造滓成分を添加して製造した還元ペレットについて

概要

論文の詳細を見る
The effect of Ca(OH)_2, SiO_2 and pyrite addition on the shrinkage and metallization of pre-reduced pellets was studied. The results are as follows : SiO_2 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 ore used and the reduction conditions. In the case of reduction at 1250℃, it was found that an addition of around 4% of Ca(OH)_2 was gencrally effective owing to the formation of slag containing a 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 the melting process of pellets, because metallic iron is surrounded by slag which has a low melting point as well as being low in FeO.
1973-07-01