2 results for group: amanda-stubbs
Evaluating feedstocks for carbon dioxide removal by enhanced rock weathering and CO2 mineralization
Carlos Paulo, Ian M.Power, Amanda R.Stubbs, Baolin Wang, Nina Zeyen, Siobhan A.Wilson
Abstract
Mineralogically complex feedstocks, including kimberlite, serpentinite, and wollastonite skarns, have vast capacities to sequester carbon dioxide (CO2) through enhanced rock weathering and CO2 mineralization. However, only a small reactive fraction of these feedstocks will be accessible for carbon dioxide removal at Earth’s surface conditions. We have developed a new method to evaluate the reactivity of mineral feedstocks that consists of a batch leach test using CO2 coupled with total inorganic carbon (TIC) analysis to quantify easily extractable Mg ...
Direct measurement of CO2 drawdown in mine wastes and rock powders: Implications for enhanced rock weathering
Amanda R.Stubbs, Carlos Paulo, Ian M.Power, Baolin Wang, Nina Zeyen, Siobhan A.Wilson
Abstract
Enhanced rock weathering (ERW) sequesters CO2 via solubility and mineral trapping and can be implemented by the mining industry to reduce their net greenhouse gas emissions. Kimberlite residues from Venetia Diamond Mine in South Africa, as well as powdered forsterite, serpentinite, wollastonite skarn, and 10 wt.% brucite mixed with quartz sand, were tested as potential feedstocks for ERW. A CO2 flux system directly measured CO2 removal rates and sensors tracked laboratory conditions and pore water saturation during a series of 2-week experiments. With ...
