INFLUENCE OF MODIFYING ADDITIVES ON THE PROCESSES OF SYNTHESIS OF CLINKER MINERALS OF HIGH ALUMINA CEMENT-Reference-Cited by-同舟云学术

INFLUENCE OF MODIFYING ADDITIVES ON THE PROCESSES OF SYNTHESIS OF CLINKER MINERALS OF HIGH ALUMINA CEMENT

Published:2022-03-01 Issue:6 Volume:7 Page:94-102
ISSN:2071-7318
Container-title:Bulletin of Belgorod State Technological University named after. V. G. Shukhov
language:en
Short-container-title:

Author:

Volovicheva N.¹,Troubitsin M.¹,Furda L.²,Yapryncev M.¹,Kuzin V.³,Kolomytsev E.⁴

Affiliation:

1. Belgorod National Research University

2. Belgorod State National Research University

3. CJSC «PKF «NK»

4. ZAO «PKF «NK»

Abstract

The article presents the results of studying the effect of modifying additives CaAl2O4 (CA) and CaAl4O7 (CA2), as well as boric acid on the processes of phase formation of clinker minerals. The calculation of the content of raw materials in the charge is carried out taking into account the production of high-alumina clinker with the participation of Al2O3 71–72 wt.% and CaO 27–28 wt.%. In accordance with the state diagram of the CaO–Al2O3 system, the mass amount accumulates in two calcium aluminate phases: CA 64 wt.% and CA2 36 wt.%. Chalk grade M-90 and commercial alumina grade G-0 are used as feedstock. Heat treatment of powder mixtures with different concentrations of modifying additives is carried out in the temperature range of 1250 - 1350°C with isothermal holding for 1 and 2 hours. It has been established that when 0,5 % H3BO3 is introduced into the charge, the design ratio of the CA and CA2 phases appears after heat treatment at 1350 °C for 2 hours. An increase in the content of boric acid to 1,0 % allows to obtain a phase clinker composition close to the design one at 1250 °C and a holding time of 1 hour. It has been shown that the introduction of HAC additives into the mixture affects the quantitative phase composition of products. A correlation is established between the amount of HAC introduced and the decrease in the content of unreacted α-alumina in samples heat-treated at 1350 °C for 1 hour.

Publisher

BSTU named after V.G. Shukhov

Subject

Psychiatry and Mental health,Neuropsychology and Physiological Psychology

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