Results 121 to 130 of about 446 (170)

Marine biominerals: perspectives and challenges for polymetallic nodules and crusts

Trends in Biotechnology, 2009
Deep sea minerals in polymetallic nodules, crusts and hydrothermal vents are not only formed by mineralization but also by biologically driven processes involving microorganisms (biomineralization). Within the nodules, free-living and biofilm-forming bacteria provide the matrix for manganese deposition, and in cobalt-rich crusts, coccolithophores ...
Xiaohong, Wang, Werner E G, Müller
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Composition, Formation, and Occurrence of Polymetallic Nodules

2017
Manganese nodules occur as two-dimensional deposits in abyssal plains of all major oceans. In the Clarion-Clipperton Zone of the northeast equatorial Pacific alone, the amount of nodules is estimated to 21 billion tons indicating the huge potential of this deposit type.
T. Kuhn, A. Wegorzewski, C. Rühlemann, A. Vink   +3 more
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Polymetallic Nodules: Resource Potential and Mining Prospects

Marine Technology Society Journal, 2021
Abstract Deep-sea minerals such as polymetallic nodules have attracted significant interest among stakeholders not only for evaluating their potential as an alternative source of critical metals that are required for various industrial applications including green energy but also in developing technology for their exploitation. There has been a steady
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Metallurgical Processing of Polymetallic Ocean Nodules

2017
During the last five decades metallurgical processing of polymetallic nodule is of global interest—as well as a challenge—for researchers, and industries. This has generated a vast knowledge base, but till now there is no commercial operation. Some of the main reasons are: (1) lack of a techno-economically feasible mining operation, (2) poor economics ...
R. P. Das, S. Anand
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Exploration for Polymetallic Nodules

1980
This paper is an introduction to the field of polymetallic nodule exploration, most of which lies at the bottom of the ocean below 15,000 ft. Among the minerals that are expected to be found under the ocean, polymetallic nodules are probably the most unusual.
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Electrowinning of nickel in the processing of polymetallic sea nodules

Hydrometallurgy, 1990
Abstract As the land based reserves for nickel in India are meagre its extraction from sea nodules will assume increasing importance in the coming years. In the processing of polymetallic sea nodules by the reduction roast/ammonia leach/solvent extraction route, the recovery of nickel by electrolysis was considered.
V. Kumar, B.D. Pandey, D.D. Akerkar
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Computer axial tomography investigation of polymetallic nodules

Marine Geology, 1997
Abstract Polymetallic nodules collected from the Clarion-Clipperton region of the North Pacific Ocean have been investigated by using a SIEMENS SOMATROM HiQ computer tomograph. The reconstructed tomographies show much details in the internal structure of the nodules, such as nucleus shape and origin, primary and secondary growth surfaces, highly ...
O.G. Duliu, M.S. Tufan, S.A. Szobotka
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A study on arsenic adsorption on polymetallic sea nodule in aqueous medium

Water Research, 2005
A detailed study on As(III) and As(V) adsorption on polymetallic sea nodule in aqueous medium has been reported. Elemental composition of sea nodule comprises primarily, iron, manganese and silicon with trace quantities of aluminium, copper, cobalt and nickel.
S, Maity, S, Chakravarty, S, Bhattacharjee, B C, Roy   +3 more
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Sustainable Processing of Deep-Sea Polymetallic Nodules

2017
The possibility of commercialization of processing technology for sea nodules has been linked with comparisons with similar terrestrial process operations. In addition to techno-economic viability, an added focus to commercialization is the sustainability of the process route. The general context of sustainability is discussed.
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Impacts of Mining Polymetallic Nodules on Surface Seawater and Marine Picophytoplankton

Environmental Science & Technology
Polymetallic nodules' (PMNs) deep-sea mining poses risks to marine ecosystems, yet its effects on surface picophytoplankton remain unclear. This study assessed metal release from PMNs and its impact on picophytoplankton in the Clarion-Clipperton zone through laboratory and field incubation experiments.
Shuangshuang Lin, Jinli Qiu, Xiaohu Li, Yangsheng Zhong, Kailun Huang, Lei Wang, Xuguang Huang   +6 more
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