The possibility of obtaining beta-anhydrite from waste nitrogypsum
The possibility of obtaining β - anhydrite from nitrogypsum, which is waste from a nitrocellulose plant, was investigated. It was shown by means of qualitative IR analysis that the product obtained by heating nitrogypsum for 5 hours at 700 o C was â - anhydrite. When the β- anhydrite was mixed with...
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| Language: | English |
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University of Belgrade, Technical Faculty, Bor
2004-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2004/1450-53390401089M.pdf |
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| author | Marinković S. Kostić-Pulek A. Popov S. Đinović J. Trifunović Prvoslav |
| author_facet | Marinković S. Kostić-Pulek A. Popov S. Đinović J. Trifunović Prvoslav |
| author_sort | Marinković S. |
| collection | DOAJ |
| description | The possibility of obtaining β - anhydrite from nitrogypsum, which is waste from a nitrocellulose plant, was investigated. It was shown by means of qualitative IR analysis that the product obtained by heating nitrogypsum for 5 hours at 700 o C was â - anhydrite. When the β- anhydrite was mixed with water at a W/S (water/solid) ratio of 0.54 in presence of different accelerators (CaO, mixture CaO - ash, ash, Na2SO4 and K2SO4), pastes were formed which hardened on standing. The compressive strength of the hardened samples was measured after 7 and 28 days and their composition determined by qualitative IR analysis. On the basis of these results, it was observed that a relationship exists between the composition (depending on the used accelerator) and the compression strength of the samples. Namely, the formation of large cores of double salts: syngenite (K2SO4 ⋅CaSO4 ⋅H2O) and glauberite (Na2SO4 ⋅CaSO4), in the presence of the accelerators K2SO4 and Na2SO4, respectively, was due to the rapid and complete crystallization of the dihydrate (CaSO4 ⋅2H2O). This fast crystal growth of the dihydrate resulted in high compressive strengths of these samples. In the other samples (prepared in presence of the accelerators: CaO, mixture CaO - ash and ash), dihydrate did not form and, consequently, their compressive strength was low. |
| format | Article |
| id | doaj-art-0717b3a0cf924da4acccaa26f9448065 |
| institution | Kabale University |
| issn | 1450-5339 |
| language | English |
| publishDate | 2004-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-0717b3a0cf924da4acccaa26f94480652025-02-02T10:57:14ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392004-01-014018910010.2298/JMMB0401089MThe possibility of obtaining beta-anhydrite from waste nitrogypsumMarinković S.Kostić-Pulek A.Popov S.Đinović J.Trifunović PrvoslavThe possibility of obtaining β - anhydrite from nitrogypsum, which is waste from a nitrocellulose plant, was investigated. It was shown by means of qualitative IR analysis that the product obtained by heating nitrogypsum for 5 hours at 700 o C was â - anhydrite. When the β- anhydrite was mixed with water at a W/S (water/solid) ratio of 0.54 in presence of different accelerators (CaO, mixture CaO - ash, ash, Na2SO4 and K2SO4), pastes were formed which hardened on standing. The compressive strength of the hardened samples was measured after 7 and 28 days and their composition determined by qualitative IR analysis. On the basis of these results, it was observed that a relationship exists between the composition (depending on the used accelerator) and the compression strength of the samples. Namely, the formation of large cores of double salts: syngenite (K2SO4 ⋅CaSO4 ⋅H2O) and glauberite (Na2SO4 ⋅CaSO4), in the presence of the accelerators K2SO4 and Na2SO4, respectively, was due to the rapid and complete crystallization of the dihydrate (CaSO4 ⋅2H2O). This fast crystal growth of the dihydrate resulted in high compressive strengths of these samples. In the other samples (prepared in presence of the accelerators: CaO, mixture CaO - ash and ash), dihydrate did not form and, consequently, their compressive strength was low.http://www.doiserbia.nb.rs/img/doi/1450-5339/2004/1450-53390401089M.pdfgypsumnitrogypsumβ-anhydritesyngeniteglauberite |
| spellingShingle | Marinković S. Kostić-Pulek A. Popov S. Đinović J. Trifunović Prvoslav The possibility of obtaining beta-anhydrite from waste nitrogypsum Journal of Mining and Metallurgy. Section B: Metallurgy gypsum nitrogypsum β-anhydrite syngenite glauberite |
| title | The possibility of obtaining beta-anhydrite from waste nitrogypsum |
| title_full | The possibility of obtaining beta-anhydrite from waste nitrogypsum |
| title_fullStr | The possibility of obtaining beta-anhydrite from waste nitrogypsum |
| title_full_unstemmed | The possibility of obtaining beta-anhydrite from waste nitrogypsum |
| title_short | The possibility of obtaining beta-anhydrite from waste nitrogypsum |
| title_sort | possibility of obtaining beta anhydrite from waste nitrogypsum |
| topic | gypsum nitrogypsum β-anhydrite syngenite glauberite |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2004/1450-53390401089M.pdf |
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