含钒铁水增碳与增碳剂的选择

Carburization Experiment of Vanadium-containing Hot Metal and Choicee of Carburant

通过分析含钒铁水增碳的热力学,证明了含钒铁水增碳的可行性。然后在1 500℃的增碳温度下,将5种增碳剂加入到含钒铁液,进行增碳试验。由试验结果可知,5种增碳剂的增碳效果优先顺序为:低氮增碳剂、石墨、无烟煤、碳粒、焦炭,增碳反应的平衡常数K的数量级为10^(-4)s^(-1)。分析认为,增碳效果的不同主要与增碳剂中硫含量和灰分含量的差别有关。综合分析表明无烟煤是含钒铁水增碳的最佳增碳剂,在实际生产中,吨铁加入13.2 kg无烟煤时,增碳量为0.5%。

Firstly, thermodynamic analysis of carbon dissolution had been made. It proved that carburization process was provided with good thermodynamic condition, however, carburization process was restrained by oxidation of carbon. Based on these research results, carburization experiment of laboratory level had been conducted. Five kind of carburant are employed in the experiments at temperature of 1 500 ℃. The rank of carburization efficiency for five carburizers is obtained as follows：low nitrogen carburant, graphite, anthra- cite,carbon granule and coke. It is concluded that the difference of carburization amount is mainly related with contents of both sulfur and ash in the carburizers. Carburization amount decreases with the increase of sulfur content or ash content in the carburizer. The magnitude of rate constant of the carburization reaction is calculated to be 10-4s-1. Anthracite is the most suitable carburizer among the five carbonaceous materi- als. Addition of 13.2 kg anthracite brings 0.5% increase of carbon content in practical production.