材料期刊网

利用脱氧平衡最低值理论公式,计算了1 573K下铁水中基于[Al]-[O]平衡和[C]-[O]平衡的氧含量。计算得出[C]-[O]平衡和[Al]-[O]平衡的最低氧质量分数分别为34×10-6和0.015×10-6,但是计算的[C]-[O]平衡控制的最低氧含量相当于由[C]-[O]平衡决定的氧含量的近4倍。因此,在KR铁水脱硫过程中,铝脱氧控制铁水中的氧势。另外,计算结果表明,在铁水预处理过程中,硅的脱氧能力远不及碳和铝,且脱氧平衡最低值理论公式对铁水预处理也具有适用性。铝脱氧结果表明,每吨铁水中加入0.44kg的铝,可使铁水温度升高20℃左右,在一定程度上可弥补KR铁水脱硫过程中因搅拌、脱硫剂的加入所造成的温降。

The oxygen content in hot metal was theoretically calculated based on [Al]-[O]2 equilibrium as well as [C]-[O] equilibrium at 1 573 K by the formulas of the minimum deoxidation balance theory in metal phase. The cal- culated minimum oxygen content is about 34 〉（ 10 6 or 0. 015 ）4 10-6 controlled by [C]-[O] or [Al]-[O] equilibrium, respectively. The calculated minimum oxygen content controlled by [C]-[O] equilibrium is about 4 times as great as the determined oxygen content by [C]-[O] equilibrium. Therefore, the oxygen potential of hot metal was controlled during KR hot metal desulphurization process by the aluminum deoxidation process. In addition, the calculated re- sults show that the silicon deoxidation ability is far lower than that of carbon as well as aluminum during hot metal pretreatment operations, and the formulas of the minimum deoxidation balance theory in metal phase can be used to determine oxygen content in hot metal pretreatment with good accurate. The calculated results show that the deoxi dation reaction by adding about 0.44kg aluminum per ton hot metal can make hot metal temperature increase 20℃. This function can to some degree counteract the temperature decrease caused by stirring and adding dedesulfurizer during KR hot metal desulphurization process.