Research progress of coal fly ash for CO2 mineralization process
CO2 mineralization is one of the key technologies to meet the challenge of global warming and other ecological problems caused by the massive emission of greenhouse gases such as CO2,which has become a major challenge to the survival of all mankind.The energy resource endowment pattern of"relatively coal-rich,oil-poor and gas-poor"has led to the fact that China's main energy source is still dominated by coal,which has a high CO2 emission intensity,and the industrial solid waste generated from the combustion of coal fly ash also faces a huge problem of disposal.Compared with traditional mineralized raw materials,coal fly ash has received widespread attention due to its abundant reserves,easy accessibility and low transportation costs.Coal fly ash can achieve CO2 mineralization and sequestration through direct and indirect mineralization,and reduce the environmental risks associated with the accumulation or disposal of coal fly ash while CO2 mineralization and sequestration is taking place.Under the goal of carbon peaking and carbon neutrality,the use of coal fly ash to mineralize and sequester CO2 is an efficient strategy with great potential to combat global warming.The current status of coal fly ash emissions and utilization in China were described.The research progress of direct and indirect coal fly ash mineralization was reviewed,the advantages and disadvantages of different mineralization processes were compared and analyzed,the regulation mechanism of the process parameters on the efficiency of coal fly ash mineralization in the process of CO2 mineralization was clarified.In order to address the lack of mechanistic explanation of CO2 mineralization from coal fly ash,the mechanisms of gas-liquid diffusion and other mechanisms control-ling the mineralization rate during the mineralization process were clarified through the introduction of the shrinking nucleus model and the surface coverage model,which were commonly used to describe the CO2 mineralization reaction.Finally,the existing problems and future research directions of the coal fly ash mineralization process were analyzed,aiming to provide a reference for the use of coal fly ash solid waste to mineralize CO2.
CO2 mineralizationcoal fly ashdirect mineralizationindirect mineralizationmineralization mechanism
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