Thermal Stability, Thermal Decomposition of High-Analysis Fertilizers Based on Ammonium Phosphate

Guerrant, G O; Brown, Donald E.

doi:10.1021/jf60142a002

Cited by 16 publications

(6 citation statements)

References 3 publications

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“…A comparison of our data with those of other researchers [2][3][4][5] (Table 5) shows that T~ and Tma ~ decrease when a fluidized bed is used. The differences are marked in some cases.…”

Section: Discussionsupporting

confidence: 61%

Study of the thermal decomposition of solids in a fluidized bed, II

Kröbl

Margineanu²,

Liteanu

1970

Journal of Thermal Analysis

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In order to eliminate the errors of the TG method with a static layer, and to determine the infuence of the heating rate, the composition of the carrier gas and the particle size of the solids, a method of thermal gas evolution from a fluidized bed (FTGE) with continuous and linear increase of temperature was worked out and the thermal decomposition of diammonium hydrogen phosphate was followed. This method gives reproducible results and makes possible the determination of the apparent activation energies and kinetic parameters.

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“…A comparison of our data with those of other researchers [2][3][4][5] (Table 5) shows that T~ and Tma ~ decrease when a fluidized bed is used. The differences are marked in some cases.…”

Section: Discussionsupporting

confidence: 61%

Study of the thermal decomposition of solids in a fluidized bed, II

Kröbl

Margineanu²,

Liteanu

1970

Journal of Thermal Analysis

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“…The endothermic peaks located at approximately 200°C were related to MAP decomposition (Abdel‐Kader et al, 1991). Monoammonium phosphate is stable up to 200°C and degrades above this temperature (Guerrant and Brown, 1965). Peaks of approximately 200°C were observed in all three fertilizers, before and after incubation (Fig.…”

Section: Resultsmentioning

confidence: 99%

Chemical, Thermal, and Spectroscopic Analysis of Organomineral Fertilizer Residue Recovered from an Oxisol

Sakurada¹,

Muniz²,

Sato³

et al. 2019

Soil Science Soc of Amer J

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The joint use of analytical techniques helps us to better understand the characteristics and chemical processes that may influence the efficiency of fertilizers. Differential scanning calorimetry, X‐ray diffractometry, and Fourier transform infrared spectroscopy techniques are helpful in capturing the differences in compounds and mineral presence in fertilizers before and after application to the soil. Organomineral and inorganic fertilizers have different capacities to make P available in the soil. Different methods of organomineral fertilizer production result in different capacities to provide P, so that the granulation process resulted in lower P solubility than the granule mixture. Understanding the behavior of different organomineral phosphate fertilizers will help the delivery of available P to plants. We evaluated differences in the characteristics and P availability of granulated organomineral fertilizer (OG), an organomineral granule mixture (OM), and an inorganic granule mixture (MM) and their residues (OGr, OMr, and MMr, respectively) after four 35‐d cropping cycles. Soil‐available P content, X‐ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and soluble P content analyses of the fertilizers and residues were performed. The OM soil had higher available P content after the crops than those with OG and MM. The OGr had the highest total P, water‐soluble P, and P soluble in neutral ammonium citrate and water and a more intense DSC peak related to the remaining monoammonium phosphate than OMr and MMr, indicating that OG had the highest capacity to provide P over time. The XRD and FTIR analyses showed the predominance of aluminum phosphates and the possible formation of low‐solubility compounds in all residues. Differential scanning calorimetry showed a change in the characteristics of the organic matter of OG and OM after application, indicating that these fertilizers have different solubilities and capacities to make P available. The granulation process of OG results in lower capacity to provide P than the granule mixture used for OM. The joint use of several analytical techniques helps clarify fertilizers' characteristics and the chemical processes that influence their efficiency and may be helpful for improving the management and manufacture of organomineral phosphate fertilizers.

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“…The first endothermic effect (minimum 210°C) is mainly connected with the melting of (NH 4 ) 2 HPO 4 and partial elimination of ammonia (Eq. 3) [22,23]. The theoretical mass loss which is associated with the elimination of one molecule of ammonia is 12.9 %.…”

Section: Resultsmentioning

confidence: 99%

DTA-TG and XRD study on the reaction between ZrOCl2·8H2O and (NH4)2HPO4 for synthesis of ZrP2O7

Gorodylova

Šulcová

Bosacka

et al. 2014

J Therm Anal Calorim

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In this paper, we report results of thermoanalytical investigation on the reaction between ZrOCl 2 Á8H 2 O and (NH 4 ) 2 HPO 4 in molar ratio 1:2. Differential thermalthermogravimetric and X-ray diffraction analyses were performed in order to reveal the chemical transformations, which took place during heating of the individual compounds ZrOCl 2 Á8H 2 O, (NH 4 ) 2 HPO 4 and the mixture ZrOCl 2 Á8H 2 O:2(NH 4 ) 2 HPO 4 . It was shown that the transformations in the mixture below 160°C were connected with dehydration of ZrOCl 2 Á8H 2 O and interaction between the components of the mixture, which resulted in the formation of NH 4 Cl, NH 4 H 2 PO 4 and a mainly amorphous zirconium phase, most likely t-ZrO 2 . The zirconium component subsequently reacted with ammonium dihydrophosphate (below 200°C) or with dehydrated phosphate derivatives (above 200°C), which in both cases yielded an amorphous product. The interaction between the components of the mixture resulting in the formation of ZrP 2 O 7 was completed by its crystallisation at 610°C. Our study indicates an alternative low-temperature approach for the synthesis of the technologically important ZrP 2 O 7 material.

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Thermal Stability, Thermal Decomposition of High-Analysis Fertilizers Based on Ammonium Phosphate

Cited by 16 publications

References 3 publications

Study of the thermal decomposition of solids in a fluidized bed, II

Study of the thermal decomposition of solids in a fluidized bed, II

Chemical, Thermal, and Spectroscopic Analysis of Organomineral Fertilizer Residue Recovered from an Oxisol

DTA-TG and XRD study on the reaction between ZrOCl2·8H2O and (NH4)2HPO4 for synthesis of ZrP2O7

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