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HWAHAK KONGHAK,
Vol.34, No.3, 305-311, 1996
Vol.34, No.3, 305-311, 1996
염산법에 의한 고령토 광물 중의 Al 성분 추출에 관한 연구
Extraction of Al Component from Kaolin by the Hydrochloric Acid Leaching
고령토에 함유되어 있는 Al성분을 염산용액으로 추출해 내고, 추출모액(AlCl3 용액)을 이온교환법에 의해 정제한 후,공통이온 효과에 의한 용해도 차 원리를 이용하여 AlCl3 6H2O 결정을 석출한 다음 소성해서 알루미나 분체를 제조하였다. 그 결과, Al 성분의 최적 추출조건은 염산용액 농도 8N, 추출온도 110℃, 추출시간 3hrs 및 반응몰비 1.0임이 검출되었고, 이 조건하에서 Al성분의 추출률은 약 90wt%에 달하였다. 또한 AlCl3 6H2O결정을물성적으로 안정한 α-Al2O3형태로 상전이하는데 필요한 소성온도는 1200℃ 이상임을 검출하였으며, 특히 정제모액으로부터 제조한 알루미나의 경우 약 99.8wt%의 순도값을 보였다.
To obtain alumina by the hydrochloric acid leaching, calcined kaolin was leached with hydrochloric acid, and the leach liquor was treated by ion exchange resin to remove iron. Aluminum chloride hexahydrate was crystallized from the purified leach liquor by the injection of hydrochloric gas. The crystals of aluminum chloride hexahydrate were calcined to alumina. As the results, it was found that the optimum conditions of extraction of Al component from calcined kaolin were as follows; concentration of hydrochloric acid was 8N, temperature was 110℃, extraction time was 3hrs and stoichiometric molar ratio of reaction between kaolin and hydrochloric acid was 1.0. The extraction yield of Al component was about 90% by weight under this conditions. Furthermore, transition temperature from the aluminum hexahydrate to wellcrystallized α-Al2O3 was observed above 1200℃. Especially, the quality of produced alumina from the purified leach liquor was about 99.8 by weight.
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