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Flash Joule Heating Reactor
Flash Joule Heating Reactor
technology application

Flash Joule Heating Reactor

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updatedNov 24, 2022
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Wesley Tingey @ unsplash.com

By grinding e-waste and heating it with an intense pulse of electric current, this reactor can recover precious metals more sustainably and energy-efficiently than other urban mining processes. It can also be used to produce graphene in bulk from sources like food waste and plastic, showing its potential for a circular economy.
By grinding e-waste and heating it with an intense pulse of electric current, this reactor can recover precious metals more sustainably and energy-efficiently than other urban mining processes. It can also be used to produce graphene in bulk from sources like food waste and plastic, showing its potential for a circular economy.

By instantly heating e-waste with an ultrafast jolt of electricity, this reactor can recover precious metals such as gold, silver, rhodium, and palladium for reuse, facilitating urban mining and recycling practices in a circular economy. The process is called evaporative separation, and it is solvent-free, more energy-efficient, and faster than current urban mining practices such as smelting and leaching.

First, it is necessary to crush and grind the circuit boards and add them to the reactor. The flash chamber then electrically heats this e-waste powder to 3,400 Kelvin (3,126 degrees Celsius). In less than a second, the metals are vaporized and then transported, under vacuum, into a cold trap, another vessel where the gasses condense into their constituent metals. They can then later be further refined to individual metals using other well-established purification processes.

This approach removes highly toxic heavy metals like arsenic, cadmium, chromium, lead, and mercury, leaving the remaining char with minimal metal contents, deemed safe enough for agricultural soils. This reactor was originally created to produce graphene in bulk from sources like food waste and plastic.

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2 technology domains
4 industries
  • Communications
  • Environment & Resources
  • Media & Interface
  • Manufacturing & Production
5 topics
  • Waste Management and Circular Economy, Resource Efficiency
  • Urbanization
  • Green Economy
  • Natural Resources
  • Mitigation of Green House Gas Emissions
3 SDGs
  • 09 Industry, innovation and infrastructure
  • 11 Sustainable Cities and Communities
  • 13 Climate Action