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Relevant bibliographies by topics / Chrysocolla. Copper ores Leaching

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Academic literature on the topic 'Chrysocolla. Copper ores Leaching'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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Journal articles on the topic "Chrysocolla. Copper ores Leaching"

1

Pérez, Kevin, Norman Toro, Eduardo Campos, et al. "Extraction of Mn from Black Copper Using Iron Oxides from Tailings and Fe2+ as Reducing Agents in Acid Medium." Metals 9, no. 10 (2019): 1112. http://dx.doi.org/10.3390/met9101112.

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Exotic type deposits include several species of minerals, such as atacamite, chrysocolla, copper pitch, and copper wad. Among these, copper pitch and copper wad have considerable concentrations of manganese. However, their non-crystalline and amorphous structure makes it challenging to recover the elements of interest (like Cu or Mn) by conventional hydrometallurgical methods. For this reason, black copper ores are generally not incorporated into the extraction circuits or left unprocessed, whether in stock, leach pads, or waste. Therefore, to dilute MnO2, the use of reducing agents is essenti

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2

Gijsemans, Lukas, Joris Roosen, Sofía Riaño, Peter Tom Jones, and Koen Binnemans. "Ammoniacal Solvoleaching of Copper from High-Grade Chrysocolla." Journal of Sustainable Metallurgy 6, no. 4 (2020): 589–98. http://dx.doi.org/10.1007/s40831-020-00294-3.

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AbstractThe copper silicate ore chrysocolla forms a large potential copper resource, which has not yet been fully exploited, due to difficulties associated with its beneficiation by flotation and metallurgical processing. Direct acid leaching of chrysocolla causes silica gel formation. Therefore, in this work, the feasibility of solvometallurgical methods to leach copper from high-grade chrysocolla while avoiding issues with silica gel formation was assessed. Ammoniacal solvoleaching was performed with a solvent comprising the chelating extractant LIX 984 N or the acidic extractant Versatic ac

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3

Quezada, Víctor, Oscar Benavente, Cristopher Beltrán, Danny Díaz, Evelyn Melo, and Antonio García. "Dissolution of Black Copper Oxides from a Leaching Residue." Metals 10, no. 8 (2020): 1012. http://dx.doi.org/10.3390/met10081012.

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This article presents the behavior of black copper minerals in reducing acid leaching using FeSO4 as reducing agent. The original sample, which was a blend of green and black copper minerals, was treated first by an oxidizing acid leach using O3 to dissolve the soluble phase (green copper oxides). The residue (mainly black copper) was evaluated by agitated leaching under three different solution potentials, with respect to the standard hydrogen electrode (SHE) (450, 500, and 600 mV (SHE)) at 25 °C. The original sample and the leach residue were characterized by scanning electron microscope (SE

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4

Blinov, I. A. "Minerals of oxidation zone of the Elenovskoe copper porphyry deposit, South Urals." МИНЕРАЛОГИЯ (MINERALOGY) 5 (July 16, 2019): 37–48. http://dx.doi.org/10.35597/2313-545x-2019-5-2-37-48.

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Samples of oxidation zone of the Elenovskoe Cu porphyry deposit are studied using optical and scanning electronic microscopy. In addition to Fe hydroxides and abundant malachite, the supergene mineral assemblage includes native Cu and Au, Ag-containing covellite, cuprite, tenorite, plumbogummite, goyazite, iodargyrite, atacamite, and chrysocolla. The oxidized ores contains pyrite relics and high amount of tourmaline (dravite). Some dravite grains contain Cu.

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5

Zhang, Tie Min, Zhi Cong Wei, and Ying Bo Mao. "Ammonia Leaching Study on Refractory Oxidised Copper Ores." Applied Mechanics and Materials 563 (May 2014): 53–56. http://dx.doi.org/10.4028/www.scientific.net/amm.563.53.

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Ammonia leaching research is carried out on a certain oxidised copper ores. The effects of oxidized copper ores which came from Yunnan Province were studied in laboratory in order to find out the optimum leaching conditions under normal temperature and pressure. The ores belonged to typical high binding rate minerals. The optimum conditions obtained were as follows: granding fineness about 90% -0.074mm, ammonia concentration 2 mol/l, ammonium fluoride concentration 1.5mol/l , leaching time 2h, and liquid-solid ratio 3:1.The leaching rate of this ore could reach 86%.

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6

NAKAMURA, Hidekatsu, Muneyuki TAMURA, Tadashi CHIDA, and Naoki SATO. "Acceleration of Copper Leaching of Secondary Copper Sulfide Ores." Journal of MMIJ 126, no. 6 (2010): 184–89. http://dx.doi.org/10.2473/journalofmmij.126.184.

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7

Araya, Giselle, Norman Toro, Jonathan Castillo, et al. "Leaching of Oxide Copper Ores by Addition of Weak Acid from Copper Smelters." Metals 10, no. 5 (2020): 627. http://dx.doi.org/10.3390/met10050627.

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In this study, weak acid in the curing and leaching stages of copper ore was incorporated, and we analyzed its effect on the dissolution of copper and final impurities. The weak acid corresponds to a wastewater effluent from sulfuric acid plants produced in the gas treatment of copper smelting processes. This effluent is basically water with high acidity (pH-value low at 1), which contains several toxic elements and some valuable metals. The results indicated that there is no positive or negative effect on the incorporation of the weak acid in the curing stage, while the case of the leaching s

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8

Mubarak, Yousef. "Leaching of Copper Ores: Effects of Operating Variables." International Journal of Emerging Trends in Engineering Research 8, no. 8 (2020): 4226–35. http://dx.doi.org/10.30534/ijeter/2020/31882020.

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9

Boboev, I. R., Sh Bobozoda, and L. S. Strizhko. "Leaching Stubborn Oxidized Gold Ores That Contain Copper." Metallurgist 59, no. 9-10 (2016): 959–63. http://dx.doi.org/10.1007/s11015-016-0200-3.

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10

Wu, Ai Xiang, Bao Hua Yang, Jin Zhi Liu, and Xiu Xiu Miao. "Effect of Bio-Leaching Process on the Pore Structure of Packed Particle Bed via 3D Imaging and Analysis." Advanced Materials Research 825 (October 2013): 344–47. http://dx.doi.org/10.4028/www.scientific.net/amr.825.344.

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Heap bio-leaching technology is extensively applied to recover metals from low-grade complex ores in the mining industry, particularly the copper sulfide ores. Understanding the effect of bio-leaching process on the pore structure of packed particle beds is important to enhance the percolation and leaching performances with respect to design and operation of heap leaching system. The porosity, pore size distribution and degree of pore connectivity are the three most important features correlated with fluid flow in heap leaching operation. In this study, a spiral X-ray CT scanner, combined with

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Dissertations / Theses on the topic "Chrysocolla. Copper ores Leaching"

1

Jiang, Mofen. "The Chemical and kinetic mechanism for leaching of chrysocolla by sulfuric acid." Thesis, The University of Arizona, 1992. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1992_610_sip1_w.pdf&type=application/pdf.

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2

Crane, Martin John. "Geochemical studies of selected base metal minerals from supergene zone /." View thesis, 2001. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030721.132607/index.html.

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Thesis (PhD) -- University of Western Sdyney, 2001.<br>"A thesis presented in accordance with the regulations governing the award of the degree of Doctor of Philosophy, University of Western Sydney" "November 2001" Bibliography: leaves 249 - 254.

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3

Seifelnassr, A. A. S. "Bacterial aided percolation leaching of copper sulphide ores." Thesis, Bucks New University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234445.

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4

Sainath, Narayana Rangaiah 1968. "Dynamic behavior of flow during leaching of copper ores." Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/291737.

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The objective of this investigation was to experimentally determine the variation in the flow characteristics of tactite copper ores during the leaching process. The laboratory work involved estimation of porosity and permeability of cores before leaching, and after various intervals of leaching. The tests were carried out using specimens of diameter 1.5 and 4.0 inches, prepared from boulders obtained from the Cyprus Casa Grande mine. A solution containing about 25 grams of sulfuric acid per liter was used as the lixiviant. Porosity was determined using the water saturation method. The permeab

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5

Barriga, Vilca Abrahan. "Studies on the curing and leaching kinetics of mixed copper ores." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44500.

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Heap leaching is a metal extraction process from low grade ores where crushed ore is stacked on an impermeable pad and irrigated from the top with a solution of chemical reagents. An enriched solution containing the targeted metal is collected at the bottom. This technique involves complex chemical/electrochemical reactions and transport processes. Among the main features of this method of extraction include low capital and operative cost, modularity, and relatively high inventory of solutions. The need to optimize a heap operation has led to research studies in order to understand and interp

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6

Shah, Kush. "The use of surfactants to aid and improve the leaching of low grade copper ores." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61802.

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Copper heap leach operations often suffer from reduced efficiency due to long leach times and variable recoveries. Surfactants have been considered as an option in increasing the leachability of ores. Improvements in overall copper extraction have been noted with their use, though testing has only been conducted on a limited scale. The molecular function of surfactants in heap leaching has not been extensively studied and is not well explored. The work in this thesis was aimed at better understanding and characterizing the function of the surfactants. Work was performed with surfactants develo

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Crane, Martin John, University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "Geochemical studies of selected base metal minerals from the supergene zone." THESIS_CSTE_SFH_Crane_M.xml, 2001. http://handle.uws.edu.au:8081/1959.7/232.

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Acid leaching of different natural chrysocolla samples under ambient conditions demonstrated that the chemical and chrystallographic inhomogenity significantly affects the rate and that it is virtually impossible to use the mineral as a model for the kinetics of hydrometallurgical processing of copper ores.Dissolution experiments, stability diagrams,and X-ray powder diffraction studies are undertaken and studied in this research and results are given.It is found that a complete solid solution series exists in Nature with most tungstenian wulfenites and molybdenum stolzites containing a range o

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Amos, Idzi Ambo. "Chemical investigation of leaching and electrochemical behaviour of sensor-based pre-concentrated copper ores with alkaline lixiviant." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/20849.

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While the production of copper metal from primary ores is still increasing, the gradual depletion of high-grade ores implies that the recovery of the metal from low-grade ores is presenting a challenge. A major problem associated with processing of low-grade copper ores can be their high calcite content and concentration of other metals such as Fe, Mn, Co, As, Pb, and Ni. These other metals make the processing of such ores expensive due to the high cost of the leaching chemicals. Therefore, in this study a novel, integrated copper processing method is developed to enhance the economic extracti

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9

Molleman, Ellen. "The treatment of copper-gold ores by ammonium thiosulfate leaching." Thesis, 1998. http://hdl.handle.net/2429/8356.

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The application of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide minerals chalcopyrite and enargite seem to be unreactive toward an ammonium thiosulfate leach. Covellite and chalcocite leach to a slight extent in this leaching system. The copper extractions of the sulfid

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10

Van, der Merwe Ryno. "Leaching characteristics of copper refractory ore : effect of pre-oxidation stage." Thesis, 2010. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000303.

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M. Tech. Metallurgical Engineering.<br>A novel process of leaching copper refractory ore from Nchanga mine, Zambia, in two stages consisting of a pre-oxidation step and an acid dissolution stage was investigated by means of a leach test rig.

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Books on the topic "Chrysocolla. Copper ores Leaching"

1

Rickard, Forrest R. Exploring, mining, leaching, and concentrating of copper ores as related to the development of Ajo, Arizona (to mid-year 1942). F.R. Rickard, 1996.

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2

Haldeman, Robert M. Managing copper mines in Chile: Braden, Codelco, Minerc, Pudahuel ; Developing controlled bacterial leaching of copper from sulfide ores : 1941-1993. 1995.

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3

Byers, C. H. Economic and energy evaluation of the replacement of conventional technology with continuous chromatography in the dump leaching of copper ores. U. S. Dept. of Energy., 1989.

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Reports on the topic "Chrysocolla. Copper ores Leaching"

1

Byers, C. H., J. M. Begovich, and J. M. Holmes. An economic and energy evaluation of the replacement of conventional technology with continuous chromatography in the dump leaching of copper ores. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/6111296.

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