Saved Bookmarks
| 1. |
When the ore haematite is burnt in air with coke around `2000 K` along with lime, the process not only produces steel but also produces a silicate slag that is useful in making building materials such as cement. Discuss the same and show through balanced chemical equation. |
|
Answer» First, by calcination and roasting, the ferrous oxide is oxidised of ferric oxde. Then, in blast furnace, smelting is done, where it is reducing to get iron. `4FeO + O_(2) rarr 2Fe_(2)O_(3)` `Fe_(2)O_(3) + CO rarr 2Fe_(3)O_(4) + CO_(2)` `Fe_(2)O_(3) + CO rarr FeO + CO_(2)` `FeO + CO rarr Fe + CO_(2)` In the basic Bessemer process for the manufacture of steel, the lining of the converter is made up of lime. The slag formed consists of `Ca_(3)(PO_(4))_(2)`. Phosphorous is oxidised to `P_(4)O_(10)`, which reacts with lime to form slag. `P_(4) +5O_(2) rarr P_(4)O_(10)` `6CaO + P_(4) O_(10) rarr underset (("Thomas slag"))(2Ca_(3)(PO_(4))_(2)`. |
|