Testing and Validating Instruments for Feedstocks of Mineral Carbonation

Abstract

Different feedstocks Dunite, Olivine and Lizardite are examined in this research using various measuring techniques such as TGA-MS, XRD and Quantitative XRD and EDS. Quantitative XRD results matched with TGA-MS results. Malvern Mastersizer, EDS and QXRD results also showed a good match regarding the individuality of results which are shown graphically. TGA-MS calibration curves example is provided. Matching the results of different measuring techniques is a key to fundamental research. Comparison of the reactivity of dunite, soaked dunite, heat-activated dunite and lizardite and raw dunite soaked has been performed. TGA-MS and QXRD results match each other. Malvern Mastersizer, EDS and QXRD results match with their individual results indicating the instrument’s reliability. Semi-Quantitative XRD results authenticity is EXCELLENT. TGA-MS results match with QXRD is excellent. Mineral carbonation converts CO2 into stable mineral carbonates. This research explores the utilisation of serpentinised dunite (which is comprised of 61% lizardite) as a potential feedstock for mineral carbonation. Heat activation, ex-situ regrinding and concurrent grinding techniques were employed to enhance the reaction rate and yield, and to provide information on the carbonation reaction mechanism. Silica-rich layers that appeared during reference experiments were disrupted using concurrent grinding and significantly higher magnesite yields and Mg extractions were obtained.

Carbon capture, utilization and storage opportunities to mitigate greenhouse gases

“…Mineral carbonation is a mature technology and permanent CO 2 storage. Single stage carbonation [ [31] , [32] , [33] , [34] , [35] , [36] ], two stage carbonation [ [37] , [38] , [39] ] and acid dissolution [ [40] , [41] , [42] ] are all currently being investigated. The by-products and minerals feed can also be used in cement production [ 40 ].…”

“…Direct air capture (DAC) is another emerging technology for CO 2 capture. CO 2 concentration in air has reached 419 ppm due to anthropogenic CO 2 emissions into atmosphere [ 34 ]. DAC process enables CO 2 capture from atmosphere thus helping in circular economy.…”