Recycling waste multilayer ceramic capacitors (MLCCs) is significant for environmental protection and resource recovery, which contain rich precious metals including palladium and silver. The existing recycling methods have many shortcomings such as environmental pollution, low recovery efficiency and low purity of precious metals.
Palladium content in ceramic capacitors is significantly higher than Pd content in primary ores from which it is extracted (on average < 10 g/t) [ 35 ], then using secondary Pd as feedstock reduces energy consumption in addition to conserving resources. Other PGMs like platinum and iridium are present only in trace amounts.
Most e-scrap digital electronic printed circuit boards contain trace amounts of Palladium in monolithic ceramic capacitors but this Palladium is possibly the most overlooked e-scrap recycler resource. A monolithic ceramic capacitor contains Palladium or a mix of Silver and Palladium.
One often overlooked source for the precious metal Palladium is the monolithic ceramic capacitors that reside on printed circuit boards. Am e-scrap recycler who collects a large quantity of these capacitors could send them to a processor or extract the metal in a home lab.
Two alternatives exist for the recycler to take advantage of the Palladium content of monolithic ceramic capacitors. The first alternative comprises selling e-scrap circuit boards to board processors or arranging a sort of assay process. The second alternative is for the recycler to process the circuit boards.
Like gold, there are ways for a home chemist to reclaim Palladium. However, the Palladium content of e-scrap is limited to the Palladium contained in the monolithic ceramic capacitors contained on printed circuit boards. Palladium and other platinum related precious metals are normally collected and sold in either a powder, salt, or button form.
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Palladium
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