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世界上各地区冶铁发展史都是从块炼铁开始的。原料是用含铁量较高的富铁矿矿石和木炭,木炭燃烧生成一氧化碳,使铁矿石中的氧化铁还原成金属铁。早期的炼铁利用自然通风或皮囊一样的(?)(tu(?))。由于冶炼温度不高,化学反应较慢,得到的是没有熔化、含碳极低、质地疏松的熟铁块。矿石中其他未还原的氧化物和杂质只能趁热锻打挤出一部或大部分。据文献记载公元前
The history of the development of iron smelting in various regions of the world begins with iron smelting. The raw material is iron ore with high iron content and charcoal, charcoal combustion of carbon monoxide, the iron ore in the reduction of iron oxide into metallic iron. Early iron making use of natural ventilation or bladder like (?) (Tu (?)). As the smelting temperature is not high, the chemical reaction is slow, get is not melting, very low carbon content, loose texture of cooked iron. Other unreduced oxides and impurities in the ore can only be hot forged out of one or most of them. According to the literature BC