西安科技大学安全科学与工程学院;西安科技大学西部矿井开采及灾害防治教育部重点实验室;
碱活化粉煤灰结构特征直接影响其与CO_2的矿化反应能力,研究碱活化粉煤灰对CO_2的矿化性能是突破煤基固废粉煤灰对CO_2矿化封存效率的关键.以石家庄燃煤电厂褐煤粉煤灰为研究对象,通过激光粒度仪、扫描电镜-能谱仪和红外光谱仪测试,探究不同碱浓度条件下碱活化粉煤灰结构特征.基于高温高压搅拌反应釜矿化试验平台以及热重试验分析,研究碱活化粉煤灰对CO_2的矿化性能.试验结果表明:碱活化会造成粉煤灰颗粒破碎分解,导致粉煤灰粒径分布降低.微观尺度下粉煤灰呈规则球状颗粒,碱活化造成粉煤灰细化,暴露更多活性Ca元素有利于矿化固碳.碱活化粉煤灰中铝氧四面体或硅氧四面体网络结构破坏,粉煤灰颗粒表面覆盖硅酸钙水化物凝胶(C-S-H凝胶),且C-S-H凝胶具有较高Si—O聚合度.碱活化可有效提升粉煤灰矿化固碳性能,碱处理浓度为15%时,褐煤粉煤灰矿化固碳性能最优,CO_2吸收量达到8.9 g/kg, Ca的转化率达到27.8%,相比于未活化粉煤灰CO_2吸收量提升71.2%,Ca的转化率提升70.6%.
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基本信息:
DOI:10.13247/j.cnki.jcumt.20240359
中图分类号:X701;X773
引用信息:
[1]秦雷,吝思恒,林海飞等.碱活化对粉煤灰结构及矿化性能的影响[J].中国矿业大学学报,2025,54(02):437-447.DOI:10.13247/j.cnki.jcumt.20240359.
基金信息:
中国科协青年人才托举工程项目(2022QNRC001); 陕西省青年人才托举计划项目(20220437); 西安科技大学优秀青年科技基金项目(2024YQ2-03)