粉煤灰提铝残渣制备体型化4A分子筛的研究

doi:10.19964/j.issn.1006-4990.2024-0296

Abstract

Abstract:

The resource transformation of fly ash aluminium extraction residue is the main link in the industrial chain of aluminium extraction from high-alumina fly ash.In this paper，the aluminium extraction residue from fly ash was used as the main raw material，and the geopolymer block was firstly prepared，and then it was converted into a bulk 4A zeolite in situ through hydrothermal reaction.The effect of different parameters on the synthesis of zeolites was studied，and the optimal process parameters for the preparation of 4A zeolites from aluminium extraction residues from fly ash were as follows：the molar ratio of silicon-aluminum was 1.8，the molar ratio of water to sodium was 50，the hydrothermal time was 9 h，and the hydrothermal temperature was 100 ℃.The results of X-ray diffraction analysis（XRD），infrared spectroscopy（FT-IR），scanning electron microscopy and energy spectroscopy（SEM-EDS），specific surface area and pore size analysis，and thermogravimetric analysis showed that the crystals synthesized under the optimal process parameters were relatively pure，the grains were relatively intact，and the thermal stability was good，with a specific surface area of 71.85 m²/g and a cation exchange capacity of 353.72 mmol（each 100 g of catalyst）.The results showed that the bulk zeolite that met the standard of 4A zeolite could be prepared with the residue of fly ash extraction of aluminum as the main raw material，and the subsequent industrialization could be considered.

Key words: aluminum extraction residue by fly ash, geopolymer, shaped 4A zeolite, hydrothermal reaction, in-situ conversion

CLC Number:

TQ133.1

LIU Xinlong, YANG Zhenyu, HAO He, LIU Shuxin, WU Chenyang, WANG Xingli, MA Qingqing. Study on shaped 4A zeolite synthesized with aluminum extraction residue by fly ash[J]. Inorganic Chemicals Industry, 2025, 57(3): 78-85.

Figures/Tables 14

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Study on shaped 4A zeolite synthesized with aluminum extraction residue by fly ash

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n（SiO₂）/n（Al₂O₃）	n（H₂O）/n（Na₂O）	水热时间/h	水热温度/℃
1.4、1.6、1.8、2.0、2.2	50	9	100
1.8	30、40、50、60、70	9	100
1.8	50	1、3、6、9、12	100
1.8	50	9	70、80、90、100、110