When discarded electronic devices pile up like mountains, and the metals and plastics on circuit boards become "urban minerals," a system called the "Water Selection Recovery Equipment for Waste Circuit Boards" is quietly changing the trajectory of resource recycling. It is not only a crystallization of technological innovation, but also an important support for the implementation of the circular economy concept. With the power of technology, it has opened up a green channel for the "rebirth" of electronic waste. Electronic waste is called "misplaced resources." Circuit boards are rich in precious metals such as gold and silver, as well as non-metallic materials like plastics and fiberglass. If not handled properly, it not only wastes resources but also pollutes the environment. Traditional recycling methods often use incineration or acid leaching, which can extract some metals but leads to secondary pollution from toxic gases and heavy metal wastewater. The emergence of water selection recycling technology has fundamentally reversed this situation. Based on the principle of physical sorting, this technology uses the differences in density, particle size, and surface properties of materials in water to achieve efficient separation. The entire process does not require chemical reagents, thereby eliminating the risk of pollution at the source. A complete water selection recycling equipment typically consists of four modules: crushing, sorting, dewatering, and collection. First, the waste circuit boards are crushed into uniform particles by a crusher, breaking down their original structure and creating conditions for subsequent sorting. Next, the materials enter a hydrocyclone or flotation machine. Under the action of water flow, lightweight plastics and resins float to the surface, while metal particles sink, achieving preliminary separation. A precision grading sieve further screens the materials by particle size, enhancing the purity of the sorting. In the dewatering stage, centrifugation or filter press equipment is used to remove water, obtaining dried metal and non-metallic products. Finally, various materials are collected into collection bins, awaiting subsequent resource utilization. It's worth noting that modern water selection equipment has deeply integrated automation and intelligent technologies. Sensors monitor the sorting effect in real time, image recognition systems accurately identify material components, and intelligent control systems dynamically adjust water flow speed and equipment parameters to maximize sorting efficiency and accuracy. This "smart sorting" not only reduces labor costs but also increases metal recovery rates to over 98%, significantly improving the purity of non-metallic materials, truly achieving "full utilization of resources." From an environmental perspective, water selection technology avoids the discharge of harmful substances, protecting soil and water safety; from an economic perspective, the recovered metals can be directly used as metallurgical raw materials, and non-metallic materials can be made into wood-plastic composite materials or roadbed fillers, doubling their value. More importantly, this technology transforms the linear economy model of "extraction-manufacturing-disposal" into a closed loop of "resources-products-renewable resources," injecting a sustainable gene into the electronics manufacturing industry. However, the promotion of this technology still faces challenges. The upfront investment in equipment is high, which deters small and medium-sized enterprises; the recycling system is not yet perfect, and many waste circuit boards still flow into illegal dismantling channels. This requires the combined efforts of policy guidance, funding support, and public participation to ensure that green technologies truly take root and flourish. In summary, the water selection recovery equipment for waste circuit boards is not only a technological breakthrough but also a practical carrier for ecological civilization construction. It is like a silent "mineral alchemist," awakening the value of waste materials in the murmur of water, allowing technology and nature to coexist in harmony. In the future, with technological iteration and the deepening of the circular economy concept, this green engine will surely contribute more to building a "waste-free city" and a low-carbon society.