EAF dust가 함유된 붕규산염계 결정화 유리의 미세구조 분석
Microstructure of borosilicate glass-ceramics containing EAF dust
1
조회
0
다운로드
0
인용
0
참고문헌
초록
붕규산염계 유리 프리트에 중금속이 다량 함유된 전기로 EAF dust(전기로 제강분진, 이하 더스트)를 10~80 wt% 범위로 첨가한 후 용융하여 유리 시편을 얻었다. 제조된 유리의 DTA 분석 결과로부터 유리전이온도, Tg가 550oC 부근임을 확인하였고 이로부터 결정화에 필요한 열처리 조건을 700oC/10 hr으로 정하였다. 더스트 첨가량이 70 wt% 이상인 유리시편 은 XRD 분석 결과 spinel 결정 피크만이 나타났으며, 결정화 시편의 경우, 더스트 첨가량이 40 wt% 이상부터 spinel 결정이, 80 wt%부터는 spinel과 willemite 피크가 함께 검출되었다. XRD 분석으로는 결정상이 검출되지 않았던 조성의 유리시편에 서도 aspect ratio = 0.7~1.0인 수십 nm 크기의 결정상 존재가 SEM으로 확인되었고 결정화 시편에서도 더스트 함량이 10 wt%부터 결정상이 관찰되었다. 결정화 시편에서 관찰된 결정상은 그 형태와 분포가 첨가량에 따라 다양하고 비균일 하 였으나 더스트 첨가량이 70 wt%인 시편에서는 aspect ratio가 1에 가까운 6면체 형상을 나타내었다
Abstract
Glasy specimen was obtained by melting and quenching a borosilicate glas frit mixed with 10~80 wt% EAFdust. The glass transition temperature, Tg of glasy specimen was measured around 550oC from the DTA curve and theheat treatment condition to crystalize a glassy specimen was selected as 70oC/1 hr. The spinel crystal peaks were found incontaining dust > 40 wt%, and the spinel and willemite peaks in dust > 80 wt%. The crystals of several tens of nanometerwith aspect ratio of 0.7~1.0 were observed at a glassy specimen containing dust > 40 wt% by SEM which was not foundby XRD analysis. For the glass-ceramics, the crystals were found in a specimen containing dust of even 10 wt% by SEM.The feature and distribution of crystals observed through the specimen for a glass-ceramics were diverse and not uniform.The crystals found in the glass-ceramics containing 70 wt% dust were hexahedral with an aspect ratio of around unity.Key words Microstructure, Borosilicate, Glas-ceramics, EAF dust, Glas transition temperature, Crystallization, Spinel,Willemite, EDS, XRDEAF dust. ... ..... ... ... .... ..
참고문헌 (13)
- "Stabilization behavior of heavy metals in the EAF dust-clay body mixtures at various sintering conditions", 39(8), pp.728~ (2002)
- "Vitrification of electric arc furnace dusts", 22, pp.945~ (2002)
- "Recycling of electrical arc furnace dust and its problems", 33 (1998), Hyundai Environment Research Institute
- "Chemical durability of glasses obtained by vitrification of industrial wastes", 21 (2001)
- "Treatment and recycling of incinerated ash using thermal plasma technology", 22, pp.485~ (2002)
- "Lightweight aggregate bloating mechanism of clay", incinerated ash, pp.2001, 38(9)[DOI]
- "Properties of heavy metal adsorption of clay minerals", 39(7), pp.663~ (2002)
- "Characteristics of sintered bodies made from the system of paper sludge ash-fly ash-clay", 38(10), pp.908~ (2001)
- "Combined glassification of EAF dust and incinerator fly ash", 50 (2003)
- "Effect of additional materials on the properties of glass-ceramic produced from incinerator fly ashes", 56 (2004)
- "Glasses" (2002), Chungmoongak, Korea
- "On formation of CaOAl 2O3-SiO2 glass-ceramics by vitrification of incinerator fly ash", 51 (2003)
- "Recovery of Zinc-rich component from steel-making process dust by triboelectrostatic separation Korean Society of Environmental Engineers" (2003)