Creating charcoal is a specialist skill and air dried oak gives the best return by weight. Indeed, 6 tonnes of air dried wood will give about 1 tonne of charcoal. The secret to producing charcoal is in controlling the amount of air fed into the burn - the kiln needs to be hot enough to drive out moisture and impurities but not too hot that the contents is reduced to pile of ash!
A few years ago we inherited a charcoal kiln for Hazel Woodland Products (http://www.hazelwoodlandproducts.co.uk/) for which a controlled burn is planned in the summer term. Such is the size of the kiln that this will require 24 hour surveillance!
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