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![A limekiln](http://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Antoing_JPG04.jpg/500px-Antoing_JPG04.jpg)
Credit: Jean-Pol Grandmont
The conversion of limestone to quicklime (calcium oxide) was first carried out in Ancient Egypt but the process remains important even today. The picture shows a traditional limekiln near Antoing in Belgium.