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Fe-Ni 합금(合金) 스크랩의 황산(黃酸) 침출액(浸出液)으로부터 Ni와 Fe의 분리(分離)
유경근,김민석,유재민,정진기,이재천,Yoo, Kyoung-Keun,Jha, Manis Kumar,Kim, Min-Seuk,Yoo, Jae-Min,Jeong, Jin-Ki,Lee, Jae-Chun 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.1
Cementation and solvent extraction processes were studied to separate nickel and iron ions from the $H_2SO_4$ leaching solution with 47 g/L $Fe(Fe^{2+}/Fe^{3+}=1.03),$, 23.5 g/L Ni and 0.90M $H_2SO_4$ which leached from Fe-Ni alloy. Iron powder was used as a reducing agent for the cementation of Ni ion from the leaching solution. The reduction percentage of Ni ion was $17{\sim}20%$ by adding 4 times stoichiometric amount of iron powder at $60{\sim}80$. This may result from the fact that the cementation of Ni ion occurred after the reduction of $Fe^{3+}$ to $Fe^{2+}$ and the neutralization of $H_2SO_4$ with iron powder. The cementation process was proved to be unfeasible for the separation/recovery of Ni ion from the leaching solution including $Fe^{3+}$ as a major component. $Fe^{2+}$ present in the leaching solution was converted to $Fe^{3+}$ for solvent extraction of Fe ion using D2EHPA in kerosene as a extractant. The oxidation of $Fe^{2+}$ to $Fe^{3+}$ was completed by the addition of 1.2 times stoichiometric amount of 35% $H_2SO_4$. 99.6% $Fe^{3+}$ was extracted from the leaching solution (23.5 g/L $Fe^{3+}$) by 4 stages cross-current extraction using 20 vol.% D2EHPA in kerosene. $NiSO_4$ solution with 98.5% purity was recovered from the $H_2SO_4$ leaching solution of scrapped Fe-Ni alloy. 주요 성분으로서 철$(Fe^{2+}/Fe^{3+}=1.03)$ 47g/L, 니켈; 23.5g/L, 0.90M $H_2SO_4$의 조성을 갖는 철-니켈 합금 스크랩의 황산 침출액으로부터 시멘테이션법과 용매추출법으로 니켈과 철 이온을 분리하는 연구를 수행하였다 침출액으로부터 니켈 이온의 시멘테이션을 위하여 철 분말이 환원제로 사용되었다. $60{\sim}80^{\circ}C$에서 4.0 당량의 철 분말을 투입하였을 때 니켈 이온의 환원율은 $17{\sim}20%$에 불과하였으며, 이것은 니켈 이온의 환원석출이 $Fe^{3+}$의 환원반응과 황산의 중화반응이 완료된 후에 시작되었기 때문이다. 이로부터 주성분으로 $Fe^{3+}$를 함유하고 있는 침출액으로부터 니켈 이온의 분리회수에 있어서 시멘테이션은 비효율적임이 확인되었다. D2EHPA를 추출제로 사용하는 철 이온의 용매추출을 위하여 $Fe^{2+}$는 $Fe^{3+}$로 전환시켰다. 1.2 당량의 35% $H_2O_2$를 첨가함으로서 침출액에 존재하는 모든 $Fe^{2+}$는 $Fe^{3+}$로 산화되었다. 20 vol.% D2EHPA를 사용하여 cross-current 방식으로 침출액(23.5 g/L $Fe^{3+}$)으로부터 $Fe^{3+}$의 용매추출을 행하였을 때, 4단 추출에서 99.6%의 $Fe^{3+}$를 추출하여 제거할 수 있었으며 순도가 98.5%인 황산니켈 용액이 얻어졌다
지속적 수익 확보를 위한 민자철도사업 모델 제안에 관한 연구
박찬송(Chan Song Park),유재민(Jae Min Yoo),구자경(Ja Kyung Koo),이태식(Tai Sik Lee) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The railway works in Korea were developed continually after opening the Seoul-Incheon Line in 1899. However, demand of a railway was decreased by opening the Gyeongbu expressway and generalization of automobile. The railway works had been changed due to the spread of metro lines and a development of the bullet train which to make reduce the time to move between regions. The location of railway station buildings has become an important index to decide areas of economic development and a requirement for choice of residence. However, the railway projects have risks more than highway projects because it is based on wrong demanding forecasting and has to accompany a sustainable train service periodically. For this reason, it will be suggested by this study that the PPI model is based on a model for earnings through the development of railway areas and a subsidiary enterprise.
산화아연(酸化亞鉛)의 탄소열환원반응(炭素熱還元反應)에서 산화철(酸化鐵)의 영향(影響)
김병수,박진태,김동식,유재민,이재천,Kim, Byung-Su,Park, Jin-Tae,Kim, Dong-Sik,Yoo, Jae-Min,Lee, Jae-Chun 한국자원리싸이클링학회 2006 資源 리싸이클링 Vol.15 No.4
대부분 전기로 분진 처리공정은 전기로 분진으로부터 아연을 회수하기 위하여 전기로 분진에 함유된 산화아연의 환원제로 탄소를 사용한다. 본 연구에서는 산화아연의 탄소열환원반응에 관한 전기로 분진의 주성분 중의 하나인 산화철의 영향에 대하여 속도론적으로 조사되었다. 실험은 반응온도 1173 K-1373 K 범위에서 중량감량법을 이용하여 수행되었다. 실험결과, 적절한 량의 산화철 첨가는 산화아연의 탄소열환원반응 속도를 증진시키는 것으로 나타났다. 이것은 산화철이 산화아연의 탄소열환원반응에서 탄소의 gasification 반응을 촉진시키기 때문으로 관찰되었다. 표면화학반응이 율속인 shrinking core model 1173 - 1373 K 범위에서 고체 탄소에 의한 산화아연의 환원반응 속도 데이터를 분석하는데 유용한 것으로 분석되었다. ZnO-C 반응계에서 활성화 에너지는 224kJ/mol (53 kcal/nol)로, $ZnO-Fe_{2}O_{3}-C$ 반응계에서 활성화 에너지는 175kJ/mol(42kca1/mol)로 그리고 ZnO-밀스케일-C 반응계에서 활성화 에너지는 184 kJ/mol (44 kcal/mol)로 각각 계산되었다. Most electric arc furnace dust (EAFD) treatment processes to recover zinc from EAFD employ carbon as a reducing agent for the zinc oxide in the EAFD. In the present work, the reduction reaction of zinc oxide with carbon in the present of iron oxide was kinetically studied. The experiments were carried out at temperatures between 1173 K and 1373 K under nitrogen atmosphere using a weight-loss technique. From the experimental results, it was concluded that adding the proper amount of iron oxide to the reactant accelerates the reaction rate of zinc oxide with carbon. This is because iron oxide in the reduction reaction of zinc oxide with carbon promotes the carbon gasification reaction. The spherical shrinking core model for a surface chemical reaction control was found to be useful in describing kinetics of the reaction over the entire temperature range. The reaction has an activation energy of 53 kcal/mol (224 kJ/mol) for ZnO-C reaction system, an activation energy of 42 kcal/mol (175 kJ/mol) for $ZnO-Fe_{2}O_{3}-C$ reaction system, and an activation energy of 44 kcal/mol (184 kJ/mol) for ZnO-mill scale-C reaction system.
무기체계 연구개발단계에서의 체계적인 FMEA 실행 방법
안동근(Dong Geun Ahn),유재민(Jae Min Yoo),장중순(Joong Soon Jang) 한국신뢰성학회 2021 신뢰성응용연구 Vol.21 No.1
Purpose: This paper proposes methods and procedures to effectively identify and select potential failure modes in the performance of faliure mode and effect analysis (FMEA). Specifically, a method is proposed to perform FMEA with emphasis on deriving failure mechanisms. Methods: The failure mechanism is known for a design change or improvement preventing recurrence and proactive. Therefore, it is important in designing FMEA to derive failure mechanisms and potential failure modes. This paper presents methods and procedures to derive failure mode and failure mechanism by analyzing past failure cases, usage/environmental condition parts (material), and interaction. Results: The effective design FMEA implementation procedure in the inorganic system development phase was described through the design FMEA practice case for antenna circuit card assembly and HL motor assembly among the drives used in induction weapon systems. Conclusion: The effectiveness of new identification of failure modes can be identified that the existing FMEA had not predicted by applying the proposed effective FMEA implementation methods and procedures to the weapon system development model.