Special Refractory Bricks among Unshaped Refractory Materials

Special refractory bricks among amorphous refractory materials are a mixture of aggregates, powders, binders, or other additives in a certain proportion, which can be used directly or mixed with appropriate liquids. In other words, the refractory material is a new type of refractory material that does not undergo calcination, and its refractory resistance is not less than 1580°C.

There are many types of unshaped refractory materials, which can be divided into concrete, castables, plastics, ramming materials, gunning materials, projection materials, smear materials, dry ramming materials, and refractory clay materials according to their production methods and usage methods. Various furnace repair materials (asphalt and large surface repair materials, Martin sand, etc.) are also unshaped. Although there are many types of uncertain product names, their typical production methods mainly include the following three forms:

1. Concrete: Concrete technology appeared earlier and is a final product among undefined products. Some parts of the heating kiln, such as the soaking furnace, heating furnace roof and walls, front and rear mouth rings of the rotary kiln, lower material slope, discharge chamber wall, etc., are designed as large masonry (the heating furnace top block weighs 3-4 tons ) to make concrete. The specific production method is to inject castables into the model, vibrate the mold, and perform heat treatment after demoulding. The concrete supplied to the user is not essentially different from the machine-pressed bricks in use except for the size and weight of the blocks. After this kind of castable is processed by the manufacturer, its water consumption is 10% less than that of on-site pouring. The processing quality is good and the quality is stable. Because the bricks are large and heavy, lifting equipment must be available on site. As long as hoisting construction can be carried out on-site, concrete should be used as much as possible, or it should be made into a smaller shape and hoisted by several people. Concrete does not require special heat treatment, which makes perfect sense.

2. Castable: Castable is the raw material and proportioning plan provided by the refractory material factory. On-site processing, compaction by vibrator, and heat treatment after curing. Due to the limitations of site conditions, the quality of castables is unstable, but the integrity of castables is better than concrete. Because the heat treatment quality of concrete is different from the quality of castables. Raw material consumption is 5%-8% more than concrete.

3. Plasticity: In terms of production methods, plasticity is between concrete and castables. The refractory material factory turns the castables into plastic mud strips. Retarder is included in the ingredients and packed in plastic bags. Construction and heat treatment take place on-site. The biggest problems in plastic applications are that knotted joints are easy to fall off, improper dosage of retarder, or poor plastic sealing, which is easy to harden and agglomerate.