The Application of Diagnostic Leaching to Copper and Gold …
Parkinson, G. A. and Bhappu, R. B., 1995, "The Sequential Copper Analysis Method – Geological, Mineralogical and Metallurgical Implications", SME Pre-print 95 ...
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Selective Separation and Recovery of Tellurium from Copper …
attained at 80 °C, using both cuprous ion and metallic copper. The cementation method employed has proven the possibil- ... critical to select the appropriate oxidant or leaching method in order to maximize tellurium and copper recovery while minimizing selenium or other minor impurities in the solu-tion. After the removal of copper, the ...
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Sequential bioreduction–bioleaching and bioreduction–chemical leaching
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 method ...
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Dissolution kinetics and solubilities of copper sulfides in cyanide …
Cyanide leaching applied in sequential extractions of porphyry copper tailings samples from the Piuquenes impoundment, La Andina, Chile, improved the selective dissolution of secondary sulfides compared to a previously proposed hydrogen peroxide dissolution method, thus allowing their differentiation from primary sulfide minerals.
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(PDF) Copper heap leaching: Process, principles and practical
The proposed method identifies the maximum dripper spacing that can be used before the width of the dripper spacing has a stronger effect on the diffusional path length than the increase in bulk ...
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Sequential Bioleaching of Pyritic Tailings and Ferric Leaching …
Ferric leaching of two types of slag at 70 C with the leachate obtained during bioleaching of the tailings and containing 15 g/L of Fe3+ allowed 88.9 and 43.4% recovery of copper and zinc, respectively, from copper slag within 150 min. Meanwhile, 91.5% of copper, 84.1% of nickel, and 70.2% of cobalt were extracted from copper–nickel slag within
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A Brief Note on the Heap Leaching Technologies for the Recovery …
Heap leaching is a low-cost technology used in industrial mining to recover precious metals such as gold and uranium, along with several other highly sought after metals like copper, from their primary resources (ores and minerals). For many decades, there has been a growing demand for heap leaching due to its environmental benefits. Heap leaching provides …
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How copper dump leaching works
The test samples contained between 0.33% and 0.35% soluble Cu, and between 0.36% and 0.38% total Cu. Soluble Cu is defined as that portion of copper that is extractable by sequential digestion in acid and cyanide (Lizama, 2017), and is understood to represent copper present as chalcocite.The balance of the copper content, also termed insoluble Cu, was …
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Sequential chemical extraction of copper from clay: an …
Materials and methodsSelective and sequential chemical leaching methods were both used to evaluate the speciation of Cr, Ni, As, Cd, Zn, and Pb in soil samples collected from New York City ...
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Speciation characterization of arsenic-bearing phase in arsenic …
Arsenic sulfide sludge (ASS) is a kind of deleterious waste which contains various valuable metallic elements, such as Re and Pb, which are always associated with arsenic-bearing phases in ASS. The leaching speed and efficiency of valuable elements may depend on the phase constitution. Here, we proposed a sequential leaching method to thoroughly understand …
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Selective Copper Recovery by Acid Leaching from Printed Circuit …
The most challenging issue associated with recycling the sludge generated from printed circuit boards (PCBs) is the separation of copper (Cu) from iron (Fe), using multi-stage leaching, or adding oxidizing and precipitating agents. Herein we investigated simple acid leaching to effectively extract copper and limit iron dissolution. Selective copper leaching was …
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Dissolution of copper from smelting slag by leaching in …
slag with sub sequential water leaching and flotation of the slag remained the two methods to which researchers most focused on copper extraction. Apart from copper, the copper smelter slag can also be a significant source of iron and silica [15-18]. The reverberatory furnace slag that was discarded in the vicinity of the Bor Copper Smelter ...
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(PDF) Sequential leaching of copper from mill tailings with …
International Journal of Engineering and Applied Sciences (IJEAS), 2017. Optimal parameters of leaching of non-ferrous and noble metals from mill tailing by solutions in the presence of oxidizing agents (paramagnetic catalyst) are investigated.The optimum concentration of sulfuric acid and sodium cyanide was determined in the leaching of gold-containing mill tailings.It is shown that …
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Lab scale optimization and two-step sequential bench scale …
Two-step sequential bench scale reactor leaching tests were conducted to extract copper (98.73%), gold (99.98%) and silver (96.90%) selectively with high extraction. Two-step leaching approach was concluded as the most appropriate method for selective extraction of targeted metals from waste RAM devices.
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STUDIES ON THE CURING AND LEACHING KINETICS OF …
Table 2.3 Copper oxide leaching reactions (Watlin 2006) ..... 14 Table 2.4 Copper sulfide leaching reactions (Watlin 2006) ..... 14 Table 2.5 Important gangue leaching reactions in copper heap leaching (Jansen and
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Procedure Residual Copper Soluble Analysis -Assay …
METHOD for SEQUENTIAL AND RESIDUAL COPPER ANALYSIS. PURPOSE: To determine, through sequential dissolution, the probable copper …
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THE GEOCHEMISTRY OF COPPER LEACHING
Due to the acid consumption-creation duality of copper heap leaching, the determination of acid consumption and the overall chemistry of the leaching process must be quantified by means of locked-cycle column and crib tests. This is also important in evaluating potential environmental impacts.
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SEPARATION OF INDIUM AND OTHER METAL VALUES …
pressure and in pressurized conditions, leaching with water, leaching with sulfurous acid, leaching with sodium hydroxide, and sequential leaching with a variety of lixiviants. It was determined that, due to the
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Determination of occurrence and leaching toxicity of arsenic in copper
The removal of readily soluble As and Cuâˆ'As intermetallics from smelting slag by flotation can reduce the As leaching toxicity of slag tailings, making them conform to the USEPA and SEPA regulatory thresholds for As. Key words: copper flash smelting; arsenic; copper slag; selective sequential extraction; leaching toxicity 1 Introduction ...
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Reactor and column leaching studies for extraction of copper …
A two step sequential percolation column leaching method involving chemical leaching followed by bioleaching has also been carried out to compare with that of reactor …
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(PDF) Copper Analysis by Two Different Procedures of Sequential
Sequential extraction procedures are considered appropriate to clear up the fractionation of toxic metals between different forms and have been successfully applied to tailing analysis [9].
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Copper Analysis by Two Different Procedures of Sequential …
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 …
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The Genesis and Spatial Distribution of Ore Mineral Species of …
Sequential leaching is an important procedure used as a diagnostic tool to establish the exact location of copper minerals (Parkison, 1995). The use of sequential data assays to classify mineral types was proved successful by Jacobs ( 2016 ), Beaumont ( 2016 ), and Beaumont and Musinguini ( 2019 ) at the Kansanshi Mine by using oxidation ratios.
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Speciation characterization of arsenic-bearing phase in arsenic …
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 4 ...
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Reliable determination of SiO2 concentrations in sediments via
Our study proposes a strategy for obtaining SiO 2 concentrations from a simple two-step sequential leaching method using a calibration method based on the consideration that the sum of all element concentrations expressed as oxides should be 100 % m/m for a given anhydrous and carbon-free silicate component. Five sediment reference materials ...
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Ultrasound assisted sodium-chlorate leaching of selenium from copper
Although these methods extract the target elements, the recovery process is always complex and accompanied by high costs. Lu et al. (2015) comprehensively improved the leaching efficiencies of copper, selenium, and tellurium by applying sequential alkali and acid leaching, but the acid–base conversion process is expensive.
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Study of Metal Speciation During the Sequential Leaching of …
B. Sequential leaching 100 grams was used for sequential leaching and 300ml of solution was used for each fraction reagent. All 3 samples were washed with De-ionized water to get soluble components when subjected to rainwater (Fraction 0). Tessiers standard methodology was followed for sequential extraction from
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Copper Analysis by Two Different Procedures of Sequential …
Abstract: 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 …
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Copper analysis
Methods for copper concentrates are available with upper detection limits of and a high degree of precision. ALS offers HNO 3 -HCl-HF-H 2 SO 4 digestion followed by measurement …
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