| http://www.w3.org/ns/prov#value | - Limestone or other mineral aggregate such as chalk, marble all containing in excess of 90% calcium carbonate is charged into the top of each shaft 12 and 14 from a hopper 16 or other supply source by way of inlets 18 and 20, respectively, and the limestone is calcined as it descends slowly to the bottom to each shaft where it is discharged into a collection hopper 22 via outlets 24 and 26 from whi
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