https://doi.org/10.3390/ma14164379
“The use of wastes of marble powder (WMP) and dolomite as sorbents for CO2 capture is extremely promising to make the Ca-looping (CaL) process a more sustainable and eco-friendly technology. ”
“Table 1 shows that the WMP, such as the limestone, is mainly composed of CaO and CO2. ASTM C119-16 [54] classifies limestone and marble in different groups of rocks, marble is a carbonate rock that has acquired a distinctive crystalline texture by recrystallization, usually due to high heat and pressure during metamorphism, and is mainly composed of the carbonate minerals calcite and dolomite, individually or in combination. Dolomite belongs to the limestone group and, besides CO2, contains two main oxides in its composition: CaO and MgO. A ratio of Ca/Mg (wt.%) of 2.4 was obtained, so this sorbent is classified as a calcitic dolomite. Compared to the WMP, lower amounts of Si, Al and Fe were found in dolomite.”
“The carbonation–calcination cycles using WMP and dolomite as sorbents were performed within an in-situ XRD chamber, and the evolution of CaCO3 and CaO crystalline phases present in each one of the materials samples was recorded in the XRD diffractograms in the range 28–39° in 2θ.
