• Title/Summary/Keyword: 폐액

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High-purity Lithium Carbonate Manufacturing Technology from the Secondary Battery Recycling Waste using D2EHPA + TBP Solvent (이차전지 폐액으로부터 D2EHPA + TBP solvent를 활용한 탄산리튬 제조기술)

  • Dipak Sen;Hee-Yul Yang;Se-Chul Hong
    • Resources Recycling
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    • v.32 no.1
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    • pp.21-32
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    • 2023

  • Because the application of lithium has gradually increased for the production of lithium ion batteries (LIBs), more research studies about recycling using solvent extraction (SX) should focus on Li+ recovery from the waste solution obtained after the removal of the valuable metals nickel, cobalt and manganese (NCM). The raffinate obtained after the removal of NCM metal contains lithium ions and other impurities such as Na ions. In this study, we optimized a selective SX system using di-(2-ethylhexyl) phosphoric acid (D2EHPA) as the extractant and tri-n-butyl phosphate (TBP) as a modifier in kerosene for the recovery of lithium from a waste solution containing lithium and a high concentration of sodium (Li+ = 0.5 ~ 1 wt%, Na+ = 3 ~6.5 wt%). The extraction of lithium was tested in different solvent compositions and the most effective extraction occurred in the solution composed of 20% D2EHPA + 20% TBP + and 60% kerosene. In this SX system with added NaOH for saponification, more than 95% lithium was selectively extracted in four extraction steps using an organic to aqueous ratio of 5:1 and an equilibrium pH of 4 ~ 4.5. Additionally, most of the Na+ (92% by weight) remained in the raffinate. The extracted lithium is stripped using 8 wt% HCl to yield pure lithium chloride with negligible Na content. The lithium chloride is subsequently treated with high purity ammonium bicarbonate to afford lithium carbonate powder. Finally the lithium carbonate is washed with an adequate amount of water to remove trace amounts of sodium resulting in highly pure lithium carbonate powder (purity > 99.2%).

  • https://doi.org/10.7844/kirr.2023.32.1.21 인용 PDF

수용성 금속가공유 폐액의 생물학적 처리에 관한 연구

  • 한창민;이근희;손형식;차미선;조순자;정재원;이상준
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • 2002.05b
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    • pp.207-208
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    • 2002

  • 일반적으로 미생물은 생육조건이나 환경인자의 변화에 따라 활성과 증식속도간의 차이가 나타난다. 따라서 환경에 적용시 환경인자의 영향을 고려하여 보다 높은 분해효육 조건을 선정할 필요가 있다.

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숯불구이용 불판에서 발생되는 폐지방탄화물의 환경독성 평가

  • 배철한;이순애;김영택;박정규;이희선;황인영
    • Proceedings of the Korea Society of Environmental Toocicology Conference
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    • 2001.05a
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    • pp.134-134
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    • 2001

  • 요식업소에서 배출되는 불판 세척 폐액 속에는 폐지방탄화물이 다량 포함되어 있다. 이러한 폐지방탄화물은 수생태계 뿐만 아니라 하수처리 공정에도 악영향을 미칠 가능성이 높다고 알려져 있다. 그럼에도 불구하고, 아직 국내에서는 폐지방탄화물의 환경독성학적인 조사가 이루어지지 않은 실정이다. (중략)

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