Electric heating rotary kiln device for producing light calcined magnesia and production method

The invention relates to an electric heating rotary kiln device for producing light calcined magnesia, which comprises a feeding system, a rotary kiln, a light calcined magnesia cooling bin and a carbon dioxide recovery system, the rotary kiln comprises five sections of kiln bodies, the diameters of the five sections of kiln bodies are sequentially reduced, the sections of kiln bodies independently rotate and independently control the temperature, and material guiding and sealing structures are arranged among the sections of kiln bodies. The fourth section kiln body is a high-temperature section kiln body, the rest are low-temperature section kiln bodies, the high-temperature section kiln body comprises a high-temperature section shell and a high-temperature section inner cylinder, a high-temperature section refractory material is arranged between the high-temperature section shell and the high-temperature section inner cylinder, and a heating resistance wire is arranged in the high-temperature section refrac