From Rice University via PhysOrg, October 4:
In what should be a win-win-win for the environment, a process developed at Rice University to extract valuable metals from electronic waste would also use up to 500 times less energy than current lab methods and produce a byproduct clean enough for agricultural land.
The flash Joule heating method introduced last year to produce graphene from carbon sources like waste food and plastic has been adapted to recover rhodium, palladium, gold and silver for reuse.
A report in Nature Communications by the Rice lab of chemist James Tour also shows highly toxic heavy metals including chromium, arsenic, cadmium, mercury and lead are removed from the flashed materials, leaving a byproduct with minimal metal content.
Instantly heating the waste to 3,400 Kelvin (5,660 degrees Fahrenheit) with a jolt of electricity vaporizes the precious metals, and the gasses are vented away for separation, storage or disposal. Tour said that with more than 40 million tons of e-waste produced globally every year, there is plenty of potential for "urban mining."
"Here, the largest growing source of waste becomes a treasure," Tour said. "This will curtail the need to go all over the world to mine from ores in remote and dangerous places, stripping the Earth's surface and using gobs of water resources. The treasure is in our dumpsters.".....
....MUCH MORE
You can bet that Veolia has already inquired about licensing.
