Rate of Desulphurization from Liquid Iron and Iron Alloys with Hydrogen
1976 Volume 62 Issue 1 Pages 33-42
Details
1976 Volume 62 Issue 1 Pages 33-42
A study has been made of the rate of sulphur removal from liquid iron and iron alloys, containing carbon, silicon, phosphorus, vanadium, and oxygen respectively, by hydrogen as a reaction gas at 1600°C. The results obtained are as follows:
1. The effects of alloying elements on the rate of desulphurization depend on the effect of the activity of sulphur in the liquid iron.
2. The reaction of sulphur removal is of the second-order, and it is considered that the chemical reaction on the surface of liquid iron is the rate-determining step. The rate of the reaction, H2 (gas) +S (in liquid iron) =H2S (gas), is expressed by the following equation:
-d [%S] /dt=A/VK2'PH2aS
where, A and V are the surface area and the volume of liquid iron.
3. The apparent activation energy of the sulphur removal is 11.0Kcal/mol.
4. The surface active element decreases the rate of desulphurization markedly. A mechanism of sulphur removal from liquid iron is proposed to describe the rate of reaction quantitatively, taking into consideration of the effect of the adsorption of the surface active element.
