Industrialization method for purifying lead through vacuum method

The invention relates to the technical field of metallurgy, and provides an industrialization method for purifying lead through a vacuum method. 4N lead is adopted as a raw material, and impurities are removed through two-step vacuum distillation by utilizing the difference of boiling points of various impurities and lead in the 4N lead. In the first step, low-boiling-point impurities such as Se, Te, As, Sb, Tl and Cd are removed through vacuum constant-temperature stirring distillation, and impurity-removed 4N lead and high-impurity crude lead are obtained. In the second step, high-boiling-point impurities such as Cu, Fe, Ni and Sn are removed through vacuum continuous distillation treatment on the impurity-removed 4N lead, a product with the impurity content in lead reaching the YS/T 265-2012 standard is finally obtained, the daily treatment capacity is 1-30 t, the energy consumption is smaller than 800 kilowatt-hour per ton, the metal residual rate is about 1%, the volatilization rate is smaller than 1%, a