How to solve the problem of waste printed circuit board pollution

Printed circuit board as an important part of electronic products. Its composition is complex, high hardness, toughness, containing a variety of valuable metals and a variety of harmful substances, its resource has been the field of e-waste resource disposal problems. Shenzhen PCB circuit board manufacturers in order to solve the waste printed circuit board crushing process of secondary pollution problems, including waste gas and dust pollution invented a wet crushing is the use of water as a pulverizing medium used to achieve the printed circuit board broken. Low-temperature crushing technology has also begun to be used in the destruction of printed circuit boards. Eddy-flow sorting is a method of sorting metal and non-metallic parts of waste printed circuit boards.

With the economic development and scientific and technological progress, the number of discarded electronic products in a straight upward trend, a large number of discarded printed circuit board electronic products on the one hand caused great harm to the environment, on the one hand and a waste of valuable resources, especially precious metals. This situation has aroused great concern from governments, environmentalists and business circles around the world. Some countries and regions have taken effective measures to do a lot of work in laws and regulations, recycling systems and recycling technology research and development.

Shenzhen PCB circuit board manufacturers from the current level of research and depth of view, the use of "mechanical separation + wet metallurgical recycling" process to deal with discarded printed circuit boards can be achieved in the short term industrial production advantages, but its overall process optimization And the production process of environmental pollution prevention and control is still the focus of future research

Hydrogen metallurgy technology recycling waste printed circuit board in the valuable metal is the use of valuable metal in the circuit board in nitric acid, aqua regia and other strong oxidizing medium dissolved into the liquid phase characteristics, so that most of the precious metals and The other metal enters the liquid phase and separates it from the other phases, and then recovers the various metals from the liquid phase. The use of hydrometallurgical technology in the recovery of waste printed circuit board metal, the need to dismantle, select (large visible metal, excluding precious metal parts), crushed (usually after the crushing of powder metal and non-metallic separation) Process, and then chemical leaching of precious metals or other valuable metals. Therefore, the hydrometallurgical technology can be used as a mechanical physics to deal with the follow-up process of discarded circuit boards.

There is the use of "whirlwind vortex separation" principle, independent research and development of "waste printed circuit board complete physical recovery equipment", the effective realization of metal and non-metallic separation, and non-metallic powder for further material of the usual printed circuit board The main part is made of thermosetting epoxy resin glass fiber composite material, this material not only has the characteristics of insoluble and non-melting, but also contains high concentrations of brominated flame retardants, heavy metals and other harmful ingredients, to the regeneration Use to bring great difficulties. At present, most of the recycling is limited to the metal part, landfill and incineration is still the main way to dispose of waste. Heat treatment mainly includes incineration, vacuum cracking, direct smelting and so on.

Incineration is the first electronic printed circuit board waste broken to a certain size, into an incinerator burning, the organic components of which decomposition, so that the gas and solid separation. After the incineration of the residue is exposed metal or its oxides and glass fiber, after crushing by physical and chemical methods were recovered. The organic components containing the gas are discharged into the secondary incinerator after the combustion treatment

Pyrolysis is also called dry distillation in industry. Is the electronic printed circuit board waste placed in the container in the air under the conditions of heating, so that the organic matter is decomposed into oil and gas, collected by condensation after recovery, metal and glass fiber and other components of the basic nature of the material does not change, leaving In the reactor as a solid residue, using a simple physical method can be separated from the recovery. Unlike the incineration of electronic waste, the vacuum pyrolysis process is carried out under anaerobic conditions, so that dioxin, furan production, less exhaust gas generation, and environmental pollution can be prevented.

The basic principle of the chemical treatment method is to utilize the chemical stability of the various components of the waste printed circuit board to make the waste printed circuit board resource-based method. This method by the metal enrichment or broken circuit board after the liquid, and then through the multi-level chemical reaction to gradually extract the various metals in the process of recovery.