Thesis

Kinetics of sulphur transfer from carbon saturated iron to slags

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Awarding institution
  • University of Strathclyde
Date of award
  • 1978
Thesis identifier
  • T3527
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Abstract
  • The kinetics of sulphur transfer from carbon saturated iron to GaO - MgO - SiO2 slag was investigated at 1460° G under CO gas atmospheres. To elucidate the reaction mechanism the present experiments were carried out varying the following reaction conditions sulphur content of metal, slag composition, melt geometry, Si addition MnO and FeO addition, and ambient pressure. The observed experimental results indicate that the desulphurization reaction is not controlled by either diffusion of sulphur in the metal or the slag but by an electrochemical reaction. Desulphurization takes place in three reaction stages controlled by different reaction mechanisms; the initial fastest stage is dependent on anodic reactions of iron transfer and CO evolution, the second medium rate stage is controlled by CO evolution, and the final slowest stage controlled by silica reduction from the silicate slag. The reaction mechanism during the initial stage is dependent on the properties of slag; for acid slag with high viscosity and low oxygen ion activity, the anodic reaction of iron transfer seems to be predominant whilst for basic slag with low viscosity and high activity of oxygen ion carbon monoxide plays a significant role. The effects of silicon additions to metal, and MnO and FeO additions to slag, and decreasing the ambient pressure result in increased desulphurization rates and confirm the proposed mechanisms.
Resource Type
Note
  • One copy only. Not for lending
DOI
Date Created
  • 1978
Former identifier
  • 99647743402996

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