In the process of recycling lead smelting (or other secondary non-ferrous metals), the smelting process needs to be made into a smelting furnace for smelting. The material is made into a lumps by an automatic pelletizing machine, dried and sent to a smelting furnace, and then added with auxiliary materials. , fuel, reducing agent, etc., through the smelting furnace to recover lead, copper and other main metals, while recovering gold, silver and other precious metals, to achieve comprehensive utilization of resources, alleviate the shortage of non-ferrous metal resources, the main metal (lead, copper) recovery rate of 95% above , the silver recovery rate is 90%, and the gold recovery rate is about 70%. The complete set of equipment is mainly composed of a mass transfer trolley, a mixed conveying trolley, a sealed furnace cover and an automatic control system.