• Title, Summary, Keyword: Metal recovery

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A Study of the Metal Recovery from the Aluminium Scrap (Al 스크랩으로부터 금속회수에 관한 연구)

  • 김준수;임병모;윤의박
    • Resources Recycling
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    • v.4 no.1
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    • pp.25-30
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    • 1995
  • In the preparatIon of reclaimed aluminium lllgot from alumimum scrap, the aluminium recovery was studied a as a function of the preliminary treatment of samples, addition of flux and melting atmosphere. AI dross is produced by an oxidation reaction at the surface of liquid metal. The recovery of AI metal increases u up to maximum 95% by adding salt up to 7%, The recovery of AI metal in the compacted chip bale without oil removal mcrease about 14% compared io non-compacted chip. In the case of the AI seed melting process, the recovery of Al metal of the crushed and compacted chip hale is 97%, In meltmg of alumimum scrap under the atmosphere of carbon and nitrogen gas, the recovery of AI metal increase, but it is decreased when the mixture of salt and carbon powder is added excessively.

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A Study on Bacterial Leaching of Low-Grade Copper Mineral(V) (저품위 동광석의 세균침출에 관한 연구 5)

  • 민봉희;박원구;이강순
    • Korean Journal of Microbiology
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    • v.12 no.1
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    • pp.25-30
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    • 1974
  • It was convinced that with a relatively small capital investment and with a low operating cost, appreciable amounts of cement copper could be produced from low-grade minerals by the application of a bacterial leaching method. For the recovery of cement copper from the impure pregnant solution, direct precipitation of copper with tin plates by a bacterial leaching method was feasible. The results obtained were as follows: 1)In order to remove the cement copper from the reducing metal, aeration and agitation method were more effective and economic than shaking method. 2)The rate of copper recovery from the pregnant solution was accerelated according to increasing quantities of reducing metal. However, the excess of reducing metal reduced the grade of cement copper. 3)Among the comparative experiments of copper recovery at each reaction temperature of $10^{\circ}C$, $20^{\circ}C$, and $30^{\circ}C$, the recovery rate of copper at $30^{\circ}C$from the pregnant solution was highest. 4)Direct cementation method on iron-containing metal was an excellent method for the recovery of cement copper in bacterial leaching.

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Effects of Welding Parameters on Weld Metal Strength and Recovery of Alloying Elements in FCAW (FCAW에서 용접변수에 따른 용접금속 강도 및 와이어 합금원소의 회수율 변화)

  • Jung, Dong-Hee;Bang, Kook-Soo;Park, Chan;Chang, Woong-Sung;Park, Chul-Gyu
    • Journal of Welding and Joining
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    • v.26 no.2
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    • pp.69-74
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    • 2008
  • 590MPa grade weldable steels were gas metal arc welded with flux cored wires. Welding parameters such as current, voltage, and speed were varied independently. Effects of each parameter on the strength and chemical composition of weld metal were investigated. Increase of voltage caused decrease of weld metal tensile strength due to the low recovery of alloying elements such as carbon and manganese. On the contrary, increase of current and speed resulted in increase of weld metal strength because of higher recovery of the alloying elements.

The Study on the Recovery Process of Zinc Metal from EAF Dust by Chemical Treatment (EAF 분전의 화학적처리에 와한 금속아연의 제조에 관한 연구)

  • Jeong, Rae-Youn;Lee, Jin-Hui
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.2
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    • pp.208-215
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    • 2010
  • EAF dust which is contained around 30% of zinc, 15% of iron and 3% of lead individually, is chemically treated by ammonium chloride, ammonia water, ammonia gas and carbon dioxide, and also tested and identified the ratios of the recovery of In by applied the variations of particle size, pH and heating temperature as well, in order to getting optimized recovery of the In metal after performing all of those processes. Experimental results showed that the rate of Zn recovery is 97% when the mixture of 1.3 of $NH_4Cl$/EAF is heated to the temperature of $400^{\circ}C$ and leached by water, and 95% recovery of In when ammonia gas and carbon dioxide is added simultaneously and adjust the 9.5 of pH to the same mixture above. For the purpose of remove the impurities in the mixed sample, which is prepared by the two samples, indicated above showing as the ratio of 95% and 97% recovery, in case of applied the cementation process to it, and also by electrolytic process, produced the In plate of 95~97%, and acquired 99-99.5% of In metal ingot finally by applied the heating process at $470{\sim}500^{\circ}C$.

The effects of current density and nickel content on copper electrowinning by energy saving system (에너지절약형 동(Cu)전해채취 및 전류밀도의 영향)

  • Lee, Hoo-In;Lee, Jae-Chun;Park, Jin-Tae;Kim, Min-Seuk;Sohn, Jeong-Soo;Koyama, Kazuya
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.386-387
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    • 2006
  • This study is about the recycling technology of scrap a PCB(printed circuit board) produced in home appliances or automobile industry. And we develop the recycling technology of cooper (Cu)which is contained to leaching solution. In stead of electrolytic collecting in existing sulphuric atmosphere, we apply process using the ammonia solution which is used in economizing energy. So m the process of electrolyzing scrap a PCB through the leaching and separation, we examine the effect of the nickel contained to the solution and the cooper degree of purity which is changed according to current density.

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Development of Metal Recovery Process for Municipal Incineration Bottom Ash (MIBA)

  • Kuroki, Ryota;Ohya, Hitoshi;Ishida, Kazumasa;Yamazaki, Kenichi
    • Resources Recycling
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    • v.28 no.3
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    • pp.21-25
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    • 2019
  • The utilization of incineration ash from municipal waste must be promoted to solve the social problem on the shortage of final disposal site. In this research, metals should be recovered to avoid the damage of the crushing machine during the utilization of incineration ash in cement industry. In fact, incineration bottom ash from municipal waste contains iron in 3-5%. Nonferrous metal and stainless steel in 1% is also included. The research and development on the physical recovery process was performed not only to remove the metals but also to recover high grade products. Metals were separated from incineration ash in Maruya Co. Ltd.. In fact, iron scrap recovered by magnetic separation can be selled. After that, mixed metal was separated from incineration ash using screen. In this research, mixed metal tried to divided copper, aluminum, brass and stainless steel using drum type magnetic separation, eddy current separation and high magnetic separation. As a result, recovered iron had an 80% for the grade. Aluminum was recovered by eddy current separation without copper and brass.

The effects of applied voltage on copper powder manufactured by electric explosion (전기폭발방식을 이용한 동(Cu) 미분 제조 및 인가전압의 영향)

  • Lee, Hoo-In;Kim, Won-Baek;Suh, Chang-Youl;Sohn, Jeong-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.474-475
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    • 2007
  • Wire electrical explosion(WEE) has been used for the production of fine metal particles. In WEE, electrical powder was stored and compressed into capacitor and released to produce fine particles through evaporation and condensation. In this study, the effect of applied voltage on the size of copper powders was investigated. High tension was added up to the explosion device by dividing 4 steps. At voltages lower than 5.2 kV, the fraction of powders finer than $44{\mu}m$ was almost negligible. The effectiveness of explosion increased sharply with increased voltage over 5.8 kV. At the highest voltage of 6.4 kV, more than 80% of explosion products were finer than $44{\mu}m$.

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Development of Pre-treatment for Tin Recovery from Waste Resources (주석 함유 폐자원의 공정부산물 전처리 기술)

  • Jin, Y.H.;Jang, D.H.;Jung, H.C.;Lee, K.W.
    • Journal of Korean Powder Metallurgy Institute
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    • v.21 no.2
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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.

Recycling of chelating agents after extraction of heavy metals contaminated in soil

  • Jung, Oh-Jin
    • Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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    • v.10 no.S_3
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    • pp.139-148
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    • 2001
  • Heavy metals such as Cu, Ni, Cd, and Pb were chemically extract from the contaminated soils using the chelating agents, EDTA and DTPA. These chemical extraction have been focused on its applicability to a wide range of soils. Results of extractive efficiency for heavy metal follow the order : Cu-EDTA $\geq$ Ni-EDTA > Pb-EDTA > Cd-EDTA > Cu-DTPA> Pb-DTPA. This result is coincided with order of conditional formation constants(Kr) of metal-chelate agent. The second study involved the recovery of the metals and EDTA from complex solutions by an electromembrane process. The overall processes of regeneration, recovery, and reuse were evaluated. The electrochemical studies showed that copper could be chosen as an electrode to plate Cd, Cu, and Pb. At least 95% of 75 of EDTA and associated Cu or Pb could be recovered by the electromembrane process. Recovery of Cd by electodeposition was not possible with the copper electrode. The percent EDTA recovery is equal to the percentage of metal electroplated from the chelates.

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