工艺参数对热压铁焦抗压强度的影响

热压铁焦是一种新型含碳复合炉料,高炉使用铁焦有助于降低热空区温度、减少CO_2排放.研究了工艺参数对热压铁焦抗压强度的影响,并分析其作用机理.研究结果表明,在一定范围内,铁焦抗压强度随着铁矿粉配比增加先增加后降低,在矿粉配比15%时取得较大值3 490.89 N;随着烟煤配比的增加而提高;随着热压温度的提高而提高,在热压温度350℃时取得较大值4 305.50 N;随着炭化温度的提高先降低后提高;随着炭化时间的增加先提高后降低,在炭化时间4 h时取得较大值3 518.80 N.从抗压强度角度考虑,热压铁焦合适的制备工艺参数为10%~15%铁矿粉,60%~70%烟煤,热压温度300~350℃,炭化温度1 000~1 100℃,炭化时间2~4 h.

Effect of Process Parameters on the Compressive Strength of Iron Coke Hot Briquette

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.