Wear of High Aluminous Refractories Used in Torpedo Car by Slag with Calcium Carbide

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  • カーバイド系脱硫スラグによる高アルミナ質混銑車耐火物の損傷
  • カーバイトケイ ダツリュウ スラグ ニヨル コウ アルミナシツ コンセンシャ

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Abstract

Recently, desulphurization of molten pig iron is usually carried out in torpedo car by calcium carbide or calcium oxide. In this paper, mechanism of wear of high aluminous refractories by slag containing calcium carbide was studied. Microstructure of cross sections of the refractories used in torpedo car shows that dense reacted zone with isolated corundum crystals and altered zone with a number of cracks were formed in the side of working face. Basicity (CaO/SiO2) of the slag in torpedo car increased from 0.1-0.4 to 1.6-4.5 during desulphurization. Mechanism of reactions between high aluminous refractories and several kinds of synthetic slags composed of calcium carbide and/or blast furnace slag was studied. The blast furnace slag dissolved the refractories much more than the other slags did. In the reacted zones, metallic silicon particles and needle-like corundum crystals were formed. The silicon is considered to be formed as a result of reduction of silica in the refractories by CaC2. The reduction of silica or formation of minerals such as calcium aluminates or calcium aluminum silicates may result in the crack formation. In conclusion, wear of refractories in the slag line of torpedo car would proceed by the repetition of the following steps: (1) the formation of reacted zones and altered zone with a number of cracks during desulphurizing operation, and (2) the dissolution of the reacted zones into low basicity slag.

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