高铝粉煤灰深度脱硅制备高牌号莫来石耐火材料机理研究

Faced on the significant demand of large scale elimination and high value-added utilization of high-alumina fly ash resources, the project aims at the problems of low Al/Si, complex mineral structure and high impurity content, by using the research methods of hydrometallurgy- chemism-physical chemistry. Towards the deep desilication process of high alumina fly ash, the key scientific problems, such as distribution of mineral structure, reaction mechanism of complex minerals, control mechanisms of chemical activation and medium circulation, and regulation of product property, need to be systematically studied to setup the novel process and methods on the reaction behavior of pre-desilication- regulation of chemical activation-reaction mechanisms of deep desilication- regulation of product property- acid & alkali medium circulation. Further, form application technology on the preparation of mullite from high alumina fly ash by deep desilication way. This research will provide both theoretical basis and technical support for the high-efficiency and clean utilization for typical high-alumina fly ash in China.

本项目面向高铝粉煤灰大规模消纳和高值化利用的重大需求，针对其铝硅比低、矿相结构复杂、杂质含量高的问题，采用湿法冶金－化学化工－物理化学等研究方法，针对高铝粉煤灰深度脱硅过程，通过开展高铝粉煤灰矿相结构嵌布特征、复杂矿相脱硅反应机理、化学活化调控规律、介质再生循环控制及产品性能调控等关键科学问题的研究，系统建立高铝粉煤灰预脱硅反应行为-化学活化调控规律-深度脱硅反应机理-产品性能调控-酸碱介质循环的新过程、新方法，形成高铝粉煤灰深度脱硅制备高牌号莫来石的应用技术，为实现高铝粉煤灰铝硅资源综合利用提供理论基础与技术支撑。

本项目面向高铝粉煤灰大规模消纳和高值化利用的重大需求，针对其铝硅比低、矿相结构复杂、杂质含量高的问题，提出了高铝粉煤灰深度脱硅制备莫来石耐火材料的技术思路。按照项目计划开展了高铝粉煤灰矿相结构嵌布特征、复杂矿相脱硅反应机理、化学活化调控规律、产品性能调控等关键科学问题的研究，系统建立了高铝粉煤灰预脱硅反应行为-化学活化调控规律-深度脱硅反应机理-产品性能调控-酸碱介质循环的新方法，形成了高铝粉煤灰深度脱硅制备莫来石耐火材料的基础理论与优化工艺技术方案。高铝粉煤灰利用率100%，莫来石产品中氧化铝含量>70%，体积密度>2.8g/cm3，满足莫来石产品行业标准及企业要求。项目实施期间共发表论文12篇，其中SCI 9篇，EI1篇，中文核心2篇。申请国家技术发明专利10项，培养博士/硕士研究生3名，整体成果超出项目预计目标。本项目的研究可为高铝粉煤灰铝硅资源综合利用提供理论基础与技术支撑。