Refining and extraction process of precious metals from electronic waste waste circuit boards
Tons of waste circuit boards (computer boards) contain Gold (Au) 118g/t, Silver (Ag) 730g/t, Palladium (pd) 30g/t, Platinum (Pt) 8g/t, Copper (Cu) )150kg/t; these are the recycling values of waste circuit boards. The most important thing in the waste circuit boards is the chip de-gold treatment, and the precious metals in the circuit board chips are recovered and refined.
Waste circuit boards are disassembled into tin slag, metal components, electrolytic capacitors, integrated circuit chips, chip capacitors, plastic packaging, CPU and RAM, and motherboards by automatic dismantling machines. Tin slag and metal components can be sold directly, and electrolytic capacitors are separated into aluminum powder and plastic powder by capacitor recycling equipment, which is also very useful. Heavy metals such as platinum, palladium, gold, silver and copper can be extracted from integrated circuit chips and chip capacitors through carbonization furnaces and precious metal sorting and refining equipment. The recycling value of waste circuit boards is very large.
For silver- and palladium-containing acoustic surfaces, metal-encapsulated triodes, and integrated circuits, use a special cutting machine to cut off the metal shell and punch out the chip, and then extract valuable metals according to the chip and integrated circuit scheme. After crushing, metal aluminum is directly smelted. For Zener diodes, some varactor diodes, and other glass-encapsulated components, plastic-encapsulated light-emitting tubes are crushed to refine valuable metals, and organic acids are used for circuit boards to be cyclically leached.
In addition, a very important part in the refining of precious metals is to calcine the components such as chips and integrated circuits through ozone (ozone can completely eliminate harmful fumes) with hydrochloric acid pseudo-medium to extract platinum and palladium, and extract gold, platinum and palladium. Some of the patches with high silver palladium are independently refined silver palladium by acid method.
SUNY GROUP is a very professional manufacturer of electronic waste recycling equipment. Through the recycling of waste circuit board electronic waste through circuit board recycling production lines, resin powder and metal powder can be obtained. At the same time, through precious metal refining equipment and gold extraction equipment, it can be recycled. Precious metals in e-waste are extracted. We have a complete set of design scheme and technological process. If you want to know more, please feel free to contact us for consultation.
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