Prospects of the Irkutsk Region hydro-removal ash usage as the main raw material for construction ceramics production

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Abstract

The article presents results of research on assessing the possibility of construction ceramics with hydro-removal ash (HRA) as the main raw material production. The main objects of the research were the HRA from TPP-10 and TPP-9, chosen because of the total ash accumulation volume, amounting to 48 thousand tons and proximity of the ash dumps to the existing ceramic Irkutsk brick production. The article presents physicochemical characteristics of the studied HRA, as well as structural and physicomechanical characteristics of the ceramic crock obtained from the HRA. Following methods were used: X-ray diffraction analysis, X-ray fluorescence analysis, TGA-thermogravimetric analysis, petrographic analysis, SEM-scanning electron microscopy, laser diffraction. During the research, including regression analysis method, the optimal conditions for construction ceramics from HRA obtaining were determined as well as the HTA optimal specific surface and the ceramic crock calcination mode and duration. The 100% HRA ceramic crock strength depends on the calcination mode and the HRAs specific surface area and may vary from 12 to 75 MPa. The main quality indicators for construction ceramics comply with GOST 530–2019 “Ceramic brick and stone. General specifications”. The obtained quality indicators values allow concluding that it is fundamentally possible to use the studied hydro-removal ashes as separate raw material for the construction ceramics production with semi-dry pressing method.

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About the authors

S. V. Makarenko

Irkutsk National Research Technical University

Author for correspondence.
Email: makarenko_83_07@mail.ru

Candidate of Sciences (Engineering), Docent

Russian Federation, 83, Lermontov St., Irkutsk, 664074

A. B. Gonzhitov

Irkutsk National Research Technical University

Email: gonzhitow1999@yandex.ru

Graduate Student

Russian Federation, 83, Lermontov St., Irkutsk, 664074

V. G. Khozin

Kazan State University of Architecture and Engineering

Email: khozin.vadim@yandex.ru

Doctor of Sciences (Engineering), Professor

Russian Federation, 1, Zelenaya Str., Kazan, 420043

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Supplementary files

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2. Fig. 1. TGA Data of the HRA from TRR-10 TG (black); DSC (blue); Ion current (red)

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3. Fig. 2. Particle size variation of HRAs from TPP-10 as a function of its specific surface area: a – S=2000 cm2/g; b – S=4000 cm2/g; c – S=6000 cm2/g

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4. Fig. 3. Response surface TPP-10

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5. Fig. 4. Response surface TPP-9

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6. Fig. 5. Variation of linear and volumetric fire shrinkage and ceramic crock water absorption as a function of maximum firing temperature: 1 – water absorption; 2 – linear shrinkage; 3 – volume shrinkage

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7. Fig. 6. Ceramic samples obtained from HRA of TPP-10 at the firing temperature: a – T=1050оC; b – T=1150оC; c – T=1180оC

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8. Fig. 7. Variation of ceramic crock strength obtained from HRAs of TPP-10 as a function of maximum firing temperature at different specific surface area: 1 – S=2000; 2 – S=4000; 3 – S=6000

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9. Fig. 8. Variation of water absorption and ceramic crock strength in dependance on density at S=6000 cm2/g

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10. Fig. 9. Variation of water absorption and ceramic crock density in dependance on the maximum firing temperature at S=6000 cm2/g

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11. Fig. 10. Images of the ceramic crock structure taken with a polarizing microscope (S=6000 cm2/g): a – with one polarizer; b – with crossed polarizers

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12. Fig. 11. Structure images and SEM spectral analysis results of the ceramic crock obtained at a maximum firing temperature of 1150оC (S=6000 cm2/g)

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