dc.contributor.author |
De Beer, Morris
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|
dc.contributor.author |
Doucet, FJ
|
|
dc.contributor.author |
Maree, JP
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|
dc.contributor.author |
Liebenberg, L
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dc.date.accessioned |
2016-02-23T08:50:54Z |
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dc.date.available |
2016-02-23T08:50:54Z |
|
dc.date.issued |
2015-08 |
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dc.identifier.citation |
De Beer, M., Doucet, F.J., Maree, J.P. and Liebenberg, L. 2015. Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste. Waste Management, vol. 46, pp 619-627 |
en_US |
dc.identifier.issn |
0956-053X |
|
dc.identifier.uri |
http://ac.els-cdn.com/S0956053X1530091X/1-s2.0-S0956053X1530091X-main.pdf?_tid=e2fa876e-d623-11e5-a337-00000aacb360&acdnat=1455788712_1d130e8e7313668fa7ffac824b506945
|
|
dc.identifier.uri |
http://hdl.handle.net/10204/8395
|
|
dc.description |
Copyright: 2016 Elsevier. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in the Waste Management, vol. 46, pp 619-627 |
en_US |
dc.description.abstract |
We recently showed that the production of elemental sulphur and calcium carbonate (CaCO3) from gypsum waste by thermally reducing the waste into calcium sulphide (CaS) followed by its direct aqueous carbonation yielded low-grade carbonate products (i.e. <90 mass% as CaCO3). In this study, we used the insight gained from our previous work and developed an indirect aqueous CaS carbonation process for the production of high-grade CaCO3 (i.e. >99 mass% as CaCO3) or precipitated calcium carbonate (PCC). The process used an acid gas (H2S) to improve the aqueous dissolution of CaS, which is otherwise poorly soluble. The carbonate product was primarily calcite (99.5%) with traces of quartz (0.5%). Calcite was the only CaCO3 polymorph obtained; no vaterite or aragonite was detected. The product was made up of micron-size particles, which were further characterised by XRD, TGA, SEM, BET and true density. Results showed that about 0.37 ton of high-grade PCC can be produced from 1.0 ton of gypsum waste, and generates about 0.19 ton of residue, a reduction of 80% from original waste gypsum mass to mass of residue that needs to be discarded off. The use of gypsum waste as primary material in replacement of mined limestone for the production of PPC could alleviate waste disposal problems, along with converting significant volumes of waste materials into marketable commodities. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Elsevier |
en_US |
dc.relation.ispartofseries |
Workflow;15518 |
|
dc.subject |
High-purity |
en_US |
dc.subject |
Calcium carbonate |
en_US |
dc.subject |
Caco(sub3) |
en_US |
dc.subject |
Gypsum waste |
en_US |
dc.subject |
Indirect carbonation |
en_US |
dc.subject |
Precipitated calcium carbonate |
en_US |
dc.subject |
Calcium sulphide |
en_US |
dc.subject |
Precipitated calcium carbonate |
en_US |
dc.subject |
Calcium sulphide |
en_US |
dc.subject |
Valorisation |
en_US |
dc.title |
Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste |
en_US |
dc.type |
Article |
en_US |
dc.identifier.apacitation |
De Beer, M., Doucet, F., Maree, J., & Liebenberg, L. (2015). Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste. http://hdl.handle.net/10204/8395 |
en_ZA |
dc.identifier.chicagocitation |
De Beer, Morris, FJ Doucet, JP Maree, and L Liebenberg "Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste." (2015) http://hdl.handle.net/10204/8395 |
en_ZA |
dc.identifier.vancouvercitation |
De Beer M, Doucet F, Maree J, Liebenberg L. Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste. 2015; http://hdl.handle.net/10204/8395. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - De Beer, Morris
AU - Doucet, FJ
AU - Maree, JP
AU - Liebenberg, L
AB - We recently showed that the production of elemental sulphur and calcium carbonate (CaCO3) from gypsum waste by thermally reducing the waste into calcium sulphide (CaS) followed by its direct aqueous carbonation yielded low-grade carbonate products (i.e. <90 mass% as CaCO3). In this study, we used the insight gained from our previous work and developed an indirect aqueous CaS carbonation process for the production of high-grade CaCO3 (i.e. >99 mass% as CaCO3) or precipitated calcium carbonate (PCC). The process used an acid gas (H2S) to improve the aqueous dissolution of CaS, which is otherwise poorly soluble. The carbonate product was primarily calcite (99.5%) with traces of quartz (0.5%). Calcite was the only CaCO3 polymorph obtained; no vaterite or aragonite was detected. The product was made up of micron-size particles, which were further characterised by XRD, TGA, SEM, BET and true density. Results showed that about 0.37 ton of high-grade PCC can be produced from 1.0 ton of gypsum waste, and generates about 0.19 ton of residue, a reduction of 80% from original waste gypsum mass to mass of residue that needs to be discarded off. The use of gypsum waste as primary material in replacement of mined limestone for the production of PPC could alleviate waste disposal problems, along with converting significant volumes of waste materials into marketable commodities.
DA - 2015-08
DB - ResearchSpace
DP - CSIR
KW - High-purity
KW - Calcium carbonate
KW - Caco(sub3)
KW - Gypsum waste
KW - Indirect carbonation
KW - Precipitated calcium carbonate
KW - Calcium sulphide
KW - Precipitated calcium carbonate
KW - Calcium sulphide
KW - Valorisation
LK - https://researchspace.csir.co.za
PY - 2015
SM - 0956-053X
T1 - Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste
TI - Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste
UR - http://hdl.handle.net/10204/8395
ER -
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en_ZA |