http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이우근 ( Woo-keun Lee ),심정민 ( Jung-min Shim ) 한국폐기물자원순환학회 2021 한국폐기물자원순환학회지 Vol.38 No.1
Heavy metal leaching from waste, such as waste limestone (WL), poses a significant secondary environmental problem. It is necessary to develop methods to detoxify these hazardous pollutants and effectively recycle them as resources. In this work, factors for enhancing insulating properties with the use of waste as resources have been studied. Waste, such as WL, melting slag (MS), and aluminum dross were used as raw materials to prepare insulating brick using the geopolymer technique. Sufficient amounts of Si and Al in raw materials were also required to prepare the insulating brick. Therefore, MS was used to supplement the proportion of Si and Al in order to form the geopolymer. The effects of the addition of aluminum dross and the molar ratio of alkali activator on the insulating properties were discussed. Additionally, the compressive strength and the apparent porosity of the prepared bricks were analyzed. The optimal properties of the brick material were obtained at a mixing ratio of WL to MS of 9.5 : 0.5 and 3 wt. % Al dross. Under these conditions, thermal conductivity, compressive strength, and volume-specific gravity were 0.27W/m·K, 2.58MPa, and 0.76, respectively. According to the regression analysis of the thermal conductivity and apparent porosity, a strong negative correlation between the two factors was obtained.
손세구,이우근,김영도,김경남,Son, Se-Gu,Lee, Woo-Keun,Kim, Young-Do,Kim, Kyung-Nam 한국재료학회 2011 한국재료학회지 Vol.21 No.9
The goal of the present work was to investigate the development of a geopolymeric ceramic material from a mixture of mine residue, coal fly ash, blast furnace slag, and alkali activator solution by the geopolymer technique. The results showed that the higher compressive strength of geopolymeric ceramic material increased with an increase in active filler (blast furnace slag + coal fly ash) contents and with a reduction of mine residue contents. The geopolymeric ceramic had very high early age strength. The compressive strength of the geopolymeric ceramic depended on the added active filler content. The maximum compressive strength of the geopolymeric ceramic containing 20 wt.% mine residue was 141.2 MPa. The compressive strength of geopolymeric ceramic manufactured by adding mine residue was higher than that of portland cement mortar, which is 60 MPa, when cured for 28 days. SEM observation showed the possibility of having amorphous aluminosilicate gel within geopolymeric ceramic. XRD patterns indicate that the geopolymeric ceramic was composed of amorphous aluminosilicate, calcite, quartz, and muscovite. The Korea Standard Leaching Test (KSLT) was used to determine the leaching potential of the geopolymeric ceramic. The amounts of heavy metals were noticeably reduced after the solidification of mine residue with active filler.
소각 비산재의 적정처리를 위한 기초연구(II) - 용출인자의 영향 -
김진범,이우근,심영주,Kim, Jin-Beom,Lee, Woo-Keun,Shim, Yeong-Ju 대한환경공학회 2000 대한환경공학회지 Vol.22 No.7
Our study was performed to evaluate the effect of leaching parameters including the physicochemical characteristics and the fractionated composition of heavy metals on the release of heavy metals in fly ash discharged from MSWI. Leaching parameters such as pH, CEC, particle size, and exchangeable fraction among the fractional composition classified by sequential extraction procedure are considered. The leaching rate of heavy metal released by KSLT method is largely dependent on the pH of fly ash. The effect of pH on the release of heavy metals is different from elements. It appears that the leaching rate of cadmium and copper decreases with increasing pH, while lead and zinc increases at the condition of neutral or strong alkali condition, which suggests that the leaching of heavy metals are limited by the solubility. It is found that the effect of CEC is similarly to that of pH, $D_{10}$ among the particle size of fly ash is negative correlated with the concentration of heavy metals leached by KSLT method. In the case of exchangeable fraction, the leaching rate of heavy metals is linearly correlated with the exchangeable fraction for the fly ash below 40 meq/l00g of CEC, but not related out of the range. 본 연구는 소각 비산재의 물리 화학적 특성이 중금속의 용출 거동에 미치는 영향을 알아보고자 수행되었다. 영향인자로는 비산재의 pH, CEC, 입자크기, 연속추출방법에 의해 분류된 중금속의 존재형태 중에서 exchangeable fraction을 고려하였다. KSLT법에 의한 중금속의 용출율은 pH에 크게 의존적이고 원소에 따라 차이를 보였다. 카드뮴과 구리의 용출율은 pH가 증가함에 따라 감소한 반면, 납과 아연은 중성 또는 강알칼리성 조건에서 증가하는 것으로 나타났는데, 중금속의 용출 거동이 용해도에 의해 제한됨을 나타내 준다. CEC가 중금속의 용출율에 미치는 영향은 pH와 비슷한 것으로 나타났다. 비산재의 입자크기 중에서 $D_{10}$은 KSLT법에 의한 중금속의 용출량과 음의 상관성을 나타내었다. Exchangeable fraction의 경우는 비산재의 CEC 값이 40 meq/100g 미만인 시료는 선형관계에 있지만, 그 외의 CEC 값에서는 비선형관계를 보여주었다.