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Metals 2015, 5(4), 2413-2427; doi:10.3390/met5042413

Direct Aqueous Mineral Carbonation of Waste Slate Using Ammonium Salt Solutions

1
Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea
2
Department of Earth and Environmental Sciences, Korea University, Seoul 02841, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Suresh Bhargava, Mark Pownceby and Rahul Ram
Received: 18 October 2015 / Revised: 9 December 2015 / Accepted: 15 December 2015 / Published: 18 December 2015
(This article belongs to the Special Issue Hydrometallurgy)
View Full-Text   |   Download PDF [1156 KB, uploaded 18 December 2015]   |  

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. View Full-Text
Keywords: CO2 sequestration; mineral carbonation; waste slate; ammonium salts; asbestos CO2 sequestration; mineral carbonation; waste slate; ammonium salts; asbestos
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jo, H.; Jo, H.Y.; Rha, S.; Lee, P.-K. Direct Aqueous Mineral Carbonation of Waste Slate Using Ammonium Salt Solutions. Metals 2015, 5, 2413-2427.

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