Possibilities of Graphitization of Unburned Carbon from Coal Fly Ash

Minerals

Joanna Komorek¹  Zdzisław Adamczyk¹  Joanna Całus-Moszko²  Barbara Białecka²  Agnieszka Klupa² 

[1] Department of Applied Geology, Silesian University of Technology, 44-100 Gliwice, Poland;Department of Environmental Monitoring, Central Mining Institute, 40-166 Katowice, Poland;

关键词: unburned carbon;    fly ash;    graphitization;    graphite;    textural parameters;   

DOI  :  10.3390/min11091027

来源: DOAJ

【 摘 要 】

The paper presents the characteristics of products annealing at the temperatures of 2400 and 3000 °C of unburned carbon from coal fly ash in terms of its possible use as a starting material in the graphitization process. An amorphous substance (organic substance) with an admixture of some minerals has been found in samples subjected to graphitization. However, the graphite phase is dominant in products subjected to graphitization. Studies have also shown a diverse grain morphology in individual samples. The presence of plate-shaped and tube-shaped grains was found. As the graphitization temperature of the starting material increases (2400 and 3000 °C), the specific surface area in the graphitization products decreases. The total pore volume in the samples after the graphitization process was significantly lower than the pore volume of active carbons produced from other unburned carbon. Average pore diameter is similar to the pore diameter in active carbons. The reflectance value of the matrix for the sample graphitized at 3000 °C is characteristic for graphite. Unburned carbon from Polish fly ash can be used as the starting material for graphitization.

【 授权许可】

Unknown