Bibliographies thématiques / Crown Copper and Sulphur Mine

Littérature scientifique sur le sujet « Crown Copper and Sulphur Mine »

Auteur : Grafiati

Publié le 26 juillet 2024

Mis à jour le 27 juillet 2024

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Articles de revues sur le sujet "Crown Copper and Sulphur Mine"

Nuno, Cristelo, Coelho João, Miranda Tiago, Sousa Luis, Fernández-Jiménez Ana et Oliveira Mafalda. « Stabilisation of high-sulphide tailings with alkali activated fly ash – mechanical performance ». MATEC Web of Conferences 274 (2019) : 02001. http://dx.doi.org/10.1051/matecconf/201927402001.

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Mine tailings could represent a step forward in terms of the quality of the aggregates that usually accepted in civil engineering applications, due to their specific weight and compressive strength. The Neves-Corvo copper mine produces approximately 3 million tons of tailings every year, which could supply several construction works, at least in the south of Portugal. Nevertheless, this industrial waste requires stabilisation, not only due to their high sulphur content, but also due to mechanical performance demands. This paper focus on the stabilisation, without previous thermal treatment, of the mine tailings from Neves-Corvo.

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Choudhury, P. B., A. K. Raina, M. Ramulu, A. K. Chakraborty et C. Bandopadhyay. « Crown pillar stability assessment in an underground copper mine using acoustic emission ». International Journal of Rock Mechanics and Mining Sciences 41, n^o 3 (avril 2004) : 399–400. http://dx.doi.org/10.1016/j.ijrmms.2003.12.055.

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Choudhury, P. B., A. K. Raina, M. Ramulu, A. K. Chakraborty et C. Bandopadhyay. « Crown pillar stability assessment in an underground copper mine using acoustic emission ». International Journal of Rock Mechanics and Mining Sciences 41 (mai 2004) : 235–40. http://dx.doi.org/10.1016/j.ijrmms.2004.03.047.

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Awoniran, Adijat T., Annelly Ketheson, Sandra Piazolo et Damian B. Gore. « Legacy base metal slags can generate toxic leachates ». Powder Diffraction 32, S2 (décembre 2017) : S70—S77. http://dx.doi.org/10.1017/s0885715617000999.

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Slags sourced from a derelict zinc–lead–copper–silver–tungsten mine were examined for their bulk elemental composition and mineralogy. pH, oxidation–reduction potential, and the leachability of selected elements (sulphur, calcium, iron, copper, zinc, and lead) were assessed during a 130-day deionised water extraction conducted under oxic conditions. Slags were rich in silicon, iron, copper, zinc, and lead, hosted within minerals including quartz (SiO2), goethite [FeO(OH)], augite [Ca(Mg,AI,Fe)Si2O6], and lead (Pb0). Leachates from the slags increased in analyte concentration throughout the 130-day experiment, with iron, copper, zinc, and lead attaining >5 mg l−1 in some samples. These findings indicate that this pyrometallurgical waste should not be considered environmentally inert, as leachates emanating from them in the field might pose a significant risk to the environment.

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Lamia, Benabbes, et Bounouala Mouhamed. « Reprocessing and environmental desulphurization of sulphide mining waste from sphalerite flotation : case of Chaabet El Hamra mine, Algeria ». World Journal of Engineering 14, n^o 1 (13 février 2017) : 42–46. http://dx.doi.org/10.1108/wje-11-2016-0128.

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Purpose Tailings generated by sulphide ore processing at Chaabet El Hamra mine contain a variety of sulphide minerals such as pyrite, marcasite, sphalerite, galena and chalcopyrite with carbonated and siliceous gangue. It is well known that the presence of pyrite can cause environmental threats, in particular the acid mine drainage risk (AMD), if there is not enough neutralizing potential. Waste chemical analyses show that the content of total sulphur (S) is more than 9 per cent, which could be possible to separate the pyrite from other heavy minerals based on interfacial property of these minerals, because the pyrite contain the sulphur-rich fraction. Design/methodology/approach In this study, the possibility of waste reprocessing using froth flotation of sulphuric bulk and depression-heavy minerals. It is environmental desulphurization that removes much of the high S fraction. Findings The results obtained in terms of S recovery and residual S content are interesting after merely 12 min of flotation by addition of potassium amyl xanthate collector (140 g/t), pine oil frother (10 g/t) and activation with copper sulphate (CuSO4+; 60 g/t) and at optimum pH of 5. Originality/value It can be shown from waste treatment by flotation of pyrite depression sphalerite collects significant desulphurization in sulphur content is 19 per cent against 8 per cent in the initial release.

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Greben, H. A., J. P. Maree, Y. Singmin et S. Mnqanqeni. « Biological sulphate removal from acid mine effluent using ethanol as carbon and energy source ». Water Science and Technology 42, n^o 3-4 (1 août 2000) : 339–44. http://dx.doi.org/10.2166/wst.2000.0400.

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Mining effluents are major contributors to mineralization of receiving waters and can be toxic to man, animals and plants due to unacceptably high concentrations of heavy metals. A biological sulphate removal process has been developed for the treatment of sulphate-rich industrial effluents, where sulphate is converted via sulphide to sulphur in an anaerobic single-stage reactor. Ethanol is used as carbon and energy source. Sulphate was removed from acid mine water over a period of 95 days from 3000 mg/l down to less than 200 mg/l and the formed sulphides to less than 200 mg/l. The VSS value in the reactor varied between 3 and 4 g/l, resulting in a specific sulphate removal rate from 0.47 to 2.47 g SO4/(g VSS.d), while the volumetric rate was 2.5 and 8.4g SO4/(2.d) at HRT of 18 to 4.3 h. The experimental COD/sulphate ratio was between 0.55 and 0.84, which is in accordance with the theoretical value of 0.67. The experimental sulphide/sulphate ratio was less than the theoretical value of 0.33 due to the conversion of sulphate to sulphur and due to metal sulphide precipitation. Iron and copper were removed completely and aluminium, manganese and zinc to less than 4 mg/l.

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Gardner, Wendy C., M. Anne Naeth, Klaas Broersma, David S. Chanasyk et Allen M. Jobson. « Influence of biosolids and fertilizer amendments on element concentrations and revegetation of copper mine tailings ». Canadian Journal of Soil Science 92, n^o 1 (janvier 2012) : 89–102. http://dx.doi.org/10.4141/cjss2011-005.

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Gardner, W. C., Naeth, M. A., Broersma, K., Chanasyk, D. S. and Jobson, A. M. 2012. Influence of biosolids and fertilizer amendments on element concentrations and revegetation of copper mine tailings. Can. J. Soil Sci. 92: 89–102. A 3-yr field study on copper mine tailings in British Columbia determined the effects of fertilizer and biosolids on element concentrations in tailings and vegetation and on plant biomass. Biosolids applied at 50, 100, 150, 200 and 250 Mg ha−1(dry weight) increased total carbon, iron, magnesium, nickel, nitrogen, phosphorus, sulphur and zinc and available ammonium, iron, manganese, nitrate, phosphorus and zinc in tailings. With highest applications on silt loam tailings, total zinc (214 mg kg−1) exceeded Canadian Council of Ministers of the Environment guidelines for agricultural soils. Total chromium and copper exceeded these guidelines but not due to biosolids, being high in controls (chromium 38, 8; copper 647, 1291 mg kg−1; silt loam and sandy sites, respectively). Plant tissue calcium, phosphorus, magnesium, manganese, nitrogen and zinc increased with increasing biosolids. Plant tissue calcium (20 g kg−1) and molybdenum (5 mg kg−1) exceeded National Research Council maximums for beef cattle. Total molybdenum in unamended silt loam (35 mg kg−1) and sandy tailings (18 mg kg−1) and vegetation on silt loam (112 mg kg−1) were high. Biosolids had variable effects on tailings molybdenum and decreased total plant tissue molybdenum. Fertilizer and control treatments had limited plant growth. Managed biosolids use in reclamation can ameliorate sites and facilitate vegetation establishment, with low environmental risk.

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Herr, Claudia, et N. F. Gray. « Seasonal variation of metal contamination of riverine sediments below a copper and sulphur mine in South-East Ireland ». Water Science and Technology 33, n^o 6 (1 mars 1996) : 255–61. http://dx.doi.org/10.2166/wst.1996.0104.

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The discharge of acid mine drainage (AMD) from the abandoned sulphur and copper mines at Avoca (S.E. Ireland) results in the formation of ochreous deposits on the river substrate. Sediment sampling was carried out intensively during June and August, 1994 and again during March and April, 1995 to investigate seasonal variation of Fe, Cu and Zn concentration in riverine sediments of the receiving water (Avoca River). Temporal and spatial variations indicate that, apart from pH, hydrological factors play a major role in metal accumulation of highly energetic river systems. Zinc adsorption and desorption of “ochre” is chiefly regulated by pH, while Cu removal seems to be primarily by co-precipitation with iron. Basic considerations with regard to sampling techniques are discussed.

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Cristelo, Nuno, João Coelho, Mafalda Oliveira, Nilo Cesar Consoli, Ángel Palomo et Ana Fernández-Jiménez. « Recycling and Application of Mine Tailings in Alkali-Activated Cements and Mortars—Strength Development and Environmental Assessment ». Applied Sciences 10, n^o 6 (19 mars 2020) : 2084. http://dx.doi.org/10.3390/app10062084.

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Mine tailings (MT) could represent a step forward in terms of the quality of the aggregates usually used in civil engineering applications, mostly due to its high density. The Portuguese Neves Corvo copper mine, owned by the Lundin Mining Corporation, produces approximately 3 million tonnes per year. Nevertheless, it cannot be used in its original state, due to its high levels of sulphur and other metals (As, Cr, Cu, Pb, Zn). This paper focuses on the stabilisation/solidification of high-sulphur MT, without any previous thermal treatment, using alkali-activated fly ash (FA). The variables considered were the MT/FA ratio and the activator type and concentration. A fine aggregate was then added to the pastes to assess the quality of the resulting mortar. Maximum compressive strengths of 14 MPa and 24 MPa were obtained for the pastes and mortars, respectively, after curing for 24 h at 85 °C. Thermogravimetric analysis, scanning electron microscopy, X-ray energy dispersive spectroscopy, X-ray diffraction, and infrared spectroscopy were used to characterize the reaction products, and two types of leaching tests were performed to assess the environmental performance. The results showed that the strength increase is related with the formation of a N-A-S-H gel, although sodium sulphate carbonate was also developed, suggesting that the total sodium intake could be optimized without strength loss. The solubility of the analysed metals in the paste with 78% MT and 22% FA was below the threshold for non-hazardous waste.

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Zhixun, Lin. « Leachate chemistry and precipitates mineralogy of rudolfsgruvan mine waste rock dump in central Sweden ». Water Science and Technology 33, n^o 6 (1 mars 1996) : 163–71. http://dx.doi.org/10.2166/wst.1996.0093.

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The chemical and mineralogical properties of leachates and precipitates formed in a sulfide ore mine waste rock dump were studied by atomic adsorption spectrometry, optical petrography, X-ray diffractometry, scanning electron microscopy with energy dispersive spectroscopy. The dump is divided into a leached horizon and an accumulation horizon. The intensity of sulfide oxidation decreases with depth. Leachates are characterized by acid and enriching Fe, SO4 and other metals. Secondary minerals consist mainly of goethite, with some jarosite, schwertmannite ferrihydrite elemental sulphur and Cu and Zn compounds including copper iron oxides, Cu and Zn oxides (hydroxides) and Zn-sulfates. Dissolved Al, Cu, Zn, Si and S are partialy retained by goethite, precipitating in a microbanded texture. The banded formation indicates temporal variability in pore water chemistry influenced by episodic/seasonal hydraulic flushing. The dump is rather old and could provide an important information, or “natural analogue” to the future evolution of the rock dumps that are being generated at currently operating mines.

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Thèses sur le sujet "Crown Copper and Sulphur Mine"

Simson, William Ronald. « Removing Reds from the Old Red Scar : Maintaining and Industrial Peace in the East Tennessee Copper Basin from the Great War through the Second World War ». Digital Archive @ GSU, 2010. http://digitalarchive.gsu.edu/history_diss/17.

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This study considers industrial society and development in the East Tennessee Copper Basin from the 1890s through World War II; its main focus will be on the primary industrial concern, Tennessee Copper Company (TCC 1899), owned by the Lewisohn Group, New York. The study differs from other Appalachian scholarship in its assessment of New South industries generally overlooked. Wars and increased reliance on organic chemicals tied the basin to defense needs and agricultural advance. Locals understood the basin held expanding economic opportunities superior to those in the surrounding mountains and saw themselves as participants in the nation’s industrial and economic progress, and a vital part of its defense. The study upends earlier scholarship contending local industrial concerns acted proactively to challenges from farmers harmed by industrial pollution; investigation shows firms hesitated to initiate new production processes and manipulated local elections. Partisan developments woven amid all this underscore errors in assuming ancient regional affinity for Republicans. Confederate heritage gave Democrats an historic advantage that fractured before New Deal progressivism and expanding basin Republican power. Markets forced basin firms to merge and embrace technological change affecting working people’s relationships, forcing workers to improve skills or settle for low-skill jobs. Excepting TCC managers and supervisory staff, provincialism ruled; suspicions and competitiveness among workers grew as most miners lived a few scattered villages and most managers and craftsmen settled in the basin’s “Twin-cities” district. Early union efforts collapsed before union mismanagement, rational management and a company union based upon Sam Lewisohn’s ideals. Management managed to wrest control of its industrial relations despite the effects of Depression and the New Deal’s empowerment of workers. Workers’ infighting, reflecting neighborhood demographics and ideological differences, benefitted TCC; it convinced locals TCC could best protect industrial peace. The submissive AFL union installed fit of ownership’s nationally recognized program for industrial relations reliant on federal power. After competition crippled local industry, locals continued their reliance on government: to investigate the medical consequences of extraction work and coordinate environmental restoration. Recent regional anti-government populism makes the basin’s peculiar historic reliance on federal help engaging.

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Livres sur le sujet "Crown Copper and Sulphur Mine"

Orford Nickel & Copper Company., dir. Reports on the Crown Copper and Sulphur Mine : Owned by the Ordord Nickel & Copper Co. Boston : W.K. Moody, 1991.

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Chapitres de livres sur le sujet "Crown Copper and Sulphur Mine"

Öhrström, Lars. « Death at Number ». Dans The Last Alchemist in Paris. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199661091.003.0009.

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The five others went first, one by one, and contemporary sources noted how humane the spectacle was, as the participants did not need to see each other. Thousands of Stockholmers had turned out to watch, on this cold day of 30 January 1744, as the last of the six, Gustaf Schedin, accountant at the Insjö copper works, mounted the scaffold. As the culmination of the show, he would be both beheaded and then cut to pieces. The summer before, Schedin had led the fourth Dalecarlian Rebellion: the last march of the free miners and farmers of Dalarna— the mine-rich county 100 miles north-west of Stockholm—to the Swedish capital, in a movement expressing raging discontent with the king, Fredrik I, and his disastrous war with Russia. This sort of thing had been successful before: the fiercely independent-minded people of Dalarna traditionally wielded a certain power, rich as they were in natural resources—the jewel in the crown being the famous Great Copper Mountain mine in Falun. Once it was the largest of its kind in the world, and yielded something like 70 per cent of the world’s copper production. The Falun mine, like many others, was once managed as a cooperative operation, and worked by free miners called mountain-men (bergsmän) with special privileges and laws of their own. But their time was at an end. In 1743 the uprising ended in a bloodbath in Stockholm, and now the six leaders were to be executed. The copper mine was also losing its privileged position. It had given the Swedish kings and queens economic strength for numerous more-or-less successful military adventures down in continental Europe, but was now in decline, and so was the military power of Sweden. This traditionally male activity—becoming angry and getting the lads together to sort things and people out—is chemically related to high levels of the large organic molecule testosterone. For a inorganic chemist inclined to find a good story, it would have been great to now present a direct link between copper and the way we make this molecule in our bodies, starting from cholesterol, claiming that this made the men from Dalarna more inclined to hasty revolutionary actions.

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