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对高硫石油焦采用化学预氧化再经高温煅烧(1 300℃)进行脱硫处理,并采用XRD和SEM对脱硫前后石油焦样品的结构和表面微观形貌进行分析表征。实验结果表明:常压室温下多种化学氧化剂脱硫效果比较,A酸-过氧化氢混合溶液对石油焦脱硫效果最好,其脱硫率达到20.72%;经A酸-过氧化氢混合溶液化学预氧化再高温煅烧(1 300℃)脱硫处理的石油焦的脱硫率相对直接煅烧或者只进行氧化脱硫处理的样品有显著提高,脱硫率可达55%;A酸-过氧化氢混合溶液化学预氧化处理不会破坏煅烧后石油焦存在的石墨雏晶结构,并且促使石油焦表面形成细微裂纹,这有利于煅烧时焦内部硫的逸出以及生产过程中煅烧石油焦原料与煤沥青的结合。
The high-sulfur petroleum coke was chemically pre-oxidized and then calcined at high temperature (1 300 ℃) for desulfurization. The structure and surface micro-morphology of petroleum coke samples before and after desulfurization were characterized by XRD and SEM. The experimental results show that the desulfurization efficiency of a variety of chemical oxidants at room temperature is higher than that of A-hydrogen peroxide mixed solution, and the desulfurization rate reaches 20.72% The desulfurization rate of petroleum coke desulfurized by oxidation and re-firing at high temperature (1300 ℃) was significantly higher than that by direct calcination or only by oxidative desulfurization with a desulfurization rate of 55%. A acid-hydrogen peroxide mixed solution was chemically pre-oxidized The treatment will not destroy the graphite crystallite structure existing in the petroleum coke after calcining, and promote the formation of fine cracks on the surface of the petroleum coke, which is beneficial to the escape of sulfur in the coke during calcining and the combination of the calcined petroleum coke material and the coal tar pitch in the production process.