Building Materials and Products
DOI: http://www.dx.doi.org/10.24866/2227-6858/2020-2-14
Leonovich S., Sviridov D., Belanovich A., Karpushenkova L., Karpushenkov S., Kim L.
SERGEY LEONOVICH, Doctor of Engineering Science, Professor, Dean, ORCID: 0000-0002-4026-820X, ResearcherID: D-8864-2018, ScopusID: 44661420200, e-mail: sleonovich@mail.ru
Belarusian National Technical University
Minsk, Belarus
DMITRY SVIRIDOV, Doctor of Chemical Science, Professor, Dean, ScopusID: 7006420486, e-mail sviridov@bsu.by
ANATOLY BELANOVICH, Candidate of Chemical Science, Senior Researcher, e-mail: lab508@mail.ru
LARISA KARPUSHENKAVA, Candidate of Chemical Science, Associate Professor, Department of Physical Chemistry, ORCID: 0000-0002-8875-5568, ResearcherID: AAB-8934-2020, ScopusID: 6504468775, e-mail: karpushenkava@bsu.by
SERGEY KARPUSHENKOV, Candidate of Chemical Science, Associate Professor, Department of Inorganic Chemistry, ORCID: 0000-0003-2768-453X, ResearcherID: AAB-8957-2020, ScopusID: 35771076300, e-mail: karpushenkov@bsu.by
Belarusian State University
Minsk, Belarus
LEV KIM, Candidate of Engineering Science, Associate Professor, Lead Specialist of the School of Engineering, ORCID: 0000-0002-3551-164X, ScopusID: 7202159044, e-mail: kim_lvl@dvfu.ru
Far Eastern Federal University
Vladivostok, Russia
Use of alkaline activation for production
of porous glass-ceramic material from clay mixture
Abstract: The objective of this study was to determine the possibility of using local low-melting clay from the Kustiha deposit and technogenic waste from the production of crushed granite to obtain an environmentally friendly porous heat-insulating material using the alkaline activation method. The alkaline activation's effect on the formation of a porous glass-ceramic material from a mixture of low-melting clay and granite waste was studied. It was shown that the clay mixture from the Kustiha deposit with granitoid’s screenings containing free silicon dioxide is able to swell under the action of alkali at calcination temperature up to 950 degrees Celcius. Using methods of thermogravimetry and IR analysis, it was found that under the action of alkaline activation water is retained in the initial mixture due to the formation of additional hydroxyl bonds up to 500 degrees Celcius. With further firing, such hydroxyl bonds contribute to the transition of the material into the pyroplastic state and its expansion. It was found that the obtained granular glass-ceramic material has high porosity (expansion coefficient is 4.2 plus/minus 0.2), while its density (0.26 plus/minus 0.03 gram/cubic centimeter) is 5.4 times lower than that of the material obtained from an inactive mixture clay with granitoid's screening. According to elemental and phase analysis, the glass ceramic obtained does not contain organic and other toxic impurities, which allows it to be attributed as an environmental friendly heat-insulating material.
Keywords: clay, porous glass ceramics, alkaline activation, granitoid's screening, firing.
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