How to extract precious metals from waste circuit boards?
In addition to containing 30% inert oxides and 30% plastic, these scrapped circuit boards also contain 40% metal substances, and in these metal substances, they contain 0.1% gold content. At present, most people who extract gold from circuit boards choose "circuit board recycling equipment", which is a very simple and convenient metal separation equipment. Metals are separated from non-metals, and gold is extracted through a series of steps.
First of all, we have to distinguish waste circuit boards, which are generally divided into two categories for recycling: the first type is circuit boards with electronic components, which requires us to disassemble the electronic components on the circuit board one by one through a disassembly machine, and then Then proceed to the next step on the disassembled electronic components and master. The second type is the circuit board without electronic components, which can be directly crushed and recycled, and then the resin, fiber, gold, silver, copper and other substances contained in it are separated, so that high-quality metal substances will be obtained. At this time, we The metal can be recycled and then sold at a good price to make a profit.
The first type of simple dismantling and the second type of smashing and separation can be sold at a good price. Of course, the most profitable one is to completely extract gold. If you want to extract gold, you must understand the application of gold in circuit boards. Gold is widely used in the manufacture of circuit boards due to its characteristics of corrosion resistance, non-brittleness, good power connection characteristics, good reliability, and strong plasticity. It can not only improve the service life of products, but also greatly reduce the cost of electronic equipment. fault problem. But we also know that the price of gold is expensive, and it is impossible for manufacturers to use gold to make all parts, but to use copper, zinc, and tin to replace part of the gold. Gold is only used for key components such as heat pipes and heat sinks, especially for some high-end electronic equipment. The amount of gold used will greatly increase. higher.
So how to refine the operation? Generally, gold extraction is divided into three steps: the first step is calcination in a high-temperature furnace. The function of this step is to solve the capacitors, resistors and some residues in the circuit board through high-temperature calcination The second step is to dissolve by using some chemical agents, such as sulfuric acid; Many different metal materials are added in the production, and each metal material has a different melting point. It must reach a sufficient temperature to separate these metal substances layer by layer.
After completing these three steps, the gold can almost be separated, and after cooling, you can see a golden "little gold". This extraction method can not only extract gold, but also separate some other precious metals, such as silver, copper, lead, zinc, tin and other substances. Precious metal extraction from circuit boards is an important part of the e-waste recycling process and requires a complete range of precious metal extraction solutions. The above is just a general description, if you want to know more, please contact us directly. We give you detailed information and videos.
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