↑   Estimates vary all over the world, but most resources provide a figure of 2–4kg of bauxite for each 1kg of alumina. Historic Significance: Aluminium was once considered to be a exceptional and important metallic, even surpassing gold and silver in really worth. It was used for crowns and cutlery for https://aluminium-greenhouse23456.get-blogging.com/38025635/the-ultimate-guide-to-sheds-and-garages