• 한국지하수토양환경학회지:지하수토양환경
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• 제18권1호
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• pp.85-93
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• 2013

This study is conducted to evaluate the leaching of contaminants from mine tailing by natural water and finally to estimate the leaching and transportation of heavy metal contaminants by rainfall. In order to identify contaminated heavy metal of soil, 17 soil, 2 tailing and 2 waste dump and 2 control samples were taken at mine area and analyzed total metal contents. The leaching experiments were conducted using distilled water. Cu, Pb, Zn was extracted from the reddish mine tailing in a short period time, especially the extraction rate of Cu (45.0%) was highest. The contaminants were leached from the yellowish mine tailing within an hour and the leaching rate of Cd (42.0%) and Zn (17.2%) were relatively high. The reddish soil from the waste dump showed leaching of Cu (5.1%), Pb (4.0%) and Zn (3.3%), however the leaching rate was low except Mi (14.2%). From the yellowish soil sampled from the dumping site, the leaching of Cu (8.2%) and Ni (9.7%) was high while the leaching of Zn (0.2%) were relatively low.

• 한국응용과학기술학회지
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• 제26권1호
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• pp.80-86
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• 2009

This research was performed to evaluate heavy metal leaching characteristics of the sludge from paper mill process with sintering temperature. Heavy metal leaching of the sludge was characterized with Korean Leaching Test and Toxicity Characteristic Leaching Procedure. The test sludge was composed of 70.72% of moisture, 9.5% of volatile solids and 9.76% of fixed solids. As a result of XRF analysis, Fe was the highest inorganic element in approximately 83%, which implies the recycling possibility of the sludge in reuse of Fenton chemicals and artificial lightweight aggregate. Leaching of heavy metals from sintered sludge was lower than the dry ones. However, there was no significant difference in leaching characteristics between the sludges sintered at $350^{\circ}C$ and $650^{\circ}C$. Zn and Fe were leached more greatly in TCLP and KLT methods respectively.

• 한국세라믹학회지
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• 제33권8호
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• pp.889-894
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• 1996

This study was subjected to the stabilization of heavy metals using DSp cement. Heavy metal Cr and Pb ions were mixed with cement paste and hydration behavior and leaching property by heavy metal were exami-ned. It was found that, Cr ion accelerated the early hydration of the cement and has no accelerating effect in later hydration period. However Pb ion retarded the hydration of the cement for a early hydration periods. As a result of leaching test the quantity of leachant has a very low value and the influence of leached heavy metal effected on the environments is very weak.

• 한국결정성장학회지
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• 제16권2호
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• pp.76-81
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• 2006

중금속 이온의 용출거동은 콜로이드/계면 성질에 의존하는데, 이를 알아보기 위해 ICP와 SEM 분석을 하였다. 전기로 제강분진에 포함된 중금속은 '양쪽성 금속'으로 pH 10에서 중금속이 가장 적게 용출되는 것을 알 수 있었고 pH 8보다 pH 12에서 중금속 이온이 상당량 용출되어 나왔다. 그리고 전기로 제강분진에 점토를 첨가함으로써 중금속 이온의 용출이 감소하는 것을 알 수 있었다. 특히 pH 12의 경우에 pH 8에 비해서 중금속 이온의 용출이 큰 폭으로 감소하였으며 콜로이드계면 성질 관찰 결과, 점토의 경우 pH 12에서 점토에서 녹아나온 Si 수화물이 점토 입자표면을 둘러싸고 있음을 관찰할 수 있었다. 전기로 제강분진과 점토의 혼합 슬러리에서 pH 8의 경우보다 pH 12에서 중금속 이온의 농도가 크게 감소한 것은 PSHP의 형성에 의한 것으로 사료된다.

• 환경위생공학
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• 제14권3호
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• pp.71-79
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• 1999

The Hg, Cd, Cu, Mn, and Zn in bottom sediments of han river and their tributaries were analyzed to evaluate the seasonal variations of heavy metals. Leaching tests were also performed for estimation of availability of heavy metal retention in sediments. Sediments of Anyang stream showed the highest concentration of heavy metal in the sediment samples. Heavy metal concentration was heavily depended upon the heavy metal source of tributaries of han river and particle distribution. Clay and silt had higher concentration of heavy metals than very fine san and fine sand due to difference of retention capability of heavy metal. The highest concentration of heavy metal was observed in bottom sediments irrespective of sites investigated. Heavy metals and ignition loss showed positive relations, and higher relationships with p-value <0.01 were observed between copper and lead. copper and zinc, and depended on the pH condition of leaching test, and leachated fraction increased with decrease of the pH.

• Environmental Engineering Research
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• 제24권1호
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• pp.82-90
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• 2019

Meeting the regulations based on the short-term leaching tests may not necessarily assure the environmental and human health safety of reusing mine wastes. This study investigated heavy metal leachability of four metal mine waste samples (e.g., Z, Y, H, and M) and human health risk of reusing them as construction materials. The heavy metal leachability did not depend on the total heavy metal contents. For example, the Z sample contained greater amounts of As and Fe than Zn, but the leachates contained only Zn at a detectable level. This can be attributed to the crystalline structure and heavy metal fractions of the mine wastes. The leaching test results suggested that the four mine waste samples are potentially reusable. But the Z and M samples reused in industrial areas imposed carcinogenic risks. This was largely attributed to As that is exposed via dermal contact. The Y and H samples reused in residential areas imposed carcinogenic risk. The major exposure route was the ingestion of crops grown on the mine wastes and Cr was the major concern. The two-stage assessment involving leaching tests and risk assessment can be used to promote safe reuse of mine wastes.

• 한국결정성장학회지
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• 제16권2호
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• pp.88-93
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• 2006

유해한 중금속을 다량 함유하는 EAF(electric arc furnace) 더스트를 세라믹 원료로 재활용하기 위해서 EAF 더스트, EAF 더스트-점토에 대해서 pH와 혼합비에 따른 중금속 용출농도의 변화를 분석하였다. 소성과정 중에서 발생하는 중금속의 휘발량을 소지 내의 중금속 이온의 총량을 측정하여 평가하였으며 TCLP(toxicity characteristic leaching procedure)분석을 통해 중금속 이온의 안정화 정도를 평가하였다. EAF 더스트-점토 슬러리의 pH를 10으로 조절하였을 경우에 습식혼합 여액중의 중금속 이온의 농도가 가장 낮은 값을 가졌다. pH 10의 슬러리에 대해서 혼합비와 소성온도에 따른 소지내 중금속 이온의 총량을 측정한 결과 소성온도와 EAF 더스트의 함량이 증가할수록 중금속의 휘발이 증가하였으며, 점토의 혼합비가 증가할수록 중금속 이온의 휘발이 억제되었다. TCLP 분석결과 점토의 혼합비와 소성온도가 증가할수록 중금속의 용출은 감소하였으며 중금속의 용출농도는 기준치 이하로 안정화되었음을 확인할 수 있었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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• pp.564-567
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• 2004

FAs and BAs indicated different chemical compositions and physical properties. Leaching of Pb in FAl and Cu in FA2 were 33.2mg/L and 5.92mg/L, these were high concentration above 30 and 2 times respectively in compared to permit level. Leaching of Hg and Cr were about 1/2 of permit level. When diatom was complexly mixed with portland cement, the 28 days compressive strength of mortar with FA2 was similar with that of control mortar. Furtherfore, leaching of heavy metal ions like as Pb, Cu, Hg, Cr was highly reduced.

• 한국지하수토양환경학회지:지하수토양환경
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• 제6권1호
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• pp.23-31
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• 2001

용융처리는 중금속을 안정화시키는 효과적인 방법의 하나이며, 또한 고가의 부산물을 생산해낸다. 본 연구에서는 소각재를 용융하여 얻은 슬래그의 중금속 용출특성을 평가하고자 한다. 슬래그를 재활용하는데 있어서 환경적인 적합성을 평가하기 위하여 소각재, 슬래그 및 슬래그를 재활용재로 하여 제조한 건설재료에 대한 용출시험을 수행하였다. 시험결과는 다음과 같다. (1) 국내표준용출시험법(KSLT)에 의해 시험한 슬래그의 중금속 용출농도는 소각재의 용출농도보다 낮은 값을 나타냈다. (2) 장기용출시험법에 의해 평가한 슬래그의 중금속 용출농도도 KSLT의 기준을 만족했다. (3) 슬래그의 건설재료로서의 사용성을 평가하기 위해 만든 모르타르 공시체의 용출결과, 슬래그를 재활용재로서 사용하는데 있어서 중금속 용출 측면에서 적합하다고 사료된다. (4) 독일의 소각재 재활용을 위한 가이드라인인 RG Min-StB 93, FGSV에서 제시하는 방법에 의해 시험한 결과, 본 슬래그의 용출농도는 독일의 규제기준을 만족하였다.

• 환경위생공학
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• 제13권2호
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• pp.121-127
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• 1998

This study was to understand leaching characteristics with pH controlling agents and Temp. control, and investigate leaching characteristics with pH control from opening a leaching test to an end for reassessing leaching test of heavy metals with environmental conditions in landfill. Because leaching of heavy metals was increased in low pH, pH must control for leaching in existing leaching test. Generally, regulation time(6hr) of leaching was confirmed reasonablely, except for Cu in plating sludge. In pH controlling solution, there was nearly not difference between Acetic acid and HCl and if considering Cu, the former was appropriate. In a part of heavy metal, leaching rate was increased in high Temp., and normal Temp. in existing leaching test would be revaluated.