“The heart of the Calera process is the formation of novel, metastable calcium and magnesium carbonate and bicarbonate minerals, similar to those found in the skeletons of marine animals and plants, by capturing carbon dioxide from flue gas and converting the gas to stable solid minerals. We refer to this novel process as Mineralization via Aqueous Precipitation, or MAP for short. In its simplest form MAP involves contacting gas from the power plant with natural waters found in abundance on Earth. Many of the crystallographic forms Calera synthesizes are previously undescribed, or poorly known. These novel ‘polymorphs’ make it possible to produce high reactive cements, and aggregate precursors, with bulk chemistries that would usually be relatively inert.” – Excerpted from Calera’s website, 2015
Key Differentiators
Calera estimates that for every ton of cement produced using their method instead of the traditional one, half a ton of CO2 is sequestered.
Challenges Solved
Traditionally, the production of cement requires heating limestone to 2,640 degrees F. The heating process uses fossil fuels, and releases CO2 previously locked up on a geological time scale. Calera’s process sequesters CO2 instead of releasing it, making it not just carbon neutral, but even carbon negative.
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This is wonderful. A company Called Solidia Technologies located in NJ is also changing the cement game. Sequestering CO2, only having a cure time of 24hrs and reusing the same recycled water to cure pavers.
Hope the cement industry catches on like these two companies to help combat climate change!
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