Preparation of sintered foamed ceramics derived entirely from coal fly ash
Preparation of sintered foamed ceramics derived entirely from coal fly ash
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DOI：
10.1016/j.conbuildmat.2017.12.102
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发表时间：
2018-02
影响因子：
7.4
通讯作者：
Yang Luo;S. Zheng;Shuhua Ma;Chunli Liu;Xiaohui Wang
中科院分区：
文献类型：
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作者：
Yang Luo;S. Zheng;Shuhua Ma;Chunli Liu;Xiaohui Wang
以粉煤灰为主要原料，成功地合成了一种新型泡沫陶瓷.在烧结之前，CFA用碱活化进行预处理，其用羟基方钠石晶体层均匀地涂覆CFA颗粒。由于预处理，碱活化CFA在烧结过程中经历了自发泡反应。当烧结温度为1200 °C时，泡沫陶瓷的表观密度为0.41 g/cm 3，气孔率为83.60%，抗压强度为8.3 MPa，导热系数为0.0983 W/m·K。浸出毒性试验表明，有害重金属在烧结过程中被包裹在玻璃相内。
A new foamed ceramic was successfully synthesized entirely from coal fly ash (CFA). Before sintering, the CFA was pretreated with an alkali activation that evenly coated CFA particles with a layer of hydroxysodalite crystals. Because of the pretreatment, the alkali activated CFA underwent a self-foaming reaction during sintering. When sintered at 1200 °C, the foamed ceramics exhibited optimal properties, including an apparent density of 0.41 g/cm3, porosity of 83.60%, a compressive strength of 8.3 MPa, and thermal conductivity of 0.0983 W/m·K. The leaching toxicity tests revealed that the hazardous heavy metals were encapsulated within the glassy phases during sintering.