粉煤灰提铝渣中二氧化硅在高浓度碱液中的溶解行为

来源期刊:中国有色金属学报2008年增刊第1期

论文作者:吴艳 翟玉春 牟文宁 孙扬

文章页码:407 - 411

关键词:粉煤灰;渣;浸出;浓碱;硅酸钠;二氧化硅

Key words:fly ash; residue; leaching; highly concentrated alkali solution; Na2SiO3; SiO2

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60 min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。

Abstract: 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.

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