| 균일침전법에 의한 수화 염기성 알루미늄염의 합성 및 열분해 |
| 박홍채, 김주석1, 이승호2, 오기동 |
부산대학교 무기재료공학과
1한국유리공업(주) 기술연구소
2부산지방공업시험소 |
| Preparation of Hydrated Basic Aluminum Salts by Homogeneous Precipitation Method and Their Thermal Decomposition |
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| ABSTRACT |
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High purity(99.99%) spherical particles of hydrated Basic Aluminum Salts(BAS) were prepared by a homogeneous precipitation process utilizing the urea decomposition reaction and characterized by XRD, SEM, TG-DTA, IR and PSA methods. Amorphous hydrated BAS was precipitated in the range of pH 4~6. The molar ratio [Al3+]/[SO42-] for the precipitate particles was about 3.7. With increasing the concentration of aluminum sulfate the precipitation of the hydrated BAS occurred slowly and the precipitate particles with a narrow size distribution were fine(1-2${mu}{textrm}{m}$ in diameter). At temperatures in the range 400$^{circ}$to 95$0^{circ}C$, desulfurization and dehydroxylization resulted in weight loss with 22%. When the precipitate particles were thermally treated, the crystlline ${gamma}$-Al2O3 was identifited by XRD at 50$0^{circ}C$ and ${gamma}$-Al2O3 particles were transformed into $alpha$-Al2O3 at 100$0^{circ}C$. A vermicular network was produced by calcining at 125$0^{circ}C$ for 30min. |
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