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| Electrolysis method described for making 'green' iron | |
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| Tweet Topic Started: 9 May 2013, 01:46 AM (35 Views) | |
| skibboy | 9 May 2013, 01:46 AM Post #1 |
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08 MAY 2013 - 19H29 Electrolysis method described for making 'green' iron ![]() An employee works with a smelting furnace in Salzgitter, western Germany, on March 21, 2012. AFP - Scientists unveiled a new method on Wednesday for extracting metallic iron from its ore while curbing Earth-warming carbon dioxide emissions. This is achieved with electrolysis and has the added benefit of releasing oxygen as a byproduct, a team from the Massachusetts Institute of Technology reported in the journal Nature. The new method, molten oxide electrolysis (MOE), "offers both a substantial simplification of the process and a significant reduction in energy consumption," the researchers wrote. "MOE is also considered a promising route for mitigation of CO2 emissions in steelmaking." Iron, the key ingredient of steel, is extracted from ore mined from the Earth's crust in a process known as smelting, which today requires the addition of carbon at extremely high heat -- releasing CO2. For their electrolysis method, the team developed special new chromium-based anodes that can handle the high temperature and corrosion of the electrical current flowing through them. Previous attempts at electrolysis iron extraction had used expensive iridium-based anodes, said a Nature press statement that described the new anodes as "affordable and durable". In a commentary on the study, Derek Fray of the University of Cambridge's metallurgy department said the findings should stimulate further work to design a large pilot reactor, though "considerable technical development will be required for the authors' discovery to be used commercially". About a billion tonnes of iron was produced worldwide in 2011, Fray wrote in Nature -- contributing about five percent of that year's global increase in atmospheric CO2. Source:
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8:33 PM Jul 11