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Chromite based ladle nozzle filling sand

[2016-07-01]

Chromite based ladle nozzle filling sand is made from chromite sand and additives, it has the advantages of high density, good fluidity, high melting point, not over sintered, etc.. When the chromite sand content in chromite based ladle nozzle filling sand is over 60%, the chromite sand will be in continuous distribution, which will help forming continuous sintered layer. Under high temperature, the FeO in chromite sand will dissolve and form secondary spinel, which will change the volume of sintered layer and then cause cracking, when the slide gate plate is opened, the unsintered filling sand at the lower part of nozzle will flow out very quick, the cracks on sintered layer will expand very fast, under the static pressure of molten steel, the sintered layer will be completely broken, automatic opening is achieved. refractories material chromite based ladle nozzle filling sand is adopted by most of the large size steel plant, it has over 30% market share, especially in LF furnace.
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