-extracted while zinc and calcium are co-extracted to some extent.



The proposed process can be used either for pollution abatement or in combination with other purification processes to recover some of the valuable cations such as uranium, or to produce more refined phosphoric acid streams. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Hydrometallurgy
volume
14
issue
2
pages
257 - 276
publisher
Elsevier
external identifiers
  • wos:A1985AMB5100007
  • scopus:0022094161
ISSN
0304-386X
DOI
10.1016/0304-386X(85)90036-2
language
English
LU publication?
yes
id
00509958-ccb7-44e6-9630-4a8e4519709e (old id 3914163)
date added to LUP
2013-07-01 10:22:01
date last changed
2017-01-01 04:46:21
@article{00509958-ccb7-44e6-9630-4a8e4519709e,
  abstract     = {A large number of diluents were screened to determine the optimum combination between diluent and extractant. Combinations of a C8 tertiary amine and aromatic diluents or of a C12 tertiary amine and aliphatic diluents do not lead to third-phase formation.<br/><br>
<br/><br>
A flow-sheet for a solvent-extraction process for treatment of various qualities of wet-process phosphoric acid solutions is proposed. Based on a cadmium purification level of 1 mg/kg, extraction, stripping and scrubbing sections of the process would contain two, two and one stages, respectively. A solvent pre-treatment stage may be necessary in some cases.<br/><br>
<br/><br>
Co-extraction of acids such as H3PO4, H2SO4, HCI, HF and H2SiF6 can be decreased to very low values by manipulating process variables such as pre-equilibration, phase ratios, diluent and amine concentration. Co-extraction of cations other than cadmium was also investigated. Iron, aluminium and magnesium are not co-extracted while zinc and calcium are co-extracted to some extent.<br/><br>
<br/><br>
The proposed process can be used either for pollution abatement or in combination with other purification processes to recover some of the valuable cations such as uranium, or to produce more refined phosphoric acid streams.},
  author       = {Stenström, Stig and Aly, Gharib},
  issn         = {0304-386X},
  language     = {eng},
  number       = {2},
  pages        = {257--276},
  publisher    = {Elsevier},
  series       = {Hydrometallurgy},
  title        = {Extraction of cadmium from phosphoric acid solutions with amines Part II. Diluent selection, flow-sheet configuration, pilot plant operation},
  url          = {http://dx.doi.org/10.1016/0304-386X(85)90036-2},
  volume       = {14},
  year         = {1985},
}