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The Specific Construction Of Refractory Bricks For Rotary Refining Furnace Lining Should Be Done!
Feb 12, 2019

The lining of the rotary refining furnace can be divided into four parts: a furnace body body, an end wall, a furnace mouth and a smoke exhaust port, and the cylinder body is provided with an orifice such as a redox hole and a sampling hole. The end wall is divided into two types: flat end wall and dish end wall, as shown in Figure 1. The thickness of the lining varies depending on the size of the furnace, and is generally between 300 and 425 mm.

A, wall brick

(1) Flat end wall.

The flat end wall working face is masonry by horizontal twisting and bricklaying. A 65mm thick standard clay refractory brick is laid between the shell and the working layer, (or a 65mm thick refractory castable is cast), and the working layer of the end wall of the annular part where the end wall is in contact with the inner liner of the cylinder (Magnesium chrome brick), should be indented into the furnace face 50mm (knotted 50mm magnesium grid ramming material) as shown in Figure 2. The slag line is semi-recombined with magnesia chrome bricks, and the others are directly combined with magnesia chrome bricks. Insert the horse manure board into the vertical expansion joint to absorb the expansion of the brick. The vertical seam of each layer should be staggered and should not be on the straight line; horizontal expansion joint, according to the design requirements, put a layer of horse dung paper on each layer of 5~6 Absorb the amount of expansion of the brick; the circumferential triangular seam is filled with magnesium chrome ramming material.

(2) Disc-shaped end wall.

The disc-shaped end wall working surface is built by horizontal bricklaying. The mural form of the flat end wall is the same. The material of the brick is the same as the flat end wall. The masonry method, the expansion joint and the flat end wall have the same requirements. The difference is that the shape of the brick is different, the inner surface is smooth, and the wrong tooth is not allowed.

B, furnace body

Before the bricks are bricked, the 50mm thick permanent lining is smashed in the steel shell with a brine magnesia or a 65mm thick standard clay refractory brick.

Redox holes, magnesia chrome bricks at the sampling holes are made of straight seams for easy local repair and replacement.

The brick type is specifically designed according to the furnace specifications (cylinder diameter). The brick size of Φ4530mm cylinder bricks is 380mm×150mm×115/91mm and 75/59mm. The width of the staggered bricks is 225mm and the thickness is 115/91mm and 90/70mm. Finally, use a lock brick to tighten.

Expansion joints shall be retained in accordance with the design requirements of the masonry. Refining furnace lining bricks: circumferential seam, insert a 2mm thick horse dung board every 15 bricks; longitudinal seam, insert a 2mm thick horse dung board every two bricks. The shape of the cardboard is the same as the section size of the vertical wedge brick.

C, furnace floor brick

The bricks of the refining furnace mouth are the weakest part of the whole lining structure, especially the intersection of the furnace mouth and the circular cylinder, the shape is complex, so the junction of the furnace door lock brick, the furnace mouth brick and the barrel brick When building a masonry, you must be careful. When the masonry is built into the mouth of the furnace, it must be symmetrical from both sides to the center. The radial joint of the arch brick should be consistent with the radial direction, otherwise there will be wrong teeth or corner seams. When laying bricks, pre-laying should be used first to determine the processing capacity of the locking bricks.

The locking bricks shall be symmetrically and evenly distributed according to the centerline of the dome. The lock brick 2 should be placed at the same time as the bricks 1 and 3 on both sides, and then driven with a wooden hammer, which cannot be driven by a hammer.

Expansion joints shall be left in accordance with the masonry design requirements or in accordance with the amount of expansion provided by the refractory supplier.

D. Masonry of the copper outlet

The copper outlet brick has a single drilled shape and a combined shape, as shown in FIG. In the figure, 1, 2, and 3 are made of 6 pieces of composite bricks, and can also be built with a single piece of drilled brick. Regardless of the form of the brickwork of the copper outlet brick, it is necessary to ensure that the center of the copper outlet is aligned with the center of the copper opening of the casing to ensure the angle required by the design, and the error is not more than 2 mm, otherwise it is unqualified.

E, tuyere

The tuyere is made up of two tuyere bricks and eight large bricks around it. Due to the influence of cold air during the restoration, the tuyere bricks have a shorter life than the bricks of the furnace tube and often need to be replaced. Therefore, the masonry requires convenient disassembly and assembly. The structure is shown in Figure 5. In the figure, 1 and 2 are tuyere bricks, and 3 is a machinable brick. When laying the bricks, first align the tuyere bricks with the holes in the furnace shell, and ensure the angle required by the design, then build the bricks on both sides and the upper bricks. When dry, the thickness of the brick joint should be less than 1mm.

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