The Autocatalytic Deposition of Gold in Nonalkaline, Gold Thiosulfate Electroless Bath

Sullivan, Anne; Kohl, Paul A.

doi:10.1149/1.2044282

Cited by 53 publications

(43 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Electrowinning is also an option for gold recovery, and [Au(S 2 O 3 ) 2 ] 3− anions in the pregnant solutions will migrate to the cathode, being reduced to metallic gold [64][65][66][67]. However, it is also not a feasible choice because undesirable reactions of other anions including copper (I) thiosulfate complexes, sulfur-oxygen anions and other metal thiosulfate complexes in the solutions can occur on the electrode surface.…”

Section: High Requirements On the Solution Ph Values Resin Adsorptionmentioning

confidence: 99%

See 1 more Smart Citation

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

Dong

Jiang

et al. 2017

Metals

View full text Add to dashboard Cite

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.

show abstract

Section: High Requirements On the Solution Ph Values Resin Adsorptionmentioning

confidence: 99%

“…Ammonia-free thiosulfate leaching process by Barrick Gold Corporation to treat a carbonbearing sulfide gold ore pretreated with acidic or alkaline pressure oxidation [4,5]. [64][65][66][67] Low current efficiency and high energy consumption due to the undesirable reactions Difficulty in cyclic utilization of pregnant thiosulfate solutions…”

Section: Introductionmentioning

confidence: 99%

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

Dong

Jiang

et al. 2017

Metals

View full text Add to dashboard Cite

show abstract

“…In this system, the enediol group of ascorbic acid is catalytically oxidized to dehydroascorbic acid at the gold surface. 24 The generated electrons then reduce Au 1+ from TPN-Au-AMT that is adsorbed on the gold surface to metallic Au 0 and TPN and AMT are released. The reaction results in the self-perpetuating deposition of gold on gold surfaces or autocatalytic gold deposition.…”

Section: Resultsmentioning

confidence: 99%

Direct Gold Plating Selectively on UV Modified Polymer Film Using Tiopronin-Gold

Endo

Tashiro

et al. 2015

J. Electrochem. Soc.

View full text Add to dashboard Cite

An economic and low toxicity gold plating process for bio-compatible device fabrication was investigated. A tiopronin-gold complex altered by mercaptothiodiazole or mercaptotriazole derivatives gave a form of the complex that could be reduced autocatalytically to enable electroless gold plating. Catalytic ca. 5 nm gold particles were selectively grafted into cycloolefin polymer and polyethylenenaphthalate film surfaces by adsorption of tiopronin-gold complex from solution into 20-30 nm deep ultra-violet light modified surface layers followed by reduction with sodium borohydride. Exposure of the catalyst adsorbed surfaces to baths composed of tiopronin-gold complex, mercaptothiodiazole and ascorbic acid resulted in selective electroless plating on the modified surfaces. Observation of the interface cross-section by transmission electron microscopy revealed that the gold deposits were physically anchored to the substrate by nanometer scale octopus trap like structures. Bio-compatible electronics for in vivo application represent an innovative field of medicine, offering ailment for life quality debilitating health complications. In the applications, sensors and transducers read or relay electronic input or output directly to or from living biological systems, like the brain. In retinal and cochlear neuroprosthesis, neural array implants facilitate direct stimulation of optic nerves with signals from a miniature camera, or direct stimulation of cochlear nerves with signals from a microphone. Research involving conscious neural control to operate external devices like prosthetic robots has also been undertaken. Neural electrode arrays also serve in therapeutic stimulation, bypass or diagnosis of specific neural systems in stroke and head injury patients and in patients suffering from Parkinson's disease, epilepsy, dystonia and severe clinical depression.1-10 Another important application for in vivo electronics is sensors and MEMS on catheters, allowing sensory feedback to the operator or manipulation of a MEMS device internally.11,12 Micro in vivo electronic sensors also offer a means of less invasive direct monitoring by wireless transmission or aid efficient pharmaceutical release. 13Non-toxic, non-allergenic and inert gold and platinum can be used as electrode materials; however toxins and allergens should be avoided in fabrication. Economic plating techniques that rely on bath components and construction materials that are toxic or allergenic introduce health risks and are therefore difficult to implement in fabrication. One approach for deposition of biocompatible gold patterns on poly(dimethylsiloxane) has been described using chemical plating and electrochemical etching. 14 In medicine, tiopronin (TPN) has been used therapeutically as a treatment of cystine disulfide related ailments like cystinuria and prophylaxis of renal cystine calculi, functioning based on an increase in solubility. 15,16 Tiopronin capped gold nanoclusters/nanoparticles (TPN-AuNP) have also been a center of attention in a broad spectrum...

show abstract

“…Kohl (1995, 1997) have demonstrated that the gold reduction performance in a thiosulfate bath was comparable to a cyanide bath, electrochemically. 56,57) Stripped resin is regenerated by a 10 vol% HCl solution and recycled back to the gold adsorption stage.…”

Section: Feasibility Of Perchlorate Elution Processmentioning

confidence: 99%

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

2003

View full text Add to dashboard Cite

Copper catalyzed ammonium thiosulfate leaching process has been proposed as an alternative gold extraction process to cyanidation. In order to recover gold from the ammonium thiosulfate solution, ion exchange process has been proposed as a gold recovery method using strongly basic anion exchange resin. However, the co-adsorption of copper along with gold causes difficulty in separating gold and copper at the gold elution stage. Our previous study has demonstrated that nickel catalyzed ammonium thiosulfate solution for gold extraction has the advantage of reducing thiosulfate consumption. In this study, the results also demonstrated the advantage of gold recovery from the nickel catalyzed ammonium thiosulfate solution by strongly basic anion exchange resin. The optimal gold loading conditions on a 1 g/dm 3 strongly base anion exchange resin (wet base value) are investigated in several ion concentrations and 95 kg-Au/t-resin has been obtained. The alternative gold eluant was investigated as the gold loaded resin cannot be eluted by conventional hydrochloric acid. Results showed that the elution efficiency was in the order of OHThe maximum gold recovery by using 2.5 mol/dm 3 ClO 4 À was around 98% with the stripped resin assayed as 0.2 kg/t Au. The feasibility of resin recycling has demonstrated that there was no deterioration in gold adsorption and desorption for four cycles.

show abstract

The Autocatalytic Deposition of Gold in Nonalkaline, Gold Thiosulfate Electroless Bath

Cited by 53 publications

References 6 publications

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

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

Direct Gold Plating Selectively on UV Modified Polymer Film Using Tiopronin-Gold

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

Contact Info

Product

Resources

About