Granular polyacrylonitrile with internal 3D channels for gold recovery from thiosulfate solution

The adsorption of gold and copper onto ion-exchange resins from ammoniacal thiosulfate solutions

Interfacial properties of mercaptopropyl-functionalised silica gel and its adsorption performance in the recovery of gold(I) thiosulfate complex

Making untreated carbon effective in cleaner thiosulfate system: A new and high-efficiency method including gold adsorption and desorption

Aliquat-336 impregnated chitosan microspheres for Au(I) extraction from thiosulfate solution: Preparation, adsorption mechanism, and application

The use of new modified activated carbon in thiosulfate solution: A green gold recovery technology

Thiosulfate leaching of gold—A review

Recovery of precious metals from ammoniacal thiosulfate solutions by hybrid mesoporous silica: 2 – A prospect of PGM adsorption

Preg-robbing of gold from cyanide and non-cyanide complexes: Effect of fungi pretreatment of carbonaceous matter

Gold recovery from pregnant leach solutions like pregnant thiosulfate leach solutions from goldcontaining solid wastes (e.g., e-waste) has gained considerable research attention in recent years due to the high market value and limited supply of gold.Although hydrogen peroxide (H2O2) is known as a green reducing agent since it liberates water and oxygen only as reaction by-products, recovery of gold from thiosulfate solutions via H2O2 reduction is still scarce.Hence, this work aimed to recover gold from thiosulfate solutions using H2O2 as a reducing agent.The reduction experiments were carried out by mixing gold(III)-containing thiosulfate solutions with H2O2, and the effects of different initial gold(III) concentrations (10-500 ppm), H2O2 concentrations (0.05-2 M), reaction temperatures (25-65C) on the gold recovery yield were investigated.The highest gold yield of over 98% was achieved with an initial gold(III) concentration of 50 0 ppm and a H2O2 concentration of 2 M at 60C.Therefore, H2O2 is a potential reducing agent for the recovery of gold from thiosulfate solution.

Recovery of gold ions from thiosulfate solution using an electrogenerative process

Since a high toxicity of cyanide which use as a reagent in the gold processing plant, thiosulfate has been recognized as a environmental friendly reagent for leaching of gold from ore. After gold leaching process it's important for recovery of gold from solution using adsorption or extraction methods, One of these methods is activated carbon.The loading of gold from industrial thiosulfate solution that obtained from Zarshuran gold plant-Takab-Iran, onto activated carbon have been investigated. The affecting variables of the adsorption of gold on the carbon included, temperature, concentration of gold, size of activated carbon, pH and the ratio of amount of activated carbon to the volume of solution. The results have shown that at low concentration of gold, effective loading can be achieved at pH 10.5. The size of activated carbon has a significant effect on the loading of gold. In this research the recovery of gold on activated carbon has been predicted using artificial neural network. For this purpose temperature, pH, the proportion of solution volume to weight of activated carbon, gold concentration and time of adsorption were taken as input parameters, whereas, the recovery of gold on activated carbon from thiosulfate solution was considered as an output parameter. The network with LMBP algorithm with two hidden layer were used and the topology 5-4-13-1 showed the best ability for prediction.Moreover sensitive analyze were indicated parameters pH and temperature have substantial influence on adsorption.

Recovery of precious metals from ammoniacal thiosulfate solutions by hybrid mesoporous silica: 3 – Effect of contaminants

Adsorption of the gold–thiosulfate complex ion ([Formula: see text]) on silver ferrocyanide (AgFC)-impregnated activated carbon in aqueous solution has been studied in order to find an effectual adsorbent for the thiosulfate extracting gold from ores. This study was performed using AgFC-impregnated activated carbon (AC-Ag-R-FC: AC: activated carbon, Ag: silver nitrate, R: heating, FC: potassium ferrocyanide) and an artificial aqueous solution of [Formula: see text]. Gold–thiosulfate complex adsorption kinetics and isotherm studies were carried out at pH = 9.0 on modified materials. It has been also found that the adsorption fits the intraparticle diffusion and Freundlich isotherm well. In order to understand the adsorption mechanism, raw and modified materials were characterized by N 2 adsorption–desorption measurements at 77 K, scanning electron microscopy and X-ray photoelectron spectroscopy. The maximum adsorption capability of [Formula: see text]on AC-Ag-R-FC is 3.55 kgt −1 . Clearly, the extraordinary adsorption capacity of AC for [Formula: see text] offers a new approach to address challenging gold–thiosulfate complex separation and could promote the future development of thiosulfate leaching gold process.

Grafting of organic sulfur-containing functional groups on activated carbon for gold(I) adsorption from thiosulfate solution

Sorption recovery of gold from thiosulphate solutions after leaching of products of chemical preparation of hard concentrates