1964
DOI: 10.1021/jf60136a002
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Fertilizer Materials, Effect of Calcination on Character of Phosphate Rock

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Cited by 15 publications
(2 citation statements)
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“…The removal of carbon dioxide by calcination of carbonate apatites results in concomitant loss of excess fluorine and recrystallization of stoichiometric fluorapatite. This recrystallization to a more stable apatite results in increased cyrstallite size and decreased internal surface; these factors account for the decrease in reactivity on calcination that was observed by Freeman, Caro, and Heinly (7).…”
Section: Thermal Stabilitymentioning
confidence: 87%
“…The removal of carbon dioxide by calcination of carbonate apatites results in concomitant loss of excess fluorine and recrystallization of stoichiometric fluorapatite. This recrystallization to a more stable apatite results in increased cyrstallite size and decreased internal surface; these factors account for the decrease in reactivity on calcination that was observed by Freeman, Caro, and Heinly (7).…”
Section: Thermal Stabilitymentioning
confidence: 87%
“…The pore volume, porosity, and surface areas of calcined samples were increased with an increasing calcination temperature. Freeman et al also found that calcination above 800 °C of the phosphate ore was accompanied by a decrease in the fine pores and an increase in the coarse pores of the original rock. It was determined that phosphate samples calcined at 850 °C for 8 min have the highest surface area, pore volume, and porosity when compared to other calcined samples (Table ).…”
Section: Resultsmentioning
confidence: 95%