It is important to recover metals from electronic waste,which contains considerable amounts of valuable non ferrous metal and precious metals.
Dear Lala,
There are some factories in the world that extract the precious metals especially gold from the electronic chips. I saw a film about a factory in Taiwan that extracts the GOLD from the electronic waste and recycle the other materials as building materials. Also, i saw a similar factory for metal recycling from electronic waste.
In fact it is required to recycle most of material used in the electronic industry not only because its necessary fro health of the environment but also for economical factors. Some traders imported the used PCs and Laptops from Europe and sold it in Egypt with lower prices which made it possible for the limited income peoples to get an old generation PCs.
On the other side,I hinted about this point and invoked the short lifetime cycle of the consumer electronic. I hold this for very bad behavior that one produces to throwing in the waste box. We have to increase the life cycle of the consume electronic products.
Please see the link:https://www.researchgate.net/post/How_do_you_find_the_rate_of_evolution_of_the_recent_advanced_technologies_like_the_PCs
Best wishes
Hydrometallurgical route which consist of various unit operations starting from leaching followed by solvent extraction or ion exchange followed by electrowinning is best way to extract various useful metals and precious metals from all type of electronic waste. Prior to hydrometallurgy e-waste should be mechanically processed to have a uniform composition like any other minerals.
For PCB the most used industrial process is the pyrometallurgical one with further leaching and selective recovery of the most valuable and concentrated metals, i.e. Cu, Au, Ag, Pd.
As Francesco Ferella explained, industrial practice for processing of the Cu reach e-waste streams represents a combination of the pyro-hydro-electro metallurgical operations, starting with the oxido-reduction smelting (converting - Fe, Sn and Pb transferred to slag), electrorefinning (Cu recovery) and hydrometallurgical processing of electrolyte (Cu, Zn, Ni, Co, recovery) and anode slime (Ag, Au, Pt recovery). This is usually performed in copper smelters. Certain lead smelters apply technologically similar processing route.
Fe reach e-waste streams (ie. magnetic fraction) are processed in steel making operations, through much more simplified pyrometallurgical processes targeted for Fe, Ni and Co valorisation, while minor elements like Zn, Pb, Ti, Ta, Ge, Ga, or In are not of interest and usually are lost in slag, slime or filter products.
In Europe, Umicore (Belgium) is the greatest final recycler for PCBs, but other big companies are New Boliden (Sweden) and Aurubis (Germany)
1- Pyrometallurgical recovery of metals such as: Au, Ag, Pt, Pd and Se, Te, and Ni.
2- Hydrometallurgical recovery of metals such as: Au, Ag, Ni, Cu, Sn and Pb.
3- Biometallurgy technique: Co, Mo, Ni, Pb, and Zn.
Please see the link below for more information: http://www.paper.edu.cn/scholar/showpdf/OUT2YNeQI
Sir you can look into
"Recycling of gold from electronics: Cost-effective use through ‘Design for Recycling" by Christian Hagelüken & Christopher W Corti,
Gold Bulletin; September 2010, Volume 43, Issue 3, pp 209–220
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