Study of technological properties of coal waste tiles for organizing the production of wall ceramics based on them

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Abstract

Existing methods of recycling coal industry waste do not ensure their effective use in the production of building materials, which leads to the accumulation of waste dumps and deterioration of the environmental situation. The paper studies the main physical and chemical properties of coal mining waste and assesses their impact on the quality of ceramic materials. It has been established that the introduction of finely dispersed fractions of coal mining waste contributes to a change in the structure of ceramics, but requires optimization of heat treatment parameters to compensate for the decrease in density and strength. The relationship between the fineness of coal waste grinding, firing temperature and mechanical characteristics of samples has been experimentally determined. A semi-dry pressing technology has been developed that minimizes the negative impact of waste on strength properties and ensures the stability of the properties of ceramic blocks. The proposed method is aimed not only at reducing production costs, but also at increasing the operational reliability of products due to the optimal combination of raw materials and heat treatment modes. The implementation of this technology based on waste from coal waste heaps in the Eastern Donbass can ensure economic efficiency while improving the technical characteristics of building materials.

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About the authors

Kh. S. Yavruyan

Don State Technical University

Author for correspondence.
Email: khungianos@mail.ru

Candidate of Sciences (Engineering)

Russian Federation, 1, Gagarina Square, Rostov-on-Don, 344003

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2. Fig. 1. External appearance of unburned (а) and burned (b) primary undeveloped waste heaps

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3. Fig. 2. Dependence of the compressive strength of samples on the degree of grinding of the MPT and the firing temperature. Fractional composition of MPT, mm: 1 – 1.25; 2 – 0.63; 3 – 0.315; 4 – 0.16

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4. Fig. 3. Dependence of the average density of samples on the degree of grinding of the MPT and the firing temperature. Fractional composition of screenings, mm: 1 – 1.25; 2 – 0.63; 3 – 0.315; 4 – 0.16

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5. Fig. 4. Dependence of water absorption of samples based on screenings on the degree of grinding and firing temperature. Fractional composition of screenings, mm: 1 – 1.25; 2 – 0.63; 3 – 0.315; 4 – 0.16

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6. Fig. 5. Dependence of the ultimate strength of samples on the content of MPTM fraction 0–0.315 mm and firing temperature, оС: 1 – 950; 2 – 1000; 3 – 1050; 4 – 1100

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7. Fig. 6. Technological scheme for the production of highly efficient ceramic blocks based on coal waste processing products

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