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1
Content available Extraction Of Cobalt From Spent CMB Catalyst Using Supercritical CO2
100%
Joo S.-H. , Shin S. M.
Archives of Metallurgy and Materials
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2015
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tom Vol. 60, iss. 2B
1535--1537
EN
The metal extraction from spent CMB catalyst using supercritical CO2(scCO2) was investigated with single organic system, binary organic system and ternary organic system to extract metal ions. Leaching solution of spent CMB catalyst containing 389 mg L-1 Co2+, 187 mg L-1 Mn2+, 133 mg L-1 Na+, 14.97 mg L-1 Ca2+ and 13.2 mg L-1 Mg2+. The method consists of scCO2/ligands complexation process and metal extraction process at 60°C and 200bar. The result showed the Co and Mn was selectively extracted from Mg, Ca and Na in the ternary system of mixture of Cyanex272, DEA and Alamine304-I.
2
Content available Recovery Of Nickel From Spent Nickel-Cadmium Batteries Using A Direct Reduction Process
80%
Shin D. J. , Joo S.-H. , Wang J.-P. , Shin S. M.
Archives of Metallurgy and Materials
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2015
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tom Vol. 60, iss. 2B
1365--1370
EN
Most nickel is produced as Ferro-Nickel through a smelting process from Ni-bearing ore. However, these days, there have been some problems in nickel production due to exhaustion and the low-grade of Ni-bearing ore. Moreover, the smelting process results in a large amount of wastewater, slag and environmental risk. Therefore, in this research, spent Ni-Cd batteries were used as a base material instead of Ni-bearing ore for the recovery of Fe-Ni alloy through a direct reduction process. Spent Ni-Cd batteries contain 24wt% Ni, 18.5wt% Cd, 12.1% C and 27.5wt% polymers such as KOH. For pre-treatment, Cd was vaporized at 1024K. In order to evaluate the reduction conditions of nickel oxide and iron oxide, pre-treated spent Ni-Cd batteries were experimented on under various temperatures, gas-atmospheres and crucible materials. By a series of process, alloys containing 75 wt% Ni and 20 wt% Fe were produced. From the results, the reduction mechanism of nickel oxide and iron oxide were investigated.
3
Content available Recovery Of Electrodic Powder From Spent Nickel-Metal Hydride Batteries (NiMH)
70%
Shin S. M. , Shin D. J. , Jung G. J. , Kim Y. H. , Wang J. P.
Archives of Metallurgy and Materials
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2015
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tom Vol. 60, iss. 2B
1139--1143
EN
This study was focused on recycling process newly proposed to recover electrodic powder enriched in nickel (Ni) and rare earth elements (La and Ce) from spent nickel-metal hydride batteries (NiMH). In addition, this new process was designed to prevent explosion of batteries during thermal treatment under inert atmosphere. Spent nickel metal hydride batteries were heated over range of 300°C to 600°C for 2 hours and each component was completely separated inside reactor after experiment. Electrodic powder was successfully recovered from bulk components containing several pieces of metals through sieving operation. The electrodic powder obtained was examined by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX) and image of the powder was taken by scanning electron microscopy (SEM). It was finally found that nickel and rare earth elements were mainly recovered to about 45 wt.% and 12 wt.% in electrodic powder, respectively.
4
Content available Recovery Of Electrodic Powder From Spent Lithium Ion Batteries (LIBs)
70%
Shin S. M. , Jung G. J. , Lee W.-J. , Kang C. Y. , Wang J. P.
Archives of Metallurgy and Materials
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2015
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tom Vol. 60, iss. 2B
1145--1149
EN
This study was focused on recycling process newly proposed to recover electrodic powder enriched in cobalt (Co) and lithium (Li) from spent lithium ion battery. In addition, this new process was designed to prevent explosion of batteries during thermal treatment under inert atmosphere. Spent lithium ion batteries (LIBs) were heated over the range of 300°C to 600°C for 2 hours and each component was completely separated inside reactor after experiment. Electrodic powder was successfully recovered from bulk components containing several pieces of metals through sieving operation. The electrodic powder obtained was examined by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), and atomic absorption spectroscopy (AA) and furthermore image of the powder was taken by scanning electron microscopy (SEM). It was finally found that cobalt and lithium were mainly recovered to about 49 wt.% and 4 wt.% in electrodic powder, respectively.
5
Content available A Study On The Fabrication Of Iron Powder From Forging Scale Using Hydrogen
70%
Shin S. M. , Lee D.-W. , Yun J.-Y. , Kang C.-Y. , Wang J.-P.
Archives of Metallurgy and Materials
|
2015
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tom Vol. 60, iss. 2B
1547--1549
EN
This study was conducted to investigate the effect of hydrogen content, temperature, reaction time for the reduction of forging scale which is mainly composed of hematite (Fe2O3). All reductive reactions were performed over the temperature range of 700 to 1200°C as well as 0.1 to 1 atm of hydrogen partial pressures. The results showed that the mechanism for the reduction of iron oxides using hydrogen gas was not a simple process, but proceeded in multiple reduction stages thermodynamically. The iron oxide was almost completely reduced to metallic iron powder with 91 wt.% of iron content in the forging scale at 0.1 atm of hydrogen partial pressure. The content of iron was however found to be increased with increasing hydrogen partial pressure from 0.1 to 1 atm with regardless of temperatures. The metallic iron powder was obtained with the mean size of 100 μm and more porous structure was observed.
6
Content available Recovery Of Electrodic Powder From Spent Nickel-Metal Hydride Batteries (NiMH)
70%
Shin S. M. , Shin D. J. , Jung G. J. , Kim Y. H. , Wang J. P.
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nr 2
7
Content available Extraction Of Cobalt From Spent CMB Catalyst Using Supercritical CO2
31%
Joo S.-H. , Shin S. M.
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