Abstract: Furnace for producing calcium oxide, including a container which internally has a baking chamber provided with a central axis and with a calcination zone for the calcareous material, provided with burners, characterised in that it includes, at said calcination zone, at least a first group of said burners positioned, with the respective outlets, substantially at a same first distance (A) from said central axis and at least a second group of said burners positioned, with the respective outlets, substantially at a same second distance (B) from said axis, said first group of burners being overlapped to said second group of burners relative to the dropping direction of the calcareous material and said second distance (B) being less than said first distance (A).