Abstract:In this paper, the variation of copper, gold, and silver content over time in 72 waste printed circuit boards samples from 9 types, 8 years, including television, computer, air conditioning, and refrigerator were analyzed . There is a significant difference in copper content among different types of waste circuit boards, with the lowest average value for washing machine circuit boards (4.58%) and the highest average value for telephone circuit boards (20.38%). The gold and silver content in waste circuit boards has been decreasing year by year. The average gold content in telephone circuit boards is the lowest (0.17g/t), while the average gold content in mobile phone circuit boards is the highest (305.69g/t). The silver content in telephone circuit boards is the lowest (3.19g/t), and the silver content in computer circuit boards is the highest (524.12g/t). The economic value of different types of circuit boards varies greatly, with mobile phone circuit boards having the highest economic value (186000 yuan/ton), gold having an economic value of 168000 yuan, and washing machine circuit boards having the lowest economic value (6000 yuan/ton). Based on years of production experience, suggestions have been made for controlling the composition of incoming materials for pyrometallurgical treatment of waste circuit boards.