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美国田纳西州国立橡树岭研究所的研究人员已研究出一种从煤灰中提取铝和其它有用金属的方法。这种方法不仅能从废物中回收有用金属,还能帮助电力事业按环保要求处理煤灰。国立橡树岭研究所的处理方法是第一个能与开采铝土矿相竞争的回收方法。美国燃煤发电厂每年产生6000多万吨煤灰废物。每吨废物含300多磅氧化铝和150磅铁。从煤灰中回收铝及其它金属不仅会减少必须处理的废物量,而且能尽量降低处理费用(目前为15～20美元/吨)。
Researchers at the National Oak Ridge Institute in Tennessee have developed a method of extracting aluminum and other useful metals from coal ash. This method not only recycles useful metals from the waste, but also helps the utilities to dispose of the coal ash according to environmental requirements. The National Oak Ridge Institute is the first disposal that can compete with mining bauxite. Each year coal-fired power plants in the United States generate more than 60 million tons of coal ash waste. Each ton of waste contains more than 300 pounds of alumina and 150 pounds of iron. The recovery of aluminum and other metals from soot not only reduces the amount of waste that must be disposed of but also minimizes processing costs (currently $ 15-20 / tonne).