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Increased Sustainability of Carbon Dioxide Mineral Sequestration by a Technology Involving Fly Ash Stabilization

機譯：通過粉煤灰穩(wěn)定化技術提高二氧化碳固存的可持續(xù)性

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Mineral carbonation, involving reactions of alkaline earth oxides with CO2, has received great attention, as a potential carbon dioxide sequestration technology. Indeed, once converted into mineral carbonate, CO2 can be permanently stored in an inert phase. Several studies have been focalized to the utilization of industrial waste as a feedstock and the reuse of some by-products as possible materials for the carbonation reactions. In this work municipal solid waste incineration fly ash and other ashes, as bottom ash, coal fly ash, flue gas desulphurization residues, and silica fume, are stabilized by low-cost technologies. In this context, the CO2 is used as a raw material to favor the chemical stabilization of the wastes, by taking advantage of the pH reduction. Four different stabilization treatments at room temperature are performed and the carbonation reaction evaluated for three months. The crystalline calcium carbonate phase was quantified by the Rietveld analysis of X-ray diffraction (XRD) patterns. Results highlight that the proposed stabilization strategy promotes CO2 sequestration, with the formation of different calcium carbonate phases, depending on the wastes. This new sustainable and promising technology can be an alternative to more onerous mineral carbonation processes for the carbon dioxide sequestration.
機譯：作為一種潛在的二氧化碳螯合技術，涉及堿土金屬氧化物與CO2反應的礦物碳酸化已經(jīng)引起了極大的關注。確實，一旦轉化為碳酸鹽礦物，CO2便可以永久保存在惰性相中。一些研究集中于利用工業(yè)廢料作為原料，以及將某些副產(chǎn)物作為碳酸化反應的可能材料進行再利用。在這項工作中，城市垃圾焚燒飛灰和其他灰燼（如底灰，煤飛灰，煙氣脫硫殘渣和硅粉）通過低成本技術得以穩(wěn)定。在這種情況下，通過利用pH值降低的優(yōu)勢，將CO2用作原料，有利于廢物的化學穩(wěn)定。在室溫下進行四種不同的穩(wěn)定化處理，并評估碳酸化反應三個月。結晶碳酸鈣相通過X射線衍射（XRD）圖的Rietveld分析進行定量。結果表明，擬議的穩(wěn)定化策略可促進二氧化碳的封存，并根據(jù)廢物形成不同的碳酸鈣相。這項新的可持續(xù)性和有前途的技術可以替代二氧化碳封存的更繁重的礦物碳酸化工藝。

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