湿法冶金2025，Vol.44Issue(5)：653-659,7.DOI:10.13355/j.cnki.sfyj.2025.05.010
从粉煤灰活化熟料中脱钙及提取氧化铝工艺研究
Decalcification and Extraction of Alumina from Activated Fly Ash Clinker
摘要
Abstract
To address the issue of low extraction efficiency of aluminum from fly ash in pulverized coal furnaces due to its mullite structure,a process combining high-temperature enhanced decalcification with medium recycling to remove calcium and extract alumina from activated fly ash clinker was proposed.The optimal process parameters for decalcification and alumina extraction were determined through single-factor experiments.The results indicate that the optimal decalcification conditions are reaction temperature of 160℃,hydrochloric acid concentration of 12％,and reaction time of 4 h.Under the conditions,the CaO removal rate exceeds 98％,while the Al2 O3 dissolution rate is effectively suppressed below 5％.The optimal alumina extraction conditions are temperature of 60℃,hydrochloric acid concentration of 26％,and reaction time of 0.5 hours,achieving an Al2O3 dissolution rate of over 93％and controlling the Ca2+concentration in the leachate below 0.39 g/L.Innovatively,a closed-loop calcium chloride recycling system is constructed,enabling recovery rate of over 90％for the activator in filtrate reuse tests.The process can achieve efficient calcium-aluminum separation and recycling of additives,offering a low-carbon solution for alumina extraction from fly ash.关键词
粉煤灰/活化/氯化钙/脱钙/氧化铝Key words
fly ash/activation/calcium chloride/decalcification/alumina分类
矿业与冶金引用本文复制引用
王凯..从粉煤灰活化熟料中脱钙及提取氧化铝工艺研究[J].湿法冶金,2025,44(5):653-659,7.基金项目
国家科学技术部"十二五"科技计划项目(2011BAA04B05). （2011BAA04B05）
