Although additional energy is required to separate O 2 from N 2, the majority of the energy input can be recovered because the carbonator reaction is exothermic and CO 2 from the calciner can be used to power a steam cycle.
22.
Air compressors and rock drills were obtained, and the calciner and reverberatory furnace were in working order . 30 tons of arsenic and 5.4 tons of copper were produced in 1922, and 200 tons of arsenic in 1923.
23.
Many of the buildings on the mine property have been listed as Grade II buildings : the engine house and arsenic calciner on 21 November 1985, the chapel for the mine on 14 April 1999, and the mine's smithy building on 7 December 2004.
24.
In 1974 the pilot plant was transferred to the new School of Mines Trevenson Campus at Pool and the'mill complex'part of the site which included the mill, stamps, mill engine house, boiler house and the calciner had been largely stripped of their equipment and were no longer required for educational purposes.
25.
Work carried out in 1916-17 included the construction of flues for saving arsenic, the electric lighting of the mines and mill, the construction of a new concrete dam, a new elevated double rope line form the new tin shaft to the mill, new self feeders at the mill, and the redressing works was to be remodelled and shifted from its present location at the mill to the calciner.
