Optimisation of the chlorination of gold in decopperized anode …
DOI: 10.1016/S0304-386X(99)00009-2 Corpus ID: 98668327; Optimisation of the chlorination of gold in decopperized anode slime in aqueous medium @article{Dnmez1999OptimisationOT, title={Optimisation of the chlorination of gold in decopperized anode slime in aqueous medium}, author={B{"u}nyamin D{"o}nmez and …
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Chlorination behaviors for green and efficient vanadium recovery …
The refined tailing, generated from refining of titanium tetrachloride (TiCl 4) for vanadium (V) removal, is a hazardous material to environment due to the high content of V. Aiming at effective and selective extraction of V from the refined tailing, a fluidized chlorination process was proposed in present work.The chlorination behaviors of the refined tailing …
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Solvent Extraction of Gold(III) with Diethyl Carbonate | ACS
Diethyl carbonate (DEC) was evaluated as a green, renewable alternative to methyl isobutyl ketone and dibutyl carbitol for the recovery of gold from copper-rich sources, such as anode slimes, by solvent extraction from chloride solutions. DEC is a powerful extractant at high chloride concentrations and can be used to sequester and concentrate gold from …
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Recovery and kinetics of gold and iron from cyanide tailings by …
DOI: 10.1016/j.mineng.2020.106453 Corpus ID: 219462783; Recovery and kinetics of gold and iron from cyanide tailings by one-step chlorination–reduction roasting @article{Wang2020RecoveryAK, title={Recovery and kinetics of gold and iron from cyanide tailings by one-step chlorination–reduction roasting}, author={Wei-Wei Wang and …
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Kinetic Investigation and Dissolution Behavior of Cyanide …
The leaching experiments with iodine, bromine and aqua regia showed the fastest and continuous gold dissolution over time. A significant influence of temperature on gold leaching was observed in all experiments. Iodine is capable to extract gold a very fast (average dissolution rate of 65.679 mg·h −1 ·cm −2 at 25 °C).
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Gold extraction by chlorination using a pyrometallurgical process
DOI: 10.1016/J.MINENG.2008.09.002 Corpus ID: 33692579; Gold extraction by chlorination using a pyrometallurgical process @article{Ojeda2009GoldEB, title={Gold extraction by chlorination using a pyrometallurgical process}, author={Manuel Ojeda and Ernesto Perino and Mar{'i}a del Carmen Ruiz}, journal={Minerals Engineering}, …
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Recovery of RE from Baotou rare earth concentrate with chlorination
A process for recovery of RE from Baotou rare earth concentrate was developed by fixing the fluorine and chlorinating RE with ammonium chloride in the ore. The optimum conditions were determined as follows: fixing the fluorine of the ore 80 min with the MgO dosage m(ore)/m(MgO)=3∶1 at 600 ℃; chlorinating the fixed fluorine calcine 80 min, with NH4Cl …
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Pore Evolution in Refractory Gold Ore Formed by Oxidation …
Flotation −preoxidation cyanidation methods are used to improve recovery of refractory gold, but the gold recovery is limited to 72.2% after only treatment by the flotation …
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Recovery of Gold and Iron from the Cyanide Tailings by Magnetic
High-temperature chlorination of gold with transformation of iron phase. Gold in cyanide tailings from Shandong Province is mainly encapsulated by hematite and magnetite at distribution rates of 76.49 % and 10.88 %, respectively. Chlorination–reduction one-step roasting….
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Heavy metal pollution caused by cyanide gold leaching: a case …
DOI: 10.1007/s11356-021-12728-w Corpus ID: 231841854; Heavy metal pollution caused by cyanide gold leaching: a case study of gold tailings in central China @article{Zhang2021HeavyMP, title={Heavy metal pollution caused by cyanide gold leaching: a case study of gold tailings in central China}, author={Chao Zhang and Xing …
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A green process for extracting gold
Using a solution of what is essentially reusable table vinegar, the team has shown that for CAD$66 (about US$47) it can produce one kilogram (2.2 lb) of gold with 100 liters (26 gal) of reusable ...
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Pyrite enhanced chlorination roasting and its efficacy in gold and
DOI: 10.1016/j.seppur.2020.117168 Corpus ID: 219740877; Pyrite enhanced chlorination roasting and its efficacy in gold and silver recovery from gold tailing @article{Qin2020PyriteEC, title={Pyrite enhanced chlorination roasting and its efficacy in gold and silver recovery from gold tailing}, author={Hong Qin and Xueyi Guo and …
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Recycling gold and copper from waste printed circuit boards using
Waste electric and electronic equipment (WEEE) usually contains many recoverable and valuable elements, including gold and copper. Primitive technologies, such as aqua regia leaching and calcination, are still widely used in China, which has caused serious pollution in local environments. Chlorination is a feasible alternative for the …
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Investigation on the recovery of gold from pretreated cyanide …
ABSTRACT In this work, a method for the extraction of gold from the cyanide tailings (CT) was investigated. Sulfuric acid was used as a pretreatment leaching solution and calcium hypochlorite was used as a chloride agent during the chlorination leaching. Under different conditions, the potential difference of the chlorination reaction is …
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[PDF] Simultaneous extraction of gold and zinc from refractory
DOI: 10.1016/s1003-6326(20)65282-7 Corpus ID: 219111726; Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process @article{Wang2020SimultaneousEO, title={Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process}, author={Hong-jun …
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Gold extraction by chlorination using a pyrometallurgical …
The chlorination equipment used in the laboratory has a simple design and permits a safer use of chlorine gas. References Deng, H., Li, X., 1987. Chloride roasting of a complex gold ore and treatment of chlorine fume for precious-metal recovery-experimental results. Transactions Institution of Mining and Metallurgy (C: Mineral Processing Extractive
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Non-toxic technology extracts more gold from ore
Non-toxic technology extracts more gold from ore. Study shows new chloride-based process recovers 84% of gold compared to the 64% recovered with traditional methods. Gold is one of the world's ...
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Gold processing
Gold processing - Refining, Smelting, Purifying: Gold extracted by amalgamation or cyanidation contains a variety of impurities, including zinc, copper, silver, and iron. Two methods are commonly employed for purification: the Miller process and the Wohlwill process. The Miller process is based on the fact that virtually all the impurities present in …
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Cleaner process: Efficacy of chlorine in the recycling of gold from
This study proposes a cleaner chlorine for effective utilization of cyanide tailings. Thermodynamic analyses reveal that the theoretical best chlorine source is …
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Pore Evolution in Refractory Gold Ore Formed by Oxidation …
results, and chlorination roasting is a promising method that can obtain gold recovery of 92% at 800 °C with a roasting time of 4 h. Nevertheless, the high roasting temperature and the long roasting time have restricted its wide commercial application.26,27 Flotation has been used to separate gold from raw ore, but the recovery of gold ...
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Cleaner recovery of multiple valuable metals from cyanide tailings …
ABSTRACT Recovery of valuable metals is hindered by sulfur in cyanide tailings. In this work, a process for the clean recovery of multiple valuable metals through chlorination roasting was proposed. HSC software was used to find that the process of dissociation of chlorides is further accelerated by sulfur in the tailings. Experiments were carried out to …
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Gold processing | Refining, Smelting & Purifying | Britannica
By 2000 bc the process of purifying gold-silver alloys with salt to remove the silver was developed. The mining of alluvial deposits and, later, lode or vein deposits required crushing prior to gold extraction, and this consumed immense amounts of manpower. By ad 100, up to 40,000 slaves were employed in gold mining in Spain.
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Pore Evolution in Refractory Gold Ore Formed by …
A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent. The …
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Gold recovery from waste printed circuit boards of mobile phones …
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 …
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Highly efficient and selective extraction of gold by reduced …
We observed ~99% gold recovery with <5 % of the other metals being extracted (Supplementary ... This research is supported primarily by National Key Research and Development Program of China (No ...
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Recovery of lithium from spodumene by chlorination roasting
thermodynamic analysis provided a better understanding of the chlorination roasting process for lithium extraction. Metallurgical tests with mass ratio of 1:6 (spodumene:chlorides) and molar ratio of 2:1 (MgCl 2:CaCl 2) allowed over 95% recovery of the lithium contained in the spodumene concentrate.
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Cleaner process: Efficacy of chlorine in the recycling of gold from
DOI: 10.1016/j.jclepro.2020.125066 Corpus ID: 228929249; Cleaner process: Efficacy of chlorine in the recycling of gold from gold-containing tailings @article{Li2020CleanerPE, title={Cleaner process: Efficacy of chlorine in the recycling of gold from gold-containing tailings}, author={Haoyu Li and Jinhui Peng and Hailin Long and Shiwei Li and Libo …
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High-temperature chlorination of gold with
Gold in cyanide tailings from Shandong Province is mainly encapsulated by hematite and magnetite at distribution rates of 76.49 % and 10.88 %, respectively. Chlorination–reduction one-step roasting of cyanide tailings was conducted under the following conditions: calcium chloride dosage of 6 %, bituminous coal dosage of 30 %, calcium oxide dosage of 10 % …
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Eco-friendly and rapid extraction of gold by in-situ catalytic
1. Introduction. The oxidative leaching of gold is the key step in gold metallurgy. Cyanidation has been the most viable technology and dominant means in the industry for the last 100 years [1, 2, 3].However, cyanide is lethal to humans since it causes tissue hypoxia and asphyxiation [].Poisoning symptoms will appear within a few seconds …
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Recycled Lithium from Simulated Pyrometallurgical Slag by Chlorination
Process and mechanism of strengthening chlorination cascade recovery of valuable metals from electroplating sludge. Journal of Cleaner Production 2022, ... Transactions of Nonferrous Metals Society of China 2022, 32 (8), ... Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process.
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