冲天炉内炉底与溶化带下沿之间的焦炭柱叫底焦。溶化过程中底焦上面的金属料溶化经过底焦层过热后流入炉缸，底焦不断氧化变矮，需用层焦补充，保持底焦高度不变，溶化工程师根据风量、风压计算层焦高度，从而保证溶化正常进行。
无论是深底锅，平底锅还是焙盘都应该有很厚的底，这样才不容易翻倒，而且导热要好，这样食物才不会粘锅或是煮焦。
Pots, pans, and casseroles should be heavy-bottomed so they will not tip over, and good heat conductors so that foods will not stick and scorch.
有一个不沾锅，快要煮熟熏猪肉或培根肉，时不时搅拌以防焦底。
In a nonstick skillet, briefly cook the pork or bacon, stirring to prevent burning.
使用小粒度半焦可避免炉底缺碳，有利于电极深插，扩大坩埚，降低硅铁冶炼电耗。
Using small-sized semicoke can avoid lacking carbon in furnace bottom and is favourable to inserting electrode deeply, enlarging crucible and reducing eletricity consumption.
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