Nanometer properties of oceanic polymetallic nodules and cobalt-rich crusts |
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Authors: | Zhimin Bai Caiqiao Yin Xunxiong Jiang Xu Liu Shengdong Wang |
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Institution: | (1) National Laboratory of Mineral and Rock Material Development & Application, China University of Geosciences, 100083 Beijing, China;(2) Beijing General Research Institute of Mining and Metallurgy, 100044 Beijing, China |
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Abstract: | An ammonia leaching process was utilized to extract Co, Ni and Cu from oceanic polymetallic nodules, whereas an acid leaching
process was utilized to extract Co, Ni, Cu, Zn and Mn from cobalt-rich crusts. Both processes produced nanometer materials—ammonia
leaching residue and acid leaching residue. A systematic study was conducted on the phase, composition and physicochemistry
properties of these residues. The result shows that both residues contain a large amount of nanometer minerals. Ammonia l
eaching residue mainly consists of rhodochrosite, with the average grain diameter of 17.9 nm; whereas the acid leaching residue
mainly consists of well-developed bassanite, with the average grain deameter of 9.5 nm. The bassanite also has a microporous
structure, the volume of the pore space is 1.23 × 10−2 mL/g. Both the ammonia and acid leaching residues have a large specific surface area, and they display a strong adsorption
capacity to saturate sodium chloride vapour, N2 and SO2. Both residues have high contents of rare earth elements, and most of these elements exist in the state of ionic adsorption.
The content of σ FeO is high. The P2O5 enrichment is observable in acid leaching residues. The unique composition and nanometer solid properties of the leaching
residues displayed their potential value and promised a bright future for their application in the field of environmental
protection and materials. |
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Keywords: | leaching residue nanometer mineral polymetallic nodules cobalt-rich crusts |
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