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전웅,정대식,김효준,Chon, Uong,Jeong, Dae-Sik,Kim, Hyo-Joon 한국세라믹학회 1997 한국세라믹학회지 Vol.34 No.6
The effect of calcination temperature of Mg(OH)2 on the green density and densification of MgO was investigated. It was observed that the impure magnesium hydroxide powder showed a higher crystallization rate while it had a lower tendency of agglomeration between periclae crystallites, as compared to that of the pure magnesium hydroxide powder. In the case of calcination of the powders under 85$0^{\circ}C$, the impure powder showed the higher green and sintered density. In spite of higher green density upon the calcination over 100$0^{\circ}C$, the impure powder showed the lower sintered density, caused by exaggerated growth of the periclase crystallites. The highest sintered densities in the both powders were obtained at the calcination temperature of 100$0^{\circ}C$. And the green density was inversely proportional to the sintered density at the calcination over 100$0^{\circ}C$.
전웅,한기천,김기영,김기홍,Chon, Uong,Han, Gi-Chun,Kim, Ki-Young,Kim, Ki-Hong 한국자원리싸이클링학회 2010 資源 리싸이클링 Vol.19 No.3
리튬 이온 배터리가 빠르게 차세대 전기차의 핵심 기술이 되어감에 따라 리튬 자원에 대한 관심이 고조되고 있다. 본 고에서는 리튬 매장량, 리튬 생산 및 수요 현황을 살펴보고 리튬의 회수 기술에 대해 간략히 소개하고자 한다. There is more increasing interest in lithium resources as lithium ion batteries are rapidly becoming the technology of choice for the next generation of Electric Vehicles. In this paper, current status on lithium reserve base, lithium supply and demand is reviewed, and technology for lithium recovery is briefly introduced.
분리막 농축수에 포함된 Na를 이용한 저농도 NaOH 용액의 합성
이윤지 ( Yoon Ji Lee ),박연진 ( Youn Jin Park ),최정학 ( Jeong Hak Choi ),신원식 ( Won Sik Shin ),최상준 ( Sang June Choi ),전웅 ( Uong Chon ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.6
역삼투막을 이용한 해수담수화 과정에서 발생하는 농축수 내에는 고농도의 Na+ 이온이 포함되어 있으며, 이를 경제성 있는 NaOH 용액으로 회수하기 위해 전기분해를 적용하였다. 실험실 규모의 전기분해장치를 구성하여 실험조건의 변화에 따른 NaOH 용액의 합성농도를 비교하였다. 이온교환막의 종류 (CIMS 막, Nafion 막), 이온교환막의 전처리 유무, 농축수의 유입 유속(73 mL/min ~ 200 mL/min), 모의 농축수의 농도(1.5 M ~ 5 M), 전류(1.5 A, 2 A) 등의 인자를 변화시켜 전기분해를 수행한 결과, CIMS 막은 Nafion 막에 비하여 NaOH 용액의 합성효율은 뛰어나지만, 장시간 운전 이후에 염소가스에 대한 내구성이 떨어졌다. 또한, 모의 농축수의 Na+ 이온농도와 전류가 높을수록 NaOH 용액의 합성효율은 증가하였으나, 모의 농축수의 유입 유속이 낮을수록 합성효율은 증가하였다. Concentrated water discharged from seawater desalination process contains a high concentration of Na+ion. Electrolysis was applied to synthesize NaOH solution from the highly concentrated NaCl solution. The effect of various operating parameters of composited laboratory-scale chlor-alkali (CA) membrane cell was investigated. The operating parameters such as membrane types (CIMS and Nafion membranes), pretreatment of the membrane, flow rate (73 mL/min~200 mL/min), initial Na+ ion concentration (1.5 M, 3M and 5 M) and current (1.5A and 2A) were evaluated. It was observed that synthesis efficiency of NaOH solution with CIMS membrane was higher than that with Nafion membrane, but the durability of CIMS membrane on Cl2 gas was poor. The synthesis efficiency of NaOH solution increased with increasing initial Na+ ion concentration and current, while the efficiency decreased with increasing flow rate using Nafion membrane.