Work

CO2 sequestration characteristics in the cementitious material based on gangue backfilling mining method

Year: 2019

Type: article

Abstract: The increasing anthropogenic CO 2 emission and global warming has challenged the China and other countries to seek new and better ways to meet the world’s increasing need for energy while reducing greenhouse gas emissions. The overall proposition of this research is to develop a brand-new CO 2 physical and chemical sequestration method by using solid waste of coal mining and cementitious material which are widely used for goaf backfilling in coal mining. This research developed a new testing system (constant temperature pressurized reaction chamber (CTPRC)) to study the effects of different initial parameters on mineral carbonation such as different initial water-binder ratio, initial sample porosity and initial carbon dioxide pressure. The experimental results show that the CO 2 consumption ratio is 15%, 10% and 7% higher with relatively high initial water-binder ratio, initial sample porosity and initial CO 2 pressure within 48 h. In addition, some physical and chemical evidence was found through the electron microscope scanning and XRD test to further explain the above test results. This proposed research will provide critical parameters for optimizing CO 2 sequestration capacity in this cementitious backfilling material with forming agent.

Source: International Journal of Mining Science and Technology

DOI: 10.1016/j.ijmst.2019.03.005

Authors: Peng Wang, Xianbiao Mao, Shen-En Chen

Institutions: China University of Mining and Technology, University of North Carolina at Charlotte

Language: English

Topic: CO2 Sequestration and Geologic Interactions

Subfield: Environmental Engineering

Field: Environmental Science

Domain: Physical Sciences

SDGs: Responsible consumption and production, Climate action

Open Access status: diamond

Funders: National Natural Science Foundation of China, China University of Mining and Technology, Key Laboratory of Coal-based CO2 Capture and Geological Storage, Jiangsu Province