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- 저자 : Priyandi Kusumah (검색결과 5 건)
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Room Temperature Magnesium Electrorefining by Using Non-Aqueous Electrolyte
Jesik Park,Yeojin Jung,Priyandi Kusumah,Bonita Dilasari,Heesuk Ku,Hansu Kim,Kyungjung Kwon,Churl Kyoung Lee 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.5
The increasing usage of magnesium inevitably leads to a fast increase in magnesium scrap, and magnesium recycling appears extremely beneficial for cost reduction, preservation of natural resources and protection of the environment. Magnesium refining for the recovery of high purity magnesium from metal scrap alloy (AZ31B composed of magnesium, aluminum, zinc, manganese and copper) at room temperature is investigated with a non-aqueous electrolyte (tetrahydrofuran with ethyl magnesium bromide). A high purity (99.999%) of electrorefined magneisum with a smooth and dense surface is obtained after potentiostatic electrolysis with an applied voltage of 2 V. The selective dissolution of magnesium from magnesium alloy is possible by applying an adequate potential considering the tolerable impurity level in electrorefined magnesium and processing time. The purity estimation method suggested in this study can be useful in evaluating the maximum content of impurity elements.
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Dilasari, Bonita,Park, Jesik,Kusumah, Priyandi,Kwon, Kyungjung,Lee, Churl Kyoung The Korean Electrochemical Society 2014 한국전기화학회지 Vol.17 No.1
The corrosion behavior of stainless steel 304 (SS 304), titanium, nickel and aluminium is studied by immersion and anodic polarization tests in non-aqueous electrolytes. Tetraethyl ammonium tetrafluoroborate is used as a supporting electrolyte in the three kinds of solvents. The immersion test shows that chemical corrosion rate in propylene carbonate-based electrolyte is lower than those in acetonitrile- or ${\gamma}$-butyrolactone-based electrolytes. Surface analyses do not reveal any corrosion product formed after the immersion test. In the anodic polarization tests, a higher concentration of supporting electrolyte gives a higher current density. In addition, a higher temperature increases the current density in the active region and reduces the potential range in the passive region. SS 304 shows the highest corrosion potential while Al shows the lowest corrosion potential and the highest current density in all studied conditions. Based on the conducted corrosion tests, the corrosion resistance of metal substrates in the organic solvents can be sorted in descending order as follows: SS 304 - Ti - Ni - Al.
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Application of Ionic Liquids in Hydrometallurgy
Park, Jesik,Jung, Yeojin,Kusumah, Priyandi,Lee, Jinyoung,Kwon, Kyungjung,Lee, Churl Kyoung MDPI 2014 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.15 No.9
<P>Ionic liquids, low temperature molten salts, have various advantages manifesting themselves as durable and environmentally friendly solvents. Their application is expanding into various fields including hydrometallurgy due to their unique properties such as non-volatility, inflammability, low toxicity, good ionic conductivity, and wide electrochemical potential window. This paper reviews previous literatures and our recent results adopting ionic liquids in extraction, synthesis and processing of metals with an emphasis on the electrolysis of active/light, rare earth, and platinum group metals. Because the research and development of ionic liquids in this area are still emerging, various, more fundamental approaches are expected to popularize ionic liquids in the metal manufacturing industry.</P>
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Bonita Dilasari,박제식,Priyandi Kusumah,권경중,이철경 한국전기화학회 2014 한국전기화학회지 Vol.17 No.1
The corrosion behavior of stainless steel 304 (SS 304), titanium, nickel and aluminiumis studied by immersion and anodic polarization tests in non-aqueous electrolytes. Tetraethylammonium tetrafluoroborate is used as a supporting electrolyte in the three kinds ofsolvents. The immersion test shows that chemical corrosion rate in propylene carbonate-basedelectrolyte is lower than those in acetonitrile- or γ-butyrolactone-based electrolytes. Surfaceanalyses do not reveal any corrosion product formed after the immersion test. In the anodicpolarization tests, a higher concentration of supporting electrolyte gives a higher current density. In addition, a higher temperature increases the current density in the active region and reducesthe potential range in the passive region. SS 304 shows the highest corrosion potential whileAl shows the lowest corrosion potential and the highest current density in all studied conditions. Based on the conducted corrosion tests, the corrosion resistance of metal substrates in theorganic solvents can be sorted in descending order as follows: SS 304 - Ti - Ni - Al.
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차폐재 두께에 따른 광산폐기물의 자연방사능 수준 변화 특성
전순원,정명채,정선희,권요셉,김중열,황인호,이진수,최홍일,Netzhanova Akmaral,Saputra Dadan,Hidayat Fiki,Priyandi Kusumah,홍성현 한국자원공학회 2013 한국자원공학회지 Vol.50 No.1
The objective of this study is to evaluate the variations of natural radioactivity of mine wastes in the Boeun coal mine underlain by Okcheon black shale belt with covering materials including fly ash, soil and gravel. The total natural radioactivity was 300 CPS(count per second) per 1 kg of the mine wastes(tailings and waste rocks), and there is no radioactive variation by 0%, 10% and 20% compaction of each material. However, the radioactivity was exponentially decreased with 3, 6 and 9 cm thickness of the materials, and over 50% of the radioactivity was reduced as 6 cm topping of the materials. In addition, topping with gravel on the wastes was one of the best options in radioactivity reduction. Finally, it can be concluded that covering with 6 cm by various covering materials per 1 kg of the waste is quite enough to reduce natural radioactivity, and gravel layer plays a role in enhancing the reduction of the radioactivity from mine wastes. 이 연구의 목적은 옥천대 흑색 셰일이 분포하는 지역의 보은탄광 광산폐기물을 대상으로 플라이애쉬(fly ash), 복토재(soil for covering) 및 자갈(gravel) 등의 차폐재를 사용하여 그 두께에 따른 자연방사능의 수준 변화 특성을 평가하는 것이다. 채취한 광산폐기물(광물찌꺼기, 폐석 등) 1 kg당 자연방사능은 300 CPS(count per second)로 측정되었으며, 0%, 10%, 20%의 다짐도에 따른 변화는 미약하였다. 소형칼럼(Φ8 cm × 24 cm)에 광산폐기물 1 kg을 넣고 차폐재를 3, 6 및 9 cm로 충진하고 자연방사능 변화를 측정한 결과, 차폐재의 두께에 따라 자연방사능 값이 지수적으로 감소하였으며, 특히 6 cm로 충진한 경우 초기 자연방사능의 50% 이상을 저감할 수 있었다. 또한 차폐재별 효율을 비교한 결과, 자갈이 가장 우수하게 나타났다. 따라서 경제성과 현장 적용성을 고려한다면 광산폐기물 1 kg당 상기 차폐재를 6 cm 전후 두께로 충진할 경우 충분한 자연방사능의 차폐가 가능하며, 자갈과 함께 충진시 차폐효율은 증가할 것이라 판단된다.
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