Gold Recovery from Nickel Catalyzed Ammonium Thiosulfate Solution by Strongly Basic Anion Exchange Resin

Arima, Harunobu; Fujita, Toyohisa; Yen, W.T.

doi:10.2320/matertrans.44.2099

Cited by 26 publications

(9 citation statements)

References 31 publications

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“…The commercial AC adsorbent supplied by Merck was also previously characterized. 23 The anions used for the potentiometric and the adsorption measurements were obtained as high purity . Ligand protonation constants used in calculations were previously determined, 11,14 while anion protonation constants were taken from the literature.…”

Section: Methodsmentioning

confidence: 99%

Binding and removal of octahedral, tetrahedral, square planar and linear anions in water by means of activated carbon functionalized with a pyrimidine-based anion receptor

et al. 2014

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Binding of S 2 O 3 2À , SeO 4 2À , Pt(CN) 4 2À , Co(CN) 6 3À , Au(S 2 O 3 ) 2 3À and Fe(CN) 6 4À anions by the protonated (positively charged) forms of tren (tris(2-aminoethyl)amine) and of the tren-derivative (HL) containing a pyrimidine residue was studied by means of potentiometric measurements in 0.1 M NMe 4 Cl solutions at 298.1 AE 0.1 K. Both ligands form stable complexes with these anions which appear to be mostly stabilized by electrostatic forces. In the case of HL, an anion-p interaction with the pyrimidine residue of the ligand also affords a significant contribution to complex stability. Some shape preference for tetrahedral and octahedral anions over square planar ones is observed. A hybrid AC/HL material obtained by adsorption of HL on commercial activated carbon (AC) was used to study the extraction of these anions from water. AC/HL shows enhanced adsorption capacity toward all the anions studied with respect to AC. This behavior is ascribed to the stronger interaction of anions with the HL function of AC/ HL than with the Cp-H 3 O + sites of unfunctionalized AC. Of special interest is the enhancement of the adsorption capacities found for Au(S 2 O 3 ) 2 3À and Pt(CN) 4 2À, two anions of great relevance for the extraction of platinum and gold from ores and from metallic wastes.

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Section: Methodsmentioning

confidence: 99%

Binding and removal of octahedral, tetrahedral, square planar and linear anions in water by means of activated carbon functionalized with a pyrimidine-based anion receptor

et al. 2014

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“…Ninety-five percent of gold in a silicate-type ore was extracted by nickel-ammonia-catalyzed thiosulfate leaching, and thiosulfate consumption was only 1.2 kg/t-ore [44]. The dissolved gold in nickel-ammonia-catalyzed ammonium thiosulfate solution can be efficiently recovered by a strongly basic anion exchange resin, and the percentages of gold adsorption and elution are both over 99% because of the lack of interference of [Cu(S 2 O 3 ) 3 ] 5− [64]. The extractions of gold and silver from a complex polymetallic sulfide concentrate by copper-and nickel-catalyzed ammoniacal thiosulfate leaching were comparatively studied in our previous work [14].…”

Section: The Replacement Of Traditional Cupric-ammonia Catalysismentioning

confidence: 99%

A Review of Thiosulfate Leaching of Gold: Focus on Thiosulfate Consumption and Gold Recovery from Pregnant Solution

Kong

et al. 2017

Metals

135

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Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold. In this review, the four solutions to reduce the consumption of thiosulfate, including the control of reaction conditions, the use of additives, the generation of thiosulfate in situ, and the replacement of traditional cupric-ammonia catalysis, are introduced and evaluated after the presentation of background knowledge about thiosulfate consumption. The replacement of cupric-ammonia catalysis with other metals, such as nickel-and cobalt-based catalysts, is proposed. The reason is that it not only reduces thiosulfate consumption observably via decreasing the redox potential of leach solution significantly but also is beneficial to gold recovery mainly owing to eliminating the interference of cuprous thiosulfate [Cu(S 2 O 3 ) 3 ] 5− . Based on the comparative analysis for five common recovery techniques of rare-noble metals from pregnant leach solution, ion-exchange resin adsorption is considered to be the most appropriate to recover aurothiosulfate [Au(S 2 O 3 ) 2 ] 3− because the resin can be employed in the form of resin-in-leach/pulp and, furthermore, is able to be eluted and regenerated simultaneously at ambient temperature. At last, how to reduce the process cost of the resin adsorption technique is discussed. In order to simplify the complex two-stage elution process for loaded resins, the traditional catalysis is suggested to be replaced.

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“…In a recent study on the gold elution from the same resin with different gold loading capacities, perchlorate has been found to be an effective eluent (Equation 11) [81]. For 2.0 g resin with 5 kg/t gold loading capacity, nearly 100% gold can be successfully eluted by 2.5 mol/L perchlorate and an eluate with average gold concentration of 300 mg/L was produced.…”

Section: (|−Nrmentioning

confidence: 99%

“…As a result of this, the simultaneous loading of a considerable amount of copper with gold on the resins has become one of the primary factors affecting the gold recovery from pregnant thiosulfate solutions. In order to solve the competitive adsorption problem of copper with gold on the resins, the replacement of traditional cupric-ammonia catalysis has been proposed [81]. Dowex 21K resin was adopted to recover gold from pregnant thiosulfate solutions with nickel catalysis.…”

Section: The Adsorption Of Gold On the Strong-base Resinsmentioning

confidence: 99%

Recovery of Gold from Pregnant Thiosulfate Solutions by the Resin Adsorption Technique

Dong

Jiang

et al. 2017

Metals

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This review is devoted to an integrated evaluation of the current use and future development of the resin adsorption technique in gold recovery from pregnant thiosulfate solutions.Comparisons are firstly made with other recovery techniques, including precipitation, activated carbon adsorption, solvent extraction, electrowinning and mesoporous silica adsorption. A detailed discussion about the recent advances of the technique in gold recovery from pregnant thiosulfate solutions is then presented from the aspects of gold adsorption on the resins and gold-loaded resin elution, respectively. On the basis of summarizing the present research, the major limitations of the resin adsorption technique are eventually pointed out and future development will also be prospected.

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Gold Recovery from Nickel Catalyzed Ammonium Thiosulfate Solution by Strongly Basic Anion Exchange Resin

Cited by 26 publications

References 31 publications

Binding and removal of octahedral, tetrahedral, square planar and linear anions in water by means of activated carbon functionalized with a pyrimidine-based anion receptor

Binding and removal of octahedral, tetrahedral, square planar and linear anions in water by means of activated carbon functionalized with a pyrimidine-based anion receptor

A Review of Thiosulfate Leaching of Gold: Focus on Thiosulfate Consumption and Gold Recovery from Pregnant Solution

Recovery of Gold from Pregnant Thiosulfate Solutions by the Resin Adsorption Technique

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