Iron ore is reduced by hot carbon monoxide, which reacts with iron oxide to produce molten iron and carbon dioxide into blast furnace.
About blast furnace:
Generally used to smelt pig iron, but sometimes other industrial metals like lead or copper, a blast furnace is a type of metallurgical furnace. When combustion air is "forced" or provided above atmospheric pressure, this is referred to as a blast.
A hot blast of air (sometimes with oxygen enrichment) is blown into the lower part of the furnace through a network of pipes in a blast furnace so that the chemical reactions take place as the material falls downward. Fuel (coke), ores, and flux (limestone) are continuously supplied through the top of the furnace.
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