All the industrially applied gold leaching methods (historical chlorine gas based leaching, dominating state-of-the-art cyanide gold leaching, processes at precious metals plants) suffer from the characteristics related to aggressive and even toxic The addition of copper ions (0.01 mol/L) can significantly accelerate the kinetics of gold leaching in thiosulfate solutions, and a gold extraction of 37.11% can be Leaching of Gold from an Oxide Gold Ore with
This article summarized the methods of non-cyanide leaching of gold: thiosulfate method, glycine method, halide method, lime sulfur mixture method, iodination The essence of the proposed process of enhancing heap leaching of gold consists in utilizing the action of a catalyst representing a reagent complex containing Enhancement of Gold Heap Leaching by Using a Reagent
1 Citations Metrics Abstract As the most promising alternative reagent to cyanide, thiosulfate has received renewed interest. However, the traditional Leaching of Gold with Copper-citrate-thiosulfate Solutions Jian Wang,Feng Xie,Yue Pan & Wei Wang Pages 916-925 Published online: 19 Aug 2021 Cite Leaching of Gold with Copper-citrate-thiosulfate Solutions
The study showed that 85.1% of gold was dissolved into leachate from different ores by leaching with glycine (1.5 kg/t) and potassium permanganate (3 kg/t) for ~ 48 h. The overall reaction during The main objective of this study is to examine the capacity of gold and silver leaching from a sulfide concentrate with copper-tartrate-thiosulfate solutions. Experimental parameters, including temperature, Metals Free Full-Text Leaching of Gold and
Direct Cupric Chloride Leaching of Gold from Refractory Sulfide Ore: Process Simulation and Life Cycle Assessment Marja Rinne,Heini Elomaa,Sipi Seisko The recycling of the leaching solutions demonstrates that maintaining a suitable concentration of copper ions and thiosulfate and a suitable solution pH are Eco-friendly leaching of gold from a carbonaceous gold
Mercury amalgamation is the method of choice to recover gold in artisanal and small-scale gold mining (ASGM). However, despite the low cost and simplicity of this method, the use of mercury presents serious health and environmental risks, as well as low efficiency in gold extraction. This study investigates the application of cyanide and Thiourea leaching of gold has attracted much attention because of its environmentally friendliness. Gold recovery from high-grade e-waste, uranium tailing material, mature dumps, etc., using thiourea Effect of Stabilizer on Gold Leaching with Thiourea
The well-documented toxicity and environmental concerns around the use of cyanide in the gold mining industry 12 has led to the adoption of the International Cyanide Management Code, a voluntary program intended The next step after leaching in the hydrometallurgical gold processing is the recovery of gold from the solution. In the gold mining industry, activated carbon is the most widely used extractant to recover gold from pregnant cyanide leach solution, known as carbon-in-leach (CIL), carbon-in-pulp (CIP), and carbon-in-columns (CIC) processesLeaching and recovery of gold from ore in cyanide-free glycine media
The ability of acidic chloride solutions to dissolve gold and refractory sulfides simultaneously has been recognized as a potential advantage of gold leaching (Lundström et al. 2015; and gold leaching efficiency have been observed with several ores (Ahtiainen 2020; Linge and Welham 1997; Pangnum and Browner 1996).This paper has reviewed the non-cyanide gold leaching reagents with much attention being paid to the novel eco-friendly synthetic gold lixiviants (NESGLs). Zn 2+, AsO 3 3− and AsO 4 3− on gold leaching in an acidic thiourea solution was investigated in this paper. Leaching results showed that the foreign ions had an adverse effect onA review of gold extraction using alternatives to cyanide:
The gold-loaded, highly reusable adsorbent could be readily eluted using Na 2 S 2 O 3 (3 mol/L), and > 90% of the gold could be recovered from the adsorbent in a thiosulfate gold leaching solution with Cu 2+-NH 3-S 2 O 3 2-as the leaching system. Most of the adsorbent in the pulp could be collected using a magnet, and this reduced theThe leaching behaviors of gold and silver from a complex sulfide concentrate in copper-tartrate-thiosulfate solutions were investigated in this paper. Experimental parameters, including temperature, initial pulp pH, and concentration of copper, tartrate, and thiosulfate, were systematically studied. The copper-tartrate Metals Free Full-Text Leaching of Gold and Silver from a
where k is the dissolution rate of gold (μmol m −2 s −1),. E a is the apparent activation energy (kJ/mol),. R is the molar gas constant (J mol −1 K −1),. T is the thermodynamic temperature (K),. A is a constant.. 3.3 Effect of Initial pH. Figure 3 shows the effect of the initial pH on gold dissolution in copper–tartrate–thiosulfate solutions. In the The mechanism of gold leaching in copper-tartrate-thiosulfate solutions is catalyzed by the mononuclear CuL 2 H-4 6− complex when the solution pH is beyond 10.5 based on thermodynamic analysis. The stability of the CuL 2 H -4 6− complex increases with an increase in the tartrate content and decreases with increasing copper and thiosulfateEco-friendly leaching of gold from a carbonaceous gold
The gold-loaded, highly reusable adsorbent could be readily eluted using Na 2 S 2 O 3 (3 mol/L), and > 90% of the gold could be recovered from the adsorbent in a thiosulfate gold leaching solution with Cu 2+-NH 3-S 2 O 3 2-as the leaching system. Most of the adsorbent in the pulp could be collected using a magnet, and this reduced therate of gold leaching from sulfide ores in copper-ammonia-thiosulfate solutions. Gold extraction can be effectively promoted from 69% to 94% following 22 h of pretreatment, and thiosulfate consumption can be reduced from 2.37 kg/t-ore to a negligible extent [42]. Zhao et al. proposed a process combining bio-oxidation followed by Leaching of Gold and Silver from a Complex Sulfide
investigated by means of chloride-ion-based solution leaching. In this study, the addition of NaCl and optimization of chloride-ion-based leaching of gold was analyzed by using the Taguchi Method. Indonesia gold ore processed from artisanal mining was utilized in this study. The solutions of HCl (11.6 mol/L)-H 2 O 2 (1 vol%) were used asThiourea leaching of gold, despite first being reported in 1941 [], has never been clearly established into industry.Only a few industrial applications were reported between 1984 and 1992 [] although more recently, Birloaga et al.[] report on the development of a pilot plant.The plant, part of the FENIX project, consists of two Thiourea Leaching: An Update on a Sustainable Approach for Gold
These studies have shown that the addition of ammonia to the cyanide solution results in a lower cyanide consumption and a higher selectivity of gold leaching over copper. However, the rate of gold leaching is slower in this system when ammonia is used; in addition, it also represents an occupational health and environmental concern [ 24 ].Semantic Scholar extracted view of "Chloride–hypochlorite leaching of gold from a mechanically activated refractory sulfide concentrate" by M. G. Hasab et al. Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the hypochlorite leachingChloride–hypochlorite leaching of gold from a mechanically
The mechanism of gold leaching in copper-tartrate-thiosulfate solutions is catalyzed by the mononuclear CuL 2 H-4 6− complex when the solution pH is beyond 10.5 based on thermodynamic analysis. The stability of the CuL 2 H -4 6− complex increases with an increase in the tartrate content and decreases with increasing copper and thiosulfateWen-juan Li E-mail: juanzi88888@126. Electrochemical measurements were conducted to study the electrochemical behavior of gold (Au) and its commonly associated minerals in alkaline thiourea solutions. The results indicated that without addition of any stabilizer, selective dissolution of Au from stibnite and pyrite was only possible atElectrochemical behavior of gold and its associated minerals
Gold extraction from ores using non-cyanide lixiviants is currently a significant topic worldwide. Herein, we report the synthesis of an eco-friendly lixiviant that not only is much less toxic than sodium cyanide (NaCN) but also shows excellent effect in the leaching of gold. The lixiviant can be synthesized from roasting of the well-mixed Recycling of waste printed circuit boards (PCBs) has attracted increasing attention because of its high annually produced amount and high content of gold. In this study, gold recovery from waste PCBs was carried out by using the processes including microwave pyrolysis, acid leaching, solvent extraction and oxidative precipitation. The Gold recovery from waste printed circuit boards of mobile
