Relevant bibliographies by topics / Copper ores – Zambia – Analysis

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Academic literature on the topic 'Copper ores – Zambia – Analysis'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Copper ores – Zambia – Analysis"

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Liang, Yi Li, Hua Qun Yin, Yun Hua Xiao, Min Tang, Xue Feng, Zhi Yong Xie, Guan Zhou Qiu, and Xue Duan Liu. "Microbial Leaching of Copper from Tailings of Low Grade Sulphide Ores in Zambia." Advanced Materials Research 1130 (November 2015): 473–76. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.473.

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Demand for copper is growing in the world,which makes it increasingly necessary to process low-grade ores and tailings that used to be considered as wastes. The development and application of bioleaching by acidophilic chemolithotrophic microorganisms, which obtain energy from the oxidation of sulfide minerals and use carbon dioxide for constructive metabolism, has been a major approach for processing the low-grade copper ores. In this study, mixed culture consisted of six iron and sulfur oxidizing microorganisms were used in leaching of flotation and acid-leaching tailings obtained from Zambia sulfide ores. The result showed that 62.7% and 61.7% copper were dissolved by bioleaching, while 53.8% and 57.4% by acid leaching in flotation and acid leaching tailings, respectively. In addition, mineralogical forms of copper were quite noteworthy since copper sulfide mineral extraction was significantly improved in bioleaching. XRD analysis showed wollastonite and diopside in acid tailing were undetectable after 23 days while others were difficult to be dissolved. No jarosite or sulphur was detected by XRD in residues.
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Ngom, Baba, Yili Liang, and Xueduan Liu. "Cross-Comparison of Leaching Strains Isolated from Two Different Regions: Chambishi and Dexing Copper Mines." BioMed Research International 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/787034.

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A cross-comparison of six strains isolated from two different regions, Chambishi copper mine (Zambia, Africa) and Dexing copper mine (China, Asia), was conducted to study the leaching efficiency of low grade copper ores. The strains belong to the three major species often encountered in bioleaching of copper sulfide ores under mesophilic conditions:Acidithiobacillus ferrooxidans,Acidithiobacillus thiooxidans, andLeptospirillum ferriphilum. Prior to their study in bioleaching, the different strains were characterized and compared at physiological level. The results revealed that, except for copper tolerance, strains within species presented almost similar physiological traits with slight advantages of Chambishi strains. However, in terms of leaching efficiency, native strains always achieved higher cell density and greater iron and copper extraction rates than the foreign microorganisms. In addition, microbial community analysis revealed that the different mixed cultures shared almost the same profile, andAt. ferrooxidansstrains always outcompeted the other strains.
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Sun, Jia Lin, Ba Ba Ngom, Yi Liu, Hua Qun Yin, Yi Li Liang, Xue Duan Liu, and Jing He Zhu. "Comparison of Indigenous and Exogenous Mesophilic Bacteria for the Bioleaching of Low Grade Copper Ores." Advanced Materials Research 825 (October 2013): 58–61. http://dx.doi.org/10.4028/www.scientific.net/amr.825.58.

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Using indigenous microorganisms in biomining processes assures few ecological distortions and less time consumption for adaptation. However, there is a debate as to whether an indigenous microbial community is more efficient than one composed of microbial strains selected for specific physiological traits. In order to provide thoughtful opinions in such a debate, a cross-comparison of six strains isolated from two different regions: Chambishi Copper Mine (Zambia) and Dexing Copper Mine (China), was conducted. Physiological properties and leaching performancesof Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptospirillum ferriphilum in pure and mixed culture were studied. The results showed that strains within species presented similar traits while copper resistance was not species-specific. In terms of leaching efficiency, native strains always achieved higher cell density and greater iron and copper extraction rates than the exogenous. In addition, microbial community analysis revealed the different mixed culture shared almost the same profile, and At. ferrooxidans strains always outcompeted the other strains.
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HAJHUSSEIN, A. "Ultraviolet spectrophotometric determination of copper in copper ores by flow-injection analysis." Talanta 43, no. 11 (November 1996): 1909–14. http://dx.doi.org/10.1016/0039-9140(96)01968-6.

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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 3D imaging and analysis, was used to characterize the complex pore structure of the packed ore particle beds before and after bioleaching copper sulfide ores. The results indicate that the pore structure has temporal and spatial variations during bio-leaching process.
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Tanaka, Yoshiyuki, Hajime Miki, Gde Suyantara, Yuji Aoki, and Tsuyoshi Hirajima. "Mineralogical Prediction on the Flotation Behavior of Copper and Molybdenum Minerals from Blended Cu–Mo Ores in Seawater." Minerals 11, no. 8 (August 11, 2021): 869. http://dx.doi.org/10.3390/min11080869.

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The copper ore in Chilean copper porphyry deposits is often associated with molybdenum minerals. This copper–molybdenum (Cu–Mo) sulfide ore is generally mined from various locations in the mining site; thus, the mineral composition, oxidation degree, mineral particle size, and grade vary. Therefore, in the mining operation, it is common to blend the ores mined from various spots and then process them using flotation. In this study, the floatability of five types of Cu–Mo ores and the blending of these ores in seawater was investigated. The oxidation degree of these Cu–Mo ores was evaluated, and the correlation between flotation recovery and oxidation degree is presented. Furthermore, the flotation kinetics of each Cu–Mo ore were calculated based on a mineralogical analysis using mineral liberation analysis (MLA). A mineralogical prediction model was proposed to estimate the flotation behavior of blended Cu–Mo ore as a function of the flotation behavior of each Cu–Mo ore. The flotation results show that the recovery of copper and molybdenum decreased with the increasing copper oxidization degree. In addition, the recovery of blended ore can be predicted via the flotation rate equation, using the maximum recovery (Rmax) and flotation rate coefficient (k) determined from the flotation rate analysis of each ore before blending. It was found that Rmax and k of the respective minerals slightly decreased with increasing the degree of copper oxidation. Moreover, Rmax varied greatly depending on the mineral species. The total copper and molybdenum recovery were strongly affected by the degree of copper oxidation as the mineral fraction in the ore varied greatly depending upon the degree of oxidation.
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Shang, He, Biao Wu, Jian Kang Wen, and Xing Lan Cui. "Analysis of Microbial Community in Heap Bioleaching of Low-Grade Copper Sulfide Ores." Key Engineering Materials 777 (August 2018): 277–81. http://dx.doi.org/10.4028/www.scientific.net/kem.777.277.

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High-throughput sequencing technology also known as "next generation" sequencing technology, compared with the traditional sequencing method has the characteristics of fast speed, high flux, low cost. In recent years the technology in the detection of microbial diversity has been fully applied. In this study, the microbial community of ore heap in different area and different depth was studied by using this method. The results showed the bio - heap leaching of low - grade secondary copper sulfide ore in Zijinshan from China could effectively recover the copper in the ore. The number of microorganisms in the center was significantly larger than that on the edge of ore heap, and as the depth increases in the heap, the number of microorganisms decreases. The dominant bacteria in the ore heap center was Acidithiobacillus ferrooxidans, in addition there were also some Sulfobacillus thermosulfidooxidans, Ferroplasma cupricumulans, Acidithiobacillus caldus and a small amount of Leptospirillum ferriphilum in the center of the ore heap. Unlike the ore heap center, Sulfobacillus thermosulfidooxidans was the main species on the edge of the ore heap, moreover Acidithiobacillus ferrooxidans, Ferroplasma cupricumulans, Acidithiobacillus caldus and a small amount of Leptospirillum ferriphilum were found on the edge of the ore heap. In addition, some heterotrophic bacteria such as Pseudomonas, Serratia, Sediminibacterium, Stenotrophomonas, Brevundimonas and Variovorax were found both in the center and the edge of the sample, these heterotrophic bacteria may be beneficial for the leaching of valuable metals.
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Wang, jianguo, wen Zhang, Yifan Zhang, Faming Tian, Yunying Duan, and Wenyu Sun. "Analysis on the geochemical characteristics of Chachalongwa copper, lead and zinc polymetallic ores." IOP Conference Series: Earth and Environmental Science 199 (December 19, 2018): 042043. http://dx.doi.org/10.1088/1755-1315/199/4/042043.

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HUELGA-SUAREZ, G., M. MOLDOVAN, M. SUÁREZ FERNÁNDEZ, M. ÁNGEL DE BLAS CORTINA, F. VANHAECKE, and J. I. GARCÍA ALONSO. "LEAD ISOTOPIC ANALYSIS OF COPPER ORES FROM THE SIERRA EL ARAMO (ASTURIAS, SPAIN)*." Archaeometry 54, no. 4 (August 31, 2011): 685–97. http://dx.doi.org/10.1111/j.1475-4754.2011.00635.x.

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Kamradt, Andreas, Juliane Schaefer, Axel Schippers, and Sabrina Hedrich. "Comparative Bioleaching and Mineralogical Characterization of Black Shale-Hosted Ores and Corresponding Flotation Concentrates." Solid State Phenomena 262 (August 2017): 139–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.139.

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In this study, two black shale copper ores from different Mid-European Kupferschiefer-type deposits and their flotation concentrates were used for bioleaching tests. All samples were subjected to stirred tank bioleaching using an acidophilic, moderately thermophilic microbial consortium. The distribution of sulfides and gangue minerals in the ores, copper concentrates and residues of both, bioleaching and sterile chemical control tests were investigated using EDX-based particle analysis. The black shale ores and the extracted copper concentrates varied in their mineralogical composition with respect to the distribution of sulfides and gangue. While the copper-bearing sulfides in the Sangerhausen black shale and concentrate were dominated by bornite and chalcopyrite, the Rudna black shale and its flotation concentrate were rich in chalcocite and bornite. Differences in the portion of gangue minerals were detected in particular for carbonates that represented the dominant mineral group in the Rudna black shale and its copper concentrate. Distinct Cu dissolution kinetics and recovery rates of Co and other associated metals were observed for the various materials processed by bioleaching. Copper sulfides were completely dissolved also in both black shale ores. However, the sulfide distribution in the bioleaching residues of the Sangerhausen concentrate revealed that a significant portion of chalcopyrite was not leached. Even higher recovery rates for copper and other metals were determined for the bioleaching tests on the Rudna concentrate, in which copper sulfides were nearly completely dissolved. Alteration of copper sulfides and the formation of calcium sulfate were in particular observed in the sterile control residue of the Rudna concentrate, due to excessively use of sulfuric acid for pH stabilization. Lead sulfate precipitates increasingly occurred in the bioleaching residues, but represented also a common secondary phase in the sterile leaching residues.
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Dissertations / Theses on the topic "Copper ores – Zambia – Analysis"

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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 of compositions. The first occurrence of a molybdenum stolzite from Broken Hill, Australia, which also contains small amounts of chromium is noted.Raman microprobe spectroscopy has proven to be a very quick and effective non-destructive method for semi-quantitative analysis of the wulfenite-stolzite and powellite-scheelite solid-solution series and in detecting very small amounts of substituted chromate in wulfenite, stolzite and anglesite
Doctor of Philosophy (PhD)
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2

Hellsten, Mark. "GDP per capita and the privatization of copper mines in Zambia : a time series analysis of unit root with structural breaks." Thesis, Örebro universitet, Handelshögskolan vid Örebro Universitet, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-80704.

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Greentree, Matthew Richard. "Tectonostratigraphic analysis of the Proterozoic Kangdian iron oxide - copper province, South-West China." University of Western Australia. Tectonics Special Research Centre, 2007. http://theses.library.uwa.edu.au/adt-WU2009.0054.

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The Cenozoic Ailaoshan – Red River shear zone marks the present day western margin of the South China Block. Along this margin are well preserved late Paleoproterozoic to early Neoproterozoic sedimentary and volcanic successions. This work examines the ages and tectonic environments for the formation of the successions, as well as significance of the regional tectono-magmatic events on the formation of widespread iron oxide-copper deposits. The oldest succession is the Paleoproterozoic Dahongshan Group. A new SHRIMP UPb age of 1675 ± 8 Ma for a tuffaceous schist unit confirms its Paleoproterozoic age. Detrital zircon ages of the Dahongshan Group range between Archean to Paleoproterozoic (ca. 2780 – 1860 Ma). They include a population of ca. 2400 – 2100 Ma grains, which have no known source region on the exposed Yangtze Block. Previous geochemical studies of metavolcanic rocks from the Dahongshan Group have suggested that these rocks were erupted in an oceanic setting. However, this study shows that the metavolcanics are extremely altered and cannot be used for reliable tectonic discrimination. Based on the characteristics of sedimentary rocks in the Dahongshan Group, it is suggested that these rocks were deposited in a continental setting. Overlying the Dahongshan Group is a thick sedimentary sequence which has been variably termed the Kunyang, Dongchuan, Huili or Xide Groups. In the past, these rocks have been considered as a Mesoproterozoic rift succession. However, no precise age constraints were available for the succession. In this study, this sequence is found to contain at least two separate tectonostratigraphic units. The oldest (ca.1140 Ma) is comprised of alkaline basalt with a geochemical and isotopic character similar to that of modern intracontinental rift basalts. The presence of Cathaysia-derived sediments in this unit indicates sedimentary transportation from the southerly Cathaysia Block to the northerly Yangtze Block (in present coordinates) in South China at that time, which suggests an “impactogen” scenario. The thick sedimentary sequence of what has traditionally been defined as the Kunyang Group has been found to have significantly younger depositional age of ca.1000 – 960 Ma. The composition of sedimentary rocks and the provenance of detrital zircons from the Kunyang Group are consistent with a foreland basin setting. The depositional age of this sequence coincides with the timing of Sibao Orogeny as determined elsewhere in the South China Block. Summary Page ii Numerous iron oxide - copper (gold) deposits occur within the rocks of the Dahongshan and Kunyang Groups. Previous studies have classified these deposits into two deposit styles: the Dahongshan-type Paleoproterozoic VMS mineralisation hosted within the Dahongshan Group, and the Dongchuan-type diagenetic carbonate and shale-hosted deposits hosted within the Kunyang Group. However, both deposit types share similarities with the iron oxide – copper (gold) deposit class, such as stratabound disseminated and massive copper ores, abundance of iron oxide occurring mostly as low Ti - magnetite and haematite, and variable enrichments in Au, Ag, Co, F, Mo, P and REE. 40Ar/39Ar data from both deposit types indicate mineralisation ages of ca. 850 – 830 Ma and 780 – 740 Ma.
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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.
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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Lusambo, Martin. "An integrated model of milling and flotation for the optimal recovery of sulphide ores at the Kansanshi mine." Diss., 2019. http://hdl.handle.net/10500/26692.

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Kansanshi mine sulphide ore circuit did not achieve target flotation recovery in 2016, hence it was deemed necessary to carry out a research aimed at optimizing this circuit. The objective of the research was to optimise the Kansanshi milling and flotation circuit processing a copper sulphide ore. In line with this, samples were obtained around the circuit and processed in the laboratory for moisture content, slurry concentration, particle size distribution, and flotation response. This information was then used to build a computer-based model of the Kansanshi milling and flotation circuit. This was done in MODSIM®, a software package specialising in the design and simulation of mineral processing operations. After careful appraisal, appropriate models were selected for the semi autogenous grinding (SAG) and ball mills, SAG mill discharge screen, hydrocyclones, pebble crusher, and the flotation cells. The calibrated model was then used to simulate the effects of key operating parameters on flotation recovery. Analysis using the attainable region technique revealed that the SAG mill feed-rate should be adjusted from 1719 tph to 2090 tph. This would lead to a better utilisation of the pebble crusher that can process 358 tph of pebbles from the current 198 tph. From the simulation work, it was established that rougher flotation recovery can be improved from the current 80.0 % to 82.3 %. The technoeconomic benefits of the proposition are yet to be investigated. Findings from the research concluded that the milling circuit optimum operating parameter; which generated a final product falling predominantly in the range - 150 +38 μm were SAG and ball mills conditions of ball sizes 200 and 40mm respectively, ball mill ball filling 32% and rotational speed between 75 and 80% for both SAG and ball mills. The optimum hydrocyclone feed slurry concentration was found to be 62% solids. Additionally, the SAG mill discharge screen aperture size of 6 mm was the optimum. It must be noted that slurry concentration did not show any impact on both the SAG and ball mills performance. The SAG mill ball filling did not show any significant improvement on performance.
College of Engineering, Science and Technology
M. Tech. (Chemical Engineering)
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Books on the topic "Copper ores – Zambia – Analysis"

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Eckardt, Christian B. Organisch-geochemische Untersuchungen am Kupferschiefer Nordwestdeutschlands: Metallporphyrine als Reife- und Faziesindikatoren. Münster: Lit Verlag, 1989.

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Distribution of gold in porphyry copper deposits. [Reston, Va.?]: U.S. Dept. of the Interior, U.S. Geological Survey, 1988.

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Ltd, ICON Group, and ICON Group International Inc. ZAMBIA COPPER INVESTMENTS LTD.: International Competitive Benchmarks and Financial Gap Analysis (Financial Performance Series). 2nd ed. Icon Group International, 2000.

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Book chapters on the topic "Copper ores – Zambia – Analysis"

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Srivastava, Jyoti, and Pradeep Srivastava. "Biomining Microorganisms' Molecular Aspects and Applications in Biotechnology and Bioremediation." In Biostimulation Remediation Technologies for Groundwater Contaminants, 1–18. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-4162-2.ch001.

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The effective dissolution of metals is widely known with the help of microorganisms called bioleaching or biomining used for the extraction of metals from their ores. Usually the microorganisms involved in biomining are chemolithoautotrophic and extremophilic in nature, since they are living in highly acidic environments (pH 1-3.0) containing heavy concentrations of metals. The commonly found genera of archea are Sulfolobus, Acidianus, Metallosphaera, and Sulfurisphaera. Throughput microbial genomics and proteomics analysis provides novel insights of metabolism mechanisms of bioleaching microbes. These microbes are having significant impact on the bioremediation of acid mine drainage (AMD) resulted from many industrial operations. Using these microbes, various metals including Ni, Cd, Cu, Fe, As, Pb, Hg, Cr, Mn, Zn, etc. are removed from the environment. Biomining microorganisms are having significant applications in the biotechnological processes including extraction of gold from ores, extraction of nickel from low-grade sulfide ores, extraction of copper from chalcopyrite, etc.
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Conference papers on the topic "Copper ores – Zambia – Analysis"

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Kubik, Rafal. "CREATION AND DEVELOPMENT OF QEMSCAN� ANALYSIS PROCEDURE BASED ON POLISH COPPER ORES INVESTIGATION." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/1.1/s01.008.

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Nakajima, Yasuharu, Joji Yamamoto, Tomoko Takahashi, Blair Thornton, Yuta Yamabe, Gjergj Dodbiba, and Toyohisa Fujita. "Development of Elemental Technologies for Seafloor Mineral Processing of Seafloor Massive Sulfides." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96040.

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Abstract Seafloor Massive Sulfides have been expected to be future mineral resources. The grade of valuable metallic elements in ores of Seafloor Massive Sulfides is usually small percentage. If valuable minerals can be extracted from the ores on deep seafloor, the total mining cost can be reduced significantly. The authors proposed Seafloor Mineral Processing, where ores are to be ground into fine particles and separated into concentrates and tailings on seafloor. The Seafloor Mineral Processing system consists of processing units for unit operations such as grinding and separation. To investigate the applicability of flotation, which is a method to separate ore particles by using the difference in wettability of minerals, to the separation unit, measurements of contact angles of sulfide minerals at high pressures were carried out. The results suggested that the contact angles of the minerals would have relationships with pressure in depending on the kind of minerals and solutions. In addition, applying Laser-Induced breakdown Spectroscopy (LIBS), an optical method for elemental analysis, to measurement of metal grade of ore particles handled as slurry in the processing units was also investigated. Signals assigned to copper, zinc, and lead were successfully detected in the spectra obtained from ore particles in slurry flow.
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Туресебеков, Арпай, Носир Шукуров, Хасан Шарипов, Роман Алабергенов, Абдували Зунунов, and Шухрат Шукуров. "Artificial waste as a new source of non-ferrous, noble, rare and toxic metals of Almalyk mining and metallurgical combine." In Mineralogical and technological appraisal of new types of mineral products. Petrozavodsk: Karelian Research Center of RAS, 2019. http://dx.doi.org/10.17076/tm13_4.

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The results of the integrated study of metal waste from Almalyk Mining-Metallurgical Plant (AMMP) are reported. Non-ferrous, noble and rare-metal reserves in waste from the dressing and metallurgical conversion of copper-molybdenum and lead-zinc deposits were evaluated. Analysis of the chemical composition and distribution of non-ferrous, noble, rare and toxic metals and their mode of occurrence in artificial waste from AMMP has shown that they are highly complex ores which could be used to increase metal production at AMMP.
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