Regularities of oxidized graphite swelling in a reactor in a gravity-falling layer
DOI:
https://doi.org/10.31498/2225-6733.40.2020.216033Keywords:
intercalated graphite compounds, thermografenite, expansion, bulk density, isothermal areaAbstract
The final stage of obtaining thermografenite is thermal shock heating of intercalated graphite, which is carried out in a dense moving fluidized layers, in the ascending flow, in the burner flame in the temperature range from 800°С to 1200°С. A fundamentally new approach is the treatment of intercalated graphite in a gravity-falling layer. It makes it possible to carry out the process in a split second. The proposed processing method is based on the principle of independent movement of similar particles. The present paper describes the basic regularities of intercalated graphite thermal expansion in the gravity-falling layer in the furnace temperature field. It has been shown that in the conditions of a gravity-falling layer the intercalated graphite particles almost instantly acquire the temperature of the environment. The research has found out the dependencies of the thermografenite bulk density on the isothermal zone temperature of the furnace have been found in this research. A new technique to study the swelling of oxidized graphite in the gravity-falling layer in the temperature field of the furnace has been proposed. The principle of independent movement of single particles of oxidized graphite has been formulated. It makes it possible to get high heat transfer coefficients (from 1920 to 5760 W/m2∙K) during heating. The main characteristics of the apparatus for producing thermally expanded graphite in the temperature range from 300°C to 1000°C have been proposed and analyzed. Investigation results of the dynamics of the transformation of the intercalated graphite into thermally expanded graphite under different isothermal temperature in a nitrogen atmosphere and the velocity of particles ranging from 0,9 to 0,35 m/s are presented. The obtained results are analyzed in the system of coordinates «bulk density of thermografenite – temperature of the furnace isothermal area». It has been found that the greatest rate of the intercalated graphite expansion is observed in the temperature range from 350 to 600°C anddeeper volumes additional expansion occurs at a higher temperature. Thermografenite with a bulk density from 3 to 5 kg/mhas been obtained in the temperature range from 800 to 1000°CReferences
Перелік використаних джерел (ДСТУ):
Уббеладе А.Р. Графит и его кристаллические соединения / А.Р. Уббеладе, Ф.А. Льюис. – М. : Мир, 1965. – 256 с.
Физико-химические свойства графита и его соединений / И.Г. Черныш [и др.]. – К. : Наукова думка, 1990. – 200 с.
Eur, Pät. Appl. 87489, Cl, C04B 35/54. Expanded graphite particles / A. Hirschvogel, H. Zimmermann. – Publ. 07.09.83.
Махорин К.Е. Вспучивание природного графита, обработанного серной кислотой / К.Е. Махорин, А.П. Кожан, В.В. Веселов // Химическая технология. – 1985. – № 2. – С. 3-6.
Вспучивание графита в плотном и взвешенном слоях / К.Е. Махорин, А.П. Кожан, В.В. Веселов, В.Н. Александров // Химическая технология. – 1987. – № 2. – С. 43-49.
А. с. 1579008 СССР, МКИ С 01 В 31/04. Способ получения расширенного графита / В.А. Маслов, В.И. Паук, Ю.П. Пустовалов и др. – № 4392502; приоритет изобретения 15.03.1988 (ДСП).
References:
Ubbelade A.R., L’iuis F.A. Grafit i ego kristallicheskie soedineniya [Graphite and its crystal-line compounds]. Moscow, Mir Publ., 1965. 256 p. (Rus.)
Chernysh I.G., Karpov I.I., Prikhod’ko G.P., Shai V.M. Fiziko-himicheskie svojstva grafita i ego soedinenij [Physical and chemical properties of graphite and its compounds]. Kiev, Naukova dumka Publ., 1990. 200 p. (Rus.)
Hirschvogel A., Zimmermann H. Expanded graphite particles. Patent Eur, no. 87489, 1983.
Mahorin K.E., Kozhan A.P., Veselov V.V. Vspuchivanie prirodnogo grafita, obrabotannogo sernoj kislotoj [Extrusion of natural graphite treated with sulfuric acid]. Himicheskaja tehnologija – Chemical Technology, 1985, no. 2, pp. 3-6. (Rus.)
Mahorin K.E., Kozhan A.P., Veselov V.V., Aleksandrov V.N. Vspuchivanie grafita v plotnom i vzveshennom slojah [Graphite swelling in dense and suspended layers]. Himicheskaja tehnologija – Chemical Technology, 1987, no. 2, pp. 43-49. (Rus.)
Maslov V.A., V.I. Pauk, Pustovalov Yu.P. Sposob polucheniya rasshirennogo grafita [The method of obtaining thermally expanded graphite]. Patent USSR, no. 1579008, 1988. (Rus.)
Downloads
How to Cite
Issue
Section
License
The journal «Reporter of the Priazovskyi State Technical University. Section: Technical sciences» is published under the CC BY license (Attribution License).
This license allows for the distribution, editing, modification, and use of the work as a basis for derivative works, even for commercial purposes, provided that proper attribution is given. It is the most flexible of all available licenses and is recommended for maximum dissemination and use of non-restricted materials.
Authors who publish in this journal agree to the following terms:
1. Authors retain the copyright of their work and grant the journal the right of first publication under the terms of the Creative Commons Attribution License (CC BY). This license allows others to freely distribute the published work, provided that proper attribution is given to the original authors and the first publication of the work in this journal is acknowledged.
2. Authors are allowed to enter into separate, additional agreements for non-exclusive distribution of the work in the same form as published in this journal (e.g., depositing it in an institutional repository or including it in a monograph), provided that a reference to the first publication in this journal is maintained.
