공업화학 (Applied Chemistry for Engineering)

  • 제33권1호
  • /
  • Pages.109-112
  • /
  • 2022
  • /
  • 1225-0112(pISSN)
  • /
  • 2288-4505(eISSN)
한국공업화학회 (The Korean Society of Industrial and Engineering Chemistry)
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Estimation of Alkali Overdosing in a Lime Neutralization Process for Acid Mine Drainage

  • Cheong, Young-Wook (Geologic Environmental Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Cho, Dong-Wan (Geologic Environmental Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Lee, Jin-Soo (Mine Reclamation Corporation) ;
  • Hur, Won (Department of Biotech & Bioengineering, Kangwon National University)
  • 투고 : 2021.11.09
  • 심사 : 2021.11.30
  • 발행 : 2022.02.10
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초록

Lime has been used for the neutralization of acidic waste because it is cheap and available in large quantities. The resulting sludge often contains a considerable amount of unreacted lime due to alkali overdosing, even during automatic neutralization processes, which mainly arises from the poor solubility of lime. The sludge cake from lime neutralization of Ilkwang Mine also contained high percentages of calcium and magnesium. The elemental content of the sludge cake was compared with those obtained from a simulation of the lime neutralization facility installed at Ilkwang Mine. A Goldsim® model estimated the degree of lime overdosing to be 19.1% based on the fractions of ferrous oxide. The analysis suggests that resolubilization of aluminum hydroxide could occur in the settling basin, in which pH exceeded 10 due to the continued dissolution of the overdosed lime. The present study demonstrated that chemical analysis of sludge combined with process simulation could provide a reasonable estimate of mass balance and chemistry in a neutralization facility for acid mine drainage.

키워드

과제정보

This work was supported by the project "Development of enhanced process to improve physico-chemical treatment efficiency of mine drainage" granted by the Mine Reclamation Corporation (Project code: 20-5205).

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