Thermochemistry and kinetics of the aspect of diammonium hydrogen phosphate precipitation in phosphoric acid solution

Brahim, Khemaies; Rouissi, Khalil; Soussi-Baatout, Amira; Khattech, Ismail

doi:10.1007/s10973-020-09399-z

Cited by 3 publications

(3 citation statements)

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“…3 DSC and TG curves for all glass batches studied hydrogen phosphate ((NH 4 ) 2 HPO 4 ). At a temperature of approximately 200 °C, there was a decrease in mass due to evolution of ammonia NH 3 [19]. It is not easy to distinguish the signals for the decomposition products of ammonium hydrogen phosphate because of the overlap of these reactions.…”

Section: Dsc-tg-ega (Ms) Resultsmentioning

confidence: 99%

“…At low temperatures [19], ammonia was released according to the following reactions: this led to the formation of phosphoric acid. The acid was dehydrated as in the reaction below, producing pyrophosphoric acid [19] This reaction proceeded at a very slow rate with formation of P 4 O 10 . Immediately [19] after formation, P 4 O 10 sublimed at 579 °C.…”

Section: Discussionmentioning

confidence: 99%

“…The acid was dehydrated as in the reaction below, producing pyrophosphoric acid [19] This reaction proceeded at a very slow rate with formation of P 4 O 10 . Immediately [19] after formation, P 4 O 10 sublimed at 579 °C.…”

Section: Discussionmentioning

confidence: 99%

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Melting behavior of sulfur-bearing silicate–phosphate glass batches

Sułowska

Szumera

Madej

et al. 2022

J Therm Anal Calorim

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The main purpose of the research was to explain the differences between nominal and actual chemical compositions of silicate-phosphate glasses in the SiO2-P2O5-K2O-MgO-SO3 system. The actual compositions of the materials were determined with X-ray fluorescence (XRF) analyses. Changes in the chemical composition were explained by examining the melting processes for selected glass batches with differential scanning calorimetry-thermogravimetry-related gas analysis by mass spectrometry (DSC-TG-EGA (MS)) and high-temperature X-ray diffraction (HT-XRD). It was found that changes in the chemical composition of the sulfur-bearing glasses were associated with the release of gaseous products. The main gases released during thermal decomposition of the selected glass batch were water vapor, carbon dioxide, carbon monoxide, and ammonia. Since these glasses have potential for use as glassy fertilizers, there is no doubt that the present study is important from an environmental point of view.

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Section: Dsc-tg-ega (Ms) Resultsmentioning

confidence: 99%