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현종영,정수복,채영배,김병수,Hyun, Jong-Yeong,Jeong, Soo-Bok,Chae, Young-Bae,Kim, Byung-Su 한국자원리싸이클링학회 2005 資源 리싸이클링 Vol.14 No.2
화력발전소의 배연탈황공정에서 발생된 탈황석고의 용도확대 및 천연 무수석고의 대체 가능성을 조사하기 위하여 탈황석고로부터 건식 열처리법에 의한 무수석고의 제조특성 및 탈황 무수석고에 대하여 시멘트 및 콘크리트 2차 제품으로의 적용 특성을 조사하였다. 탈황석고로부터 Ⅱ형 무수석고의 상전이는 700$^{\circ}C$ 부근에서 완전히 종료되었고, 이러한 Ⅱ형 무수석고의 상전이 과정에서 입자크기의 변화 등을 확인할 수 있었다. 천연 무수석고와 탈황 이수석고로부터 제조된 무수석고는 화학성분 조성, 입자크기, 열적특성 등의 물성이 유사하였다. 무수석고를 시멘트나 콘크리트 2차 제품에 적용시킬 때 부식문제를 발생시킬 수 있는 황산기(SO$_4^{2-}$)의 용출실험 결과, 700$^{\circ}C$에서 1시간 열처리로 제조된 탈황 무수석고는 천연 무수석고에 비하여 황산기의 용출량이 약 50 wt.% 감소됨을 확인할 수 있었고, 소석회(Ca(OH)$_2$) 3 wt.%의 첨가에 의해 황산기의 용출량이 천연 무수석고에 비하여 약 70 wt.% 감소시킬 수 있었다. 탈황 무수석고를 시멘트 및 콘크리트 2차 제품에 적용시킨 결과, 압축강도 등의 물성이 천연무수석고에 비하여 동등 또는 우수함을 확인할 수 있었다. The manufacture property of anhydrous calcium sulfate (anhydrite Ⅱ) from flue gas desulfurization (FGD) gypsum discharged from domestic thermoelectric power plants to apply as an auxiliary material of cement and concrete by high temperature treatment were investigated. The FGD gypsum was completely converted to anhydrite Ⅱ at the temperature of 700$^{\circ}C$ and the retention time of 1 hr. In the phase transformation process, particle size was also changed. The chemical composition, particle size and heat property of anhydrite Ⅱ made from the FGD gypsum were similar to them of natural gypsum. In the leaching test of sulfate ion (SO$_4^{2-}$) at the temperature of 90$^{\circ}C$ and the retention time of 1 hr, the amount of leached SO$_4^{2-}$ for the anhydrite Ⅱ that was sintered at 700$^{\circ}C$ for 1 hr was about 50 wt.% based on that of natural gypsum. In addition, the amount of leached SO$_4^{2-}$ for the anhydrite Ⅱ by adding the slaked lime of 3 wt.% decreased about 70 wt.% comparing with that of natural gypsum. In the application test, the compressive strength of cement and concrete manufactured by using the anhydrite Ⅱ as an auxiliary material were similar or superior compared with them of cement and concrete done by natural gypsum as an auxiliary material.
현종영,정수복,채영배,Hyun Jong-Yeong,Jeong Soo-Bok,Chae Young-Bae 한국자원리싸이클링학회 2005 資源 리싸이클링 Vol.14 No.4
석란광산에서 발생되는 선탄폐석을 효율적으로 이용하기 위하여 세라믹스 원료 소재로의 활용 가능성을 고찰하였다. 석탄폐석의 첨가량이 증가함에 따라 소성 시험편의 소성수축률이 저하되고, 압축강도는 약간 감소하는 등의 효과와 선탄페석에 함유되어 없는 탄소분의 연소에 의한 기공의 증가로 제품의 경량화도 가능한 것으로 판단되었다. 선탄폐석의 첨가량을 변화시켜 $1,150^{\circ}C$ 이상에서 소성한 경우 흡수율은 $10\;wt\%$ 이하를 나타내었고, 압축강도는 모두 21MPa이상으로 KS L 4201에서 규정한 1종 점토벽돌의 기준에 모두 적합함을 확인할 수 있었다. In this study, the utilization possibility of coal-preparation refuse emitted from Hwasun coal mine in Korea as a raw material for ceramic body was investigated. The firing shrinkage ratio of ceramic specimen made from the coal-preparation refuse was reduced with increasing the addition amounts of that, while the compressive strength was slightly decreased. The weight of ceramic body was also reduced because carbon contained in the coal-preparation refuse was burn by fring. The water adsorption ratio of the ceramic specimen was under 10 wt%, and the compressive strength of that was over 21 MPa at over $1,150^{\circ}C$ for 2 hr. Therefore, it was possible to make the 1st garde clay brick of KS L 4201 from the coal-preparation refuse.
벤토나이트로부터 몬모릴로나이트의 선택적 분리를 위한 습식 고순도화
김완태 ( Wan Tae Kim ),채영배 ( Young Bae Chae ),정수복 ( Soo Bok Jeong ),임정한 ( Jung Han Rim ) 한국광물학회 2002 광물과 암석 (J.Miner.Soc.Korea) Vol.15 No.4
Wet purification process for the selective separation of montmorillonite from Gampo 13 and 35 bentonite ores was studied using physical processes such as ultrasonic scrubbing, decantation and centrifugation. Ultrasonic Scrubbing of Gampo 13 and 35 bentonite ores was revealed excellent result at 7 wt.% of slurry density and was almost finished within 30 minutes in the sample of Gampo 13 and 10 minutes in the sample of Gampo 35, respectively. After decantation, approximately 52 wt,% from the bentonite of Gampo 13 and 64wt.% from the bentonite of Gampo 35 were recovered as purified products and the CEC was reached up to 119.4 meq/100 g and 124.5 meq/100 g, respectively. Particle separation by centrifugation showed that most of the impurity minerals such as quartz and feldspar were removed within the condition of 1.000 rpm.