Mining of Mineral Deposits

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Studying the properties of ash and slag waste for use in the manufacture of construction products

Marzhan Nurpeisova1, Zatkali Estemesov2, Syrym Gabbasov3, Ainash Ashimova1, Aiman Bek1

1Satbayev University, Almaty, Kazakhstan

2Central Laboratory for Certification of Building Materials, Almaty, Kazakhstan

3Kazakh Agrarian Research Technical University, Astana, Kazakhstan


Min. miner. depos. 2023, 17(3):102-109


https://doi.org/10.33271/mining17.03.102

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      ABSTRACT

      Purpose. The research purpose is to study the physical-chemical properties of ash and slag waste generated during the coal combustion at the Ekibastuz field in Kazakhstan, to determine the possibility of using waste as a secondary resource to reduce the negative human impact on the environment.

      Methods. The research uses the methods of X-ray phase and differential thermal analysis, as well as chemical analysis. The X-ray phase analysis makes it possible to determine the phase composition and structure of ash and slag wastes, while differential thermal analysis is used to study their behavior with temperature changes. A chemical analysis is performed to determine the composition of ash and slag.

      Findings. The chemical and granulometric composition of ash and slag waste from the Ekibastuz field coal combustion has been determined. Analysis of the ash chemical composition showed that its main components are silicon and aluminum oxides, as well as a significant amount of iron oxide. The results obtained confirm the possibility of using ash and slag waste as a secondary raw material to reduce the negative impact on the environment.

      Originality. It has been revealed that the thermal conductivity, ultimate strength and water-absorption of ceramic brick samples depend on the amount of ash added and the firing temperature. The possibility of obtaining building materials with minimum cement content has also been substantiated, which is a new and promising approach, given the high cost of cement as the main building material.

      Practical implications. The practical value of the research is in solving environmental problems associated with the use of ash and slag waste. Using these wastes as a secondary raw material, it is possible to reduce the anthropogenic burden on the environment, as well as the volume of ash dumps. In addition, vacant land previously occupied by ash and slag mixtures can be used for economic purposes.

      Keywords: coal combustion, ash and slag dumps, physical-chemical properties, secondary raw materials, building materials


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