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CARBONLETT, vol. 28, no. 1, pp.24-30, 2018

DOI: http://dx.doi.org/ DOI:10.5714/CL.2018.28.024

Influence of kneading ratio on the binding interaction of coke aggregates on manufacturing a carbon block

Jong Gu Kim1,2, Ji Hong Kim1,4, Byong Chol Bai1, Yun Jeong Choi1, Ji Sun Im1,6,♠, Tae-Sung Bae3, and Young-Seak Lee2,♠

Affiliation: 1Carbon Industry Frontier Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Korea
2Institute of Carbon Fusion Technology, Chungnam National University, Daejeon 34134, Korea
3Jeonju Center, Korea Basic Science Institute, Jeonju 54907, Korea 4Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea
5Korea Institute of Convergence Textile, 594, Iksan-si, Jeollabuk-do, Korea
6University of Science and Technology (UST), Daejeon 34113, Korea

Abstract: Coke aggregates and carbon artifacts were produced to investigate the interactions of coke and pitch during the kneading process. In addition, the kneading ratio of the coke and binder pitch for the coke aggregates was controlled to identify the formation of voids and pores during carbonization at 900°C. Experiments and thermogravimetric analysis revealed that carbon yields were improved over the theoretical yield calculated by the weight loss of the coke and binder pitch; the improvement was due to the binding interactions between the coke particles and binder pitch by the kneading process. The true, apparent, and bulk densities fluctuated according to the kneading ratio. This study confirmed that an excessive or insufficient kneading ratio decreases the density with degradation of the packing characteristics. The porosity analysis indicated that formation of voids and pores by the binder pitch increased the porosity after carbonization. Image analysis confirmed that the kneading ratio affected the formation of the coke domains and the voids and pores, which revealed the relations among the carbon yields, density, and porosity.

Keyword: kneading process, coke aggregates, carbon artifacts, binder pitch, carbonization