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newtime007

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专业: 病原细菌与放线菌生物学

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fg2009(金币+30, 博学EPI+1): 谢谢 2011-04-22 16:41:03

Study on preparation of Needle Coke from coal tar
needle coke was considered the most important industrial raw material for making UHP electrodes. Through the solvent - centrifugation purification asphalt, then preparate needle coke appling delayed coking process.This study investigated the effection of the polymerization QI content, temperature, pressure and time,which influences quality of coal car.It was found that reducing content of QI in feedstock is favorable to needle structure formation, content of QI less than 0.5% can form large needle structure; The appropriate temperature and pressure can reduce system with viscosity and promote airflow pull, the quality of needle coke is best in condition 450 ℃,0.7 MPa; system can melt and rearrange form good needle structure at 20h reaction.