engleski

Demetalization of Metallurgical Coke by High Temperature treatment up to 2000 C

One of the most important indicators for metallurgical coke quality and application is presence and content of metallic and non-metallic constituents. This paper reports the results of an investigation of the concentration of Si and Ca and types of their chemical compounds present in industrial manufactured metallurgical coke. The coke samples were subjected 2 and 4 hours to high - temperature treatment at 1200, 1600 and 2000 C; heating rate was 10 C/min. The results of investigation showed that during the heat treatment of coke samples same metallic microconstituents partially separated and also transformed their compounds. Before heat treatment silicon were present in the form of oxides (SiO2 alpha quartz) and silicates (3Al2O3x2SiO2 and 3CaOx2SiO2) while calcium was present as CaO and CaSO4. At 1200 C was identified a new type of silicon - SiO2 - alpha crystoballite; calcium was in form 2CaOxFe2O3, CaOxAl2O3 and others. The very stable SiC was identified after temperature treatment at 1600 and 2000 C. To know the chemical types of metallic compounds in coke is very important for selection of treatment of their separation. The high temperature treatment is one of the methods of successful coke demetalization.

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