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dc.contributor.author | De Beer, Marinda | |
dc.contributor.author | Maree, Johannes Philippus | |
dc.contributor.author | Liebenberg, L. | |
dc.contributor.author | Doucet, F.J. | |
dc.date.accessioned | 2015-06-26T07:38:55Z | |
dc.date.available | 2015-06-26T07:38:55Z | |
dc.date.issued | 2014-11 | |
dc.description.abstract | The production of elemental sulphur and calcium carbonate (CaCO3) from gypsum waste can be achieved by thermally reducing the waste into calcium sulphide (CaS), which is then subjected to a direct aqueous carbonation step for the generation of hydrogen sulphide (H2S) and CaCO3. H2S can subsequently be converted to elemental sulphur via the commercially available chemical catalytic Claus process. This study investigated the carbonation of CaS by examining both the solution chemistry of the process and the properties of the formed carbonated product. CaS was successfully converted into CaCO3; however, the reaction yielded low-grade carbonate products (i.e. <90 mass% as CaCO3) which comprised a mixture of two CaCO3 polymorphs (calcite and vaterite), as well as trace minerals originating from the starting material. These products could replace the Sappi Enstra CaCO3 (69 mass% CaCO3), a by-product from the paper industry which is used in many full-scale AMD neutralisation plants but is becoming insufficient. The insight gained is now also being used to develop and optimize an indirect aqueous CaS carbonation process for the production of high-grade CaCO3 (i.e. >99 mass% as CaCO3) or precipitated calcium carbonate (PCC). | en_ZA |
dc.description.embargo | 2015-11-30 | en_ZA |
dc.description.librarian | hb2015 | en_ZA |
dc.description.sponsorship | THRIP (Technology and Human Resource for Industry Programme of the National Research Foundation (NRF)), Tshwane University of Technology (TUT), North-West University (NWU), the Council for Scientific and Industrial Research (CSIR) and the Council for Geoscience (CGS). | en_ZA |
dc.description.uri | http://www.elsevier.com/locate/wasman | en_ZA |
dc.identifier.citation | De Beer, M, Maree, JP, Liebenberg, L & Doucet, FJ 2014, 'Conversion of calcium sulphide to calcium carbonate during the process of recovery of elemental sulphur from gypsum waste', Waste Management, vol 34, no. 11, pp. 2373-2381. | en_ZA |
dc.identifier.issn | 0956-053X (print) | |
dc.identifier.issn | 1879-2456 (online) | |
dc.identifier.other | 10.1016/j.wasman.2014.07.010 | |
dc.identifier.uri | http://hdl.handle.net/2263/45795 | |
dc.language.iso | en | en_ZA |
dc.publisher | Elsevier | en_ZA |
dc.rights | © 2014 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Waste Management. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Waste Management, vol. 34, no. 11, pp. 2373-2381, 2014. doi : 10.1016/j.wasman.2014.07.010. | en_ZA |
dc.subject | Gypsum waste | en_ZA |
dc.subject | Carbonation | en_ZA |
dc.subject | Valorisation | en_ZA |
dc.subject | Calcium carbonate | en_ZA |
dc.subject | Calcium sulphide | en_ZA |
dc.title | Conversion of calcium sulphide to calcium carbonate during the process of recovery of elemental sulphur from gypsum waste | en_ZA |
dc.type | Postprint Article | en_ZA |