Archives in Chemical Research Open Access

Thorough CO2 capture and conversion by accelerated mineral carbonation processes with Ca2+, Mg2+ //Cl- system

7^th Edition of International Conference and Exhibition on Separation Techniques

July 05-07, 2018 Berlin, Germany

Yingying Zhao

Hebei University of Technology, China

Scientific Tracks Abstracts: Arch Chem Res

Abstract:

This study promotes a two-step accelerated mineral carbonation technology at moderate temperature and atmospheric pressure, by choosing the problematic ions for seawater utilization as mineralizers, that is, Ca2+ as the first mineralizer and Mg2+ in the residual solution as the second. Therefore, not only carbonate ions generated from the absorption and ionization of CO2 can be fixed by Ca2+ through first carbonation process with the added alkali source MgO, but also HCO3- in the residual solution can be mineralized by Mg2+ through second carbonation process with the added NaOH. Meanwhile, pure CaCO3 and MgCO3•3H2O with possible beneficial reuse can be obtained as by-products. Moreover, softened water is beneficial for long-term stable equipment operation, energy saving and the reduction of economic cost for the following desalination. The corresponding mechanism for first carbonation by ionizing magnesia was presumed according to ions concentration changes, precipitants conversion. Then more variables were set to optimize technical conditions. Under the optimum condition, decalcification rate can reach above 92.0%, carbon sequestration changes from 30% and 50%, and the reaction time is only 10 mins with pure CaCO3 as by-product. In the second carbonation process, the carbonation of residual HCO3- by Mg2+ was realized by adding NaOH, and the magnesium extraction can reach about 75% with pure MgCO3•3H2O as another by-product.

Biography :

Doctor Zhao is the associate professor of Hebei University of Technology. She previously studied at Tianjin University (China) from 2007.09 to 2012.01 and during this period she had been to the University of Western Ontario (Canada) at Department of Chemical and Biochemical Engineering as a visiting scholar from 2010.08 to 2011.08. Now, she is the department head of marine technology at Hebei University of Technology. From 2012 to now, she has directed 1 Scientific Research Project at nation level, 4 Provincial and Ministerial Project, 1 other Key Project, and 2 other Industrial Project. And she has participated in 4 Scientific Research Project at nation level, 1 Provincial and Ministerial Project, 2 other Key Project, and 1 other Industrial Project. Meanwhile, she has published 5 issued patents and more than 20 academic papers with the citation frequency more than 50. Associate professor Zhao’s research interests in seawater resources utilization and environmental protection. The focus of her current research is on seawater decalcification, extraction of potassium from seawater, CO2 capture, mineral carbonation, seawater desulfuration, separation technology of inorganic salts, and industrial crystallization.

E-mail: luckyzhaoyy@126.com