“We need a large enough quantity to ­recycle indium”

As indium became scarcer, prices rose, and I was commissioned by the then-leading flat-screen manufacturer and a large electronic waste recycler to develop a recovery process. We succeeded from a technological standpoint, but our process is not used commercially. China, the largest indium supplier, suddenly threw three years’ worth of global production onto the market—around 2,000 tons.

The prices nosedived, and with them the willingness to invest in our recycling technology. However, I am sure that indium will be recycled in the future. The only question is when this will become economical. Demand is expected to increase in the years ahead. More and more areas of life are becoming “smart” and the demand for screens is rising. Indium is also used in the latest photovoltaic systems. However, there is still a lack of used devices. We need a large enough quantity to make the process worthwhile. Until now, only 45 percent of electronic waste has been recycled in Germany, and the rate is even lower internationally. In my more than 35 years of recycling research I have dealt with many aspects of recycling. I’m now viewing it from the standpoint of behavioral psychology: How can we motivate people to hand in their old electronic devices?