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In the process of smelting iron alloy in the ore furnace, the lining is subjected to high temperature molten iron and slag for a long time. Taking 8MVA and 15MVA ore furnace as an example, when smelting ordinary manganese-silicon alloy, the temperature of the molten iron is generally around 1450 °C, and the slag temperature is 1380. At about °C, SiO2 and MnO in the slag form a low melting point of manganese silicate at 1240 ° C, and the initial temperature of the alloy solution containing 20% of Si obtained by reduction from MnSiO 3 is 1490 ° C smelting an alloy containing 22% or more of Si. The starting temperature exceeds 1490 °C.
In actual production, since the low-carbon manganese-silicon alloy is directly converted from the submerged arc furnace that has produced ordinary manganese-silicon alloy and the furnace charcoal brick is damaged to some extent, the high-temperature molten iron and slag have been damaged. The erosion of the furnace lining is more obvious, which is manifested in the leakage of molten iron and slag from both sides of the furnace and the "horse riding" charcoal. According to the average weight of molten iron, molten iron and slag density, furnace diameter and other data, in the production of low-carbon manganese-silicon alloy, the average height of molten iron in the 8MVA and 15MVA submerged arc furnace furnaces is about 47mm, 42mm, respectively. The average thickness of the layers is about 110 mm and 82 mm, respectively. When the diameter of the furnace eye is newly opened, it is about φ70mm. In the later stage of use, it is enlarged to about φ100mm, that is, the molten iron is soaked in the furnace eye from beginning to end. The slag iron wire is also lower than the upper edge of the furnace eye in each furnace production cycle, and the brick lining at the furnace eye is visible. The mud ball is continuously soaked by high-temperature molten iron and slag for a long period of time, forming a high temperature burning loss.
Each grade of manganese-silicon alloy has redox reaction in the furnace: SiO2·MnO+3C=MnSi+3CO (1)
During the tapping process, coke is discharged from the furnace eye in large quantities. When the reducing agent is insufficient, the new furnace molten iron reaction will use carbon in the furnace brick as a reducing agent to reduce SiO2·MnO to MnSi, that is, the furnace carbon brick is corroded by the physical reaction.
During the tapping process of the submerged arc furnace, since the slag iron is discharged from one furnace eye, the furnace eye brick is simultaneously washed by the high temperature molten iron and molten slag, resulting in high temperature mechanical corrosion.
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