INFLUENCE OF HEAT TREATMENT MODES ON THE PROCESS OF SYNTHESIS OF CALCIUM-ALUMINATE PHASES IN THE TECHNOLOGY OF SPECIAL HIGH PURITY ALUMINUM CEMENT-Reference-Cited by-同舟云学术

INFLUENCE OF HEAT TREATMENT MODES ON THE PROCESS OF SYNTHESIS OF CALCIUM-ALUMINATE PHASES IN THE TECHNOLOGY OF SPECIAL HIGH PURITY ALUMINUM CEMENT

Published:2022-02-14 Issue:2 Volume:7 Page:84-93
ISSN:2071-7318
Container-title:Bulletin of Belgorod State Technological University named after. V. G. Shukhov
language:en
Short-container-title:

Author:

Troubitsin M.¹,Yapryncev M.¹,Furda L.²,Volovicheva N.¹,Kuzin V.³,Zubaschenko R.³

Affiliation:

1. Belgorod National Research University

2. Belgorod State National Research University

3. CJSC «PKF «NK»

Abstract

The results of experimental studies on the phase formation of CaAl2O4 (CA) and CaAl4O7 (CA2) from CaCO3-Al2O3 powder mixtures in the temperature range 1250 - 1450 ° C ate presented. In order to calculate the content of raw materials in the charge, the criterion of obtaining high-alumina clinker with Al2O3 content of 71 - 72 wt. % and CaO 27 - 28 wt.% is proceeded. This mass ratio in the CaO - Al2O3 system state diagram suggests the presence of two calcium-aluminate phases CA and CA2. The projected phase composition of clinker is 64 mol. % CaAl2O4 (CA) and 36 mol. % CaAl4O7 (CA2). As precursors chalk grade M-90 and technical alumina grade G-0 are used. The initial charge is heat-treated at temperatures of 1250, 1300, 1350, 1450°C and isothermal stage times of 1 and 2 hours. It is supposed that the synthesis of target phases CA and CA2 is preceded by formation stage followed by degradation of calcium-enriched metastable phase C12A7. This assumption is confirmed by the results of thermogravimetric and X-ray phase analyses and by scanning electron microscopy. The process of formation of CA and CA2 target products from dispersed powders of aluminum oxide and calcium carbonate with increasing temperature and time of isothermal exposure is determined mainly by diffusion of more mobile Ca2+ cations released in the process of C12A7 phase degradation in the area of high concentrations of aluminum oxide.

Publisher

BSTU named after V.G. Shukhov

Subject

Psychiatry and Mental health,Neuropsychology and Physiological Psychology

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