Case Studies in Chemical and Environmental Engineering (Dec 2024)

Using selective HCl and H2SO4 acids to extract calcium from extracted asphalt waste residues in preparation for subsequent indirect mineral carbonation

  • Michael Ambarita,
  • Yustina M. Pusparizkita,
  • Wolfgang W. Schmahl,
  • Ghani Reswara,
  • Mileno M. Putra,
  • M. Danny Pratama Lamura,
  • J. Jamari,
  • Athanasius P. Bayuseno

Journal volume & issue
Vol. 10
p. 100998

Abstract

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A substantial amount of dry solid waste residues in Indonesia produced during the extraction of asphalt-rock bitumen offers the potential for calcium recovery for reducing CO₂ emissions toward value-added carbonate minerals via indirect mineral carbonation. This study used the residue by crushing and calcining at 900 °C for 5 hours, leached with 2 M HCl and 1 M H2SO4 at 60 °C to form a calcium-rich solution, and mixed with NH4HCO3 at a pH of 11.2–12 to precipitate calcium carbonate (PCC) at varying 30–70 °C. The PCC product has substantial calcite and small vaterite with spherical morphology, potentially various applications in paper and plastic-making industries.

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