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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 based on [Al] - [O] equilibrium and [C] - [O] equilibrium in hot metal at 1 573 K was calculated by using the theoretical formula of the lowest deoxidation balance. The lowest oxygen mass fractions calculated for [C] - [O] and [Al] - [O] balances were 34 × 10-6 and 0.015 × 10-6, respectively, but the calculated [C] - [O] The lowest controlled oxygen content corresponds to nearly 4 times the oxygen content determined by the [C] - [O] balance. Therefore, during the hot metal desulphurization of KR, aluminum deoxidation controls the oxygen potential in hot metal. In addition, the results show that during the hot metal pretreatment, the deoxidation ability of silicon is far less than that of carbon and aluminum, and the theoretical formula of the lowest deoxidation equilibrium is also suitable for hot metal pretreatment. Aluminum deoxidation results show that adding 0.44kg of aluminum per ton of molten iron can increase the temperature of the molten iron about 20 ℃, to a certain extent, make up the temperature drop caused by the addition of the desulfurizer due to the stirring of the molten iron in the KR molten iron.