The monolithic refractories casting furnace is often important. If the refractories are properly selected and the structural design is unreasonable, they must be baked before they are used for the first time. The baking temperature must be strictly controlled and will not achieve good results. Tube processing plant quenching furnace burners, after the implementation of the burning requirements, not according to the baking system operation, heating rate is too fast, often the rational selection of the nozzle brick refractories and the transformation of the burner structure, causing the pouring body burst or The formation of micro-cracks within the castable body has affected the life of the burner significantly, from the original six months to two years. A careful observation of the furnace wall of the holding furnace at the production site reveals a hard particle that adheres to it. This particle has a smooth, grayish black surface and is precipitated Si particles. In the same way, the free Si precipitated inside the liquid of aluminum gathers together and solidifies with the molten aluminum during casting, forming a smaller "hard spot" inside the casting.
The refractories used for flaking aluminum water bags, holding furnaces, etc. are made by hammering or pouring unshaped refractories. Its firmness is inferior to that of firebricks, and it is easily peeled off when washed by aluminum liquid. In addition, long-term contact with aluminum liquid, some alloy elements with high vapor pressure and strong reducing ability (such as Mg, etc.) can easily infiltrate into the refractories, causing the refractories to be eroded, and then flaking off. The refractory granules entering the molten aluminum due to flaking are difficult to settle to the bottom of the furnace due to their bulk density (2.4 to 2.6 g/cm3) close to the liquid phase of the aluminum, and they remain in the slag because of their surface density. In addition, "hard spots" form in the casting. Before the new furnace or new package is used, or after the furnace wall and furnace lining are cleaned and heated to near the use temperature, anti-seepage agent is applied on the surface of the refractory material to prevent and reduce the erosion of the refractory material by the aluminum liquid and alloy elements. .
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