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Influence of Adding Modified Coal Tar Pitch on the Mixed Coals Cokeability in the Coking Process |
ZHANG Bingsheng,LIANG Qiang,GUO Hanjie,WANG Fuming |
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract The cokeability of adding modified coal tar pitch to four kinds of mixed coals, such as the ash content Ad, the volatiles Vdaf, the sulfur content St,d, the shrinkage index X, and the coal caking index G was studied. The results show that the ash content of the four kinds of mixed coals decrease slowly, and then increase, when modified coal tar pitch content is less than 6%. The volatiles of the four kinds of mixed coals increase with modified coal tar pitch content, and reach to the highest level when modified coal tar pitch content is 5%. The sulfur content differ from different kinds of coals. The 4th match doesn’t change when modified coal tar pitch content increases. The other three kinds of mixed coals don’t have a rapidly increase until modified coal tar pitch content is 5%. The plastometer thickness Y of the mixed coals will increase with higher content of modified coal tar pitch. The shrinkage index X will reduce with higher content of modified coal tar pitch. The coal caking index G of the 3rd match won’t change when modified coal tar pitch content increase, but the other three kinds of mixed coals reach to the highest level with modified coal tar pitch content reach to 5%6%.
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Received: 01 January 1900
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