4 ms·

That works for some processes (making aluminum and more recently steel) but I'm not aware of any electrically heated processes for making concrete. Cheap, clea

• nine_k 4y ago
  Heating by electricity is not a problem. But both production and setting of concrete chemically produce CO2.
  • bbojan 4y ago
    Hydraulic cement does not produce CO2 during setting. Non-hydraulic cement actually consumes CO2 while setting.
    • wiml 4y ago
      Doesn't it essentially just re-absorb the same co2 it emitted when it was made?
      • bbojan 4y ago
        Yes. I was replying to parent's comment that concrete produces CO2 when setting, which is clearly not the case for hydraulic cement.
• HPsquared 4y ago
  Probably, like for steel production, it would involve producing hydrogen then using that as a heat source.
• tetrep 4y ago
  I read an article about this recently and there's at least one company working on exactly such a process: > Swedish green-tech firm SaltX Technology demonstrated that it can produce clinker with its Electric Arc Calciner: a proprietary system similar to the plasma torches widely used by automakers and other manufacturers for cutting metal. Plasma torches pass an electric current through a jet of inert gas, typically nitrogen or argon, which ionizes the gas and heats it to temperatures over 20,000 degrees Celsius. In June, SaltX announced a partnership with the Swedish limestone supplier SMA Mineral to accelerate commercialization of its technology. Article: https://arstechnica.com/science/2022/11/the-road-to-low-carbon-concrete/ https://arstechnica.com/science/2022/11/the-road-to-low-carb...