Abstract: Addressing the issue of heavy metal pollution in flue gas generated during the treatment of metallurgical solid waste in rotary kilns，this study investigates the application of wet electrostatic precipi⁃ tation（WESP）technology for heavy metal emission reduction，using an enterprise that produces second⁃ ary zinc oxide from zinc-containing materials as a case study. Based on an analysis of flue gas characteris⁃ tics，a combined process of high-voltage electrostatic precipitation and spray dehumidification was select⁃ ed for treatment. The working principle，structural design，key component selection，and optimization of operating parameters for the wet electrostatic precipitator were elaborated. Practical application results show that under stable full-load conditions，after the flue gas is treated by the high-voltage electrostatic precipitation and spray dehumidification system，the average removal efficiency of particulate matter in the flue gas reaches 71.10%. Additionally，the system demonstrates a synergistic effect in reducing heavy met⁃ als such as lead，cadmium，mercury，and arsenic，with removal rates of 66.67%，91.82%，85.33%，and 82.69%，respectively. The removal rate for chromium is nearly 100%. The study indicates that wet electro⁃ static precipitation technology can effectively and synergistically reduce emissions of particulate matter and various heavy metals，providing a reliable technical reference for flue gas treatment and heavy metal pollu⁃ tion control in similar heavy metal-related enterprises.

Key words: metallurgical solid waste, rotary kiln, high-voltage electrostatic precipitator, heavy metal