MAIN CHARACTERISTICS OF FLY ASH FROM EKIBASTUZ SRPP–2
Nurpeissova V.B. Yestemesov Z.A. Век A.A. Kim V.S. Syndarbekova G.K.
2023National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2023#2023Issue 2168 - 176 pp.
Purpose of this work is to study physicochemical characteristics of fly ash from the Ekibastuz SRPP-2, which is the most powerful thermal power plant in Kazakhstan, in terms of its formation and accumulation. This will make it possible to use it more rationally and efficiently during obtaining CEM II/A-3, CEM II/B-3, CEM V/A and CEM V/B. Methodology. XRF and XPSA were used to identify chemical and phase compositions, and standard methods were used to determine physical properties. Results. Studied fly ash is a low-active material, in order to increase its effectiveness as an additive for Portland cements, it is recommended to activate it. Fly ash from Ekibastuz SRPP – 2 has following physical and chemical characteristics: specific surface – 290 m2/kg, true density – 21 g/cm3, bulk density – ~780 kg/m3, specific effective activity of radionuclides – 72 Bq/kg. Chemical composition is represented mainly by SiO2 (56.7 %) and Al2O3(28.6 %), phase composition – mullite (38 %), quartz (32 %), sillimanite (12 %), hematite (5 %), glass phase (10 %) and unburned carbon (3 %); basicity modulus is 0,02 and the activity modulus is 0,5. It follows from the above that this fly ash is super acidic, among its components only the glass phase (10 %) can have increased activity, another part of silica (26 %) is reactive. Results of particle size distribution showed that: – unburned carbon is mainly concentrated in the composition of large fractions, and glass phase is mainly among the smallest particles; – particles of mullite, sillimanite and quartz are approximately equally distributed in fractions Urgency and significance of this problem is intensified with the fact that technogenic wastes of CHPP are not sufficiently processed, current ash wastes accumulate and occupy vast areas, which takes them out of land use. Utilization of ash dumps makes it possible to reduce technogenic load on the environment and ensure rational use of secondary raw materials. Scientific novelty. For the first time, reasons for low activity of fly ash from the Ekibastuz CRPP-2 are shown; in order to increase efficiency, as an additive, it must be ground together with cement. Before grinding cement with the addition of fly ash, it is carried out on disintegrator mill. Practical value. Waste-free technology for processing of technogenic materials is being created, and activity of cements will increase.
fly ash; chemical and phase compositions , glass phase , mullite , particles and fractions , physical and chemical properties , quartz , sillimanite , unburned carbon
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Kazakh National Research Technical University named after K.I. Satpayev, Almaty, Kazakhstan
Central laboratory for certification testing of building materials – TseLSIM LLP, Almaty, Kazakhstan
Plant № 1 for production of reinforced concrete products – Zhenis LLP, Almaty, Kazakhstan
Kazakh National Research Technical University named after K.I. Satpayev
Central laboratory for certification testing of building materials – TseLSIM LLP
Plant № 1 for production of reinforced concrete products – Zhenis LLP
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