The first kiln was built in 1994 with a capacity of 400 t/d using heavy oil as fuel. A good 10 years later, felxibility was again required for the fuels used and a firing system for petroleum coke dust was additionally installed.
By 2004, however, Calidra had already decided to build a new Maerz-Finelime® kiln in order to be able to use more limestone from the quarry: this kiln had a capacity of 300 t/d with small stone or could also be used flexibly with larger stone at a capacity of 400 t/d.
In 2010, the starting signal was given for the next step in the expansion of the plant: Calidra invested in the future of the plant with a 600 t/d PFR kiln of the type R4S and the modernisation of the limestone feed. Again, this project also involved flexibility in the use of fuels - the kiln can be operated with either petroleum coke or charcoal.