Used lead-acid batteries generally come from scrapped automobiles and electric bicycles. Based on structural and functional differences, lead-acid batteries can be categorized into starting (flooded) lead-acid batteries, motive (starved electrolyte) lead-acid batteries, and other types. Waste lead-acid batteries contain 30% to 40% (by mass) of waste lead paste. This process is the lead paste refining process, which adopts the alkaline pyrometallurgical refining method. The pyrometallurgical refining workshop is equipped with refining pots, using negative pressure operation and indirect heating methods, whereby refining is carried out under negative pressure conditions. Liquid lead is conveyed by a lead pump to the refined lead pot in the pyrometallurgical refining workshop. Under conditions of 420-450℃, a small amount of NaOH and sodium nitrate refining agents are added to remove impurities. This process of refining produces refined lead. This dataset is applicable to the refining process of lead sludge from waste lead-acid batteries.