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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.41, No.2, 264-270, 2003
여러 가지 광물 흡착제에 의한 기체상 카드뮴의 고온흡착특성
High Temperature Adsorption Characteristics of Gaseous Cadmium by Various Mineral Sorbents
윤종성, 강용, 양희철, 강문자, 김준형
기체상 염화카드뮴에 대한 7가지 무기흡착제의 제거특성을 고온 고정층 반응기를 이용하여 고찰하였다. 사용된 흡착제는 알루미나(alumina), 보오크사이트(bauxite), 안달루사이트(andalusite), 샤못트(chamotte), 고령토(kaolin), 납석(pyrophyllite) 그리고 규석(silica)이다. 카드뮴 제거에는 고령토, 샤못트 및 규석이 상대적으로 뛰어난 특성을 지닌 것을 알 수 있었다. 이들에 의해 흡착된 카드뮴은 TCLP 용출실험에 의해서 쉽게 용출되지 않는 우수한 침출특성을 지니고 있었다. 반응생성물에 대한 분석으로부터 고온무기흡착제를 이용한 카드뮴 제거에 대한 다음의 세가지 메커니즘이 제시되었다: 1) 불용성 물질(CdOㆍSiO2, CdOㆍAl2O3ㆍ2SiO2)을 생성하는 화학적 흡착반응, 2) 수용성 물질인 CdCl2로의 물리흡착, 3) 흡착제 표면에 불용성 물질인 CdO의 형성.
The characteristics of seven inorganic sorbents for the capture of gaseous cadmium chlorides were investigated using a high-temperature fixed bed sorption reactor. The investigated sorbents were alumina, bauxite, andalusite, chamotte, kaolin, pyrophyllite and silica stone. Kaolin, chamotte and silica stone appeared to be the relatively promising sorbents for cadmium capture. Sorbed cadmium by those minerals was not easily leached by TCLP extraction. From the analyses of post-sorption sorbent samples, three kinds of capturing mechanisms for cadmium capture by high temperature inorganic sorbents were suggested: 1) chemical reaction to form water-insoluble cadmium-mineral complexes such as CdO · SiO2 and CdO ·Al2O3 · 2SiO2, 2) physical adsorption of gaseous chloride to form water-soluble cadmium chloride(CdCl2), and 3) formation of water-insoluble cadmium oxide(CdO) on sorbent surface.
Keywords: Inorganic Sorbents; Cadmium Chloride; High Temperature Fixed Bed; Leachability; Reaction Mechanism
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