捣固焦微观结构研究

结合捣固炼焦工艺的特点,研究了高堆积密度配煤炼焦对焦炭微观结构的影响.结果表明,捣固炼焦工艺对焦炭气孔结构影响明显.采用N_2吸附法研究发现,9种捣固焦以小于10 nm的中、小气孔为主,平均气孔直径小,比表面积分布广泛;3种顶装焦存在一定数量20~50 nm的中孔,平均气孔直径大,比表面积小.捣固焦总气孔率、显气孔率和显气孔比例基本均低于顶装焦,捣固焦的假密度明显高于顶装焦,真密度相差不大,假密度可作为区分捣固焦与顶装焦的简易方法.焦炭光学组织主要取决于配合煤性质,捣固焦与顶装焦无明显区别.

Study on the Microstructure of Stamp Charging Coke

Applying the stamp charging technology， the effect of high-bulk-density coal blending on the microstructure of coke was investigated. The results showed that the pore structure of coke was greatly influenced by the stamp charging technology. The pore structure of cokes was examined by using N₂ adsorption technology. All 9 kinds of stamp charging coke contained mainly medium and small pores whose sizes were less than 10nm. The mean pore diameter was small and the specific surface area distributed widely. However， 3 kinds of top charging coke all contained a certain amount of medium pores of 20~ 50nm. The mean pore diameter was larger and the specific surface area was smaller. Compared with the top charging coke， the total porosity， apparent porosity and apparent porosity ratio of stamp charging coke were almost all smaller. The true density was nearly the same and the apparent density was lower obviously. So， it is easy to distinguish the top charging coke and stamp charging coke according to the apparent density. The optical textures of coke depend mainly on the quality of coal blends， while there is no significant difference between top charging coke and stamp charging coke.