For the production of Calcium Oxide (Quicklime). The novelty of the process is that it is a rotary kiln of indirect fire and it operates in a discontinuous way. The process is composed by three phases, first of them it is the preheating, the second is the baking which is the kiln itself, it is the main part of the machine, and finally the cooler which is able to reduce the material temperature from near to 1000ºC to the 50ºC. Each one of the phases is composed by a rotary tube, with discontinuous operation. The time which remains the material in each tube is directly related to the time which the load spends inside the main tube, which is the second tube, to be transformed into Calcium Oxide. The calcium carbonate is controlled at any time through the weight, in this way when the kiln detects that all the Calcium Carbonate has been transformed into Calcium Oxide, the kiln is unloaded automatically and the cycle is repeated continuously. The advantages of this kiln are: You get high lime quality from the first baking, without wasting time and money in regulation and calibration tests. The material cannot be polluted by the ashes of the exhaust gases of the combustion, because this kiln operates by indirect fire. In this form you can use for the combustion: biomass, diesel, refuse derived fuel (RDF) or any other type of combustible. In this way you can get high lime quality. Due to we control the material, the permeabilization of the particles of Calcium Oxide is avoided, avoiding troubles during the lime slaking. You can mix several grain sizes from microns to 10 mm.
1- Preheat the material before putting it inside the kiln. Design as customer necessities from 10 Tons per day of CaO until 50 Tons per day of CaO.
2-Preheat the air used by the burner. In addition, we can optimize the consumption if we take advantage of the heat coming from the exhaust gases for: