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The optimal leaching conditions were established as follows: 3.0 mol/L sodium hydroxide, 10 g/L sulfur, leaching temperature 95 °C, leaching time 2.0 h, liquid to solid ratio 6, and stirring ...
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One proven method for bulk limestones involves the removal of up to a third of the powdered sample using an acid pre-leach before partial dissolution of the rest of the sample using a weak acid or acid buffer solution. ... we apply sequential leaching to constrain the possible effects of different REE-bearing phases on measured carbonate …
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The specific colorimetric method determined for each leaching matrix is described. The needed equipment is inexpensive and the work can be done by every laboratory that is able to measure dissolved P colorimetrically. ... However, sequential extraction and selective leaching of particles to extract P from target phases is labor …
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2 Material and Methods 2.1 Materials. LIB black mass samples were provided by RMF (Freiberg, Germany). The recycling process depicted in Fig. 1 had previously been developed and optimized for obtaining Li 2 CO 3 by the COOL-process 2.In the present work, the starting material is the solid residue obtained after the COOL …
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The analysis highlights the low abundances of copper minerals in the head sample. With the exception of chalcopyrite and "copper other" (unclassified, mixed X-ray spectra that contain any amount of copper), the copper minerals and many other minerals of interest for interpretation of the leach performance in this sample are present at less …
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A new approach was suggested to treat flue dusts formed during secondary copper smelting, with the aim of maximizing metals recovery and minimizing generated residues. The method developed for processing the flue dust comprises several steps: • Leaching of dusts using a 5 M NaOH solution at 100 g/L S/L ratio and at 80 °C for about …
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The chemical speciation of potentially toxic elements (As, Cd, Cu, Pb, and Zn) in the contaminated soils and sulfides-rich tailings sediments of an abandoned tungsten mine in Korea was evaluated by conducting modified BCR sequential extraction tests. Kinetic and static batch leaching tests were also conducted to evaluate the potential …
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The composition of copper ore samples was analyzed with the use of fluorescence and chemical methods. Table 1 shows the content of the main valuable component—copper—as well as metals with the highest content that affect the leaching process. Table 1. Amount of copper and other metals in copper ore samples (%).
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A sequential citric + oxalic acid leaching method could represent a viable alternative for the dissolution of metals from lateritic nickel ore. Keywords: laterite; leaching; citric acid; oxalic ...
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The analysis of Cu distribution in pre-treated mine tailings after electrodialytic remediation was carried out by using two methods of sequential extraction. The initial content of copper in the tailings was 1109 mg Cu/kg of dry tailing, where close to 40% of the sample in weight corresponded to a soluble fraction. The …
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2. Bioleaching Process. Bioleaching—as opposed to traditional (heap) leaching—has become an attractive alternative in recent decades due to its potential in mineral leaching on a laboratory scale and, mainly, due to its industrial applications [].The industrial operation applied to the leaching of copper sulfides considers the formation of …
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Materials and methods. The three-step sequential extraction BCR method was used to analyse samples from mine tailing and uncontaminated soils. The correlations of the Zn and Pb contents in the three BCR steps with the total concentrations of both trace elements in soils and plants and with the soil characteristics were determined.
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The global process is characterized as "sequential" since a preliminary acid leaching is performed for ferrous iron extraction from the BPP material before the copper bioleaching itself. Prior to bioleaching experiments, resistance to dissolved copper has been quantified at various concentrations to assess a potential protective effect of ...
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concentration, solid-to-liquid ratio, agitation speed, particle size, and temperature were assessed on the leaching fraction of copper. The ndings showed that the leaching rate is nearly independent of the agitation rate at the high values of 300 rpm. The recovery of copper strongly promoted from 2 to 90% by increasing sulfuric acid ...
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Selenium was effectively enriched by approximately 200 % after first compound leaching. Sulfate roasting method was used to selectively separate selenium in the second stage. ... The copper anode slime leaching experiments were conducted in 250 mL round-bottom flasks. ... Chlorination Sequential Extraction of Antimony from Copper …
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Metallic screen method Cu-SCR21. Metallic screen analysis is recommended for samples that contain native copper as the native copper may not be homogenously distributed through a prepared sample. Samples are screened, a portion of the material passing through the screen is analysed and the entire portion of the material remaining is assayed.
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The Sequential Copper Analysis Method-Geological, Mineralogical and Metallurgical Implications. Jan 1995; ... "Optimizing Copper Leaching/SX-EW Operations with Mineralogical Data", SME Annual ...
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In view of the above, a fundamental two step sequential leaching method involving both bioreduction and biooxidation principles have been proposed in the present study for enhanced copper recovery. In addition to the above, a direct comparison has also been made for the recovery of copper using a hybrid bioreduction–chemical leaching …
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Two-stage sequential leaching experiments. A two-stage sequential leaching process was then proposed to recover base (Cu, Pb, and Sn) and precious metals (Au, Ag, and Pd) from waste motherboards' PCBs. Experimental designs were used to screen the effect of parameters on the leaching of metals in both stages and to optimize the first stage.
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The copper content in the original tailing was 1109 of Cu/kg dry tailing, humidity of 0.7% and pH of 3.9. The sequential extraction analysis was carried out for the initial sample; the concentrations of copper associated to each fraction in mg of Cu/kg of dry tailing are presented in Table 1. The composition of tailings shown 40% of total ...
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The phase of copper slag is more intricate compared to natural copper minerals and waste circuit boards, as the copper-containing components are intricately mixed with other gangue materials. When the leaching method is used to recover copper from copper slag, it is necessary to pay attention to the possible consumption of …
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Here, we proposed a sequential leaching method to thoroughly understand the constitution of arsenic-bearing phase and the distribution of valuable elements in ASS. The results show that five major arsenic-bearing phases exist in ASS: amorphous As 2 S 3, crystalline As 4 S 4, As 2 O 3, and As atoms dissolved into the lattice of PbS and PbSO …
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For selective leaching and highly effective recovery of heavy metals from a metallurgical sludge, a two-step leaching method was designed based on the distribution analysis of the chemical fractions of the loaded heavy metal. Hydrochloric acid (HCl) was used as a leaching agent in the first step to leach the relatively labile heavy metals and …
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This paper considers the issue of recycling of waste printed circuit boards (WPCBs) containing precious and base metals in appreciable amounts. High-pressure oxidative leaching (HPOL) with dilute sulfuric acid resulted in removal of a significant amount of base metals from a WPCB ash sample obtained by incineration at 800°C. The …
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It can be seen from Eq. () that the higher the Fe 3+ concentration, that is, the higher the redox potential, the higher the leaching rate of chalcopyrite.Hirato et al. [] testified that the leaching of chalcopyrite showed parabolic-like kinetics initially and then showed linear kinetics, and that Fe 3+ influenced the leaching rate of copper and the …
DetailsSelective copper leaching was achieved with all the acids studied, including HCl, HNO3, and H2SO4. The lower concentration of acid solutions resulted in a larger difference in leachabilities between Cu and Fe. Among three leachates, the H 2SO4 solution performed effectively on the selective leaching of Cu and Fe. Adjusting the pulp density to
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Extraction of copper from suitable ore by leaching methods is generally assumed to cost less than the combined expense of concentration, smelting, and refining, and experimental data tend to confirm this opinion. At the Butte-Duluth plant, which is handling in excess of 100 tons of oxidized ore daily, the copper is said to cost $0.085 per …
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The efficient particle size for leaching of copper in Zhu et al. studies was about 0.18–0.25 mm. As it is shown in Figure 2, Cu and Pb dissolution percentages increase by decreasing the particle size due to higher available reactive surface. The efficient particle size fraction for the leaching of copper and lead falls at 0.15 to 0.4 mm.
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Although there are some studies which focus on the selective recovery of metals by sequential leaching ... and the mass ratio of the cuprous sulfide to scrap copper was 10%. A novel method was ...
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A selective acid leaching process was then used to recover the copper content of the residue after filtration. In the second stage, an additional 1 N of sulphuric acid was added to the suspension in the selective leaching process, and the pH value was controlled at 1.5-2.0. The reagent sodium hydroxide (2 N) was used as leachate at a pH greater ...
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proper leaching route, the precipitation of tellurium using metallic copper and cuprous ions has been investigated. The main objective of the suggested recovery process in this study was to develop a simple and closed-circuit process that both generates minimum wastes and consumes waste effluents of a copper plant and produce a critical ...
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The form in which a metal exists strongly influences its mobility and thus, the effects on the environment. Operational methods of speciation analysis, such as the use of sequential extraction procedures, are commonly applied. The Dongting Lake, the second largest fresh-water lake in China, contains three China wetlands of international importance, the East …
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The dissolution behavior of Caldag lateritic nickel ore subjected to a sequential organic acid leaching method was investigated. The effects of the type of organic acid, acid concentration ...
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Materials and methods ... Sequential leaching of sandstone and black shale kupferschiefer fractions. ... Acid leaching produces copper-containing PLS, but the large amounts of sulfuric acid required to solubilize carbonate minerals would probably exceed the value of the copper extracted. More efficient copper extraction would be achieved …
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