The Current Status and Future Development Trends of Recycling and Processing Technologies for Waste Circuit Boards
Against the backdrop of rapid development in global information technology and the electronics industry, the popularity of electronic products is constantly increasing, and the cycle of product updates is shortening, leading to an explosive growth in the amount of electronic waste generated. As a core component of electronic products, circuit boards play an important role in discarded electronic devices. According to statistics, the gold content in each ton of waste circuit boards can reach several hundred grams, and the copper content is as high as over 20%, with a metal grade much higher than that of primary ore. However, waste circuit boards also contain various toxic and harmful substances such as lead, mercury, cadmium, brominated flame retardants, etc. If disposed of casually or using outdated recycling processes, it will cause serious pollution to soil, water bodies, and the atmosphere. At present, the recycling and treatment technologies for waste circuit boards can be mainly divided into several categories, including mechanical physical methods, wet metallurgy, pyrometallurgy, and emerging bio leaching technologies. 1. Mechanical physics method is a technology that utilizes the differences in physical properties (such as density, conductivity, magnetism, etc.) of each component of a circuit board for separation and recovery. Typical processes include crushing,...
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