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정수복,채영배,현종영 한국자원공학회 2006 한국자원공학회지 Vol.43 No.2
The ultrafine grinding of talc with various additives was carried out using attrition ball mill with a laboratory scale. The additives used in dry and wet base ultrafine grinding processes were methyl alcohol, sodium diphosphate, ethylene glycol, triethanol amine, benzoic acid and calcium stearate. All of experiments were carried out by batch operation. The variations of median size of products with grinding time were measured by particle size analyzer. The energy consumption was calculated by using torque meter. The results showed that all of additives except for methyl alcohol were satisfactorily effective for the ultrafine grinding of talc. The energy consumption was reduced from 30% to 70%. 분쇄공정에서 분쇄효율의 향상 및 분쇄에너지의 저감을 위한 수단으로 분쇄조제의 사용은 매우 유용하고 경제적인 방법으로 대두되고 있는데, 본 연구에서는 활석 분쇄공정에서 다양한 종류의 분쇄조제에 대한 분쇄효율 및 분쇄에너지의 변화를 고찰하여 최적의 분쇄조제 및 첨가량 등을 도출하고자 하였다. 분쇄조제로 메틸알콜, 인산나트륨, 에틸렌글리콜, 트리에탄올아민, 벤조산, 칼슘스테아레이트 등을 사용하였는데, 메틸알콜을 제외한 모든 분쇄조제를 사용할 경우 현저히 분쇄효과가 향상되었으며, 분쇄에너지로 30~70%까지 저감이 가능함을 확인할 수 있었다. 이러한 결과는 실제 비금속광물 분체 제조 공정에 적용이 가능할 것으로 기대된다.
성주현(Seong, Joo-Hyun),정수형(Jung, Soo-Hyung) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
With recent growth of population and industry, urban development grows into grand scheme of excavation and construction in urban area. As the development progress advanced, the developments get large and deepen. With a progress of technology development in geotechnical engineering in Korea, most our grand scheme of projects follows great progress. On the other hand, some excavation in construction site caused direct or indirect event that affects the adjacent or surrounding structures by excavation from time to time. This event usually happens around residential and commercial area where underground tunnel, subway station, commercial building, and high-rises excavation site is, could lead great damage on economy as well as personal injury or human casualties. In order to prevent this event, the study has to be done with analysis on various events of excavation and its cause. In this paper, the research has collected the various excavation events and their causes to analyze on each site and event to define emphasis on surrounding environment.
정수복,안지환,채영배,김형석,현종영 한국자원공학회 2006 한국자원공학회지 Vol.43 No.3
In order to utilize coal-preparation refuse generated from domestic coal mines as a raw material for ordinary portland cement, cement clinker was prepared and its characteristics were investigated in terms of the composition and combination of raw materials, and burning conditions. The coal-preparation refuse was composed of 61.2% SiO2, 17.3% Al2O3, 3.4% Fe2O3, in which 88.3% ash, 5.0.% volatile matter, and 6.0% fixed carbon were included. Its caloric value was 494 kcal/kg. When standard LSF, SM and IM(91.0, 2.6 and 1.6) were applied as the composition rate of the mixed raw materials, it was possible to substitute the mixed raw materials by 7.2% with coal-preparation refuse and to save 54,410 kcal of energy per ton of the cement clinker. At this composition, the burnability index (BI) of the mixed raw materials was determined to be 51.4 and the prepared clinker was composed of 52.3% C3S, 24.2% β-C2S, 8.4% C3A and 10% C4AF. 석탄 광산의 선탄 공정에서 발생된 폐석을 보통포틀랜드시멘트의 원료로 활용하기 위하여 시멘트 공장의 조합 원료, 배합 조건, 소성 조건으로 보통포틀랜드시멘트 클링커의 합성 특성을 조사하였다. 선탄 폐석에는 SiO2, Al2O3, Fe2O3 성분이 각각 61.2% 17.3% 3.4% 정도 함유되어 있고, 회분이 88.3.%정도, 휘발분이 5.0.%, 고정 탄소가 6.0%정도 함유되어 있으며, 발열량은 494kcal/kg 정도이었다. 시멘트 제조 공장의 원료 배합 조건(LSF 91.0, SM 2.60, IM 1.60)으로 선탄 폐석을 조합 원료와 혼합하여 사용한 결과, 조합 원료의 7.2% 정도까지 대체 사용이 가능하였고, 시멘트 클링커 1톤 제조시 약 54,410kcal에 해당하는 연료를 절감할 수 있다. 조합 원료의 소성 지수(B. I.)는 51.4정도로 소성성이 좋으며, 합성된 클링커에는 C3S 52.3%, C2S 24.2%, C3A 8.4%, C4AF 10.0%가 함유되어 있었다.