sodium sulfite and gold leaching
Review Recovery of gold from secondary sources—A review
ResultFerrous 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 …
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Increased Recovery of Gold Thiosulfate Alkaline Solutions by …
ResultGo to: Abstract. Thiosulfate leaching combined with ion-exchange resins is an innovative alternative for gold recovery. According to the properties of …
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Minerals | Free Full-Text | Effect of Stabilizer on Gold …
ResultMohammed R. Ahmed et al. showed that the presence of sodium sulfite can significantly reduce thiourea decomposition, accelerate the gold …
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Extraction of gold and silver from Turkish gold ore by …
ResultSodium sulfite concentration varied between 0 and 0.2 M and ... An acceptable gold leaching rate of 0.18 to 0.27 μmol·m⁻²·s⁻¹ could be obtained under the conditions of above 0.1 mol/L ...
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Minerals | Free Full-Text | Effect of Stabilizer on Gold Leaching …
ResultThe thiourea gold leaching cyclic voltammetry curves are shown in Figure 2a,b for sodium sulfite and sodium silicate, respectively. As shown in Figure 2 a, with Na 2 SO 3 as a stabilizer and with positive scanning, the cyclic voltammetry curve of this system had its first oxidation peak at 0.16 V, which matched the …
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Anode current on gold in mixed thiosulfate-sulfite electrolytes
ResultThe anodic current in individual and mixed thiosulfate-sulfite solutions was studied by means of voltammetry on a fresh gold RDE surface. An unexpected result was obtained: a new additional current maximum appears on the anodic voltammogram in mixed solutions; it is not observed in the individual solutions of …
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Recovery of gold from refractory gold ores: Effect of pyrite …
ResultY.H. Hu, G.F. Guo, and G.Z. Qiu, Study on mechanism of gold leaching by thiourea in the presence of sodium sulphite, J. Cent. South Univ. Technol., 7(2000), No. 3, p. 113. Article CAS Google Scholar S. Ardiwilaga, Effects of cysteine and oxygen on recovery of cemented gold from leach liquors in a …
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Cyanide-free gold leaching in exceptionally mild chloride …
ResultCyanide-free mild chloride leaching was investigated. •. Gold could be recovered even at <520 mV vs. Ag/AgCl in carbon-in-chloride-leach mode. •. Copper was a stronger oxidant than iron in gold leaching. •. Gold was oxidized by in-situ dissolving impurities. •. Seawater contains enough chlorides to dissolve gold.
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Leaching of Gold from an Oxide Gold Ore with …
ResultThe capability of gold leaching using copper–tartrate–thiosulfate solutions is comparable to that of cyanidation, as well as the traditional copper–ammonia–thiosulfate leaching system at elevated temperatures. ... (0.02 mol/L) were used to eliminate the interference of sulfite ions and copper–tartrate …
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Metals | Free Full-Text | Recovery of Gold from …
ResultA detailed discussion about the recent advances of the technique in gold recovery from pregnant thiosulfate solutions is then …
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Gold leaching by organic base polythionates: new non-toxic …
ResultThen the highly basic anion exchanger is regenerated with a solution of a mixture of sodium and ammonium sulfite and sulfate. After the highly basic anion exchanger regeneration, it is transferred to the process of the thiosulfate-gold complex sorption. ... Gold leaching by polythionates (new non-toxic technology) …
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Dissolution Behavior of Gold in Alkaline Media Using Thiourea
ResultBy including sodium sulfite in the gold-thiourea system, it was possible to obtain the Au(I)-TU complex at alkaline pH, with a presence of 95.13%. ... The gold leaching kinetics were monitored by ...
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Thiosulfate leaching of gold—A review
ResultAbstract. The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. The application to different ore types and process options have also been discussed. The thiosulfate …
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Gold Leaching Using Thiourea from Uranium Tailing …
ResultResults led to the conclusion that the leaching rate of gold with acidic thiourea was diffusion controlled, which was supported by the reaction activation energy of 9.32 kJ mol −1 in the absence of sodium sulfite and 7.62 kJ mol −1 in the presence of sodium sulfite. The efficiency of gold dissolution, which reached …
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Review of gold leaching in thiosulfate-based solutions
ResultGUDKOV et al [81] suggested that the addition of sodium sulfite could stabilize the leaching solution and accelerate the dissolution of gold and silver. However, sulfite ions will also cause a rapid reduction of copper ions which will …
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Selective Pre-leaching of Tellurium From Telluride-Type Gold
ResultThis 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 …
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Role of copper(II), carbonate and sulphite in gold leaching …
ResultThe gold leaching in oxygenated alkaline thiosulphate media obeys a shrinking core kinetic model with an apparent rate constant of the order 10 −5 ... (Ji et al., 2003) that show the effect of copper(II) sulphate, sodium carbonate and sodium sulphite on gold extraction and thiosulphate degradation in oxygenated non …
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Ion exchange adsorption and elution for recovering gold …
ResultFig. 2 shows the column elution profile for gold loaded resin at 5 BV h − 1 using 1 M ammonium nitrate in the presence and absence of sulfite. In the absence of sodium sulfite, the elution of gold with 1 M ammonium nitrate is still incomplete after 25 BV.Previous work (O'Malley, 2001) required concentrations of …
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Cyanide Leaching Chemistry & Gold Cyanidation
ResultMost agree that the overall cyanide equation for leaching and cyanidation of gold is as follows: 4 Au + 8 NaCN + O2 + 2 H20 = 4 NaAu (CN)2 + 4 NaOH. Cyanide Leaching Chemistry. In a relatively simple system of this type the gold dissolves readily. The only requirements are that the gold be free and clean, …
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Thiosulfate leaching of gold—A review
ResultThe ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. ... a slurry of sodium sulfite is digested with an excess of sulfur to produce thiosulfate. The sodium sulfite slurry …
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Silver leaching with the thiosulfate–nitrite–sulfite–copper …
ResultHighlights. Thiosulfate–nitrite–copper is a promising silver leaching alternative system. Cupric–ammonia complexes are produced in-situ without the addition of ammonia in the system. Antlerite and copper hydroxide are produced on the silver particle. Sulfite decreases the oxidative ability of the system and the …
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precipitating with sodium sulfite
ResultEither SMB or Sodium Sulfite, or even sulfur dioxide gas will work fine for reducing gold in HCl-Cl solutions. When highly concentrated the solution will lean towards deep orange to deep red when highly concentrated. I use dry SMB exclusively now days and never have had to heat the solution to get the gold to …
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Recovery of gold from sulfide refractory gold ore: Oxidation …
ResultThe gold leaching rate evidently increased with the reagent content and slurry temperature of the pretreatment, reaching a maximum of 86.55% at 60 °C and CaO and Na 2 CO 3 concentrations of 16 and 32 g/L, respectively. ... The effects of sodium sulfide and sodium hydroxide concentration, temperature, leaching …
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A novel bio-oxidation and two-step thiourea leaching …
ResultAs shown in Table 4, the concentrations of TU were still > 1 g/L in all the three groups with additional sodium sulfite after gold leaching. Especially in X-3 and W-3, in which the concentrations of the lixiviant even remained at 1.27 ± 0.05 g/L and 1.58 ± 0.07 g/L, which meant that only half of the TU reagent was …
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Thiourea Leaching: An Update on a Sustainable Approach for …
ResultRizki et al. reported that although the addition of sodium sulfite to the leaching system did not improve the gold recovery, the remaining thiourea in …
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Sulfidic gold ore leaching by cysteine in the presence of …
ResultThereafter, an attempt was made to improve the efficacy of the leaching by adding sodium sulfite (Na 2 SO 3), which has been shown to improve the leaching efficiency of relatively unstable reagents like thiosulfate and thiourea by mitigating their oxidation as described in the following section (Marsden and …
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Recovery of tellurium from high tellurium-bearing
ResultA possible process for the recovery of tellurium from antimony and tellurium materials by alkaline sulfide leaching followed sodium sulfite precipitation was proposed. The tellurium and antimony materials were leached in 100 g/L Na 2 S solution at 80 °C for 60 min with L/S ratio of 10:1, in which 91.24% …
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Recovery of gold from sulfide refractory gold ore: Oxidation …
ResultMost 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 …
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A Review of Thiosulfate Leaching of Gold: Focus on …
ResultThiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold. In this review, the four solutions to reduce the consumption of thiosulfate, including the control of reaction …
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Recovery of gold from refractory gold ores: Effect of pyrite …
ResultThus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects …
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