Direct Synthesis of A-Type Molecular Sieve from Rare Earth Tailings by Hydrothermal Method AITranslate
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Taking the Bayan Obo rare earth tailings as raw materials,alkali melt-activated rare earth tailings as silicon source and sodium metaaluminate as aluminum source,A-type molecular sieve was direct synthetized by hydrothermal method to realize the secondary utilization of rare earth tailings.The effects of the amount of alkali addition on the silicon activation of rare earth tailings and the amount of sodium metaaluminate addition on the synthesis of the molecular sieve were studied,and the phase composition,micro-morphology,and pore structure of the synthesized molecular sieve were analyzed by XRF,XRD,SEM-EDS,and BET.The results show that when the alkali-ore mass ratio is 3,the tailings are fully activated and the crystalline silicon species are transformed into soluble active Si element,of which the dissolution rate is 84%.Under the template-free condition,the A-type molecular sieve can be synthesized from alkali melt-activated rare earth tailings with different SiO2/Al_2O3 molar ratios,presenting a regular spherical structure with large specific surface area and pore volume,with the pore structure in microporous form.When SiO2/Al2O3 molar ratios is 1.5,the synthesized A-type molecular sieve has the maximum specific surface area of 215.5 m2/g.Fe,Mg and Si in the tailings react with Al to form ferric aluminum anthophyllite impurities,which reduce the crystallinity of the A-type molecular sieve.
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Basic Information:
DOI：
Chinese Library Classification Number:TD983[矿业工程—选矿]
Citation Information:
Taking the Bayan Obo rare earth tailings as raw materials,alkali melt-activated rare earth tailings as silicon source and sodium metaaluminate as aluminum source,A-type molecular sieve was direct synthetized by hydrothermal method to realize the secondary utilization of rare earth tailings.The effects of the amount of alkali addition on the silicon activation of rare earth tailings and the amount of sodium metaaluminate addition on the synthesis of the molecular sieve were studied,and the phase composition,micro-morphology,and pore structure of the synthesized molecular sieve were analyzed by XRF,XRD,SEM-EDS,and BET.The results show that when the alkali-ore mass ratio is 3,the tailings are fully activated and the crystalline silicon species are transformed into soluble active Si element,of which the dissolution rate is 84%.Under the template-free condition,the A-type molecular sieve can be synthesized from alkali melt-activated rare earth tailings with different SiO2/Al_2O3 molar ratios,presenting a regular spherical structure with large specific surface area and pore volume,with the pore structure in microporous form.When SiO2/Al2O3 molar ratios is 1.5,the synthesized A-type molecular sieve has the maximum specific surface area of 215.5 m2/g.Fe,Mg and Si in the tailings react with Al to form ferric aluminum anthophyllite impurities,which reduce the crystallinity of the A-type molecular sieve.
quote
| GB/T 7714-2015 | [1] HOU Li-min, XU Jie, HE Yang, et al. Direct Synthesis of A-Type Molecular Sieve from Rare Earth Tailings by Hydrothermal Method[J]. Rare Metals and Cemented Carbides, 2023(4): 57-64. |
| MLA | [1] HOU Li-min, et al., "Direct Synthesis of A-Type Molecular Sieve from Rare Earth Tailings by Hydrothermal Method." Rare Metals and Cemented Carbides, no. 4, 2023, pp. 57-64. |
| APA | [1] HOU Li-min, XU Jie, HE Yang, LI Hao-bo, & WU Wen-fei. (2023). Direct Synthesis of A-Type Molecular Sieve from Rare Earth Tailings by Hydrothermal Method. Rare Metals and Cemented Carbides(4), 57-64. |
| IEEE | [1] HOU Li-min, XU Jie, HE Yang, LI Hao-bo, and WU Wen-fei, "Direct Synthesis of A-Type Molecular Sieve from Rare Earth Tailings by Hydrothermal Method," Rare Metals and Cemented Carbides, no. 4, pp. 57-64, 2023. keywords: {rare earth tailings;alkali melting activation;hydrothermal method;molecular sieve;resource} |