Wpływ węglanów litu, strontu i baru na fazę belitu tworzoną przy temperaturze 1200C

Ghorab, Hanaa Youssef; Abbas, Mostafa; Arafa, Ahmed; Hassan, Hassan Eid

doi:10.32047/CWB.2023.28.6.5

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Tytuł artykułu

Wpływ węglanów litu, strontu i baru na fazę belitu tworzoną przy temperaturze 1200C

Autorzy

Ghorab Hanaa Youssef , Abbas Mostafa , Arafa Ahmed , Hassan Hassan Eid

Wybrane pełne teksty z tego czasopisma

http://www.cementwapnobeton.pl/

Identyfikatory

DOI

10.32047/CWB.2023.28.6.5

Warianty tytułu

Effect of lithium, strontium and barium carbonates on the belite phase formed at 1200°C

Języki publikacji

PL EN

Abstrakty

Worcowy belit został przygotowany poprzez wypalenie kalcytu i kwarcu w stosunku molowym 2 przez 1,5 godziny w temperaturze 1200°C. Zidentyfikowano odmiany polimorficzne belitu utworzone przy dodatku Li2CO3 z 1% Li2O jako topnika i domieszki oraz SrCO3 i BaCO3 w ilościach równoważnych 8% SrO i 8% BaO jako mineralizatorów. Utworzone odmiany polimorficzne zbadano za pomocą dyfraktometrii rentgenowskiej z analizą Rietvelda oraz zbadano pod skaningowym mikroskopem elektronowym. Stwierdzono, że odmiany β i γ równie często powstają w belicie z domieszką strontu, a w obecności baru pojawia się również α’. Rozkład Li2CO3 do Li2O jest opóźniony przez węglany strontu i baru z powodu wzrostu ciśnienia parcjalnego CO2 i w konsekwencji stopiony materiał jest stabilizowany. Konieczne są dalsze badania w celu wyjaśnienia wpływu ciśnienia parcjalnego CO2 węglanów na polimorfizm krzemianu dwuwapniowego.

A reference belite is prepared from burning calcite and quartz at mole ratio = 2, for 1.5 hours at 1200°C. Belite polymorphs formed in the presence of Li2CO3 with 1% Li2O, as a fluxing and doping agent, in addition to SrCO3 and BaCO3 with amounts equivalent to 8% SrO and 8% BaO, as mineralizers, were identified. The thermal behavior of the belite mixes and of the pure carbonates was recorded for temperatures up to 1300°C. The polymorphs formed are defined by means of X-ray Rietveld analysis, and examined under a scanning electron microscope. It is found that the β and γ polymorphs are equally formed in the belite doped with strontium, and in the presence of barium, the α’ appears as well. The decomposition of Li2CO3 to Li2O is depressed by strontium and barium carbonates due to the increase in the partial pressure of CO2 and consequently the melt is stabilized. Further research is needed to explain the effect of CO2 partial pressure of the carbonates on the polymorphism of belite.

Słowa kluczowe

belit polimorfizm substancja fluksująca węglan domieszka

belite polymorphism fluxing agent carbonate dopant

Wydawca

Fundacja Cement, Wapno, Beton

Czasopismo

Cement Wapno Beton

Rocznik

2023

Tom

R. 28, nr 6

Strony

428--437

Opis fizyczny

Bibliogr. 37 poz., il., tab.

Twórcy

autor

Ghorab Hanaa Youssef

Hanaa.ghorab@gmail.com

Faculty of Science, Chemistry Department, Helwan University, Cairo, Egypt

autor

Abbas Mostafa

Faculty of Science, Chemistry Department, Helwan University, Cairo, Egypt

autor

Arafa Ahmed

Heidelberg Materials, Egypt

autor

Hassan Hassan Eid

Faculty of Science, Chemistry Department, Helwan University, Cairo, Egypt

Bibliografia

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-40f23b94-06fb-43c1-8e1b-37c2b02055fa