Basic Concepts of Iron and Steel Making by Sujay Kumar Dutta & Yakshil B. Chokshi

Author:Sujay Kumar Dutta & Yakshil B. Chokshi
Language: eng
Format: epub
ISBN: 9789811524370
Publisher: Springer Singapore

13.7.2 De-sulphurization

In most steel plants outside Japan, pre-treatment of hot metal is confined to de-sulphurization in the transfer ladle with various injected materials such as lime plus spar, lime plus magnesium, calcium carbide plus magnesium or calcium carbide plus limestone.

In hot metal, the de-sulphurizing agent combines with sulphur present in liquid iron as a sulphide and is then transferred to the slag. The agent should be thoroughly mixed in hot metal, and the reaction product should separate out from liquid iron. With the introduction of powder injection technology, the de-sulphurization processes based on the use of powdered reagents have become more effective in attaining low sulphur levels in hot metal while reducing de-sulphurization cost. There are four reagents which are considered for external de-sulphurization of hot metal. These reagents are: (i) soda ash (Na2CO3), (ii) powdered lime (CaO), (iii) calcium carbide mix (CaC2-based powder mixture), and (iv) magnesium-based powders (Mg and inert material).

The quantity of magnesium (Mg) to be injected together with CaO or CaC2 is adjusted according to initial sulphur content of the hot metal. De-sulphurization occurs primarily by the following reactions:

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.