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脱铝粉煤灰水热法合成1.1 nm 铝代托贝莫来石
作者:杨敬杰1 2 孙红娟1 岳焕娟1 彭同江1  冰1 2  艳1  强1 
单位:1. 西南科技大学 固体废物处理与资源化省部共建教育部重点实验室 四川 绵阳 621010  2. 西南科技大学城市学院 四川 绵阳 621010 
关键词:脱铝粉煤灰 铝代托贝莫来石:水热法 取代 
分类号:X753
出版年,卷(期):页码:2017,45(11):0-0
DOI:10.14062/j.issn.0454-5648.2017.11.20
摘要:
以H2SO4、(NH4)2SO4 为焙烧助剂对粉煤灰进行焙烧-水浸处理,提取粉煤灰中Al 组分,其剩余的残渣作为一种二次
废弃物保留了大量的非晶态SiO2 组元,以提取铝组分后富含非晶态SiO2 的残渣为原料,首先在Ca、Si 摩尔比为0.5、0.67、
0.83、1.00、1.16 条件下调配CaO–Al2O3–SiO2–H2O 体系凝胶,在探索最佳水热条件制备出铝代托贝莫来石的同时深入研究
其形成机制,并对合成的系列1.1 nm 铝代托贝莫来石粉体进行表征。结果表明:在水热反应环境(180 ℃,24 h)下,凝胶不断
晶化,随着体系温度升高至240 ℃,在形成的莫来石晶体结构当中发生了Al 对Si 的同型取代,伴随着反应温度继续升高,
1.1 nm 铝代托贝莫来石可进一步转化为加藤石。
Coal fly ash (CFA) that is dealuminated using H2SO4 and (NH4)2SO4 via a binary mixture roasting technology is one type
of secondary solid waste. Amorphous SiO2 is a valuable and abundant material associated with it. This study describes the preparation
of Al-substituted 1.1 nm tobermorite based on the dealumination of CFA. The CaO-Al2O3-SiO2-H2O system was used for the
preparation of different Ca/Si molar ratios of 0.5, 0.67, 0.83, 1.00 and 1.16. The Al-substituted 1.1 nm tobermorite crystallizes from
the CaO-Al2O3-SiO2-H2O system during hydrothermal reactions. The influence of different hydrothermal temperatures and
hydrothermal times was examined. The results indicate that the dealuminated CFA constituents were converted into well-crystallized
Al-substituted 1.1 nm tobermorites under hydrothermal conditions of 180 °C for 24 h, and katoite could be synthesized at a higher
hydrothermal temperature of 240 °C. Al3+ is inserted into tobermorite and plays a stabilizing role during the hydrothermal reaction.
Al-substituted 1.1 nm tobermorites converted in katoite with temperature increasing.
基金项目:
西南科技大学重点科研平台项目(14tdgk02)
作者简介:
杨敬杰(1989—),男,硕士研究生
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