| 摘要: |
| 以粉煤灰为主要原材料，分别单掺冶金污泥(MS)和城市垃圾焚烧飞灰（MSWIFA），制备了含重金属固废地聚合物，并引入化学药剂对其进行改性，同时进行了机理研究.结果表明：冶金污泥粉煤灰(FS)地聚合物中冶金污泥的适宜处置量(质量分数，下同)为15%，最佳化学药剂为二硫代氨基甲酸盐(DTCR)；城市垃圾焚烧飞灰粉煤灰(FM)地聚合物中城市垃圾焚烧飞灰的适宜处置量为5%，最佳化学药剂为三巯基均三嗪三钠盐(TMT).化学药剂的掺入抑制了重金属的破坏作用，提高了地聚合反应程度，使产物结构更匀质、致密，提升了固化效果；采用DTCR改性、含15%MS的地聚合物试样FS 15 D和经TMT改性、含5％MSWIFA的地聚合物试样FM 5 T具有良好的抗酸碱侵蚀性能. |
| 关键词: 地聚合物 粉煤灰 含重金属固废 化学药剂 |
| DOI：10.3969/j.issn.1007 9629.2016.06.004 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51478328)；中央高校基本科研业务费专项资金资助项目(0500219225)；同济大学大型仪器设备开放测试基金资助项目(0002015008) |
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| Modification of Geopolymers Containing Heavy Metals Solid Wastes by Chemical Agents and Its Mechanism |
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GUO Xiaolu1, WU Liang2, ZHANG Liyan2, SHI Huisheng1
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1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China;2.School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
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| Abstract: |
| Heavy metals solid waste based geopolymers were prepared from the major material of fly ash(FA), and metallurgical sludge(MS) or municipal solid waste incineration fly ash(MSWIFA). Mechanism and modification of geopolymers by chemical agents were explored. The results show that the optimal content(by mass) of metallurgical sludge is 15% for FS(metallurgical sludge fly ash) geopolymer, and the optimal chemical agent is dithiocarbamate（DTCR）. Similarly, for FM(municipal solid waste incineration fly ash fly ash) geopolymer, the optimal content(by mass) of MSWIFA is 5%, and the optimal chemical agent is trimercapto s triazine trisodium salt(TMT). With the addition of chemical agent, it restrains the destruction caused by heavy metals, improves the degree of geopolymerization, making the products more homogeneous and compact, and promotes the solidification effect. The geopolymer containing 15% MS and modified by DTCR(sample FS 15 D), and the geopolymer containing 5% MSWIFA and modified by TMT(sample FM 5 T) show good resistance to acid and alkaline attack, which contain heavy metals solid wastes and are modified by chemical agents. |
| Key words: geopolymer fly ash solid waste contained heavy metal chemical agent |
