Department of Energy Resources Engineering, Stanford University, 367 Panama Street, Stanford, California 94305, United States.
Environ Sci Technol. 2013 Jul 2;47(13):7548-54. doi: 10.1021/es4003982. Epub 2013 Jun 18.
The availability of industrial alkalinity sources is investigated to determine their potential for the simultaneous capture and sequestration of CO2 from point-source emissions in the United States. Industrial alkalinity sources investigated include fly ash, cement kiln dust, and iron and steel slag. Their feasibility for mineral carbonation is determined by their relative abundance for CO2 reactivity and their proximity to point-source CO2 emissions. In addition, the available aggregate markets are investigated as possible sinks for mineral carbonation products. We show that in the U.S., industrial alkaline byproducts have the potential to mitigate approximately 7.6 Mt CO2/yr, of which 7.0 Mt CO2/yr are CO2 captured through mineral carbonation and 0.6 Mt CO2/yr are CO2 emissions avoided through reuse as synthetic aggregate (replacing sand and gravel). The emission reductions represent a small share (i.e., 0.1%) of total U.S. CO2 emissions; however, industrial byproducts may represent comparatively low-cost methods for the advancement of mineral carbonation technologies, which may be extended to more abundant yet expensive natural alkalinity sources.
研究了工业碱度源的可用性，以确定它们从美国的点源排放中同时捕获和隔离 CO2 的潜力。所研究的工业碱度源包括粉煤灰、水泥窑灰和钢铁渣。通过它们对 CO2 的相对反应活性和与点源 CO2 排放的接近程度来确定它们进行矿物碳化的可行性。此外，还研究了可用的骨料市场作为矿物碳化产品的可能汇。我们表明，在美国，工业碱性副产物有可能减轻约 7.6 Mt CO2/yr 的 CO2 排放，其中 7.0 Mt CO2/yr 是通过矿物碳化捕获的 CO2，0.6 Mt CO2/yr 是通过再利用作为合成骨料（替代砂和砾石）避免的 CO2 排放。这些减排量仅占美国 CO2 总排放量的一小部分（即 0.1%）；然而，工业副产品可能代表着推进矿物碳化技术的相对低成本方法，这些方法可能会扩展到更丰富但昂贵的天然碱度源。
