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Construction Scheme Of Refractory Lining Of Lining Cupola (2)
Dec 26, 2018

(3) Iron outlet, slag outlet and bridge

The tapping port, the slag tap and the bridge should be built with shaped bricks. If refractory materials are used for construction, high-quality refractory materials must be used to ensure the quality of the construction. In order to ensure that the molten iron in the hearth flows smoothly to the furnace, the bottom of the bridge should be repaired with a slope of 1: (10~20); in order to prevent the bridge from being blocked, the aperture of the bridge should be gradually enlarged. trend. Ensure that the diameter of the bridge and the hearth is the smallest, which can prevent the small coke in the hearth from getting stuck in the bridge, causing the bridge to block. The minimum diameter of the bridge hole can be selected according to Table 3. Generally, the bridge is first constructed with refractory bricks and slabs to form a ditch shape, and after the surface is coated with graphite powder coating (see Table 1), the bridge is covered with refractory bricks to form a complete bridge. When the bridge is blocked, the refractory brick covered by the top of the bridge can be opened to pass through the bridge. In addition, it is also possible to use a bridge pattern and tie the whole material to form a bridge, but the overall knotted bridge is difficult to clear after blocking.

Condensation at the tap hole and the slag outlet is likely to cause an accident in the cupola. In order to prevent condensation at the tap hole and the tap hole, the inside of the tap hole and the tap hole should be built into a large bell mouth shape, which is convenient for the heat of the iron in the front furnace. Passed to the taphole and slag outlet. The shape and dimensions of the tapping and slag forming bricks of the commonly used cupola are shown in Figures 1 and 3.

(4) Building the bottom of the furnace

The bottom of the furnace includes a cupola bottom and a front bottom. After closing the bottom door, first fill the gap of the bottom door with refractory mud, then use the crushed slag or waste sand to add the appropriate amount of water layer to lay the mat and the bottom layer of the furnace. The thickness of the cushion is generally 1/2~2/3. The bottom of the furnace is thick. When the bottom layer of the furnace sand knotted with waste sand is 50~80mm away from the top surface of the furnace bottom, 10% clay, 40% coke powder, 5% graphite powder and appropriate amount of water are added to the waste sand to be evenly mixed. The bottom layer of the furnace is repaired. The beating strength of the top material of the bottom of the furnace should be appropriate. It should not be too tight or too tight to ensure the tightness of the bottom of the furnace. Sandbags should be used as the beating tool, and tools with fixed shapes such as hammers and wooden hammers should not be used.

The annular joint between the bottom of the furnace and the side wall of the hearth is easy to form cracks and cause leakage of molten iron. Here, it must be compacted, and the intersection of the bottom of the furnace and the furnace should be rounded with a radius of about 40~60mm. The bottom of the furnace is grounded to a 1:10 (10~20) slope based on the bridge or the taphole to facilitate the flow of molten iron. After the bottom of the furnace is finished, the graphite powder coating is applied to the surface of the furnace bottom.

(5) Other parts

The iron trough and the trough are generally first constructed with ordinary clay bricks, and then the surface layer is built with the former furnace crucible. After the iron trough and the slag trough are completed, the surface is painted with graphite powder coating.

to sum up: 

Construction has always been a very important part of our work. The masonry construction of the cupola is no exception. The quality of the construction is the key to determining whether a furnace can meet expectations or even exceed the expected life cycle.

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