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

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

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


The  increasing anthropogenic CO2  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 CO2 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 (con- stant temperature pressurized reaction chamber (CTPRC)) to study the effects of different initial param- eters on  mineral carbonation such as  different initial water-binder ratio, initial sample porosity and initial carbon dioxide pressure. The  experimental results show that the CO2  consumption ratio is  ۱۵%,

۱۰%  and 7% higher with relatively high initial water-binder  ratio, initial sample porosity and initial

CO2  pressure within 48 h. In addition, some physical and chemical evidence was found through the elec- tron microscope scanning and XRD test to further explain the above test results. This  proposed research will  provide critical parameters for optimizing CO2  sequestration capacity in this cementitious backfilling material with forming agent.

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  1. Introduction

In the process of burning fossil  energy such as coal, a large num- ber   of  greenhouse gases such as  carbon dioxide are   inevitably emitted, and the coal  energy industry contributes to  the majority of  carbon dioxide atmospheric  emissions. Based   on  the under- standing  of  current  climate  change, reducing  the  emission  of greenhouse gases on  a  global scale and thus reducing the global greenhouse  effect is  the  most critical work in  current  climate change mitigation actions. Therefore, technologies to  reduce greenhouse gas  levels in  the atmosphere are   crucial to  climate change mitigation actions.

At present, there are  several methods to control carbon dioxide emissions [1]: the first  method is to  reduce carbon dioxide emis- sions by improving the energy efficiency, but the promotion of this measure is limited by various factors such as technological devel- opment level  and economic development. Therefore, the effect of reducing carbon dioxide emissions by solely by improving energy efficiency will  be  very  limited in the future. The  second approach is  to  create  low-carbon energy sources. At  present, low-carbon

energy that  can   be   utilized  by   human beings includes water energy, wind energy, solar energy, hydrogen, geothermal energy and so  on.  However,  these low-carbon energy sources have their limitations, so  they will   be  unable to  replace traditional  fossil energy in  the energy structure in  the coming decades. The  third method is to improve the technology of comprehensive utilization and treatment of carbon dioxide [2].  That  is, to  recover and sepa- rate the carbon dioxide generated in the energy industry through physical, chemical and biological technologies and turn it  into a valuable industrial resource. However, depending on  the current level  of technology, the amount of carbon dioxide that can be com- prehensively utilized is  minimal. Compared with the enormous global carbon dioxide emissions, this method can  only  reduce car- bon  dioxide emissions to  a  certain extent and cannot effectively reduce the total amount of carbon dioxide emitted into the atmo- sphere [3]. The fourth method is exploited by the ocean to dispose of  carbon  dioxide. In  principle, this  method  can   store a  large amount of carbon dioxide, but the process of ocean storage of car- bon  dioxide is prolonged, and the factors affecting ocean storage of carbon dioxide are  incredibly complex, and the current technology level   cannot be  achieved. The  fifth   method is  to  utilize under- ground space such as unrecoverable coal seams, abandoned mines, and abandoned oil (gas)  fields to store carbon dioxide geologically

[۴]. Studies have shown that the global underground area available for storing carbon dioxide is about 7.0     ۱۰۷ square kilometers, can accommodate carbon dioxide is about 1.0     ۱۰۱۴–۲٫۰    ۱۰۱۴  tons [5]. Moreover, the technical level  required for the implementation of this storage method is not  superior, the storage cost  is low,  and the implementation is relatively easy. Therefore, this method will be  the most convenient and effective method to  address carbon dioxide.

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