工业煅烧针状焦和煤萃取焦在磨光面的光学显微图象方面有明显区别,针状焦具有粗粒嵌晶结构、流线区和针状流线区等光学显微组织。煤萃取焦具有中粒及粗粒嵌晶结构的光学显微组织。把这两种焦炭在空气中氧化达1～25％重量损失,然后测定原焦炭及氧化过的焦炭的微强度。对针状焦来说,1％重量损失就可以明显地降低微强度值,而对煤萃取焦只有在15％重量损失以后,微强度开始降低。扫描电子显微技术对原表面及氧化了的表面的检查指出,针状焦的氧化是通过流线区内的微裂纹的发展以及针状流线区的基本表面的烧蚀而发生的。煤萃取焦表面是均匀烧蚀的。针状焦微强度值的下降与炭粒子的内部氧化有关。 Industrial calcination needle coke and coal extraction coke in the polished surface of the optical microscopic images have obvious differences, needle coke with coarse grain embedded structure, streamline area and acicular streamline optical microstructure. Coal extraction coke has medium grain and coarse grain embedded crystal structure of optical microstructure. The two coke oxidized in the air up to 1 ~ 25% weight loss, and then determine the original coke and oxidized coke micro-strength. For needle coke, a 1% weight loss can significantly reduce the micro-strength values, whereas micro-strength begins to decrease for coal-extracted coke only after 15% weight loss. Examination of the original surface and the oxidized surface by scanning electron microscopy indicated that the oxidation of the needle coke occurred through the development of microcracks in the streamline area and the ablation of the underlying surface of the needle streamline area. Coal extraction coke surface is uniform ablation. Decrease in the value of acicular coke microdensity is related to the internal oxidation of carbon particles.