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        Refractory materials commonly used in blast furnace tapping and tapping ditch
        Source: | Author:. | Published time: 1045 days ago | 521 Views | Share:
        Taphole is the throat of hot metal discharged from blast furnace. Due to the large-scale blast furnace and the adoption of intensified smelting technology, the times of tapping increase, so its working conditions become more severe.
        Taphole is the throat of hot metal discharged from blast furnace. Due to the large-scale blast furnace and the adoption of intensified smelting technology, the times of tapping increase, so its working conditions become more severe. Gun mud is a kind of refractory material used to block the taphole, which is named after the use of mud gun. At present, most of gun mud is resin or asphalt combined with Al2O3-SiC-C material. The composition of gun mud can be divided into two parts refractory aggregate and binder.
        Refractory aggregate refers to refractory materials such as corundum, mullite and pyrogem, and modified materials such as coke and mica. The binder is water or tar pitch, phenolic resin and other organic materials, with addition of SiC, Si3N4, expansion agent and additives. The aggregate is composed of matrix according to a certain particle size and weight, and it has a certain plasticity under the coordination of the binder, so that the iron can be blocked by the clay gun. The clay with water as binder is called watery clay, and the clay with tar, resin and other organic materials as binder is called waterless clay.
        There are some special requirements for gun mud: 1. Good plasticity and cohesiveness;
        2. The volume shrinkage is smaller at high temperature;
        3. The porosity is moderate to drain water;
        4. The sintering property is better and the strength is higher;
        5. It is easy to open when tapping.
        The cast iron ditch is the channel to lead out molten iron or slag. The commonly used lining materials are ramming material, castable material and vibrating material, and the material is mainly al2o3-sic-c. The inner lining of cast iron trench shall have the following properties:
        1. It is resistant to erosion and erosion of molten iron and slag;
        2. The results show that the thermal shock stability is good and the volume change of reburning is small;
        3. Strong antioxidant capacity;
        4. No slag iron, no harmful gas, and easy construction.

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