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New technology allows mineral extraction from manganese nodules
By Ko Dong-hwan
The Korean Government has successfully tested a technology to extract minerals from manganese nodules, opening a new way to capitalize on rich oceanic mineral reserves, the Ministry of Oceans and Fisheries announced on Thursday.
The ministry said it extracted copper, nickel and cobalt from a manganese nodule raised from the seabed at 5,000 meters deep.
The nodule was first dried and crumbled into smaller bits. Additives and reducing agents, including limestone, were then added. After melting the mixture at 1,450 degrees Celsius, the minerals were extracted from the liquid.
The ministry said the test showed the technology was feasible.
The Korea Institute of Geoscience and Mineral Resources developed the technology at a Dongbu Metal factory in Donghae city, Gangwon Province.
“This success has given us a core key to commercialize the minerals,” said a ministry official. “The extraction process generally takes up about 60 percent of the entire investment costs, so this new method will hopefully make the process cheaper.”
The method is expected to replace annual imports worth 2 trillion won.
Korea had acquired sole prospecting rights over the Clarion-Cliperton zone, about 2,000 kilometers southeast of Hawaii, from the International Seabed Authority in 2002.
The area is estimated to contain about 560 million tons of manganese nodules, which will allow Korea to extract 3 million tons of manganese nodules each year for 100 years – worth about $370 billion, or 395 trillion won.
The ministry plans to develop further technologies to extract other minerals from under the sea.