On the Pre-reduced Pellets Produced with Addition of Slag Formation Materials
1973 Volume 59 Issue 8 Pages 1069-1077
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1973 Volume 59 Issue 8 Pages 1069-1077
The effect of Ca (OH)2, SiO2 and pyrite addition on the shrinkage and metallization of pre-reduced pellets Was studied. The results are as follows:
SiO2 addition was not favorable either from the point of strengthening or of the quality of the pellets. Only 0.2% of pyrite was effective in pellet shrinkage, and pellet strength increased. However, desulphurization was needed because of remains of high percentage of sulphur after reduction.
Ca (OH)2 addition was very effective both in strengthening and in the quality of pellets. The amount of Ca (OH)2 needed for strengthening and for quality improvement differed according as the kinds of are used and the reduction conditions. In the case of reduction at 1 250°C, it was found that an addition of around 4% of Ca (OH)2 was generally effective owing to the formation of slag containinga large amount of CaO.
Pre-reduced pellets which are produced with an addition of CaO can be expected to have a quality of of easy fusibility in tne melting process of pellets, because metallic iron is surrounded by slag which has a low melting point as well as being low in FeO.
