通过热力学分析,建立了硫分配比与硫容量的关系,用热力学软件FactSage计算渣中Al2O3活度,用KTH模型计算渣的硫容量,对SPCC(一般用冷轧碳素钢薄板坯钢带)两个浇次10炉钢水在LF进站和出站时取钢、渣样以及测氧和温度,通过分析钢样和渣样成分以及生产检测数据,分析了温度、炉渣成分和钢水成分对LF精炼脱硫的影响规律.定义了硫分配比对钢液中溶解氧活度的急剧变化区(a[O]＜4×10 6),在该区内硫分配比对钢液中溶解氧活度十分敏感,钢液中氧活度的增大导致硫分配比的迅速减小,温度升高,a[O]升高,不仅抵消了升温对脱硫反应轻微的促进作用,反而使硫分配比随温度升高而减小.LF精炼过程Al-O反应未达渣-钢平衡,实际[O]活度介于平衡计算值与Al2O3活度为1的计算值之间,故渣钢硫分配比也介于二者之间.精炼渣二元碱度升高则硫分配比增加,wCaO/wAl2O3在1.6～2.0时脱硫效果较好,硫分配比并不随[Al]s含量的增加而增大,所以用增加W[Al]s来脱硫效果并不明显.钢中夹杂铝(W[Al]1-W[Al]s)降低到10×10-6以下,硫分配比明显升高.
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