موقعك الحالي:صفحة رئيسية>المنتجات
2022年8月2日 Here we report an approach based on reduced graphene oxide (rGO) which provides an ultrahigh capacity and selective extraction of gold ions present in ppm concentrations (>1000 mg of gold per...
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2022年12月15日 The adsorbed Au ions can be easily desorbed by being treated with thiourea solution, giving rise that 0.98 mg of Au ions (total adsorbed gold is 0.99 mg)
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2022年8月3日 practical gold extraction process often requires good extraction selectivity to gold, so that separation of co-existing elements from the extracted gold can be avoided,
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2020年6月1日 In this work, a technology of stepwise thiourea leaching was proposed to extract gold and silver from refractory gold concentrate calcine, which is hopefully applied
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2020年12月1日 Eco-friendly and economical extraction of gold from a refractory gold ore in iodide solution using persulfate as the oxidant. Persulfate is a suitable oxidant for
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2021年11月23日 Xing et al. developed an integrated hydrometallurgical process consisting of leaching, solvent extraction and cementation to recover gold and silver from anode
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2023年4月3日 Gold mining from gold sources, such as natural ores, electronics, and other industrial wastes, is not yet feasible in terms of environmental costs and production
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2022年5月1日 Under the optimal leaching conditions of lixiviant concentration 0.3 wt%, initial pH 10–11, liquid to solid ratio 2.5:1, and agitation speed 600 rpm, the synthetic
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2019年9月11日 Alkaline sulfur-containing lixiviants, including thiosulfate, polysulfides, and alkaline sulfide solutions, stand out as a promising class of alternatives to cyanide
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2020年6月1日 1. Introduction. Gold, a critically important noble metal with high corrosion resistant and durability properties, could be used as strategic reserves and manufacture corrosion-resistant high precision product (Azadi et al., 2019; Wu et al., 2019).Leaching of gold ores by cyanide in aerated alkaline slurries has been the dominant process for more
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2022年8月5日 Abstract Of late, given the difficulties in gold extraction and severe environmental pollution emanating from cyanide extraction of Carlin-type gold concentrate (CTGC), a novel pressure oxidation pretreatment followed by sodium jarosite decomposition and fine grinding was first proposed to extract gold from the CTGC in a non-cyanide
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2022年2月1日 1. Introduction. Gold is a scarce strategic metal, which is widely used in gold jewelry, currency reserves, and high-tech industries (Seisko et al., 2020).It plays an irreplaceable role in national economic and social development (Yilmaz et al., 2020).According to US Geological Survey data, the amount of gold resources identified
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2021年11月12日 Therefore, the extraction of gold is increasing with the raising of temperature [8] 3.2 Effect of Agitation Speed . The effect of agitation speed on percentage extraction is studied under constant optimum pH 1, temperature at 35°C, and 1:1 ratio of organic to aqueous phase. The result is presented as in Figure
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2020年12月1日 1. Introduction. Cyanidation remains the main method for gold extraction in gold mines around the world because of its advantages of being a well-established process, strong adaptability, and easy process control (Asamoah, 2020; Nunan et al., 2017).Nevertheless, the dissolution rate of gold in cyanide solution is very slow
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2022年7月6日 The 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
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2016年12月2日 Gold is one of the precious metals that can be extracted from the e waste. The present work aim to extract gold from e waste by aqua regia solution based hydro metallurgy method which includes a ...
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1998年12月1日 This paper is a survey of the basic recovery methods and techniques used in extractive metallurgy of gold. Process fundamentals on mineral processing, ore leaching, zinc dust cementation ...
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2019年6月1日 The gold extraction rate for raw gold ore under optimum conditions (0.25 M potassium bromate, 0.08 M ferric chloride, 0.4 M hydrochloric acid, extraction time of 5 min, stirring speed of 250 rpm, and liquid-to-solid ratio of 5) was 94.5%. For a gold flotation concentrate, the gold extraction rate was as high as 91.8%.
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2019年7月9日 An alternative system to cyanide as a leaching agent is presented for the recovery of gold and silver from cyanicide minerals. These minerals are characterized by the presence of copper and carbonaceous minerals in their composition, therefore increasing both the consumption of reagents and energy requirements for the detoxification and
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2018年10月1日 Ionic liquid-based aqueous biphasic extraction is an environmentally benign technology for separation of various substances. In this study, aqueous biphasic systems (ABSs) consisting of 1-alkyl-3-methylimidazolium bromide ionic liquids (ILs) (alkyl = butyl, hexyl, and octyl) and phosphate-based salts were studied for extraction of gold(I)
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1984年1月1日 The most effective of these extractants are di-isopropyl ether (in the range 5.5–10 M nitric acid) and diethyl ether (4–10 M nitric acid). In both cases, maximum extraction is ca. 95% in a single pass. Salting-out agents (ammonium, magnesium and aluminum nitrates) have little effect on the extraction of gold (III) with di-isopropyl ether.
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Gold processing, preparation of the ore for use in various products. For thousands of years the word gold has connoted something of beauty or value. ... The mining of alluvial deposits and, later, lode or vein deposits
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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 large
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2021年5月15日 The selective separation of gold from this precious metal leachate was achieved by solvent extraction using 0.1 M tertiary amide extractant dissolved in toluene. This process delivers complete copper and gold recycling from WPCBs under relatively benign laboratory conditions and represents a proof of concept for liberating valuable and
Read More2015年2月1日 The leaching of gold and silver in a pH modified glycine solution in the presence of hydrogen peroxide was investigated. It was found that this lixiviant system can dissolve gold and/or silver under neutral and alkaline conditions at ambient to moderately elevated temperatures (23–60 °C). The gold leaching rate in solutions containing 0.5 M
Read More2004年4月1日 Gold extraction decreased to 87% when the NH 3 /NH 4 + concentration increased to 4.0 mol/L and decreased to 25% at 6.0 mol/L NH 3 /NH 4 +. The reason for the low gold extraction at high NH 3 /NH 4 + concentration is the same as that for copper ion. The higher the concentration of the positive ionic species is in the solution, the lower the ...
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2022年7月1日 The feasibility of hydrometallurgy for metal extraction from electronic wastes was investigated in the current work. Samples were ground and preliminary extracted by nitric acid and aqua regia. The gold concentrations in nitric acid and aqua regia were measured as 1.82 mg L 1 and 29.45 mg L 1, respectively.In addition, extraction
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大量翻译例句关于"extraction of gold" – 英中词典以及8百万条中文译文例句搜索。 翻译器 Translate texts with the world's best machine translation technology, developed by the creators of Linguee.
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The dissolution or extraction of gold from gold ore is an electrochemical reaction. Gold extraction generally involves two electrochemical reactions [8 ]: (2.7.16) (2.7.17) After the gold is dissolved, it is concentrated by carbon adsorption. Later, it is recovered from solution as metallic gold by electrolysis.
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الصين -تشنغ تشو -المنطقة الوطنية للتنمية الصناعية للتكنولوجيا المتطورة، جادة العلوم رقم 169.
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