How to Construct Refractory Plastics to Achieve Zero Expansion

The fire-resistant plastic can be constructed conveniently and quickly, and the state of use is stable. If you want the plastic to achieve zero expansion, you need to adopt a zero-expansion design to offset the expansion and contraction of the plastic at high temperatures.

The plastic has a certain degree of plasticity when the temperature is high, and the zero expansion of the plastic is that it can withstand the drastic changes of the furnace temperature and resist frequent shutdown and heating. The mold can be dismantled immediately after plastic construction. If it is maintenance, no oven is needed, and it can be put into use directly as the furnace temperature rises.

The Construction of Plastic Refractory

However, during construction, attention should be paid to drawing-form construction to ensure that the deformation of the steel structure and the lining furnace are synchronized. In addition, the anchoring brick must be evenly stressed, so as to avoid breakage and roof collapse during use.

The zero-expansion design is to support the mold first during construction to ensure that the construction site is clean. Then lay refractory plastic blanks on the rammed part. Only a single layer of material can be laid each time with the hammerhead down, moving and overlapping back and forth to make the plastic smooth and compact. If the anchor brick is constructed, the refractory plastic ramming surface must be 16-20mm higher than the bottom surface of the anchor brick. Put a wooden mold on the anchor brick, straighten it and hammer out tooth marks. The plastic around the anchor bricks should be rammed and compacted.

Refractory plastic construction should be laid out and rammed layer by layer, and each layer should be shaved and kept at the same height as the construction surface. In case of intermittent plastic ramming, use a plastic sheet to cover the rammed surface. If it is snowing, shave the material surface. When the construction is interrupted for a long time, the joint should be left between the two rows of anchor bricks.

If the plastic is used on the top of the furnace, the force direction of the hammerhead should be level when ramming. The seam of the material surface and the working surface of the furnace top should be vertical, and the peeling layer must not overlap with the seam of the material surface during the production process. The plastic material should be rammed from the seam of the blank on the top of the furnace. When the construction is intermittent, cut the material vertical furnace shell into right angles and cover it with a plastic sheet to prevent water loss. Before using anchoring bricks or hanging bricks, the wooden mold bricks with the same tooth shape should be used to tighten and drive into plastics to form a tooth mark, and then the anchor bricks are embedded and fixed tightly.

Dismantle the mold as soon as possible after the plastic construction to disperse the water. When trimming, lightly beat the plastic around the end face of the anchor brick with a wooden hammer or a ramming hammer to make it tightly bite. Trimming includes shaving, piercing vents, or cutting expansion joints.

During construction, the refractory plastic can not be in contact with water. When constructing the castable in contact with the plastic, it is also necessary to make the plastic waterproof. The mold should be dismantled as soon as possible before drying to make the masonry dry naturally.

Due to the "zero expansion" design of refractory plastics, the masonry is filled with refractory fibers at the cracks and expansions after drying and baking to prevent the lining from venting and smoking at low temperatures. The cracks and expansion joints will close at about 1350℃.

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