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HWAHAK KONGHAK,
Vol.34, No.5, 570-575, 1996
Vol.34, No.5, 570-575, 1996
혼합 제올라이트에 의한 모의폐액내 Cs/Sr 동시분리
Co-Se- paration of Cs and Sr from Simulated Liquid Wastes by Mixed Zeolites
제올라이트 4A와 AW-500을 혼합한 제올라이트를 이용하여, 모의폐액내의 열 발생 핵종인 Cs과 Sr을 동시에 분리하는 연구를 수행하여 다음과 같은 결과를 얻었다. Cs과 Sr을 동시에 제거하기 위해서는 제올라이트 4A와 AW-500의 혼합비는 2:3, pH는 3.0-7.0이 좋았으며, 이 조건에서 Cs과 Sr의 이온교환용량은 각각 0.729 meq/g와 0.656 meq/g이었다. 혼합 제올라이트가 첨가되지 않은 계에서는 pH가 5 이상이면 대부분의 Cr, Fe 및 Pd은 침전물로 제거되고, Cs과 Sr은 대부분 용액내에 존재하나 혼합 제올라이트를 사용하여 거의 다 게거시킬 수 있었다. 그리고 제거율은 혼합 제올라이트의 주입량이 증가하고, 공존하는 염(salt)들이 적어지면 증가하였다.
Heat-generating nuclide Cs and Sr were co-separated from simulated liquid wastes by mixed zeolites of zeolite 4A and zeolite AW-500. Adsorption cha- racteristics of Cs and Sr by mixed zeolites were studied with a simulated liquid waste. The obtained main results were as follows:The appropriate mixing ratio of zeolite 4A to zeolite AW-500 was confirmed to be 2 : 3 for the simultaneous removal of Cs and Sr. A favorable pH region was found to be from 3.0 to 7.0. The amounts of Cs and Sr adsorbed were estimated to be 0.729meq/g and 0.656meq/g, respectively. Most of Cs and Sr remained in the solution and Cr, Fe and Pd were removed as precipitates when the pH rose over 5.0 without mixed zeolites. Then both Cs and Sr were completely removed by mixed zeolites. The removal percentage was improved with in- creasing mixed zeolite quantity and decreasing the presence of coexisting salts.
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