희토류 추출공정 잔사 및 수처리 슬러지의 안정화/고형화 평가
Assessment of Stabilization/Solidification for Residue and Water Treatment Sludge from Extraction Process of Rare Earth Elements
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초록
중국 희토류 추출잔사 및 수처리 슬러지를 대상으로 안정화/고형화제의 적용성을 TCLP(Toxicity Characteristic Leaching Procedure)로 평가하였다. 희토류 슬러지에 광산배수 슬러지 10% 혼합시 As 76%, Se 67%가저감되었으며 Ba은 FeSO4 2% 혼합시 99%까지 저감되었다. Biochar는 10% 처리시 Be, Ba, Pb을 각각 82%, 86%, 92% 저감하였으며, 이는 발달된 미세구조의 영향으로 판단된다. 잔사의 시멘트 10% 처리 결과 Be, Pb, Th이 0.08 mg/L 이하로 저감되었다. As 및 Se은 시멘트 20% 이상 처리시 각각 98.0~99.9%, 54.7~98.6%만큼 저감되어 Ca-As 및 Ca-Se 화합물을 생성한 것으로 추정된다. 그러나 Se은 약 10.5 이상의 pH 조건에서 이동성이 증가하는 것으로 확인되었다.
Abstract
For residue and water treatment sludge from extraction process of rare earth elements in China, addition of stabilizing/solidifying agents was evaluated by Toxicity Characteristic Leaching Procedure (TCLP). Coal mine drainage sludge mixed at 10% ratio removed 76% and 67% of As and Se, respectively, from the sludge. Ferrous sulfate mixed at 2% ratio removed 99% of Ba. Bone char mixed at 10% ratio removed 82%, 86% and 92% of Be, Ba and Pb, respectively, possibly because of its micro-structure. Be, Pb, and Th were reduced to <0.08 mg/L at a cement amendment ratio of 10%. As and Se decreased by 98.0~99.9% and 54.7~98.6%, respectively, after amendment of cement at mixing ratios of ≥ 20%, suggesting formation of Ca-As and Ca-Se complex. However, Se increased at pH>10.5, indicating increase of mobility.
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