Effect of temperature on phase transformation and leaching behavior of acid mine drainage sludge

研究成果: Article査読

抄録

A large amount of sludge is generated from the neutralization of acid mine drainage (AMD) in Japan, which may cause severe environmental problems. This study showed there is potential to reuse such sludge in ceramic materials by thermal treatment. We sampled and characterized two types of iron-rich Japanese AMD sludge. Their phase compositions in the temperature range of 9001200°C were identified by X-ray diffraction. ¡-Fe 2 O 3 was the main crystalline phase in all sludge samples after thermal treatment. This can be used in ceramic enamels, porcelain bodies, and ferrite ceramics production. The results of leaching tests using acetic acid solution and distilled water as extraction fluids suggested that the stability of AMD sludge can be increased to a certain degree by thermal treatment; however, amorphous aluminosilicates formed by Al and Si impurities at lower temperatures weakened its stability. The enhanced mobility and volatilization of As impurity by thermal treatment also limits the application of AMD sludge. Applications that are insensitive to Al and Si impurities and products with higher arsenic stability are required when using sludges with high contents of impurities.

本文言語English
ページ(範囲)61-67
ページ数7
ジャーナルMaterials Transactions
60
1
DOI
出版ステータスPublished - 2019

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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