(663b) Carbon Mineral Sequestration Integrated with the Recovery of Rare Earth Elements from Alkaline Industrial Wastes and Silicate Minerals
AIChE Annual Meeting
2018
2018 AIChE Annual Meeting
Particle Technology Forum
Fluidization and Fluid-Particle Systems for Energy and Environmental Applications
Thursday, November 1, 2018 - 12:49pm to 1:07pm
Serpentine ((Mg, Fe)3(OH)4Si3O5) is a hydrated magnesium silicate mineral which has a large enough CO2 mineralization capacity to sequester significant amounts of anthropogenic CO2. Apart from silicate minerals, alkaline industrial solid wastes are also good resources for mineral carbonation. Iron slags and steel slags are particularly interesting because aside from Ca and Mg, iron slags and steel slags can also contain other valuable metals, including Fe, Al, Cr, V, Mn, Ti and rare earth elements (REE). The integrated recovery of these elements during the mineral carbonation process can maximize the exploitation and valorization of the slags, while contributing to the reduction of CO2 emissions and the sustainable utilization of energy. In this study, the fate of REE in the iron slags and steel slags is investigated during the pH swing process for carbon mineralization. Both dissolution and carbonation kinetics of Ca and Mg in silicate minerals and slags are studied while monitoring the leaching behaviors of REEs. Additionally, the precipitation behaviors of REE are studied under various pH conditions.