The present study reports a sequential, non-acid process for effective recovery of copper and precious metals from mobile phone printed circuit boards. In this process, gold and silver were first enriched during the synthesis process of cuprous chloride and then leached by thiosulfate method. Result …
Gold recovery methods. Following leaching, gold ions remain dissolved in the solution, together with other elements. It is necessary to recover gold ions from this solution, separating them from the other dissolved metals present. ... Sequential recovery of gold and copper from bioleached wastewater using ion exchange resins. Environ. …
The first step in this method is preparing the discarded end-of-life PCBs for treatment, followed by leaching, separation, and purification processes [13]. One commonly used method for separating base metals involves using aqueous acids like sulfuric or hydrochloric acid for leaching experiments.
The study of copper (Cu) recovery is crucial for the entire recovery process of waste printed circuit boards (WPCBs), and Cu can be leached efficiently via a sulfuric …
Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals. New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching …
A widely used method for exploiting secondary sulphide copper deposits involve leaching the ore in heaps or dumps. In both instances, ore piles are irrigated …
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 …
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 …
Based on the Eh–pH diagram for the Se–H2O system, a new method is proposed for leaching selenium from copper anode slimes using a nitric acid–sulfuric acid mixture. The effects of solid/liquid ratio, HNO3 and H2SO4 concentrations, leaching temperature, and reaction time on the leaching efficiency of selenium were investigated. …
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 ...
Figure 2.11 Typical permanent heap leach operation for low grade copper oxides and secondary sulfides with minor amounts of primary copper sulfides ..... 23 Figure 3.1 Acid …
2.2. Acid leaching and recovery of metals. Early studies on recycling of spent batteries focused on optimizing the leaching conditions through orthogonal experimental design or single factor tests to achieve the highest leaching efficiency [2].In the present work, the experimental parameters, including species and concentrations of leachants …
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 ...
Leaching methods Batch test. The test of heavy metals leaching from waste materials was performed according to the procedure based on the standard EN 12457-2:2002 8.The required grain size of ...
Subsequently, in Hoseinian et al. a mathematical modeling method is used to predict the optimum leaching conditions in copper oxide mineral columns by investigating the effects of variables such as …
The present study reports a sequential, non-acid process for effective recovery of copper and precious metals from mobile phone printed circuit boards. In this …
Valuable metals in smelting sludge from smelting industry have a recovery value. In this work, for realizing waste recycling effectively, selective and multi-step leaching of valuable metals was investigated with scrap copper-smelting sludge as research object. The effect of the concentration of sulphuric acid on leaching rates of …
Sequential leaching (dilute sulfuric acid followed by cyanide-aqua regia leach) was carried out by external commercial laboratories on the calibration samples from Sites B and C.
An effective method for sequential recovery of copper and precious metals (Ag, Au) without using corrosive acids or strong oxidants was developed. In the process, gold and silver were enriched during copper recovery process. ... The great difference may be attributed to the dissolution of copper during the leaching process of the raw PCBs. …
Coppermaking from sulfide concentrates entails two major steps: smelting and converting. In continuous direct-to-copper smelting process these two steps are combined into one. The principal advantages of this process are: isolation of SO2 emission to a single, continuous, SO2-rich gas stream, minimization of energy consumption and …
Semantic Scholar extracted view of "Comparison of three-stage sequential extraction and toxicity characteristic leaching tests to evaluate metal mobility in mining wastes" by E. Marguí et al. ... the effects on the environment. Operational methods of speciation analysis, such as the use of sequential extraction … Expand. 26. Highly Influenced.
This paper outlines the basic methodology of diagnostic leaching applied to copper and gold ores. Also, examples of …
LIU Wei-feng, FU Xin-xin, YANG Tian-zu, et al. Oxidation leaching of copper smelting dust by controlling potential [J]. ... YU Hong-fa, ZHANG Hui-fang. Extraction of aluminum by pressure acid-leaching method from coal fly ash [J]. ... of computer modelling to predict the leaching behaviour of heavy metals from MSWI fly …
The Sequential Copper Analysis Method-Geological, Mineralogical and Metallurgical Implications. Jan 1995; ... "Optimizing Copper Leaching/SX-EW Operations with Mineralogical Data", SME Annual ...
Copper foil was employed as a working electrode for cobalt and nickel deposition; the electrodes were prepared by cutting the copper foil (thickness 0.25 mm, 99.98% trace metals basis, Sigma ...
DOI: 10.1016/J.GEODERMA.2014.04.011 Corpus ID: 129886197; Sequential extraction of heavy metals in soils from a copper mine: Distribution in geochemical fractions @article{ArenasLago2014SequentialEO, title={Sequential extraction of heavy metals in soils from a copper mine: Distribution in geochemical fractions}, author={Daniel Arenas …
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 achieved with all the acids studied, including HCl, HNO3, and H2SO4 ...
Heap leaching of copper oxides and transition ores and acid/neutral leaching of zinc calcine are well-established processes to generate the feed ... LiNi x Co y Mn 1-x-y O 2 can be dissolved with a leaching efficiency of 70% by acid leaching. This method is convenient and exhibits low complexity, although the potential environmental hazards ...
The average values of cumulative release concentrations from NSCs, CSCs, and ZSCs in the sequential leaching experiments with three extraction solutions were 1.44 mg/kg, 315.49 mg/kg, and 1483.19 mg/kg, respectively, higher than those in the column leaching experiments, but the metal concentration from LZSS in the column leaching …
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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نشانی: شماره 1688، جاده شرقی گاوک، منطقه جدید پودونگ، شانگهای، چین.
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