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[Oral Presentation]Investigation on CO2 Sequestration Capacity of Fly Ash Mineralization and Characteristics of Preventing Coal Spontaneous Combustion in Coal Mine Goaf
Investigation on CO2 Sequestration Capacity of Fly Ash Mineralization and Characteristics of Preventing Coal Spontaneous Combustion in Coal Mine Goaf
ID：209
Submission ID：286 View Protection：ATTENDEE
Updated Time：2024-05-15 17:41:27
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Oral Presentation
Start Time：2024-05-30 20:30 （Asia/Shanghai）
Duration：10min
Session：[S2] Safety Engineering and Occupational Health » [S2-5A] Evening of May 30th-5A
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Abstract
为有效利用粉煤灰固废，实现粉煤灰资源化利用、碳封存减排和矿山防火灭火，本文采用XRF分析了粉煤灰的成分，开展了流变实验、粉煤灰矿化CO2封存实验、热重分析实验和阻燃性能试验， 并分析了XRD和SEM工艺分析粉煤灰在矿化反应前后物理结构和形貌变化的变化。研究了粉煤灰浆的固碳能力和流动性，以及矿化粉煤灰浆对煤自燃的抑制能力。研究结果表明，CO2在矿化后以方解石的形式封存在粉煤灰表面。当使用0.5 mol/L NaHCO3作为添加剂时，粉煤灰的最佳CO2封存能力为65.12 kg/t。矿化粉煤灰浆液的流动性高于粉煤灰浆液，水灰比越低，流动性越差。水灰比为3：1的矿化粉煤灰浆具有较强的固碳能力和较高的流动性，可考虑用于矿井采空区注浆，防止火灾发生。矿化粉煤灰浆呈现出矿化效果越好，煤低温氧化阶段CO释放量越低、交叉点温度越高的规律趋势。矿化粉煤灰浆比普通粉煤灰浆具有更强的抑制煤自燃能力，为制备矿化粉煤灰浆防火材料提供了参考价值。
Keywords
Fly ash; Carbon dioxide; Mineralization Sequestration; Coal spontaneous combustion
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