不同石油焦及其煅烧程度对煅后焦性能的影响

Effects of petroleum coke types and calcining levels on the calcined coke properties

对3种不同组成和来源的石油焦进行热重差热分析（TG-DSC）,并分别在800,900,1 000,1 100℃下进行煅烧,研究不同石油焦种类、煅烧程度对煅后焦性能的影响,为应用低煅焦制备更均质、低电解炭耗的炭阳极提供技术支持。结果表明,800℃下煅烧的煅后焦Lc值为1.7-1.8 nm,真密度为1.879-1.892 g/cm3,可满足炭阳极生产的最低要求;800℃之前石油焦已经基本完成挥发分和有机硫排放;影响煅后焦粉末电阻率和反应性能的最重要因素是原料石油焦的煅烧程度,且这些性能随着煅后焦煅烧程度增加而降低。

In this paper, three types of petroleum coke were analyzed by TG-DSC and calcinated at 800, 900, 1 000 and 1 100 ℃, respectively for studying the effects of coke types and calcining levels on the calcined coke properties. This work provide technical support for producing anode with low-temperature-calcined cokes which have better component homogeneity and smaller carbon consumption in aluminum electrolysis. Results show that the minimum calcining temperature, L~ value and real density of cokes for carbon anode used in aluminum industry are 800 ℃, 1.7--1.8 nm and 1.879--1.892 g/cm3, respectively. The removal of volatile and the free sulfur can be completed at a temperature as low as 800 ℃. The calcining level of coke is the most important factor to coke conductivity and reactivity, and the properties deteriorate with the increase of the coke calcining level.