Abstract: 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.

Key words: stamp charging coke, top charging coke, pore structure, optical texture, apparent density