Nozzle filling compound minerals, also known as NFG or Nozzle Filling Granules, are a type of material used in the steelmaking industry to fill the nozzle of the blast furnace. They are made from a blend of high-purity minerals, such as magnesia, alumina, and graphite, which are carefully selected and processed to create a high-quality powder. The granules are typically mixed with water to create a slurry, which is then poured into the nozzle of the furnace to seal it and prevent the molten metal from leaking out. Nozzle filling compound minerals are widely used in the steel industry, where they play a critical role in ensuring the safe and efficient operation of the blast furnace. They are known for their high refractoriness, excellent thermal conductivity, and good mechanical strength, which make them suitable for use in high-temperature environments. In addition, they are also used in the manufacturing of refractory materials, ceramics, and abrasives, due to their unique properties and versatility.