摘要
概要介绍了一种无机聚合物———地质聚合物。首先对地质聚合物材料的制备过程作了介绍。根据原料的不同,地质聚合物材料的制备可以有两种途径:一种是以偏高岭石为基础原料,一种是以粉煤灰为主要原料。通常以硅酸钠水溶液作为单体硅源,氢氧化钠溶液作为碱激发剂以提高原料的溶出性。对某些在常温和低于100 ℃下制备的独石材料作了介绍。对煅烧高岭石,叶蜡石,粉煤灰和钢渣的溶出特性作了阐述。应用SEM EDX,对以粉煤灰为原料的地质聚合物材料的化学组成作了分析。最后对地质聚合物材料的经济性以及在环境保护等领域的应用前景,特别是在减少二氧化碳排放与废弃物处理方面的意义作了介绍。
In this paper, one of the inorganic polymers called geopolymer is briefly introduced. The preparation of geopolymeric materials is reviewed. Currently there are two streams of geopolymer techniques in view of fillers. One is metakaolin-based and the other is fly ash-based. Generally, sodium silicate solutions are used for monomer sources added with caustic soda solutions for activation of leaching out of fillers. Secondly, some examples of monoliths are overviewed, which were cured at room temperature and at elevated temperature less than 100 ℃. Thirdly, elution properties of calcined kaolin and pyrophyllite as well as fly ash and blast furnace slag are mentioned. Fourthly, chemical compositions of binder portions studied for a fly ash filler are shown, employing SEM-EDX data. Finally, future visions of geopolymer techniques are predicted on the basis of present economic and environmental circumstances, especially on carbon dioxide emission and waste problems affecting modern society.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2005年第1期206-213,共8页
Earth Science Frontiers
关键词
地质聚合物
水玻璃
废弃物
固结
环境
geopolymer
water glass
wastes
solidification
environment
