粉煤灰提铝渣中二氧化硅在高浓度碱液中的溶解行为  

Dissolving behavior of SiO2 in residue of fly ash detached Al2O3 in highly concentrated alkali solution

作　　者：吴艳[1] 翟玉春[1] 牟文宁[1] 孙扬[1] 

机构地区：[1]东北大学材料冶金学院,沈阳110004

出　　处：《中国有色金属学报》2008年第E01期407-411,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划资助项目（2007CB613603）

摘　　要：粉煤灰酸法提取氧化铝后渣中二氧化硅含量接近85％，是制备硅酸钠水玻璃的优质原料。提出了在常压下用高浓度碱液浸出粉煤灰提铝渣中二氧化硅的工艺；研究了二氧化硅在浓碱体系中的浸出行为。实验结果表明，在温度为110℃、碱浓度为50％、液固比为2．2：1、时间为60min条件下反应最佳，碱浸渣的XRD分析表明，对酸渣进行二次碱浸后，渣中SiO2浸出完全，主要物相为钠硅渣和碳酸盐。The concentration of SiO2 in the residue of fly ash detached Al2O3 was 85%. It is the excellent material to prepare Na2SiO3. A new method of leaching SiO2 from the residue was studied in atmosphere and highly concentrated alkali solution. The optimum conditions are： reaction temperature 110 ℃, alkali concentration 50%, ratio of liquid to ore 2.2：1 and reaction time 60 min. The XRD was used to analyze the residue after alkali leaching. The result shows that SiO2 is leached completely and the main phases are Na-Al silicate slime and carbonate.

关 键 词：粉煤灰 渣 浸出 浓碱 硅酸钠 二氧化硅 

分 类 号：TQ110.3[化学工程—无机化工]