The influence of the rate of selenium crystallization from aqueous solutions on its morphology
Selenium crystallization process from aqueous solutions was investigated at constant temperature of 357 K. Two different reducers were used, namely dissolved NaHSO3 and gaseous SO2. Experiments were conducted for solutions with different initial selenium concentration and different pH. The degree of...
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| Format: | Article |
| Language: | English |
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University of Belgrade, Technical Faculty, Bor
2002-01-01
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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/1450-5339/2002/1450-53390202033H.pdf |
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| author | Harañczyk I. Szafirska B. Fitzner K. |
| author_facet | Harañczyk I. Szafirska B. Fitzner K. |
| author_sort | Harañczyk I. |
| collection | DOAJ |
| description | Selenium crystallization process from aqueous solutions was investigated at constant temperature of 357 K. Two different reducers were used, namely dissolved NaHSO3 and gaseous SO2. Experiments were conducted for solutions with different initial selenium concentration and different pH. The degree of conversion was determined as a function of time from the weight of the sediment, and can be described by Avrami-type equation of the following form: - ln ( 1 - á) = (6.95 . 10 -3 . t )1.52 valid at constant temperature of 357 K for NaHSO3 reducer, rate constant k = 6.95.10-3 min-1, and t in minutes. When the reduction was carried out in SO2 stream, the rate constant k was found to be strongly dependent on the flow rate. Possible mechanism of the reduction process and the influence of the rate of the reduction on the morphology of the product were suggested. |
| format | Article |
| id | doaj-art-660a2a19d8ba46cfb28c87e54d5fc5fb |
| institution | Kabale University |
| issn | 1450-5339 |
| language | English |
| publishDate | 2002-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-660a2a19d8ba46cfb28c87e54d5fc5fb2025-02-02T20:48:01ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392002-01-01381-2334810.2298/JMMB0202033HThe influence of the rate of selenium crystallization from aqueous solutions on its morphologyHarañczyk I.Szafirska B.Fitzner K.Selenium crystallization process from aqueous solutions was investigated at constant temperature of 357 K. Two different reducers were used, namely dissolved NaHSO3 and gaseous SO2. Experiments were conducted for solutions with different initial selenium concentration and different pH. The degree of conversion was determined as a function of time from the weight of the sediment, and can be described by Avrami-type equation of the following form: - ln ( 1 - á) = (6.95 . 10 -3 . t )1.52 valid at constant temperature of 357 K for NaHSO3 reducer, rate constant k = 6.95.10-3 min-1, and t in minutes. When the reduction was carried out in SO2 stream, the rate constant k was found to be strongly dependent on the flow rate. Possible mechanism of the reduction process and the influence of the rate of the reduction on the morphology of the product were suggested.http://www.doiserbia.nb.rs/img/doi/1450-5339/2002/1450-53390202033H.pdfseleniumreductionaqueous solutionscrystallizationmorphology |
| spellingShingle | Harañczyk I. Szafirska B. Fitzner K. The influence of the rate of selenium crystallization from aqueous solutions on its morphology Journal of Mining and Metallurgy. Section B: Metallurgy selenium reduction aqueous solutions crystallization morphology |
| title | The influence of the rate of selenium crystallization from aqueous solutions on its morphology |
| title_full | The influence of the rate of selenium crystallization from aqueous solutions on its morphology |
| title_fullStr | The influence of the rate of selenium crystallization from aqueous solutions on its morphology |
| title_full_unstemmed | The influence of the rate of selenium crystallization from aqueous solutions on its morphology |
| title_short | The influence of the rate of selenium crystallization from aqueous solutions on its morphology |
| title_sort | influence of the rate of selenium crystallization from aqueous solutions on its morphology |
| topic | selenium reduction aqueous solutions crystallization morphology |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2002/1450-53390202033H.pdf |
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