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Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Coal cleaning residues and Fe-minerals implications.

Luis F O Silva1, Felipe Macias, Marcos L S Oliveira

  • 1Catarinense Institut of Environmental Research and Human Development-IPADHC, Capivari de Baixo, Brazil. felipeqma@yahoo.com.br

Environmental Monitoring and Assessment
|February 4, 2010
PubMed
Summary

This study investigated iron minerals in Brazilian coal mining residues, identifying major minerals like chlorite and pyrite. Findings reveal potential environmental implications from pyrite oxidation products.

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Area of Science:

  • Mineralogy
  • Environmental Science
  • Geochemistry

Background:

  • Brazilian coal mining generates residues with diverse mineral compositions.
  • Understanding iron-mineral origins and environmental impacts is crucial for waste management.

Purpose of the Study:

  • To determine the origin and distribution of iron minerals in Brazilian coal mining residues.
  • To assess the environmental implications of these iron minerals.
  • To investigate the chemical heterogeneity within the study area.

Main Methods:

  • Sampled 19 coal cleaning residue samples from five cities in Santa Catarina State, Brazil.
  • Utilized Mössbauer spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy with Energy Dispersive X-ray analysis (SEM/EDX), and Transmission Electron Microscopy (TEM).

Main Results:

  • Identified major iron minerals: chlorite, hematite, illite, and pyrite.
  • Detected minor iron minerals including jarosite, goethite, siderite, and others.
  • Pyrite was abundant in some samples (up to 10% of mineral matter).
  • Sulfate minerals like jarosite likely result from pyrite oxidation.

Conclusions:

  • The study characterized the complex mineralogy of Brazilian coal mining residues.
  • Pyrite and its oxidation products are significant components with potential environmental relevance.
  • Further research is needed to fully understand the environmental fate of these minerals.