| The solid residue emerged with the rapid exploitation of mineral resources formed a large amount of solid waste. The alkaline solid waste, including tailing, flyash, slag, mineral waste residue, red mud and so on, can be applied in carbon capture as catcher for carbon dioxide (CO2). In this paper the carbonate tailings, slag and red mud were utilized as carbon capture agents to study the amount of carbon capture in different technological conditions. Also the change of pH and electric conductivity during the process and the result of thermodynamic calculation were studied in order to determine the best technological parameters and conditions for carbon capture. The results showed that the amount of carbon capture could reached up to15-20g/kg by dolomite tailings,190-230g/kg by red mud made by agglomeration, and160-200g/kg by slag,18-23g/kg by red mud of bayer process, respectively, with optimized technological conditions. The result of XRD and SEM analysis showed that the alkaline materials in the solid waste had reacted with CO2. The emergence and concentration increasing of calcium carbonate as well as specific surface area increasing approved that. The result of TG-DTA and FT-IR demonstrated that the physicochemical properties and microstructure of the solid waste changed because of the increasing of calcium carbonate. All the result showed that the alkaline solid waste can be applied for capture CO2in flue gas and offer a economic way for low-cost carbon emission and solid waste disposal. |
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