Mechanisms of mechanochemical activation during comprehensive utilization of high-alumina coal fly ash
Mechanisms of mechanochemical activation during comprehensive utilization of high-alumina coal fly ash
复制标题
高铝粉煤灰综合利用机械化学活化机理
DOI：
10.1016/j.wasman.2020.08.003
复制
发表时间：
2020-10-01
期刊：
影响因子：
8.1
通讯作者：
Zhu, Ganyu
中科院分区：
文献类型：
--
作者：
Yang, Chennian;Zhang, Jianbo;Zhu, Ganyu
高铝粉煤灰是一种重要的铝硅资源。在其综合利用方面，如何有效地分离铝和硅是必须解决的问题。本文采用机械力化学活化法进行脱硅研究。研究了机械力化学活化过程中的脱硅率、有效脱硅率、微观形貌以及铝硅原子配位结构的变化。结果表明，HAFA中的Al-O-Si配位结构由Q（4）（3A 1）和Q（4）（2A 1）转变为活性Q（2）（1A 1）结构，高活性Q（2）（1A 1）的比例由6.93%提高到14.47%，明显提高了HAFA的反应活性。在脱硅过程中，通过工艺优化，可将铝硅质量比（A/S）从1.23提高到2.56，为HAFA的进一步高值化利用提供了优质原料。(C)2020爱思唯尔有限公司保留所有权利。
High-alumina coal fly ash (HAFA) is an important aluminum and silicon resource. In terms of its comprehensive utilization, how to efficiently separate aluminum and silicon must be resolved. In this work, a mechanochemical activation method in the desilication process is adopted and investigated. Desilication ratio, efficient desilicated ratio, microscopic appearance, and coordination structure change in aluminum-silicon atoms are investigated during mechanochemical activation process. Results indicate that the Al-O-Si coordination structure in HAFA can be transformed from Q(4) (3A1) and Q(4) (2A1) to reactive Q(2) (1A1) structure, and the radio of Q(2) (1A1) with high activity increased from 6.93% to 14.47%, which can improve HAFA reaction activity obviously. During the desilication process, the aluminum-silicon mass ratio (A/S) can be elevated from 1.23 to 2.56 after the process optimization, which provides a high-quality raw material for further high-valued utilization of HAFA. (C) 2020 Elsevier Ltd. All rights reserved.