Leaching and Recovery of an Oxide Gold Concentrate Using …
Thiosulfate leaching-resin adsorption recovery, an environmentally friendly process, has been developed to efficiently extract gold from an oxide gold concentrate. 80.5% of gold extraction could be achieved by thiosulfate leaching under the conditions of (NH 4) 2 S 2 O 3 0.2 mol/L, CuSO 4 0.025 mol/L, NH 3 1.5 mol/L and leaching time 8 h, …
A fundamental study of the alkaline sulfide leaching of …
4. In the present paper, a kinetic study of gold leaching in alkaline sulfide solutions is presented. For the gold leaching system, both a complexing lixiviant and an oxidant are …
A review of gold extraction using noncyanide lixiviants: …
Alkaline sulfur-containing lixiviants, including thiosulfate, polysulfides, and alkaline sulfide solutions, stand out as a promising class of alternatives to cyanide …
Recovery of gold from refractory gold ores: Effect of pyrite …
The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of …
Gold Extraction from a Refractory Sulfide Concentrate by …
Most gold deposits occur associated with sulphides like pyrite and arsenopyrite; thus, precious metal dissolution is possible by oxidizing auriferous sulfide concentrate using simultaneous pressure oxidation and cyanidation. The effectiveness of this process of extraction can be influenced by the temperature, cyanide (NaCN) …
Increased Recovery of Gold Thiosulfate Alkaline Solutions by …
Likewise, it is important to remark that using thiosulfate instead of cyanide in the gold leaching step would constitute an advancement towards displacing cyanidation as the main technology to ... respectively. Finally, peaks that appear in the anodic region could be attributed to sodium thiosulfate and sodium hydrogen sulfite species [14,23 ...
Recovery of gold from sulfide refractory gold ore: Oxidation …
Most of the gold in the roasting slag is recovered by thiourea/cyanide leaching process, however, the leaching residues (gold tailings) obtained from thiourea leaching process or the sodium cyanide leaching still contain 9–16 g/t gold, which is difficult to recover and is usually discarded with the leaching residues; This …
Recovery of Gold from Pregnant Thiosulfate …
Gold leaching from its ores using thiosulfate solutions has been extensively investigated and is relatively well understood over the past several decades ... With the addition of 0.1 M sodium sulfite, however, …
A review of environmentally friendly gold lixiviants: …
Polysulfide leaching of gold has the advantages of a fast-leaching speed and high leaching rate; moreover, it is remarkably effective for the leaching of …
Selective Pre-leaching of Tellurium From Telluride-Type Gold
This process first concentrates telluride-type gold ore, then follows by oxidative roasting, cyanide leaching, polysulfide leaching, sodium sulfite reduction, and other processes to recover tellurium and gold (Zhou and Chen, 2008). This method has a complicated process and high investment cost, and is difficult to apply to other …
Effect of Pyrite and Quartz on Silver Leaching During Gold …
So in this paper, with a silver-containing gold ore taken as the research object, the effects of additive sodium sulfite, main gold-bearing mineral pyrite and gangue mineral quartz on silver leaching during roasting process are studied by roasting leaching test, SEM-EDS analysis, thermodynamic calculation and TG-DSC analysis.
sodium thiosulphate And hypochloride leaching | Gold …
No,no,no. gentle men, i do not dispute anachronism,ruther iam.saying, can sodium sulfite drop both gold and silver so the leachant can be regenersted for reuse! look at my situation, ... cynide is highly restricted not even seen anyway. only option left is probably thio. if sodium sulfite generates leach and drops Ag& Au, ...
(PDF) A systematic review of gold extraction: …
Therefore, the cyanide-sulfite system was . ... kinetics of gold leaching (Byerley et al., 1973; Fleming, 1986; ... sodium hydroxide (NaOH) solutions. Sulfide, polysulfides, and sodium thiosulfate ...
Thiosulfate leaching of gold—A review
The sodium sulfite slurry is prepared by passing sulfur dioxide through soda ash solution. Oxidation of polysulfides generates thiosulfate as follows (Greenwood et al, …
A systematic review of gold extraction: Fundamentals, …
Malononitrile was comparable to equal molar quantities of sodium cyanide in leaching gold from oxide ore and yielded 10–20 % higher recovery in leaching a refractory carbonaceous ore, although dissolution was slower with malononitrile than with cyanide (Heinen et al., 1970). Nitriles are also toxic, but they are far less harmful than cyanide.
Review Recovery of gold from secondary sources—A review
Ferrous sulfate, sodium sulfite, potassium sulfite, sulfur dioxide and hydrogen peroxide, formic acid and formaldehyde: Oliver and Richard, 1974: Adsorption: ... Chloride gold leaching is more difficult to apply than cyanide leaching for two main reasons: (1) special stainless steel and rubber-lined equipment are required to resist the …
Selective Pre-leaching of Tellurium From Telluride-Type Gold …
This process first concentrates telluride-type gold ore, then follows by oxidative roasting, cyanide leaching, polysulfide leaching, sodium sulfite reduction, and other processes to recover tellurium and gold (Zhou and Chen, 2008). This method has a complicated process and high investment cost, and is difficult to apply to other …
The role of ligands and oxidants in thiosulfate leaching …
Selected leaching results Unlike gold cyanidation, thiosulfate leaching involves relatively high concentrations of reagents, while the gold extraction is largely dependent on the presence or absence of various background reagents. The complexity of thiosulfate leaching of gold is exemplified in Figure 1 (14). It shows that sulfite,
Sequential removal of selenium and tellurium from copper …
A process using soda roasting–alkaline leaching–acid leaching to remove selenium, tellurium and copper sequentially from the copper anode slime with high content of Ni was tested. ... Recovery of gold from secondary sources—A review [J] ... Leaching kinetics of selenium from selenium–tellurium-rich materials in sodium sulfite solutions ...
Gold Leaching Using Thiourea from Uranium Tailing …
Compared with leaching without sodium sulfite, the addition of sodium sulfite significantly increases gold dissolution. This effect becomes more pronounced as the sodium sulfite concentration is increased. Without using any stabilizing additives, only 45% of the gold is recovered from the leach solution.
Metals | Free Full-Text | A Pretreatment of Refractory Gold …
The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold …
Selective Electrochemical Gold Recovery from Leaching …
[15] Feng D. and van Deventer J. S. J. 2006 Ammoniacal thiosulphate leaching of gold in the presence of pyrite Hydrometallurgy 82 126. Crossref; Google Scholar [16] Grosse A. C., Dicinoski G. W., Shaw M. J. and Haddad P. R. 2003 Leaching and recovery of gold using ammoniacal thiosulfate leach liquors (a review) …
Leaching Kinetics of Antimony from Refractory Gold Ore …
The leaching kinetics of antimony from refractory gold ore in alkaline sodium sulfide was investigated under ultrasound. The influence of factors such as stirring speed, temperature, the concentration of sodium hydroxide and sodium sulfide and particle size, was studied. The leaching kinetics has also been studied under …
An environmentally friendly process to selectively recover …
In the leaching process, due to the small stable constant of Ag (SO 3) 2 3 − which was measured to be 7.9 (Baltrunas et al., 2008) and readily oxidizing sulfite by oxygen dissolved in aqueous solution, a high concentration of sodium sulfite is inevitably implemented for the silver recovery, consequently, leading to a high consumption …
Effects of pyrite, quartz and sodium sulfite on roasting of a
DOI: 10.1016/j.hydromet.2024.106306 Corpus ID: 269143036; Effects of pyrite, quartz and sodium sulfite on roasting of a refractory sulfide concentrate and gold, silver, copper leaching during cyanidation
Sulphide Leaching
Methods of leaching sulphide ores can be: in absence of oxidizing agents in presence of oxidizing agents Bacterial leaching Absence of oxidizing agents Acid leaching: Dilute acids dissolve some metal sulphides with liberation of H2S, e.g. ZnS + 2H+ ^ Zn2+ + H2S Three types of sulphides can be encountered. ... Sodium cyanide has a solvent …
Ammoniacal thiosulphate leaching of gold ore
Ammoniacal thiosulphate leaching of gold ore R.K. Rath, N. Hiroyoshi, M. Tsunekawa*, T. Hirajima Laboratory of Mineral Processing and Resources Recycling, Graduate School of Engineering, ... Sodium thiosulphate (Na 2S 2O 3·5H 2O), Ammonia water (28% NH 3) and Cupric sulphate (CuSO 4·5H 2O).
Recovery of tellurium from high tellurium-bearing materials …
Semantic Scholar extracted view of "Recovery of tellurium from high tellurium-bearing materials by alkaline sulfide leaching followed by sodium sulfite precipitation" by Guo Xueyi et al. ... when eliminating the adverse effects ofTelluride on the leaching of gold and silver, provides new ideas for the extraction of rare elementtellurium. ...
Gold Leaching in an Alkaline Thiourea Solution
Gold leaching by thiourea has been investigated in an alkaline solution. In the presence of both Na 2 SO 3 and Na 2 S 2 O 8, the chemical dissolution of gold can be accomplished in the alkaline thiourea solution. It was found that used as a buffer, SO 2- 3 can prevent thiourea from further decomposing into some insoluble species in contact …
Electrochemical Behavior of Sodium Sulfite in Alkaline …
The polarization curves and AC impedance spectroscopy of gold and platinum electrodes were measured by an electrochemical workstation to study the effect of sodium sulfite on the dissolution of gold in alkaline thiourea solution. The results showed that the corrosion potential (Ecorr) of gold with sodium sulfite was -0.776 V, which is far below that of …