At present, magnesia-chrome bricks are the main refractory materials for RH furnaces. Compared with other refining equipment outside the furnace, the refractory materials used in the RH vacuum tank are not only eroded by high-temperature molten steel and slag during the treatment process, but also subjected to high-speed scouring of molten steel and rapid changes in temperature. Therefore, more stringent requirements are put forward for refractory materials. However, with the increase of smelting strength and the continuous change of smelted steel grades, the service life of the existing magnesia-chrome bricks can no longer meet the requirements of energy saving and consumption reduction. In order to solve this problem, on the basis of the original magnesia-chrome bricks, we developed high-performance fused rebonded magnesia-chrome bricks, which were applied in RH furnaces and achieved good results.
In order to improve the performance of the existing magnesia-chrome bricks, fused magnesia-chrome sand and chrome ore with high Cr2O3 content and high purity are selected as the main raw materials. The effects of Cr2O3 content and additives such as high-purity magnesia, TiO2, Cr2O3 micropowder on the properties of magnesia-chrome bricks were studied.
In 2006, the company trial-produced high-performance fused magnesia-chrome bricks with Cr2O3 content of 26%, which were used on the lower groove of RH furnace 1, with a service life of 300 furnaces, a 22% increase in service life. In February 2007, it was used in the lower groove of RH furnace 2, the service life reached 458 furnaces, the service life was increased by 17.4%, and the service life of lower groove refractory material was the longest, which saved a lot of energy and played a role in energy saving. The effect of reducing consumption.
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