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간빌렉 가야바자르,공경록,강진구,강헌찬 동아대학교 환경문제연구소 2006 硏究報告 Vol.28 No.1
An experimental study was conducted to investigate the purification of waste gypsum. Waste gypsum, a by-product of the phosphoric acid industry, is contaminated with impurities of P₂O_(5), F, organic matter etc. In the case of waste gypsum concentrate, SO₃ content is higher than CaO content and it can be understood that it contains excess SO₃ constituent. In the case of waste gypsum residue, SiO₂ content is very high and also contents Al₂O₃, Fe₂O₃, and P₂O_(5) are generally below 1.5~2 wt.% and it is confirmed that CaO content is relatively less than that of SO₃content. As a result of crystal shape analysis of waste gypsum concentrate, quadrangle shaped gypsum crystals are tangled and formed circular shaped lumps. After grinding these lumps, each crystal takes its own shape of column or quadrangle and waste gypsum residue crystal can be observed as colored and column shaped. SEM analysis and XRD analysis results show that colored crystals of waste gypsum residue does not exist separately from gypsum crystals but gypsum crystals are the core parts of waste gypsum residue; in other words, lumps of gypsum crystals are tangled and it is considered that gypsum crystals exist as inclusion in the lumps. It can be understood from results DSC analysis of waste gypsum concentrate and reagent gypsum that waste gypsum has about 21.5% lower in its endothermic capacity, compared to reagent gypsum. 폐석고 는 국내의 여러 산업분야에서 약 400만톤 정도가 해마다 발생되고 있으며 현재 활용되지 못하고 방치되고 있는 양만도 2,000만톤 정도에 이르 고 있으며 Cd등 유해한 중금속이 환경 기준치 이상 함유되어있고"C 방사능 물질인 Rd가 함유 되어 있어서 라돈 가스의 유출로 매우 유해 하며 pH가 3 정도인 매우 강산성 물질이다. 국내에서는 석고의 부존자원이 전혀 없어 천연석고를 수입에 의존하고 있어 부생석고의 활용방안을 모색하는 것은 외화 의 절감뿐만 아니라 폐석고로 인한 심각한 환경오염문제를 해결하는데도 큰 도움이 될 수 있다. 이러한 폐석고가 처리 및 자원화 되지 못하고 있는 근본 적인 이유는 인산석고의 품위가 낮고, 중금속들 과 방사선물질이 함유되어 있기 때문에 효율적으로 자원화하기 위해선 무엇 보다도 정제처리에 경제성 있게 불순물 선별 기술 이 선결되어야 하며 따라서 본 연구자들은 이러한 인산 염 폐 석고 를 정제하여 물성 변화를 관찰하였다.
간빌렉 가야바자르,공경록,강헌찬 동아대학교 환경문제연구소 2006 硏究報告 Vol.28 No.1
This study examined physical properties of purified phosphogypsum were compared trough thermal analysis, while crystallization change by temperature and time was analyzed by applying gypsum characteristic of crystallization change with temperature to phosphogypsum. From through observation of crystal change of waste gypsum by temperature, it is considered that hydrated gypsum changes to hemihydrated gypsum, in the case of three hours of heating at 170°C. Gypsum hemihydrate was formed by dehydrating waste gypsum in a water solution at(300℃) for (10min~120min) to form needle- like crystals. The large gypsum dehydrate was formed by higher the temperature of the gypsum hemihydrate suspension below. In the case of 300~1100°C heating, waste phosphogypsum forms Il-anhydrate gypsum, as the heating continues. The anhydration products were examined by SEM image and XRD analyses.
Separation of Recycled Aggregates from Waste Concrete by Heavy Medium Separation
이명규,권기오,간빌렉,강헌찬,Lee, Myung-Gyu,Kwon, Ki-O,Gayabazar, Ganbileg,Kang, Heon-Chan The Korean Institute of Resources Recycling 2007 資源 리싸이클링 Vol.16 No.5
폐콘크리트를 재활용하기 위하여 파쇄과정과 입도조절과정을 거쳐서 생산된 재생골재에는 모르타르나 시멘트페이스트가 많이 부착되어 있어 밀도가 낮고 흡수율이 높아 구조용 골재로 사용할 수 없는 실정이다. 그러나 생산된 재생골재 내에는 많은 양의 콘크리트용 재생골재가 포함되어 있으며 이들을 비중선별방법 중 중액선별을 통해 선별하여 콘크리트용 1종 재생골재를 약 45%정도를 생산할 수 있었다. The recycled aggregates produced from waste concrete by crushing and granularity adjusting processes only can't be used for structural aggregates because they display low density and high abrasion rate by including lots of mortar and cement paste. However, the recycled aggregates include a lot of aggregates for concrete. Using the heavy medium separation method that is one of the specific gravity separation methods, about 45% of the waste concrete could be converted to the recycled aggregates.