Conversion of Harmful Fly Ash Residue to Zeolites: Innovative Processes Focusing on Maximum Activation, Extraction, and Utilization of Aluminosilicate.
Conversion of Harmful Fly Ash Residue to Zeolites: Innovative Processes Focusing on Maximum Activation, Extraction, and Utilization of Aluminosilicate.
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有害的粉煤灰残留物转换为沸石：专注于最大激活，提取和利用铝硅酸盐的创新过程。
DOI：
10.1021/acsomega.2c02388
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发表时间：
2022-06-14
期刊：
影响因子：
4.1
通讯作者：
Liu, Huidong
中科院分区：
文献类型：
--
作者：
Liu, Huidong
通过酸浸法回收粉煤灰氧化铝提取（FAAE）的固体残渣的再利用存在问题。本研究考察了该固体残渣转化为富铝沸石（13 X）和富硅沸石（ZSM-5）的情况。FAAE残渣经Na 2CO 3粉（质量分数为110%）在890 °C碱焙烧60 min活化后，硅和铝主要以Na 2SiO 3和NaAlSiO 4两种矿物相存在。在100 °C下20分钟后，将焙烧的产物溶解在水中（液/固比为2）。研究了水浸出液在没有外部铝或硅添加的情况下向铝硅酸盐沸石的总转化。富铝沸石13 X的水热合成是成功的条件微调后，虽然滤液具有异常高的SiO2/Al 2 O3摩尔比。13 X的生产消耗了大量的铝，这将Si/Al比提高到适合于合成ZSM-5的水平。实验证明，以13 X母液为原料合成ZSM-5分子筛是可行的。FAAE残渣转化为高附加值沸石产品的转化率接近100%。此外，该工艺的尾液，主要含有Na 2CO 3，完全回收。该工艺可实现类似硅铝酸盐固体废弃物的高效、高值化利用。
Reuse of the solid residue from coal fly ash alumina extraction (FAAE) by acid leaching is problematic. Conversion of this solid residue into aluminum-rich zeolite (13X) and silicon-rich zeolite (ZSM-5) was investigated in this research. The FAAE residue was activated by alkali roasting with Na2CO3 powder (110% mass fraction) at 890 °C for 60 min. Silicon and aluminum were mainly present as two mineral phases, Na2SiO3 and NaAlSiO4, respectively, in the product obtained after roasting. The roasted product was dissolved in water (liquid/solid ratio of 2) after 20 min at 100 °C. The water-leaching liquor was investigated for total conversion to aluminosilicate zeolites without external aluminum or silicon addition. Hydrothermal synthesis of aluminum-rich zeolite 13X was successful after fine tuning of the conditions, although the filtrate had an unusually high SiO2/Al2O3 molar ratio. Production of 13X consumed a large amount of aluminum, which increased the Si/Al ratio to a level suitable for synthesis of ZSM-5. The synthesis of ZSM-5 from the mother liquor of 13X was proved feasible. The FAAE residue was transformed into high-value zeolite products by nearly 100%. Additionally, the tail liquid of this process, mainly containing Na2CO3, was completely recycled. This process could be used to realize high-efficiency and high-value utilization of similar aluminosilicate solid wastes.
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