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- 저자 : Vu Toan Thang (검색결과 4 건)
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Vu Toan Thang,Nguyen Anh Tuan,Nguyen Viet Tiep 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.3
Wear is one of the most influential factors in profile grinding. The measuring of grinding wheel wear is costly and time consuming. We introduce a new online wear measuring method in a wet profile grinding for the inner ring groove of ball bearing. The advantage of this method is the reduction of electromagnetic influence of workpiece as well as the impact of grinding debris and cutting lubricant. Two pneumatic gauging probes are positioned at two different locations with the biggest gap in the wear value on the curved edge surface of the grind stone. When the compressed air flow is blown onto the working surface of the grinding wheel, the back pressure in the measuring chamber corresponding to the gap between the probe and the working surface of the grinding wheel can be measured. Therefore, the radial wear value of grinding wheel can be determined. Based on theoretical calculations and the establishment of its dynamic characteristic curve, it is demonstrated that the first probe measuring wear at the top of the curved edge surface of the grinding wheel with the parameters of the probe d 1 = 0.85; d 2 = 1.5; P = 4 Bar has a measurement range of 200 µm, a maximum speed ratio of 0.01 Bar/µm. The second probe used to capture wear at the margin of the curved edge surface of the grinding stone with the parameters of the probe d 1 = 0.65; d 2 = 1.6; P = 4 Bar has a measurement range of 140 µm, a maximum speed ratio of 0.03 Bar/µm. The experimental results show that the grinding wheel wear value varies at different points of the curved edge surface of the grinding wheel. In profile grinding for the inner ring groove of the 6208 ball bearing, the wear value at the edge of the curved edge surface of the grinding wheel is usually bigger than that at the top of the curved edge surface of the grinding wheel.
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김은규,송대성,Kim, Eunkyu,Vu, Thang Toan,Song, Daesung 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.4
This study presents a conceptual design of vanillin production from Kraft lignin. Most of the existing Kraft lignin is used as low-quality boiler fuel or discarded as wastewater, and only 2% or less of lignin has been refined into high-quality products. We propose the process developed in this study to utilize discarded Kraft lignin. The existing vanillin production concept process consisted of alkali oxidation using NaOH, filtration, chromatography, and crystallization. Chromatography, which is difficult to commercialize, was changed to a solvent extraction process. The recovery rate of vanillin of the proposed solvent extraction process is 92.9%, and the purity is 99.5%, which is similar to the existing chromatography process. The reason why the solvent extraction process showing similar results to chromatography can replace the existing chromatography process was analyzed.
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김은규,송대성,Kim, Eunkyu,Vu, Thang Toan,Song, Daesung 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.4
본 연구에서는 크라프트 리그닌(Kraft Lignin)을 사용해 바닐린을 생산하는 공정의 개념 설계를 진행하였다. 기존 크라프트 리그닌은 대부분 저품질의 보일러 연료로 사용되거나 폐수로 버려지고 오직 2% 이하의 리그닌만 고품질의 제품으로 정제된다. 버려지는 크라프트 리그닌을 활용하기 위해 새로운 공정을 제안하였다. 기존 바닐린 생산 개념 공정은 NaOH를 사용한 알칼리 산화, 여과, 크로마토그래피, 결정화 단계로 진행됐다. 이중 상용화가 어려운 크로마토그래피를 용매 추출 공정으로 변경하였다. 제안된 용매 추출 공정의 바닐린 회수율 92.9%, 순도 99.5%이며, 이는 기존 크로마토그래피 공정과 유사한 수준이다. 크로마토그래피와 비슷한 결과를 보이는 용매 추출 공정이 기존 크로마토그래피 공정을 대체할 수 있는 이유를 분석하였다. This study presents a conceptual design of vanillin production from Kraft lignin. Most of the existing Kraft lignin is used as low-quality boiler fuel or discarded as wastewater, and only 2% or less of lignin has been refined into high-quality products. We propose the process developed in this study to utilize discarded Kraft lignin. The existing vanillin production concept process consisted of alkali oxidation using NaOH, filtration, chromatography, and crystallization. Chromatography, which is difficult to commercialize, was changed to a solvent extraction process. The recovery rate of vanillin of the proposed solvent extraction process is 92.9%, and the purity is 99.5%, which is similar to the existing chromatography process. The reason why the solvent extraction process showing similar results to chromatography can replace the existing chromatography process was analyzed.
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폐배터리 재활용 공정 폐액 중 리튬 회수를 위한 분리 기술 고찰
송대성 ( Daesung Song ),김은규 ( Eunkyu Kim ),( Thang-toan Vu ) 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.4
In this study, candidate technologies for lithium recovery from the process waste liquid generated in the waste battery recycling process were reviewed, and technologies applicable to the process from the commercialization point of view were reviewed from a qualitative point of view. The evaporation method is difficult to apply because it requires a large-scale land and shows a low recovery rate due to the loss of Li during the concentration process. In the case of precipitation, a commercially available technology shows a high recovery rate due to the high Li/Na selectivity of phosphoric acid, but there are disadvantages in that the process is complicated due to the use of expensive phosphoric acid, requiring a recovery step, and continuous operation is impossible because solids are handled in the Li concentration process. In the case of solvent extraction, if we find an inexpensive extractant with high Li/Na selectivity, continuous operation is possible with the method used in extraction of other metals in the previous step, and when Li is concentrated, continuous operation is possible because it is in a liquid state. If it shows a similar recovery rate compared to precipitation technology, commercialization will be the most likely.
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