We can extract iron from haematite by heating it with carbon in a blast furnace.
我们可以把赤铁矿和碳在鼓风炉内一起加热来提取铁。
In the steel-making process, the extract mine have to be made as balls to meet the need of blast furnace smelt, and the cylinder ball-making machine is made to meet this purpose.
在炼钢的过程中，需要将细磨精矿制成球团来满足高炉冶炼的要求，圆筒造球机就是专门用于生产球团的专用设备。
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