Is it a pottery kiln that has been painted or glazed with lime colours? Is lime syrup or lime pickle cooked in a kiln? Is it an oven for drying lime fruits? None of these are true.
Their job was to produce quicklime (agricultural fertiliser) by the calcination of limestone rock (calcium carbonate). Calcination of the limestone requires heating to around 900 degrees to remove moisture, to oxidise the rock, and to decompose carbonates and other compounds in the rock.
For more information and the process, have a look at the video:
https://www.youtube.com/watch?v=IJpZsvYygF8 You may be amazed, like I was, to understand how toxic and dangerous the process was. A terrible question passed through my mind – is this how third world countries are doing the work still?
The remnants of lime kilns can be found around Tasmania.