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The recovery of sulphur from waste gypsum
Thesis (PhD)--University of Pretoria, 2009.
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University of Pretoria
2013
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| _version_ | 1867613543026655232 |
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| access_status_str | Open Access |
| author2 | Landman, Marile |
| author_browse | Landman, Marile |
| author_facet | Landman, Marile |
| collection | Thesis |
| dc_rights_str_mv | © University of Pretoria 2008D541/ |
| description | Thesis (PhD)--University of Pretoria, 2009. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/24394 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:37:48.825Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/24394 The recovery of sulphur from waste gypsum Landman, Marile Strydom, C.A. (Christiena Adriana) ryneth.nengovhela@exxars.com Nengovhela, Ryneth Nkhangweleni Sulphur Waste gypsum UCTD Thesis (PhD)--University of Pretoria, 2009. Gypsum is produced as a waste product by various industries, e.g. the fertilizer industry, the mining industry and power stations. Gypsum waste disposal sites are responsible for the leaching of saline water into surface and underground water and create airborne dust. Gypsum waste is not only an environmental problem but has measurable economic value as well. However, all these environmental and economical concerns can be avoided should valuable/saleable by-products like sulphur and calcium carbonate be recovered from the low quality gypsum. The aim of this project was to evaluate a process for converting waste gypsum into sulphur. The process evaluated consists of the following stages: reduction of gypsum to calcium sulphide; stripping of the sulphide with CO2 gas and the production of sulphur. Thermal reduction study showed that gypsum can be reduced to CaS with activated carbon in a tube furnace operating at 1100º C. The CaS yield was 96%. The CaS formed was slurried in water. The reaction of gaseous CO2 with the CaS slurry leads to the stripping of sulphide to form H2S gas and the precipitation of CaCO3. The H2S generated was then reacted in the iron (IIII) and PIPco processes to form elemental sulphur. Sulphur with the purity between 96% and 99% was recovered from waste gypsum in this study. Chemistry unrestricted 2013-09-06T17:25:52Z 2009-04-07 2013-09-06T17:25:52Z 2008-09-03 2009-04-07 2009-01-21 Thesis a 2008D541/ag http://hdl.handle.net/2263/24394 http://upetd.up.ac.za/thesis/available/etd-01212009-152918/ © University of Pretoria 2008D541/ application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | Sulphur Waste gypsum UCTD The recovery of sulphur from waste gypsum |
| title | The recovery of sulphur from waste gypsum |
| title_full | The recovery of sulphur from waste gypsum |
| title_fullStr | The recovery of sulphur from waste gypsum |
| title_full_unstemmed | The recovery of sulphur from waste gypsum |
| title_short | The recovery of sulphur from waste gypsum |
| title_sort | recovery of sulphur from waste gypsum |
| topic | Sulphur Waste gypsum UCTD |
| url | http://hdl.handle.net/2263/24394 http://upetd.up.ac.za/thesis/available/etd-01212009-152918/ |