我国粉煤灰产生量大、综合利用率低、环境危害严重，申请人基于粉煤灰高值资源化技术及机理研究的迫切需求，创新性地提出了以协同回收硅铝元素为核心、硅铝产品功能化应用为驱动的粉煤灰资源化理念。拟开展粉煤灰协同回收硅铝元素、合成有序介孔纳米材料的基础性和前瞻性研究：研发碱溶解-石灰石烧结技术逐级、协同回收硅铝元素，阐明硅铝元素在反应体系中的迁移转化规律，协同提高硅铝回收效率；研发CO2辅助沉淀技术及设备，将捕集后CO2原位用于合成有序介孔纳米SiO2或Al2O3材料，并研究纳米材料的纯化技术和回收Na2CO3副产品的重结晶技术；研究纳米原生粒子成核聚集机理及孔隙结构的形成机制，阐明CO2在纳米颗粒形成过程中的释H+作用和模板剂作用，实现对纳米材料比表面积、孔尺寸及表面羟基的定向调控。该系列技术将在燃煤电厂内部实现粉煤灰的高值资源化和CO2的原位减排及利用，并为其产业化应用提供理论支撑。

Since the large production amount of coal fly ash, the low rate of multipurpose utilization, and the serious environmental pollution in China, it is urgently imperative to study the high-value recycling technology of coal fly ash and clarify its mechanism. For the first time, the candidate proposed an original idea for the recycling of coal fly ash, including (i) the extraction of silicon and aluminum, and (ii) the functional applications of synthesized nano materials. In this work, the fundamental and perspective studies about the co-recycling of silicon and aluminum, and the synthesis of ordered mesoporous nano materials will be carried out as follows: (i) investigate the alkali dissolution method for the extraction of silicon and the limestone sinter method for the extraction of aluminum, clarify the migration and crystalline transformation rule of silicon and aluminum in the chemical reaction processes, and thus achieve the maximum extraction efficiency of both silicon and aluminum; (ii) develop the CO2-assistant precipitation technology and the special reactor, introduce the purified CO2 into the synthesis of ordered mesoporous nano-SiO2 and nano-Al2O3, and further study the purification technique for synthesized nano materials and the recrystallization technology for recycling the by-product (Na2CO3); (iii) investigate the nucleation and aggregation mechanism of primary nano particles, and the formation mechanism of mesopore structure, clarify the H+ release role and the template role of CO2 for the growth of nano particles, and thus directionally adjust and control the specific surface area, pore size and surface hydroxyl group of synthesized nano materials. These series of technologies could not only achieve the high-value recycling of coal fly ash, but also reduce the CO2 emission through the on-site utilization inside the coal-fired power plants; thus, this work would provide the theoretical basis and technical support for the practical application of synthesizing ordered mesoporous nano materials from coal fly ash.