Analysis of the Anode Paste Charge Composition
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ANALYSIS OF THE ANODE PASTE CHARGE COMPOSITION R. Yu. Feshchenko,1 E. A. Feschenko,2 R. N. Eremin,3 O. O. Erokhina,4 and V. M. Dydin5
UDC 521.3.036.61
Anode pastes are widely used in the production of ferroalloys and primary aluminum and in other processes in the metal and chemical industries. In consideration that their manufacturing involves dosing and mixing, the properties and performance of the commercial product are determined by the type of initial charge components and their ratio. This study analyzed the composition of the initial charge mixtures of two anode pastes. At the initial stage, the solid carbon filler was separated from the pitch binder. The filler separated was classified by the components based on the difference in their physical properties and then divided into size classes. A comprehensive thermal analysis of the initial samples and the filler fractions was performed to evaluate the thermal transformations in the samples and to determine the filler–binder ratio in the charge. The extraction results of individual pitch fractions in the corresponding solvents were considered in the analysis. The charge mixture for two anode paste samples was analyzed to determine the possibility of using this approach. This approach can be developed further for possible applications in metal industry enterprises and in laboratory studies. Keywords: anode pastes, comprehensive thermal analysis, charge components, electrothermics, aluminum electrolysis, heavy medium separation.
Soderberg-type anode pastes are widely used in electrothermic furnaces in the production of ferroalloys and phosphorus, in the production of primary aluminum by the Soderberg method, and in other processes in the metal and chemical industries because of the simple operation of the electrodes due to the roasting of masses directly “in place,” thereby reducing product cost [1–3]. An important advantage of Soderberg-type electrodes in electrothermal furnaces is the simplicity of nippling electrodes during technological processes [4]. Anode pastes have a traditional composition that includes solid carbon-containing filler, such as thermoanthracite, calcined petroleum coke, or even graphite, and a binder (coal tar pitch) [5]. Concerns associated with the use of anode pastes in metallurgy include the following: – variability of electrode properties due to uneven distribution of components over its volume; – cracking caused by segregation with an incorrect binder–filler ratio [6–8]; Saint Petersburg Mining University, Saint Petersburg, Russia. 1 E-mail: [email protected]. 2 3 4 5
E-mail: [email protected]. E-mail: [email protected].
E-mail: [email protected]. E-mail: [email protected].
Translated from Metallurg, Vol. 64, No. 7, pp. 21–26, July, 2020. Original article submitted December 3, 2019. 0026-0894/20/0708-0615
© 2020
Springer Science+Business Media, LLC
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R. YU. FESHCHENKO, E. A. FESCHENKO, R. N. EREMIN, O. O. EROKHINA,
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V. M. DYDIN
– cracking caused by uneven combustion of the electrode due to dif
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