ArticleName |
Developing a technique to estimate the anode paste impregnation degree |
ArticleAuthorData |
RUSAL ITTs, Krasnoyarsk, Russia:
V. Yu. Buzunov, Director of the Directorate for Aluminium Production and Development S. A. Zykov, Manager of the Anode Department, Directorate for Aluminium Production and Development S. A. Khramenko, Project Leader, Directorate for Aluminium Production and Development, e-mail: sergey.khramenko@rusal.com |
Abstract |
Anode paste is a coke-pitch composition. The pitch-coke interaction in mixer determine properties anode paste. The main tasks of mixing are the uniform distribution components of the coke-pitch composition and effective impregnation pitch in coke’s open pores. The degree of pitch impregnation in coke’s pores depends on the properties of coke, pitch and mixing conditions. Interaction between coke and pitch was investigated by the drop spreading method, image analysis and mercury porosimetry. These methods require special instruments and no widely use in industrial conditions. In this article, method for estimating the degree of impregnation of coke by coal tar pitch is discussed. The method uses standard devices for determining the volumetric characteristics of coke and anode paste. Coke’s porosity and the anode mass porosity estimate as ratio vibro-volume density and apparent density of the fraction –2.36+1.18 mm. The degree pitch’s impregnation estimate as ratio the porosity coke and the porosity anode mass. Industrial tests of the method showed its effectiveness and allowed to reveal some features of the industrial process of mixing. |
References |
1. Hulse K. L. Anode Manufacture Raw Materials Formulation and Processing Parameters. Switzerland : R&D Carbon Ltd. 2000. ISBN 3-9521028-5-7. 2. Proulx A. L. Optimum binder content for prebaked anodes. Light Metals. 1993. pp. 657–661. 3. Rocha V. G., Blanco C., Santamaría R., Diestre E. I., Menéndez R., Granda M. Pitch/Coke Wetting Behavior. Fuel. 2005. Vol. 84. pp. 1550–1556. 4. Sarkar A., Kocaefe D., Kocaefe Y., Sarkar D., Bhattacharyay D., Morais B., Chabot J. Coke-Pitch Interactions during Anode Preparation. Fuel. 2014. Vol. 117. pp. 598–607. 5. Ying Lu, Duygu Kocaefe, Yasar Kocaefe, Dipankar Bhattacharyay, Xian-Ai Huang, Brigitte Morais. Study of the wetting coke by different pitches. Light Metals. 2016. pp. 871–876. 6. Tong Chen, Jilai Xue, Xiang Li, Guanghui Lang, Guojing Zhou, Lin Tang. Effects of mixing parameters and pores of cokes on pitch adsorption in making carbon anode pastes. Light Metals. 2015. pp. 1049–1054. 7. Fischer W. K., Perruchoud R. C. Wetting behavior of pitch and coke using a simple agglomeration test. Anode for the Aluminium Industry. Switzerland : R&D Carbon Ltd, 1995. pp. 169–181. 8. ASTM D4404 – 10. Standard Test Method for Determination of Pore Volume and Pore Volume Distribution of Soil and Rock by Mercury Intrusion Porosimetry. ASTM International, West Conshohocken, PA, 2010. Available at: www.astm.org 9. ISO 10236–95. Carbonaceous materials for the production of aluminium — Green coke and calcined coke for electrodes — Determination of bulk density (tapped). Published: 1995.11. 10. GOST R ISO 21687–2014. Carbonaceous materials for the production of aluminium — Determination of density by gas pyknometry (volumetric) using helium as the analysis gas — Solid materials. Introduced: 2015.07.01. 11. Lossius L., Spencer B., Øye H. A. Bulk Density — Overview of ASTM and ISO Methods with Examples of between Laboratory Comparisons. Light Metals. 2011. pp. 941–946. 12. Panchal J., Wyborney M., Rolle J. Historical and Future Challenges with the Vibrated Bulk Density Test Methods for Determining Porosity. Light Metals. 2011. pp. 925–930. |