Blast Furnace

Details Description

Blast furnace for rolling mill machine is of great importance in steel rolling process. Blast furnace smelting is the continuous production process of reducing iron ore into pig iron. Solid raw materials such as iron ore, coke and flux are fed into the blast furnace in batches by the top charging device and maintained at a certain height. Coke and ore form alternating stratified structure in the furnace. The ore material is gradually reduced and melted into iron and slag during the descent process, which is gathered in the hearth and released regularly from the iron port and slag hole.

Parameters

Reaction process

1. Carbon monoxide and carbon dioxide are produced by combustion of carbon.

2C+O₂→2CO

C+O₂→CO₂

CO₂+C ⇆2CO

2. Carbon monoxide and iron produce a redox reaction formula.

Fe₂O₃+3CO→2Fe+3CO₂

3. In fact, the reduction reaction is subdivided into the following three stages.

Fe₂O₃→Fe₃O₄→FeO→Fe

4. The reaction process temperature is expressed by T

320℃ < T < 620℃

3Fe₂O₃+CO→2Fe₃O₄+CO₂

620℃ < T < 950℃

950℃ < T

Removal of Impurity

Raw ore SiO2 generally contains impurities. Gray stone (principal component CaCO3) is usually added as an oxidant instead of lime (CaO) to produce a viscous reaction to remove impurities to produce slag calcium metasilicate (CaSiO3).

SiO₂+CaCO₃→CaSiCO₃+CO₂

Sub reaction:

CaCO₃→CaO+CO₂

CaO+SiO₂→CaSiCO₃