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The leaching reaction of silver from the burrows, in the oxygen–thiosulfate–copper system involves two types of silver compounds that were adequately leached (metallic silver and silver sulfide). The order of the reaction with respect to the thiosulfate concentration was n = 0.074 in the range studied, showing a poor …
Increasing the salt concentration and temperature can promote the recovery of lead; therefore, biological leaching combined with brine leaching can remove lead from lead and zinc tailings. Using only biological leaching under the best conditions to recover lead yielded 4.12% lead, while the addition of sodium chloride at a concentration of 150 ...
Ammonia-thiosulfate-copper leaching, aided by a direct current electrochemical impact, is proposed to extract gold (Au), silver (Ag) and copper (Cu) from old flotation tailings mixed with waste ...
The reagents used for flotation are generally not toxic, which means that tailings disposal costs are low. Flotation will frequently be used when gold is recovered in conjunction with other metals such as copper, lead, or zinc. Flotation concentrates are usually sent to an off-site smelting facility for recovery of gold and base metals.
BHPBilliton owns and operates the Cannington lead-silver-zinc mine and concentrator located in north-west Queensland, Australia. The concentrator uses sequential flotation to selectively float a lead-silver concentrate and a zinc concentrate. Current flotation practice at Cannington allows for valuable amounts of silver to report to the flotation tailings …
The kinetic study carried out indicates that the process involved in the leaching treatment of mining tailings for silver was only slightly affected by the stirring rate in the range studied; the reaction orders were 1 (oxygen partial pressure 0.2–1 atm), 0.074 (thiosulfate concentration 100–500 mol·m − 3), 0.455 (pH 4–12) and 0.26 ...
During the oxygen pressure acid leaching of sulfide ore for copper and zinc, most of the sulfur combined in sulfide is oxidized to S0 and enters the leaching residue, and a small part of them is excessively oxidized to SO 4 2− to supplement the consumption of sulfuric acid; and the lead sulfide forms lead sulfate and precipitates into the ...
Ultra-fine grinding (UFG) was proposed as a pre-treatment method prior to cyanide leaching of old plant tailings of a refractory silver ore. Direct cyanidation of the as-received tailings (d80 ...
Leaching Gold and silver with an alternative system: Glycine and thiosulfate from mineral tailings. Journal of Metals. 2019; 72 (2):918-924. DOI: 10.1007/s11837-019-03652-z; 35. Mahmoud M, Awad HM. Improved recovery of gold and silver from thiosulfate solution on activated carbon in presence of ammonium persulfate.
This study presents a novel approach for the recovery of silver from ammoniacal thiosulphate solutions through its precipitation using trimercapto-s-triazine …
The kinetic study carried out indicates that the process involved in the leaching treatment of mining tailings for silver was only slightly affected by the stirring …
For the leaching of silver from the insoluble residue left after hydrometallurgical processing of a lead–zinc sulfide concentrate, solutions of potassium thiocyanate, as well as sodium thiosulfate, were used with concentrations varying from 0.1 to …
As high-grade ores are depleted, the reprocessing of mine tailings to extract residual valuable metals/minerals is now getting increased attention. Godirilwe et al. studied Cu recovery from mine tailings via flotation, high pressure oxidation leaching (HPOL), and SX-EW process. After flotation of mine tailings, the grade of Cu was upgraded from ...
A large amount of acid-leaching residue is produced during the conventional Zn hydrometallurgy process, and this residue has a large concentration of a variety of valuable metals. The purpose of this study was to evaluate the ability of a procedure that entails the use of sulfation roasting, water leaching, and chlorination leaching (blowing …
The ammonium thiosulfate leaching of pressure-oxidized carbonaceous ore and various sulfide concentrates has been recently evaluated by Breuer et al. (2014). A comparison cyanide leaching and thiosulfate of gold for various pressure-oxidized materials is shown in Figure 28.10. Thiosulfate conditions, which favored gold extractions similar to or ...
Poor silver recovery due to silver jarosite formation resulting in additional pretreatment costs (c) Treatment of high preg-robbing ores challenging unless non-cyanide routes are used such as the use of thiosulfate process at Goldstrike. 5.2.3 Bio-oxidation. Interest in bio-oxidation treatment of refractory gold ores increased during the 1970s ...
Due to public and environmental concerns over the use of cyanide in gold recovery from ores, renewed interests in thiosulfate leaching as an alternative have started growing. …
The sample consisted of 93–94% non-metallic and 5–7% metallic components, with 0.5192% copper, of which 93.64% was oxidized. Initially, a flotation process recovered 0.489% copper. Subsequently, an agitated acid leaching process assessed the effects of acid concentration, temperature, and time.
The gold extraction degree from flotation tailings with 80% content of 0.071 mm fraction was 50%, and that with 90% content of 0.071 mm fraction was 60%. ... Gold and silver extraction from Hellyer lead-zinc flotation middlings using pressure oxidation and thiourea leaching ... average gold extracted between the surface tailings and 1m deep ...
Michel, D. and Frenay, J., Electrochemical investigation of the thiosulfate gold leaching process. CIM Gold Symposium, Montreal. 1996. Murthy, D.S.R., Some studies on the extraction of gold and silver from lead-zinc sulfide flotation tailings through non-cyanide leachants, Transactions of the Indian Institute of Metals, 1991, 44(5) 349-354.
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 …
The concentrator uses sequential flotation to selectively float a lead-silver concentrate and a zinc concentrate. Current flotation practice at Cannington allows for valuable …
During the process of bioleaching, lead (Pb) recovery is low. This low recovery is caused by a problem with the bioleaching technique. This research investigated the bioleaching combination of bioleaching with brine leaching to remove heavy metals from lead-zinc mine tailings. The impact of different parameters were studied, including …
Under the optimized conditions, silver concentrate with silver content and recovery of 601.43 g/t and 83.41 %, respectively; iron powder with iron content of 96.39 …
A number of the more recent research efforts have targeted the development of pre-treatment strategies in order to improve recovery with thiosulphate. Balaz et al. [63] investigated the use of a mechanically-activated flotation concentrate from a complex copper–lead–zinc ore from Banska Hodrusa, Slovakia. Mechanical activation of the ...
Recovering gold from sulfide refractory gold ore has been an important guarantee for the sustainable development of gold industry, while there are many challenges in the treatment of sulfide refractory gold ore, such as environmental pollution and low gold recovery. In this study, A novel method for gold recovery from refractory gold ore was …
Ammonia-thiosulfate-copper leaching, aided by a direct current electrochemical impact, is proposed to extract gold (Au), silver (Ag) and copper (Cu) from old flotation tailings mixed with waste rock. Over 80 % of Au available in the waste material and over 75 % of Cu and Ag were ... recovery of gold and silver from pyrite concentrates using ...
The post-leaching of silver (Ag) from a non-sulfide lead-zinc (Pb-Zn) ore flotation tailing leach residue in a copper-ammonium thiosulfate solution was investigated.
... Increasing the temperature has only a mild effect on leaching rate (Deutsch and Dreisinger, 2013a,b). However, higher recovery of silver has been reported for …
[19] Chieng Pau, 2006, Recovery of Silver from Lead/Zinc Flotation Tailings by Thiosulfate Leaching, MPhill Thesis, School of Engineering, The University of Queensland, Australia. [20] Synanayake, G., M.Zhang, X.,2012, Gold Leaching bu Copper(II) in Ammoniacal thiosulfate Solutions in The presence of Additives.
Silver recovery in hydrometallurgical zinc plants has gener ally been performed by use of a high-acid or very-high-acid leach step following the neutral leach to solubilize zinc and iron in the calcine feed, leaving a silicious silver-bearing lead residue for further treatment in a lead smelter. Flotation
The recovery of gold and silver from a copper-bearing gold ore sample obtained from southern New Mexico was investigated using agitation leaching, bottle-roll and column leach techniques. These experiments were carried out with a low grade ore analyzing 2.1 g/t Au (0.061 ± 0.008 oz/ton), 56.7 g/t Ag (1.65 ± 0.12 oz/ton), and 0.86% …
To recover silver from tailings, various reagent systems, including chloride (Zhang et al., 2016), cyanide (Hernandez et al., 2014), thiourea (Li et al., 2012) and …
Recovery of silver from lead/zinc flotation tailings by thiosulfate leaching The University of Queensland UQ eSpace Due to public and environmental concerns …
Flotation will frequently be used when gold is recovered in conjunction with other metals such as copper, lead, or zinc. Flotation concentrates are usually sent to an off-site smelting facility ...
The use of ammoniumâˆ'thiosulfate solutions to leach gold and silver from the oxidizing leaching residue of copper sulfide concentrates was reported by BEREZOWSKY and SEFTON in 1979 [25]. The authors claimed that the leaching rate of gold was higher than that by conventional cyanidation and halogen leaching method.
The post-leaching of silver (Ag) from a non-sulfide lead–zinc (Pb–Zn) ore flotation tailing leach residue in a copper–ammonium thiosulfate solution was …
However, silver recovery from ZLR is uneconomic due to the low sliver content in ZLR which greatly decrease the hydrometallurgical efficiency. ... High purity metal lead recovery from zinc direct leaching residue via chloride leaching and direct electrolysis ... Leaching of silver contained in mining tailings, using sodium thiosulfate: …
In this paper, related studies about alternative lixiviants and methods such as cyanide, thiosulfate, thiourea, thiocyanate, polysulfides, halides, and microbial leaching are summarized. The history, fundamentals, advancements, and challenges of alternative lixiviants are fully concluded to provide a reference for cleaner gold production.
It can be seen from Table 1 that the main valuable element for recovery in the tailings is gold, ... facilitating gold leaching. The gold tailings was pretreated by ammonium bifluoride, and gold leaching efficiency was increased by 48.45 %. ... Microbially enhanced thiourea leaching of gold and silver from lead-zinc sulphide flotation. tailings ...
