• Nuclear Engineering and Technology
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• 제55권9호
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• pp.3291-3300
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• 2023

Recently molybdenum alloys have been introduced as accident tolerating materials for cladding of fuel rods. Molybdenum element has seven stable isotopes with different neutron absorption cross section used in various fields, including nuclear physics and radioisotope production. This study presents separation approaches for all intermediate isotopes of molybdenum element by squared-off cascades using a newly developed numerical code with Salp Swarm Algorithm (SSA) optimization algorithm. The parameters of cascade including feed flow rate, feed entry stage, cascade cut, input feed flow rate to gas centrifuges (GCs), and cut of the first stage are optimized to maximize both isotope recovery and cascade capacity. The squared off and squared cascades are studied, and the efficiencies are compared. The results obtained from the optimization showed that for the selected squared off cascade, Mo⁹⁴ in four separation steps, Mo⁹⁵ in five steps, Mo⁹⁶ in six steps, Mo⁹⁷ in seven steps, and Mo⁹⁸ in two steps are separated to the desired concentrations. The highest recovery factor is obtained 63% for Mo⁹⁴ separation and lowest recovery factor is found 45% for Mo⁹⁵.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 추계학술대회 논문집
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• pp.185-189
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• 2001

A study on the new active circulation type oil-water separation system including buoyancy type guidance system was carried out in this paper. Oil-water separation system is composed of several oil separation steps. Buoy type oil guiding system was developed based on the difference of buoyance of water and oil. The design speed of this vessel is 25 knots.

• 상하수도학회지
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• 제28권1호
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• pp.135-142
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• 2014

The performance of inorganic sludge separation system is evaluated. Anaerobic digester effluent sludge is used for feed sludge of this system and hydrocyclone is used for inorganic sludge separation. For phosphorus removal and recovery $MgCl_2$ is pumped into MAP growth tank, a component of inorganic sludge separation system. Using this system inorganic sludge which contained less than 40 % of organic matter can be discharged stably and the maximum amount of separated inorganic sludge is 13.4 % of influent sludge based on dry solid. The amount of phosphorus recovered as MAP(as P) is 16.7 % to influent T-P.

• 한국막학회:학술대회논문집
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• 한국막학회 1994년도 추계 총회 및 학술발표회
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• pp.1-6
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• 1994

Many useful biomaterials like enzymes are contained in yeast cells. However, the release of these intracellular biomateriais from the cells is required to recover them with hot water, solvent or various cell breakage methods of mechanical or non mechanical ones. The cell lysis or breakage of yeast is usually made by solvent like ethyl acetate and mechanical disintrgration with high pressure homogenizer or agitating beads mill. The separation of cell debris (i.e. solid liquid separation) is done by centrifuge or membrane depending on the recovery conditions. The features of both separation methods are shown in Tables 1 and 2. As it is often difficult to obtain a clear supernatant by centrifuge from the suspension containing cell debris, the membrane separation is also often used to gel a clear supernatant. In this report we introduce the several applications of membrane separation to separate the cell debris of yeast disintegrated chemically or mechanically and to recover the intracellular biomaterials.

• 한국지하수토양환경학회지:지하수토양환경
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• 제20권5호
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• pp.41-46
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• 2015

Three types of experiments, based on the physical properties of oily sludge landfilled soil, were conducted to recover total petroleum hydrocarbons (TPH) from the soil. These experiments included gravity separation, solvent extraction using water, and air floatation. The oil portion was not easily separated from the wet (raw) soil because water molecules aggregate the soil particles, despite the fact that the soil was sandy. However, the drying and grinding processes destroyed the aggregates, causing the TPH recovery to increase to approximately 60% when air floatation was used. The drying process decreased the specific gravity of the soil sample, thereby enhancing the overall recovery of TPH from the soil. Although thermal desorption and/or incineration are common choices for heavily dumped sites, physical separation can recover the oil portion instead of simply removing it.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 추계학술대회
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• pp.447-450
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• 2006

Hydrogen separation from multi-component mixture gases by the four-bed PSA process was studied experimentally and theoretically using layered bed of activated carbon and zeolited 5A. Effects of the adsorption time, the linear velocity on the process performance were investigated. The adsorption time and linear velocity affected the purity and recovery of the product $H_2$ purity is increases according as the adsorption time and linear velocity decrease; however, $H_2$ recovery shows an opposite phenomena to the purity. PSA process simulation studied to find optimum operation condition. In the results, 50sec adsorption time, 3cm/s linear velocity might be optimal values to obtain more than 99.999% purity and 65% recovery hydrogen.

• 멤브레인
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• 제22권2호
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• pp.77-94
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• 2012

내열성, 용매 저항성의 특징을 갖는 다공성 세라믹 소재를 이용한 무기 멤브레인이 기체분리(수소 분리, 이산화탄소 분리 등), 액체 분리(수처리, 폐수처리, 유기용매 분리 등) 등 여러 가지 분야로 그 응용이 확대되고 있다. 본 논문에서는 다공성 세라믹 멤브레인의 소재, 제조 방법에 따른 멤브레인의 구조 제어 및 성능 평가에 관한 연구를 소개하고, 멤브레인의 세공 크기에 따른 구조, 멤브레인의 특성을 이용한 여러 가지 기체 분리 및 액체 분리에 관한 연구 동향을 정리하였다.

• 한국분말재료학회지
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• 제21권2호
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• pp.142-146
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• 2014

Fundamental experiences have been studied for development of pre-treatment process of Sn by-products such as solders. Dry and wet separation/recovery processes were considered by the differences of physical properties. The by-products, which are analyzed by solder metal and oxides. The metal and oxide were simply separated by dry ball-milling process for 12 hours, after that recovery metal powder might be reusable as lead or lead-free solders. In terms of wet separation process, samples were dissolved in $HNO_3+H_2O_2$ and the precipitation were analyzed by $SnO_2$. Overall efficiency of recovery might be increasing via developing simple pre-treatment process.

• 자원리싸이클링
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• 제12권5호
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• pp.36-41
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• 2003

슬래그는 철분함량이 높아 자원으로의 활용이 가능하나 시장상황에 따라 매립되는 등 재활용이 활발히 이루어지지 않은 실정이다. 따라서 본 연구에서는 슬래그의 재활용이 즘 더 용이하도록 슬래그 내에 존재하는 철분 회수의 중요한 방법인 자력선별 방안에 대하여 고찰하였다. 수재 슬래그, 수냉 전로 슬래그, 공냉 전로 슬래그를 시료로 사용하였고 자장의 세기, 드럼의 회전속도, 슬래그의 투입량에 따른 철분 회수량에 대하여 조사하였다. 철분함량이 적은 수재슬래그는 피더의 진동수 및 드럼의 회전수가 느릴수록 회수율이 증가하였으며 0.5mm 이상의 입도에서 자력선별시 고품위의 철분을 얻을 수 있었다. 수냉의 전로 슬래그의 경우 피더의 진동수가 빠를수록, 드럼의 회전수가 느릴수록 회수율이 증가하는 것으로 조사되었고 입도의 크기가 작아질수록 입도별 회수율이 증가하는 것으로 관찰되었다. 공냉의 전로 슬래그는 피더의 진동수가 낮은 경우 드럼의 회전수가 감소할수록, 높은 경우는 드럼의 회전수가 증가할수록 회수율이 증가하는 것으로 나타났다. 또한 자력선별시 자장의 세기를 증가시키면 회수율은 증가하나 금속철 이외의 철 화합물의 혼입이 많아져 품위가 낮아지는 것으로 관찰되었다.

• 자원리싸이클링
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• 제16권5호
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• pp.51-56
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• 2007

플라스틱은 아주 유용한 물질로서 우리 일상생활에 폭넓게 이용되고 있다. 국내에서는 약 400 만톤의 폐플라스틱이 발생되고 있지만 재활용율은 30% 이하로 대부분 소각이나 매립에 의해 처리되고 있다. 따라서 폐플라스틱을 재활용할 수 있는 재질분리 기술개발 필요한 실정이다. 본 연구에서는 폐플라스틱 종말품으로부터 PET 회수를 위한 마찰하전 정전선별이 수행되었다. 하전특성 연구결과에 의하면, PET와 PVC의 하전극성과 하전량은 HDPE와 PP의 하전물질 그리고 상대습도가 낮을수록 효과적이었다. HDPE 싸이클론 하전장치를 이용한 재질분리 실험결과, PET의 품위와 회수율은 전극전압 30 kV 이상, 분리대위치 -2cm의 조건에서 각각 96.8%와 85.0%로 얻어졌으며, 분리대의 위치(-6cm)에 따라 PET 회수율이 24% 감소하지만 품위를 98.5%까지 분리할 수 있는 기술을 개발하였다.