Direct aqueous mineral carbonation of waste slate using ammonium salt solutions

Hwanju Jo, Ho Young Jo, Sunwon Rha, Pyeong Koo Lee

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The carbonation of asbestos-containing waste slate using a direct aqueous mineral carbonation method was evaluated. Leaching and carbonation tests were conducted on asbestos-containing waste slate using ammonium salt (CH3COONH4, NH4NO3, and NH4HSO4) solutions at various concentrations. The CH3COONH4 solution had the highest Ca-leaching efficiency (17%–35%) and the NH4HSO4 solution had the highest Mg-leaching efficiency (7%–24%) at various solid dosages and solvent concentrations. The CaCO3 content of the reacted materials based on thermogravimetric analysis (TGA) was approximately 10%–17% higher than that of the as-received material for the 1 M CH3COONH4 and the 1 M NH4HSO4 solutions. The carbonates were precipitated on the surface of chrysotile, which was contained in the waste slate reacted with CO2. These results imply that CO2 can be sequestered by a direct aqueous mineral carbonation using waste slate.

Original languageEnglish
Pages (from-to)2413-2427
Number of pages15
JournalMetals
Volume5
Issue number4
DOIs
Publication statusPublished - 2015 Dec 18

Keywords

  • Ammonium salts
  • Asbestos
  • CO sequestration
  • Mineral carbonation
  • Waste slate

ASJC Scopus subject areas

  • Materials Science(all)

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