The tap hole is a very important part of the blast furnace, and it is the channel for discharging molten iron and slag from the blast furnace. Due to the large-scale blast furnace and the application of enhanced smelting technology, the number of taps has increased, so the process conditions have become more severe. In order to prevent the gas from being ejected, the blast furnace is blocked by mud immediately after the tapping of molten iron and slag is completed. Since the mud is squeezed in by a mud gun, this kind of mud is called tap mud, which belongs to the category of non-standard mud. One of the shaped refractories. During the operation of the blast furnace, high-temperature slag, molten iron and high-pressure gas jets frequently erode the tap hole, and when the tap hole is blocked, the impact of the high-pressure taphole mud and the impact and vibration of the mud gun make the brick village near the tap hole easily damaged. Therefore, it is particularly important to block the tap hole and reduce the damage of the tap hole. It can also be said that the tap hole controls the life of the blast furnace.
What properties do the tapholes of blast furnaces require?
The tap hole of the blast furnace must be opened and filled many times. The hot molten iron and molten slag will have physical and chemical effects on the clay, which will damage the clay.
Poor, a series of problems will occur during use, such as wet iron mouth, broken iron mouth, shallow iron mouth, etc., the work of the iron mouth is deteriorated, the qualified rate of the iron mouth is reduced, and the normal life of the blast furnace is affected.
even cause personal safety accidents. Therefore, it is required that the tap hole clay should have the following properties:
(1) High refractoriness, can withstand the effect of high temperature iron slag melt;
(2) Strong ability to resist the erosion of iron slag melt;
(3) Moderate plasticity, easy to operate the mud gun and form the taphole mud bag;
(4) Good volume stability, small volume change at high temperature, no leakage of molten iron due to shrinkage;
(5) It can be sintered quickly and has sintering strength;
(6) The opening performance is good, and the opening machine bit is easy to drill
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