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Thermal analysis of the interaction of phosphorite with condensed phosphates of calcium

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Abstract

The thermal reactions between Maardu (Estonia) phosphorite and acidic phosphates were investigated. TG, DTG and DTA of mixtures with H3PO4, Ca(H2PO4)2 · H2O, Ca2P2O7 and [Ca(PO3)2]n in different molar ratios showed a maximum mass loss when the CaO ∶ P2O5 value was 2. The main temperature ranges of the mass losses were determined. The probable reactions relating to the mass losses are given on the basis of the thermal curves and IR spectra.

Résumé

Etude de l'effet thermique lié à la réaction entre la phosphorite de Maardu (Estonie) et les hydrogénophosphates. Etude par TG, TGD et ATD de mélanges de H3PO4 avec Ca(H2PO4)2 · 2 H2O, Ca2P2O7 et [Ca(PO3)2]n réalisés avec différents rapports molaires; mise en évidence d'une perte de masse maximale pour le rapport CaO ∶ P2O5 égal à deux. Détermination des principaux domaines de température où s'effectuent les pertes de masse. On donne les réactions probables correspondant aux pertes de masse en s'appuyant sur les courbes d'analyse thermique et spectres infrarouges.

Zusammenfassung

Die thermische Reaktion zwischen Phosphorit aus Maardu (Estnien) und sauren Phosphaten wurde untersucht. TG, DTG und DTA von Gemischen mit H3PO4, Ca(H2PO4)2 · H2O, Ca2P2O7 und [Ca(PO3)2]n in verschiedenen molaren VerhÄltnissen zeigten den grö\ten Massenverlust bei dem VerhÄltnis von CaO ∶ P2O5=2. Die wichtigsten Temperaturbereiche der Massenverluste wurden bestimmt. Die den Massenverlusten zugeordneten wahrscheinlichen Reaktionen werden aus den erhaltenen thermischen Kurven und IR Spektren ermittelt.

РЕжУМЕ

ИсслЕДОВАНА тЕРМИЧЕ скАь РЕАкцИь МЕжДУ МААРДУскИМ ФОсФОРИт ОМ (ЁстОНИь) И кИслыМИ ФОсФАтАМИ. TG, DTG И DTA сМЕсЕИ с H3PO4, Cc(H2PO4)2. H2O, Ca2P2O7И [Ca(PO3)2] n В РАжлИЧНых МОльРНых сООтНОшЕНИьх пОкАжА лИ МАксИМУМ пОтЕРИ ВЕсА, кОгДА сОО тНОшЕНИЕ CaO∶P2O5 БылО РАВНО 2. ОпРЕДЕ лЕНы глАВНыЕ тЕМпЕРАтУРНыЕ ОБлАс тИ пОтЕРИ ВЕсА. НА ОсНОВАНИИ тЕРМИЧЕск Их кРИВых пРИВЕДЕНы В ОжМОжНыЕ РЕАкцИИ, кОтОРыЕ кОРР ЕлИРУУтсь с пОтЕРЕИ ВЕсА.

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Authors and Affiliations

  1. Polytechnic Institute, Tallin, ESSR

    M. Pyldme, é. Buzágh-Gere, J. Pyldme & M. Veiderma

  2. Institute for General and Analytical Chemistry, Technical University, Budapest, Hungary

    M. Pyldme

Authors
  1. M. Pyldme
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  2. é. Buzágh-Gere
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  3. J. Pyldme
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  4. M. Veiderma
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Pyldme, M., Buzágh-Gere, é., Pyldme, J. et al. Thermal analysis of the interaction of phosphorite with condensed phosphates of calcium. Journal of Thermal Analysis 10, 195–204 (1976). https://doi.org/10.1007/BF01909681

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  • DOI: https://doi.org/10.1007/BF01909681

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