Nanometer properties of oceanic polymetallic nodules and cobalt-rich crusts  

作　　者：BAI Zhimin YIN Caiqiao JIANG Xunxiong LIU Xu WANG Shengdong 

机构地区：[1]National Laboratory of Mineral and Rock Material Development&Application,China University of Geosciences,Beijing 100083,China [2]Beijing General Research Institute of Mining and Metallurgy,Beijing 100044,China

出　　处：《Chinese Science Bulletin》2002年第15期1308-1311,共4页

基　　金：This work was sponsored by the International Ocean Area Research & Development Tenth Five-Year Plan Programme (Grant No. DY105-04-01-9).

摘　　要：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 leaching 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 highAn 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.

关 键 词：leaching RESIDUE NANOMETER mineral POLYMETALLIC nod-ules cobalt-rich crusts. 

分 类 号：P744[天文地球—海洋科学]