Impurities were burnt away with the use of coke, producing a high-quality refined iron.
杂质用焦炭烧掉，产生高质量的炼铁。
2
The great inventions of that century-the steam engine, mechanical spinning, smelting iron with coke-all served to economise on the expensive factor of production and use more of the cheaper one.
那个世纪的伟大发明如蒸汽机，机械纺纱机，焦炭炼铁大大的节省了高额生产成本，使其更为低廉。
3
As a simple overview, the blast furnace needs coke from the coke plant to reduce the iron ore (iron oxide) to iron.