Towards ambient pressure leaching of boehmite through mechanical activation
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
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| Title |
Towards ambient pressure leaching of boehmite through mechanical activation
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| Creator |
Alex, T C
Kumar, Rakesh Roy, S K Mehrotra, S P |
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| Subject |
Materials Science
Metallurgy |
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| Description |
This paper explores the possibility of manoeuvring the reactivity of boehmite through mechanical activation (MA) for enhancing the solid/liquid reaction between boehmite and NaOH. Synthetic boehmite, prepared by thermal dehydroxylation of gibbsite, used in this study has been characterised by a large specific surface area (similar to 264 m(2)/g). A planetary mill has been used for MA. Boehmite dissolution during caustic leaching (temperature: 70-90 degrees C, Na2O concentration: 180 g/l) has been found to increase with the extent of MA. Energy accumulated in the solid (boehmite) structure makes its dissolution in aqueous phase easy. Significantly high dissolution (similar to 23 g of boehmite in 210 ml of 180 g/l Na2O solution) has been achieved at atmospheric pressure condition (90 degrees C) for 240 min milled sample. Kinetic analysis of the leaching data of boehmite milled for different durations (up to 240 min) has shown that the value of apparent activation energy for boehmite dissolution decreases with the extent of MA. Analysis of the results shows that MA has larger influence on dissolution than rise in leaching temperature. An attempt has been made to separate the effect MA from that of surface area. (C) 2014 Elsevier B.V. All rights reserved
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| Publisher |
Elsevier
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| Date |
2014-04
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://eprints.nmlindia.org/6939/1/2014-alex-99-106.pdf
Alex, T C and Kumar, Rakesh and Roy, S K and Mehrotra, S P (2014) Towards ambient pressure leaching of boehmite through mechanical activation. Hydrometallurgy, 144 (IF-2.224). pp. 99-106. |
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| Relation |
http://eprints.org/6939
http://eprints.nmlindia.org/6939/ |
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