Thiosulfate leaching of gold - A review | Request PDF

Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the …

A novel thiosulfate system for leaching gold without the ...

The thiosulfate lixiviant system for leaching of gold has been under extensive investigation for nearly two decades and consists of ammonium thiosulfate, copper and ammonia.

Effect of additives on thiosulfate leaching of a gold ore

after 11 h leach. In a resin-in-leach system, full gold recovery was also achievable with sufficient resin after 24 h leach with 0.06 M fresh ammonium thiosulfate and 2 mM EDTA at an agitation speed of 250 r/min. Key words: Gold leaching, Thiosulfate, Additives, Leaching kinetics, Thiosulfate stability INTRODUCTION

ammonium thiosulfate for gold in situ extraction project ...

using iodine to assay gold ore palmietvalleyestate.co.za. The use of copper as a alyst for gold leaching in ammonium thiosulfate solution might cause the high consumption of On a 100 mass% 75 цm of silie type gold ore containing 16 g/t Au and iodine, thiocyanate and thiosulfate.1624) Among these lix .. was dried in an oven, and assayed for gold by the fire …

Effect of Silver in Thiosulfate Leaching of Gold–Silver ...

A review is presented summarising the leaching of gold with ammoniacal thiosulfate solutions, and evaluating the current use and development of ion exchange resins for the recovery of gold and ...

A Review on Alternative Gold Recovery Reagents to Cyanide

Chlorination, Aqua Regia, Bromine, Thiocyanate, Thiosulfate and Thiourea leaching.For this pro- pose, the gold leaching reagents are described and discussed in terms of their environmental and economical points of view. As result of this comparison, thiourea stands out as the most promising ... Present work aims to present a review on the ...

THIOSULFATE LEACHING OF GOLD--A REVIEW__

Thiosulfate leaching of gold--a review 167 T A B L E 6 Potentials for the reduction of gold complexes to gold metal f r o m a solution containing gold at 10 -s M Ligand Ligand Concentration E° (versus SCE) E (versus SCE) (M) Thiourea Thiocyanate Thiosulfate Chloride Cyanide 10 -1 10 -2 10 -1 10 -2 10-1 10 -2 10 -1 10 -2 10 -1 10 -2 (v) (v) 0. ...

The role of ligands and oxidants in thiosulfate leaching ...

article reviews some leaching results and the current status with respect to important stoichiometric relationships of chemical reactions, speciation, as well as detailed mechanisms for anodic or chemical oxidation of gold in thiosulfate solutions. The role of ligands and oxidants in thiosulfate leaching of gold Gamini Senanayake

Leaching of Gold from the Waste Mobile Phone Printed ...

The rapid growth in the use of electronic equipments, combined with early obsolescence has contributed enormously to the generation of large quantity of electronic (e) waste. One such e-waste, the mobile phone printed circuit boards (PCBs) contain various precious metals which can be extracted by different hydrometallurgical routes. The present work deals with the recovery of gold using ...

دانلود رایگان مقاله با ترجمه : سینتیک لیچینگ تیوسولفات طلا ...

دریافت مقاله با ترجمه فارسی sciencedirect : Thiosulfate leaching kinetics of gold in the presence of copper and ammonia دانلود رایگان مقاله ... Thiosulfate leaching of gold—A review, Minerals Engineering on ScienceDirect.

ammonium thiosulfate for gold in situ extraction project ...

using iodine to assay gold ore palmietvalleyestate.co.za. The use of copper as a alyst for gold leaching in ammonium thiosulfate solution might cause the high consumption of On a 100 mass% 75 цm of silie type gold ore containing 16 g/t Au and iodine, thiocyanate and thiosulfate.1624) Among these lix .. was dried in an oven, and assayed for gold by the fire assay.

Ammoniacal thiosulfate leaching of refractory oxide gold ...

Jul 10, 2017· Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au.

Thiosulfate leaching kinetics of gold in ... - ScienceDirect

Thiosulfate leaching kinetics of gold in presence of copper and ammonia 1073 RESULTS AND DISCUSSION Gold leaching kinetics Gold leaching rates for various solution conditions were measured using a REQCM. Figure 1 shows a typical leach curve for gold leaching in solutions containing thiosulfate, copper and ammonia.

(PDF) Direct leach approaches to Platinum Group Metal (PGM ...

Direct leach approaches to Platinum Group Metal (PGM) ores and concentrates: A review ... A review. Article (PDF ... Some of the reported data on chloride and thiosulfate leaching of gold are ...

Effect of activated carbon on the thiosulfate leaching of ...

The cyanide and thiosulfate leach recoveries for sample S1 were 81.3 and 26.2%, respectively, indicating that the ore was refractory to thiosulfate leach; the possible causes for this refractoriness are thought to be related to the rate of oxygen reduction on the surface of …

The effect of solution parameters on the thiosulfate ...

Sep 10, 2014· In the thiosulfate leaching of gold, one of the main reagents is copper (II). The major role of the cupric ion in the thiosulfate leaching system is to catalyze the dissolution of gold (Breuer and Jeffrey, 2000). Copper, as an oxidant, can also enhance the degradation of thiosulfate and increase its consumption in the process.

Gold leaching by organic base polythionates: new non-toxic ...

The article present a review on own experimental and some published data which are related with the gold leaching. It is well-known that the most common and usual process of the leaching with cyanide can be dangerous, needs a great water consumption, and additional costs for remediation of the poisoned and toxic sites.

Sodium Thiosulphate Gold Leaching

The gold industry has been seeking alternative reagents for leaching gold from low-grade ores for the past 25 years. The cost and transport of cyanide, the poor recovery of gold from carbonaceous ores, the lack of selectivity of cyanide towards copper minerals and the cost of waste treatment are real factors which can make cyanide unattractive in some circumstances.

Thiosulfate leaching of gold—A review - ScienceDirect

Thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous-type ores. In addition, thiosulfate can be cheaper than cyanide.

cyanidation process for silver extraction

Cyanidation kinetics of silver sulfide - ScienceDirect. A mathematical model for silver leaching by cyanidation, which considers the redox reaction and complex equilibria in the solution phase, was developed. Silver sulfide leaching from mineral particles was found to be a kinetically controlled process, strongly influenced by solubility phenomena.

(PDF) A Review of Thiosulfate Leaching of Gold: Focus on ...

A Review of Thiosulfate Leaching of Gold: Focus on Thiosulfate Consumption and Gold Recovery from Pregnant Solution Article (PDF Available) in Metals - Open Access Metallurgy Journal 7(6):222 ...

Leaching and recovery of gold using ammoniacal thiosulfate ...

A review is presented summarising the leaching of gold with ammoniacal thiosulfate solutions, and evaluating the current use and development of ion exchange resins for the recovery of gold and silver from such leach liquors. Comparisons are also made with other recovery processes, including carbon adsorption, solvent extraction, electrowinning and precipitation.

Associated Sulfide Minerals in Thiosulfate Leaching of ...

Thiosulfate-copper-ethylenediamine system was found effective in the leaching of gold. The leaching kinetics was significantly slower than that of the conventional thiosulfate-copper-ammonia leaching. The consumption of thiosulfate, however, was largely reduced. This leaching system worked

Research on leaching of carbonaceous ... - sciencedirect.com

Jun 15, 2019· Thiosulfate leaching is considered to be a promising method for carbonaceous gold ore treatment because of low affinity of gold thiosulfate complex to activated carbon (Gallagher et al., 1990, Aylmore et al., 2014). Many reports on the use of thiosulfate solutions to extract gold from carbonaceous ores have been published.

Thiosulfate leaching of gold from a mechanically activated ...

Thiosulfate leaching of roasted concentrate resulted in 98% gold and 93% silver recovery after 48 hours.Under the conditions used in this study, reagent consumption was high ranging from 36 …

Metallurgical recovery of metals from ... - sciencedirect.com

In the last decade, attentions have been removed from pyrometallurgical process to hydrometallurgical process for recovery of metals from electronic waste. In the paper, hydrometallurgical processing techniques including cyanide leaching, halide leaching, thiourea leaching, and thiosulfate leaching of precious metals are detailed.

COMPARISON OF CYANIDE AND THIOSULPHATE …

review one promising alternative lixiviant, thiosulphate, has been considered along with cyanide for gold leaching. These two lixiviants have been compared based on the information available in scientific literature. Thiosulphate leaching can be considered as a …

An Electrochemical and SERS Study of the Gold-Thiosulfate ...

the behavior and composition of the passive layer formed at the gold-thiosulfate interface in the presence of copper. Raman studies of three different cationic (calcium, ammonium and sodium) thiosulfate leaching solutions showed that the concentrations of sulfate, thiosulfate, trithionate and tetrathionate remained constant.