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| Francisco,Eros Artur Bohac; Prochnow,Luís Ignácio; Toledo,Maria Cristina Motta de; Ferrari,Viviane Carillo; Jesus,Sérgio Luís de. |
| Optimization in the use of phosphate rocks is important and the residues of fertilizer production in the form of crandallite may be suitable for agronomic use after calcination. With the objective of evaluating the effect of thermal treatment of the aluminous phosphates of the crandallite group as related to solubility, crystalline structure and morphology, samples from the mine residues of three Brazilian phosphate deposits (Tapira-MG, Catalão-GO, and Juquiá-SP) were collected, air-dried, and screened to 100 mesh. Sub samples were thermally treated at 300, 500, 700, and 900°C for 2 hours. Treated and untreated materials were analyzed by X-ray diffraction, scanning electronic microscopy, energy dispersive X-ray spectrometry, and for the total and soluble P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcination; Phosphate fertilizer; Phosphate impurities. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300009 |
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| Cargua Catagña,Franklin Enrique; Rodríguez Llerena,Marco Vinicio; Damián Carrión,Diego Armando; Recalde Moreno,Celso Guillermo; Santillán Lima,Guido Patricio. |
| Abstract A relationship among total organic carbon content determined by ignition loss (LOI) and DUMAS combustion methods, were perfomed in evergreen Andean eyebrow forest soils, southwestern zone of Sangay National Park- Ecuador, where three conglomerates were established as follows: (C) with five plots (P) with plots of 20 x 20 m. In each plot, five digging trenches and four soil samples were carried out at different depths: 0-10, 10-20, 20-30 and> 30 cm, respectively. It is observed that the amount of total organic carbon obtained by the DUMAS and LOI method (R2 = 0.99) does not differ significantly. However, the DUMAS total organic carbon determination methodology showed greater precision with regard to LOI, thus becoming a good alternative to be... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calcination; Combustion; DUMAS; LOI; Organic material. |
| Ano: 2017 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000300408 |
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