In the modern industrial system, lead-acid batteries are widely used in automobiles, power storage, and other fields due to their stability and high cost-performance. However, their disposal has become a major challenge in the field of environmental protection. If discarded lead-acid batteries are not properly disposed of, the contained lead and sulfuric acid will cause long-term pollution to soil and water environments. The rotary furnace technology is the core solution to this problem. By high-temperature melting, it achieves efficient recovery of lead metal and harmless treatment of hazardous substances, becoming an indispensable part of the circular economy. The rotary furnace adopts a tilted rotating design. Through controlled temperature fields and material rolling mechanisms, battery waste is evenly heated and fully reacted in the furnace. Lead paste, grid plates, and other components are separated at high temperatures, with lead liquid precipitated and recovered. Sulfur elements are converted into solid sulfates for fixation. Compared with traditional incineration or landfill methods, the lead recovery rate of the rotary furnace can reach over 98%, and the emission indicators of exhaust gas after multi-stage purification far exceed environmental standards. This technology not only greatly reduces the pressure of primary lead ore mining, but also transforms hazardous waste into high-value recycled resources. With the increasingly stringent global environmental protection policies and the escalating demand for carbon emission reduction, the rotary furnace process is continuously evolving towards intelligence and low carbon: waste heat power generation systems reduce energy consumption, AI furnace temperature control optimizes reaction efficiency, and exhaust gas desulfurization technologies are iteratively upgraded. All of this has transformed the processing of discarded lead-acid batteries from a "burden" to a "value-added industry", protecting green mountains and rivers while creating significant economic benefits. Choosing rotary furnace technology means choosing responsibility and commitment to the future of the Earth. It is not only an innovation in industrial equipment, but also a technological interpretation of the harmonious coexistence between humans and nature.