Effect of Oxalic Acid on Heat Pretreatment for Serpentine Carbonation
| Autor: | Kyoung Won Ryu, Jun-Hwan Bang, Young Nam Jang, Wonbaek Kim, Myung Gyu Lee |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Thermogravimetric analysis
Aqueous solution Magnesium Mechanical Engineering Carbonation Inorganic chemistry Oxalic acid chemistry.chemical_element Condensed Matter Physics Decomposition Heat pretreatment chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials General Materials Science Magnesium oxalate |
| Zdroj: | MATERIALS TRANSACTIONS. 52:235-238 |
| ISSN: | 1347-5320 1345-9678 |
| DOI: | 10.2320/matertrans.m2010304 |
| Popis: | A novel pretreatment method for the mineral serpentine was proposed to develop an effective carbonation process for CO2 sequestration. Basically, the method involved preheating a mixture of oxalic acid and serpentine and the subsequent aqueous carbonation. The addition of oxalic acid was found to stimulate the decomposition of serpentine during heat treatment. X-ray diffraction analysis revealed that serpentine is transformed into magnesium oxalate and magnesium oxide by heat treatments at 200°C and 500°C, respectively. The addition of oxalic acid was found to enhance the overall carbonation reaction owing to the formation of magnesium oxide during heat treatment. Thermogravimetric analysis showed that approximately 70% of the Mg2+ was transformed into magnesium oxide. Using this method, a carbonation rate as high as 72% could be obtained by aqueous carbonation at 100°C under 4 MPa. This novel method can potentially reduce the high energy cost and unavoidable use of expensive chemicals for pH control. |
| Databáze: | OpenAIRE |
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