Studies of the sintering method of ash and slag waste for the production of alumina from self-disintegrating sinters

Bakirov A. Zhunusov A. Oleinikova N. Ramazanova R.
15 November 2024 Elsevier Ltd

Heliyon
2024 #10 Issue 21

The goal of this research is to select the optimal composition of the sintering charge of ash and slag waste for maximum extraction of alumina and obtaining self-disintegrating sinters of a given chemical composition. Experiments have shown that sintering of ash and slag waste using two-component charges makes it possible to extract alumina from sinters by no more than 60 %. The highest sintering rates were made using three-component charges. So, when sintering ash and slag waste from Almaty TPP-2 on a three-component charge of the composition CaO:SiO₂ = 2; Na₂O:(Al₂O₃+Fe₂O₃) = 1 at a duration of 60 min and a temperature of 1200 °C, alumina extraction was 83.68 %, under the same conditions, alumina extraction of 87.07 % was obtained during sintering of ash and slag waste from the Eurasian Energy Corporation, and alumina extraction was 90.2 % during sintering of ash and slag waste obtained after preliminary chemical activation. As a result of the conducted research on sintering of ash and slag waste in a three–component charge system, a self-disintegrating sinter of the following chemical composition was obtained, %: Na₂O – 0.07; CaO – 26.88; SiO₂ – 2.06; Fe₂O₃ – 5.01; Al₂O₃– 5.059.

Activation , Alloy , Alumina , Ash and slag waste , Bicalcium silicate , Limestone , Self-scattering sinters , Sintering , Soda , Sodium aluminate

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Postdoctoral Fellow at the School of Metallurgy and Processing, NJSC D. Serikbaev East Kazakhstan Technical University, Serikbayev 19, Ust-Kamenogorsk, 070000, Kazakhstan
Candidate of Technical Sciences, Associate Professor of the Department of Metallurgy of NJSC Toraighyrov University, Lomov 64, Pavlodar, 140008, Kazakhstan
Doctor of Technical Sciences, Professor of the Department of Metallurgy of Non-ferrous Metals, Siberian Federal University, Krasnoyarsk worker 95, Krasnoyarsk, 660025, Russian Federation

Postdoctoral Fellow at the School of Metallurgy and Processing
Candidate of Technical Sciences
Doctor of Technical Sciences

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