Abstract: Iron coke hot briquette (ICHB) is a new type carbon iron composite， which is beneficial for blast furnace to decrease the temperature of thermal reserve zone and reduce CO₂ emission. In this paper， the effect of process parameters on the compressive strength of ICHB was investigated， associated with their functional mechanisms. The results showed that with the increase of iron ore addition ratio， the compressive strength of ICHB increased first and then decreased， which reached a higher value of 3490.89N with 15% iron ore addition. With increasing coal addition ratio， the compressive strength of ICHB increased， similar to the effect of hot briquetting temperature. When the hot briquetting temperature was 350℃， the compressive strength was up to 4305.50N. With the increase of carbonization temperature， the compressive strength of ICHB decreased first and then increased. However， the compressive strength increased first and then decreased with increasing carbonization time. Especially， when the carbonization time was 4h， the strength reached 3518.80N. Therefore， as the compressive strength is concerned， the reasonable preparation process parameters of ICHB are 10%~15% iron ore， 60%~70% bituminous coal， 300℃~350℃ hot briquetting temperature， 1000℃~1100℃ carbonization temperature and 2~4h carbonization time.

Key words: iron coke hot briquette (ICHB), compressive strength, process parameter, CO₂ emission reduction, blast furnace ironmaking