INFLUENCE OF THE COMPOSITION OF PHOSPHATE ROCK ON THE AMOUNT OF WATER-INSOLUBLE PHOSPHATE IMPURITIES IN SEMI-HYDRATE PHOSPHOGYPSUM
In this work a chemical and mineral composition of phosphate rock and phosphogypsum was investigated in order to identify which impurities of phosphate rock prevent natural phosphates from decomposing in full during the production of phosphoric acid and increase the amount of water-insoluble phospha...
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| Format: | Article |
| Language: | English |
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University of Chemistry and Technology, Prague
2015-03-01
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| Series: | Ceramics-Silikáty |
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| Online Access: |
http://www.ceramics-silikaty.cz/2015/pdf/2015_01_029.pdf
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| author | Nora Kybartiene Zenonas Valancius Leskeviciene Violeta Urbonas Ludvikas |
| author_facet | Nora Kybartiene Zenonas Valancius Leskeviciene Violeta Urbonas Ludvikas |
| author_sort | Nora Kybartiene |
| collection | DOAJ |
| description | In this work a chemical and mineral composition of phosphate rock and phosphogypsum was investigated in order to identify which impurities of phosphate rock prevent natural phosphates from decomposing in full during the production of phosphoric acid and increase the amount of water-insoluble phosphate impurities in phosphogypsum. The analysis of X-ray diffraction (XRF), X-ray fluorescence (XRD), scanning electron microscopy with energy dispersive X-Ray spectrometry (SEM-EDS) and granulometry was carried out. The results showed that phosphate rocks (Kovdor and Kirovsk apatites) and the semi-hydrate phosphogypsums differ by their chemical composition. The apatites and phosphogypsums differ in the amount of the major components, as well as other components (MgO, Al2O3, SrO, BaO, ZrO2, Ln2O3). In phosphate rock, Ln2O3 can be found in the composition of the mineral monazite. The SEM-EDS analysis revealed that the minerals of the apatite group and monazite form aggregate crystals. Monazite dissolves in sulphuric and phosphoric acids very marginal, therefore it prevents the apatites from full decomposition, thus influencing the quantity of insoluble phosphates in semi-hydrate phosphogypsum. The higher is the amount of minerals containing Ln2O3 in phosphate rock, the more water-insoluble phosphates remain in phosphogypsum. It was found that influence of Ln2O3 impurity is significant higher than influence of particles size of apatite. |
| first_indexed | 2024-12-21T12:29:19Z |
| format | Article |
| id | doaj.art-87a3226f0948476e8b62516f8e080362 |
| institution | Directory Open Access Journal |
| issn | 0862-5468 1804-5847 |
| language | English |
| last_indexed | 2024-12-21T12:29:19Z |
| publishDate | 2015-03-01 |
| publisher | University of Chemistry and Technology, Prague |
| record_format | Article |
| series | Ceramics-Silikáty |
| spelling | doaj.art-87a3226f0948476e8b62516f8e0803622022-12-21T19:04:04ZengUniversity of Chemistry and Technology, PragueCeramics-Silikáty0862-54681804-58472015-03-015912936.20160310153228INFLUENCE OF THE COMPOSITION OF PHOSPHATE ROCK ON THE AMOUNT OF WATER-INSOLUBLE PHOSPHATE IMPURITIES IN SEMI-HYDRATE PHOSPHOGYPSUMNora Kybartiene0Zenonas Valancius1Leskeviciene Violeta2Urbonas Ludvikas Kaunas University of Technology, Department of Silicate Technology, Radvilenu pl.19, LT-50254, Kaunas, Lithuania Kaunas University of Technology, Department of Silicate Technology, Radvilenu pl.19, LT-50254, Kaunas, Lithuania Kaunas University of Technology, Department of Silicate Technology, Radvilenu pl.19, LT-50254, Kaunas, Lithuania In this work a chemical and mineral composition of phosphate rock and phosphogypsum was investigated in order to identify which impurities of phosphate rock prevent natural phosphates from decomposing in full during the production of phosphoric acid and increase the amount of water-insoluble phosphate impurities in phosphogypsum. The analysis of X-ray diffraction (XRF), X-ray fluorescence (XRD), scanning electron microscopy with energy dispersive X-Ray spectrometry (SEM-EDS) and granulometry was carried out. The results showed that phosphate rocks (Kovdor and Kirovsk apatites) and the semi-hydrate phosphogypsums differ by their chemical composition. The apatites and phosphogypsums differ in the amount of the major components, as well as other components (MgO, Al2O3, SrO, BaO, ZrO2, Ln2O3). In phosphate rock, Ln2O3 can be found in the composition of the mineral monazite. The SEM-EDS analysis revealed that the minerals of the apatite group and monazite form aggregate crystals. Monazite dissolves in sulphuric and phosphoric acids very marginal, therefore it prevents the apatites from full decomposition, thus influencing the quantity of insoluble phosphates in semi-hydrate phosphogypsum. The higher is the amount of minerals containing Ln2O3 in phosphate rock, the more water-insoluble phosphates remain in phosphogypsum. It was found that influence of Ln2O3 impurity is significant higher than influence of particles size of apatite. http://www.ceramics-silikaty.cz/2015/pdf/2015_01_029.pdf Phosphate rockSemi-hydrate phosphogypsumInsoluble impuritiesWater-insoluble phosphates |
| spellingShingle | Nora Kybartiene Zenonas Valancius Leskeviciene Violeta Urbonas Ludvikas INFLUENCE OF THE COMPOSITION OF PHOSPHATE ROCK ON THE AMOUNT OF WATER-INSOLUBLE PHOSPHATE IMPURITIES IN SEMI-HYDRATE PHOSPHOGYPSUM Ceramics-Silikáty Phosphate rock Semi-hydrate phosphogypsum Insoluble impurities Water-insoluble phosphates |
| title | INFLUENCE OF THE COMPOSITION OF PHOSPHATE ROCK ON THE AMOUNT OF WATER-INSOLUBLE PHOSPHATE IMPURITIES IN SEMI-HYDRATE PHOSPHOGYPSUM |
| title_full | INFLUENCE OF THE COMPOSITION OF PHOSPHATE ROCK ON THE AMOUNT OF WATER-INSOLUBLE PHOSPHATE IMPURITIES IN SEMI-HYDRATE PHOSPHOGYPSUM |
| title_fullStr | INFLUENCE OF THE COMPOSITION OF PHOSPHATE ROCK ON THE AMOUNT OF WATER-INSOLUBLE PHOSPHATE IMPURITIES IN SEMI-HYDRATE PHOSPHOGYPSUM |
| title_full_unstemmed | INFLUENCE OF THE COMPOSITION OF PHOSPHATE ROCK ON THE AMOUNT OF WATER-INSOLUBLE PHOSPHATE IMPURITIES IN SEMI-HYDRATE PHOSPHOGYPSUM |
| title_short | INFLUENCE OF THE COMPOSITION OF PHOSPHATE ROCK ON THE AMOUNT OF WATER-INSOLUBLE PHOSPHATE IMPURITIES IN SEMI-HYDRATE PHOSPHOGYPSUM |
| title_sort | influence of the composition of phosphate rock on the amount of water insoluble phosphate impurities in semi hydrate phosphogypsum |
| topic | Phosphate rock Semi-hydrate phosphogypsum Insoluble impurities Water-insoluble phosphates |
| url |
http://www.ceramics-silikaty.cz/2015/pdf/2015_01_029.pdf
|
| work_keys_str_mv | AT norakybartiene influenceofthecompositionofphosphaterockontheamountofwaterinsolublephosphateimpuritiesinsemihydratephosphogypsum AT zenonasvalancius influenceofthecompositionofphosphaterockontheamountofwaterinsolublephosphateimpuritiesinsemihydratephosphogypsum AT leskevicienevioleta influenceofthecompositionofphosphaterockontheamountofwaterinsolublephosphateimpuritiesinsemihydratephosphogypsum AT urbonasludvikas influenceofthecompositionofphosphaterockontheamountofwaterinsolublephosphateimpuritiesinsemihydratephosphogypsum |