| Title | Optimizing sustainability and profitability: A multi-step approach to the synthesis of X-zeolite from blast furnace slag |
|---|---|
| ID_Doc | 13093 |
| Authors | Duan, WJ; Li, RM; Wang, ZM; Ji, JY; Liu, JX; Yu, QB |
| Title | Optimizing sustainability and profitability: A multi-step approach to the synthesis of X-zeolite from blast furnace slag |
| Year | 2024 |
| Published | |
| Abstract | To further unlock the circular economy potential of iron and steel industry and achieve peak carbon and carbon neutrality targets, this study provides a comprehensive analysis of the high value-added use of blast furnace slag (BFS) for the synthesis of X-type zeolite. The thermodynamic and dissolution behaviors during acid leaching are investigated through theoretical analysis, identifying the optimal pH is 0-1.63 and Eh is- 1.01-2.00 V. Experiments determine that there are obvious improvement in silica gel leaching ratio at 353 K, 4 mol & sdot;L-1- 1 HCl and V (HCl):m(slag) ratio of 12:1. Obtained silica gel has 91.56% whiteness and 86.86% SiO2. 2 . The optimal conditions for X-type zeolite synthesis are crystallization at 363 K for 6 h, with n(SiO2):n(Al2O3), 2 ):n(Al 2 O 3 ), n(Na2O):n(SiO2) 2 O):n(SiO 2 ) and n (H2O):n(Na2O) 2 O):n(Na 2 O) establishes as 2.8, 2.8 and 45 respectively and resulting material has high crystallinity, purity of crystals and excellent performance. Furthermore, the mechanism is elucidated from the perspective of micro- structural and molecular level. Economic evaluation along with carbon tax assessment indicated that it is economically beneficial both in direct profit and potential CO2 2 capture. These findings emphasize the feasibility, efficacy and economy of X-type zeolite synthesis from BFS, which contributes to turning waste into treasure and promoting the concept of "Green steel". |
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