• 제목/요약/키워드: Metal extraction

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황산용액에서 용매추출에 의한 코발트(II), 니켈(II) 및 구리(II) 분리 (Separation of Co(II), Ni(II), and Cu(II) from Sulfuric Acid Solution by Solvent Extraction)

  • 문현승;송시정;;이만승
    • 자원리싸이클링
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    • 제31권1호
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    • pp.21-28
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    • 2022
  • 폐리튬이온배터리를 고온에서 용융환원시키면 코발트, 니켈 및 구리 금속합금상을 얻을 수 있다. 이러한 금속합금상으로부터 금속을 분리회수하기 위한 공정을 개발하기 위해 코발트, 니켈 및 구리 금속을 혼합한 금속혼합물을 3% 과산화수소를 함유한 2 M 황산용액으로 침출하면 9.6%의 구리와 함께 코발트와 니켈이 모두 침출된다. 침출용액에서 Cyanex 301로 구리(II)가 선택적으로 추출되었으며, 30% 왕수로 구리(II)를 탈거했다. 구리가 분리된 여액에서 이온성액체인 ALi-SCN으로 Co(II)를 선택적으로 추출했으며, 15%의 암모니아용액으로 3단의 교차식 탈거를 통해 모두 탈거했다. 본 연구를 통해 코발트, 니켈 및 구리 금속혼합물의 황산침출액에서 용매추출로 세 금속을 분리할 수 있는 공정을 제안했다.

Removal of Potassium from Molasses by Solvent Extraction and Ion Exchange

  • Wang, Lingyun;Nam, Sang-Ho;Lee, Manseung
    • Bulletin of the Korean Chemical Society
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    • 제35권9호
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    • pp.2711-2716
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    • 2014
  • The high content of potassium in molasses limits its usage as a raw material for stock feed. Moreover, its high viscosity makes it difficult to develop an efficient removal process. In this study, ion exchange and solvent extraction experiments have been performed to investigate the removal of potassium from a mixture of molasses with water. Cationic exchange resins (AG50W-X8 and Diphonix) showed a high loading percentage of potassium but the occurrence of breakthrough in few bed volumes was a drawback to the industrial application. Among the cationic extractants (D2EHPA, PC 88A, Cyanex 272) tested in this study, saponified PC 88A was found to be the best extractant for the removal of potassium. Batch simulation studies on a three stage counter current extraction confirmed that 85% of potassium was removed from 50 wt % molasses solution in water by using saponifed PC 88A.

초임계 이산화탄소에 의한 금속 담지 활성탄으로부터 담지금속의 추출 (Extraction of Impregnated Metals from Charcoal Active Carbon with Supercritical Carbon Dioxide)

  • 이종철;류삼곤
    • 한국군사과학기술학회지
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    • 제11권5호
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    • pp.99-106
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    • 2008
  • Metal ions such as Cu and Cr were extracted from the Cu, Cr and Ag impregnated active carbon by contacting the solid surfaces with supercritical carbon dioxide(Sc-$CO_2$) containing chelating agents. About 10g of the active carbon sample were loaded in a vertical tube extractor contacting with $CO_2$ flowing from the bottom of the tube for 6hrs. The ligands used were acetyl acetone(AA) and Cyanex-302(C-302). Water and methanol were used as entrainers to study the effect of co-solvent to $CO_2$. Experimental results showed that C-302 was more effective than AA in removing Cu with the maximum extraction of 42.0wt%, while 57.6wt% of Cr was extracted with AA from the sample.

감압잔사유로부터 탈아스팔트오일의 추출 (Extraction of Deasphalted Oil from Vacuum Residue)

  • 백일현;김춘호;김성현;김영일;홍성선
    • 에너지공학
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    • 제2권1호
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    • pp.68-74
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    • 1993
  • 본 연구에서는 감압잔사유의 활용을 극대화하는 것을 목적으로 초임계 용매 추출법을 이용하여 탈아스팔트오일을 추출하였다. 초임계 용매로 n-pentane을 사용하였으며 온도와 압력 변화에 따른 추출수율과 추출된 오일 중 금속성분 및 황성분 함량의 변화가 조사되었다. 탈아스팔트오일의 추출수율은 사용한 용매의 초임계 영역에서 밀도에 크게 좌우됨이 조사되었고 추출유의 금속성분 함량은 감압잔사유에 비하여 크게 제거되었으나, 황성분 제거율은 낮았다.

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유기인산계 추출제로 합성한 이온성액체에 의한 묽은 염산용액에서 코발트(II)와 니켈(II)의 추출분리 (Solvent Extraction Separation of Co(II) and Ni(II) from Weak Hydrochloric Acid Solution with Ionic Liquids Synthesized from Organophosphorus Acids)

  • 문현승;송시정;;이만승
    • 자원리싸이클링
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    • 제29권5호
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    • pp.55-63
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    • 2020
  • 묽은 염산용액에서 이온성액체에 의한 코발트(II)와 니켈(II)의 분리를 조사하기 위해 이온성액체의 종류와 농도 및 수상의 초기 pH를 변화시켜 추출실험을 수행했다. 본 논문에서는 유기인산(D2EHPA, PC88A, Cyanex 272, Cyanex 301)을 Aliquat 336과 반응시켜 제조한 이온성액체와 Aliquat 336의 염소이온을 SCN과 치환한 이온성액체를 사용했다. 세 종류의 이온성액체(ALi-D2, ALi-PC, ALi-CY272)에 코발트(II)가 니켈(II)보다 추출이 잘 되었으며 평형 pH가 초기 pH보다 높았다. ALi-CY301의 경우 코발트(II)와 니켈(II)의 선택도는 추출조건에 의존했다. 또한 상기 이온성액체에 TBP의 첨가가 두 금속의 추출에 미치는 영향도 조사했다. 추출제로 ALi-SCN를 사용하는 조건에서 코발트(II)가 선택적으로 추출되어 두 금속을 완전히 분리하는 것이 가능했다.

단일 고형화제를 이용한 중금속류 오염 토양의 고형화/안정화 (Solidification and Stabilization of Metal(loid)s-contaminated Soils using Single Binders)

  • 박혜옥;최지연;오상화;신원식
    • 한국지하수토양환경학회지:지하수토양환경
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    • 제20권7호
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    • pp.135-147
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    • 2015
  • Remediation of metal(loid)s-contaminated sites is crucial to protect human and ecosystem. Solidification and stabilization of metal(loid)s by the binder amendment is one of the cost-effective technologies. In this study, metal (loid)s in various field-contaminated soils obtained from steel-making, metal refinery and mining tillage were immobilized by the application of single binders such as diammonium phosphate (DAP), lime, and ladle slag. The efficiency of solidification and stabilization was evaluated by Toxicity Characteristic Leaching Procedure (TCLP) and the Standard, Measurements and Testing programme of European Union (SM&T) extraction processes. In terms of TCLP extraction, the binder was effective in order of lime > DAP > ladle slag. All binders were highly effective in the immobilization of Pb, Zn, Cu, Ni, and Cd. The increased immobilization efficiency is attributed to the increase in the Step III and IV fractions of the SM&T extraction. Lime and ladle slag were highly effective in the immobilization of the metal(loid)s, however, As release increased with DAP due to competition between the phosphate originated from DAP and arsenate. A further study is needed for the better immobilization of multi metal(loid)s using binary binders.

폐광산 주변 토양 및 하천의 중금속 함량 (Heavy Metal Concentrations in Soils and Stream around the Abandoned Mine Land)

  • 전관수;이철희;원양수;정진욱;박병삼;신덕구
    • 한국환경과학회지
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    • 제8권2호
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    • pp.197-204
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    • 1999
  • The extent of heavy metal pollution in agricultural in soils near the abandoned mine land site was investigated using their concentrations from the 47 sampling sites in B mine. Samples were prepared using 0.1N HCI - Korean Standard Methods - and then analysed for Cd, Cu, Pb, As and Cr by Inductively Coupled Plasma Spectrometer. In addition, soil and mine tailing samples were sequentially extracted to investigate the chemical speciation of heavy metals in them. The soils in the vicinity of mining area are highly contaminated by heavy metals ranging up to 5.96mg Cd/kg, 253.3mg Cu/kg, 76.7mg Pb/kg, and 15.45 mg As/kg, according to the analysis of Korean Standard Methods. The heavy metal levels by the sequential extraction are much higher than its level by Korean Standard Methods, and little correlated with each other. Based on the results, it is suggested that the As pollution in agricultural soils near the AMLS should be dealt as of prior significance in establishing reclamation strategies for the area.

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서남해안 연근해저 퇴적물의 중금속 함량 및 분포 (Some heavy metal concentration of surface sediments from the southwestern coast of Korea)

  • 전수경;조영길
    • 한국환경과학회지
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    • 제11권12호
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    • pp.1299-1305
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    • 2002
  • Thirty sediment samples of the <63${\mu}{\textrm}{m}$ fraction collected from the southwestern coast of Korea were analysed for their heavy metal (Fe, Mn, Cr, Co, Cu, Ni, Zn and Pb) concentration. The results show that sediment texture plays a controlling role on the total metal concentrations and their spatial distribution. A single lM HCl extraction procedure was used in order to assess the environmental risk of heavy metals in bottom sediments. The non-residual fraction was the most abundant pool for Mn and Pb in most samples, which means that this metals are highly avaliable in these sediments. Cr, Ni, Fe, Co, Zn and Cu were mainly associated with the residual fraction, suggesting that their concentrations are controlled significantly by transport processes with the fine particles as carriers from diffuse pollution source. Concentration enrichment ratios(CER) were calculated from the non-residual contents and their values allowed us to classify the sediments according to their environmental risk.