mechanical treatment method is a method for recycling of scrap metal-based circuit boards. The process generally includes pretreatment, crushing and separation, specifically, a pretreated metal-based circuit board is mechanically broke and crushed, fully dissociate the metal and non-metal in the metal base circuit board, then, based on the different of density, electrical conductivity, and magnetic properties, separate the printed circuit board particles with different properties by physical technology.

   Chemical solvent method used to recover rare metals from waste circuit boards, which is to use concentrated sulfuric acid to dissolve waste metal based PCB, to obtain rare metal stripping precipitate and waste acid solution of copper or other metals, Rare metals such as gold and silver can be obtained from metal stripping by reduction treatment. Chemical solvent treatment of scrap metal based PCB, Products are mostly single metal, no need to separate again, but it costs a lot of money and produces a lot of toxic and corrosive water, gas and residue, easy to cause secondary pollution. Pyrolysis process is to waste metal based circuit board in anoxic or anaerobic conditions, crack,by heating the metal-based PCB, it breaks down into gas, liquid and solid products. 

   In this process, the pretreated printed circuit board is crushed first, And then it's pyrolyzed by heated to a certain temperature in a reactor , Polymeric materials like epoxy resins are converted into small molecules of hydrocarbons, After this pyrolytic oil and gas is discharged , non-condensable gas and liquid pyrolytic oil are obtained by condensation.,Can be reused after purified respectively. The rest of the solid is a mixture of metal, fiberglass and ceramics, it can be separated and recycled or used in the production of composite materials.