An investigation of the leaching of Pt and Pd from cooperite, sperrylite and column bioleached concentrates in thiocyanate-cyanide systems

Shaik, Kathija; Petersen, Jochen

doi:10.1016/j.hydromet.2017.08.021

Cited by 17 publications

(10 citation statements)

References 20 publications

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“…Therefore, these complexes exhibit high performance in detecting different types of molecules and ions in vapor or liquid phases such as oxygen, pH, carbon dioxide, ammonia, specific metal ions and anions, toxic molecules and biomolecules 24 . In the case of cyanide, Pt exhibits high affinity to this anion and forms a stable Pt-CN complex 25 . The logarithm of the stability constant for this complex is equal to 40, being higher than that coordinated by copper, nickel, zinc or cobalt 25 .…”

Section: Introductionmentioning

confidence: 99%

“…In the case of cyanide, Pt exhibits high affinity to this anion and forms a stable Pt-CN complex 25 . The logarithm of the stability constant for this complex is equal to 40, being higher than that coordinated by copper, nickel, zinc or cobalt 25 . Therefore, it appears that sensor-based Pt complexes have high potential to determine cyanide ions at low concentrations in blood samples and without any interference.…”

Section: Introductionmentioning

confidence: 99%

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Origami paper analytical assay based on metal complex sensor for rapid determination of blood cyanide concentration in fire survivors

Sheini¹,

Aseman

Bordbar

2021

Sci Rep

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Cyanide-based blood poisoning can seriously damage fire victims and cause death if not detected quickly. Previous conventional methods require laboratory equipment, which are expensive and increase the duration of the analysis. Here, a simple origami based microfluidic device was introduced for point of need detection of blood cyanide concentration in people involved in fire. The device is made of four layers of paper. Each layer was in the size of 1 × 1 cm folded on each other. In this work, the blood sample was acidified by trichloroacetic acid to separate cyanide from methaemoglobin in the form of HCN gas. The produced gas released into borate buffer to recover free cyanide ions which interacted with the Pt complex ([Pt(p-MeC6H4)2(phen)]) used as a receptor in this study. Optimized conditions were applied to have a suitable interaction causing the color of the receptor to change from yellow to colorless. The color changes were recorded by a smartphone, and the sensor response was calculated by the routine image analysis software. The assay was capable of determining cyanide ions at different concentrations in the range of 1.0 to 100.0 µmol L−1. The detection limit of these determination was equal to 0.4 µmol L−1. The assay responses were not affected by the interfering species. As a practical analysis, the proposed sensor was applied to determine cyanide ions in the blood sample of 20 studied fire survivors and 10 controls with high accuracy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Origami paper analytical assay based on metal complex sensor for rapid determination of blood cyanide concentration in fire survivors

Sheini¹,

Aseman

Bordbar

2021

Sci Rep

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“…Anode slimes are generally treated by systems such as cyanide [6], halide [7], and biotechnologies [8]. The noble metal ions in the leaching solution are separated by precipitation [9], activated carbon adsorption [10,11], ion exchange [12,13], and solvent extraction [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A Process for the Separation of Noble Metals from HCl Liquor Containing Gold(III), Palladium(II), Platinum(IV), Rhodium(III), and Iridium(IV) by Solvent Extraction

Xing

Lee

2019

Processes

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The demand for noble metals is increasing, owing to their excellent chemical and physical properties. In order to meet the demand, the recovery of noble metals with high purity from diverse secondary resources, which contain small amounts of noble metals, is of immense value. In this work, the possibility of the separation of Au(III), Pd(II), Pt(IV), Rh(III), and Ir(IV) by solvent extraction from a synthetic HCl solution is investigated. Only Au(III) was selectively extracted by Cyanex 272 in the HCl concentration range from 0.5 M to 9 M, leaving the other metal ions in the raffinate. The loaded Au(III) in Cyanex 272 was efficiently stripped by (NH2)2CS. The other four noble metals were sequentially separated on the basis of the procedures reported in the previous work. The mass balance showed that about 98% of each metal, except Pt(IV), was recovered by the proposed process. An efficient process for the recovery of the five noble metal ions from the HCl leaching solution of secondary resources containing these metals can be developed.

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“…Cyanidation of low-grade PGM flotation concentrates was also considered as a potential route for recovery of PGMs from low-grade ores (Mwase, Petersen, and Eksteen, 2012), but such ores require preleaching of base metals (Cu and Ni) to avoid high lixiviant consumption. However, the limited base metal recoveries by the alkaline hydrometallurgical techniques investigated so far and the refractoriness of platinum minerals such as sperrylite (PtAs 2 ) have hampered the development of commercial cyanide processes for the recovery of PGMs from low-grade and oxidized ores (Mwase, Petersen, and Eksteen, 2012;Shaik and Petersen, 2017;Mwase and Petersen, 2017). The other alternative maybe be the preleaching of base metals with sulphuric acid to upgrade the low-grade concentrates.…”

Section: Introductionmentioning

confidence: 99%

PGM extraction from oxidized ores using flotation and leaching

Sefako¹,

Sibanda²,

Sekgarametso³

2019

J. S. Afr. Inst. Min. Metall.

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Flotation and leaching were investigated as possible processing routes for improving PGM recovery from a Southern African oxidized PGM ore. Different flotation reagent schemes and lixiviants were evaluated and their PGMs extraction response measured. Characterization of the PGM ore used in this study indicated that it was enriched in oxide minerals as a result of weathering and therefore oxidic. The maximum PGM flotation recovery achieved using sulphide co-collector schemes was 55.1% 3E (Pt, Pd, and Au). Application of the hydroxamate oxide collector improved the flotation recovery to 74.7% 3E. The superior PGM recoveries achieved with hydroxamates probably lies in their ability to form complexes with base metals such as iron. Direct leaching of oxidic PGM ore using different acids yielded relatively low PGM extractions. Leaching in hydrochloric acid achieved extractions of 36.6% Pt and 8.8% Pd, nitric acid achieved extractions of 34.5% Pt and 7.1% Pd. The best leaching results were obtained using aqua regia, with extractions of 48% Pt and 24.5% Pd. In view of the low PGM extractions obtained by leaching ROM ore, it was considered more promising to leach the concentrate as a way of further upgrading it. The flotation concentrate with the highest PGM recovery was leached using sulphuric acid in order to remove the base metals and further enrich it in PGMs. Extractions of 73.3% Cu, 82.9% Ni, and 8.1% Fe were achieved.

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An investigation of the leaching of Pt and Pd from cooperite, sperrylite and column bioleached concentrates in thiocyanate-cyanide systems

Cited by 17 publications

References 20 publications

Origami paper analytical assay based on metal complex sensor for rapid determination of blood cyanide concentration in fire survivors

Origami paper analytical assay based on metal complex sensor for rapid determination of blood cyanide concentration in fire survivors

A Process for the Separation of Noble Metals from HCl Liquor Containing Gold(III), Palladium(II), Platinum(IV), Rhodium(III), and Iridium(IV) by Solvent Extraction

PGM extraction from oxidized ores using flotation and leaching

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