Copper solvent extraction: The state of the art

Kordosky, G.

doi:10.1007/bf03223049

Cited by 47 publications

(20 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To probe the influence of the Hofmeister bias on the selectivity of anion complexation, single-phase potentiometric titration experiments were employed to investigate the binding of SO 4 2À and Cl À by one of the copper only complexes, [Cu-A C H T U N G T R E N N U N G (LÀ2H)] in 95 %/5 % MeOH/water. Under these conditions selectivity was reversed (SO 4 2À > Cl À ) confirming that the Hofmeister bias, which reflects the relative hydration energies of the anions, dominates the selectivity of anion extraction from aqueous media into CHCl 3 .…”

Section: Introductionsupporting

confidence: 64%

“…The latter were employed to probe the metal and anion binding properties of these ionophores and define the relative affinities of their complexes for different anions (see below 3 and is in accordance with the expected square-planar geometry for the nickel(II) centres; this was confirmed also by single-crystal X-ray analysis (see below).…”

Section: Resultsmentioning

confidence: 95%

“…[3] Different types of hydrometallurgical flowsheets are needed for metal-recovery from sulfide ores in order to exploit a range of very efficient leaching processes that have been developed recently by the mining industry. [4] Extraction of a metal salt to achieve the unit operations of concentration and separation ( Figure 1) has been suggested as an approach that will result in better materials balances, particularly from pregnant leach solutions, which contain high concentrations of metal salts.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Anion Selectivity in Zwitterionic Amide‐Functionalised Metal Salt Extractants

Galbraith

Wang

et al. 2007

Chemistry A European J

View full text Add to dashboard Cite

Amide-functionalised salen ligands capable of extracting metal salts have been synthesised and characterised. Single-crystal X-ray structure determinations of complexes of NiSO4, [Ni(L)(SO4)], confirm that the ionophores are in a zwitterionic form with Ni(II) bound in the deprotonated salen moiety and the SO4(2-) ion associated with protonated pendant N'-amidopiperazine groups. Treatment of [Ni(L)(SO4)] with base removes the protons from the pendant amido-amine group resulting in loss of the SO4(2-) ion and formation of metal-only complexes of type [Ni(L-2H)], which have been characterized by single-crystal X-ray diffraction. Three of the ligands with solubilities suitable for solvent extraction studies show loading and stripping pH-profiles that are suitable for the recovery of CuSO4 or CuCl2 from industrial leach solutions. The copper-only complexes, [Cu(L-2H)], are selective for Cl- over SO4(2-) in both solvent extraction and bulk liquid membrane transport experiments and were found to bind Cl- in two steps via the formation of a 1:1:1 [Cu(L-H)Cl] assembly, followed by a 1:1:2 [Cu(L)Cl2] assembly as the pH of the aqueous phase is lowered. The anion transport selectivity was evaluated for a number of other mono-charged anions and interestingly the ligands were found to display a preference for the Br- ion. To probe the influence of the Hofmeister bias on the selectivity of anion complexation, single-phase potentiometric titration experiments were employed to investigate the binding of SO4(2-) and Cl- by one of the copper only complexes, [Cu(L-2H)] in 95 %/5 % MeOH/water. Under these conditions selectivity was reversed (SO4(2-)>Cl-) confirming that the Hofmeister bias, which reflects the relative hydration energies of the anions, dominates the selectivity of anion extraction from aqueous media into CHCl3.

show abstract

Section: Introductionsupporting

confidence: 64%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anion Selectivity in Zwitterionic Amide‐Functionalised Metal Salt Extractants

Galbraith

Wang

et al. 2007

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…The most common commercial application of these processes is in the copper industry (Kordosky, 1992). Although oxide ore is preferred in leaching mineralisation, many operations also leach sulphide ores as well.…”

Section: Introductionmentioning

confidence: 99%

State of the art in copper hydrometallurgic processes control

Bergh¹,

Jämsä‐Jounela²,

Hodouin³

2001

Control Engineering Practice

View full text Add to dashboard Cite

A review of the state of art and trends in automation and control of hydrometallurgic processes is presented. Besides the great expansion of hydrometallurgic processes world-wide, there are a number of unsolved problems related to lack of instrumentation, lack of process knowledge, odd operating practices, and in general, lack of use of data management and processing. In general, process control of local objectives are frequently achieved, however, application of mature and new techniques, successfully adopted in other mineral processing plants, are seldom reported. In the near future it is expected that intelligent techniques will be incorporated to solve a large variety of problems. r

show abstract

“…When mono-deprotonated, (saoH -), the ligand forms a pseudomacrocyclic ring which has the perfect cavity size to accommodate a Cu II ion [18][19][20]. This has led *Address correspondence to this author at the EaStCHEM School of Chemistry, The University of Edinburgh, The Kings Buildings, West Mains Road, Edinburgh, EH9 3JJ, UK; Tel: +44 (0)131-650-7545; E-mails: ebrechin@staffmail.ed.ac.uk, Peter.Tasker@ed.ac.uk to extensive research within extractive hydrometallurgy as it is extremely selective over other metal ions, and is now responsible for extracting approximately 25% of the world's copper [21,22]. Our interest also lies partly in its role as an anti-corrosive in protective coatings when treating lightly oxidised Fe surfaces, where it has been postulated that the protection occurs via polynuclear cluster formation on the surface [23].…”

Section: Introductionmentioning

confidence: 99%