Topower as the one of the best refractory clay mortar factories, this article will talk about the important place of refractory mud in refractory brick masonry.
Just like cement is needed to build a house, when all kinds of thermal kilns are built with refractory bricks, they also need to use Fire Clay Mortar, which is composed of refractory powder, binder and admixture, which plays the role of bonding and seaming refractory bricks. Fire Clay Mortar can be divided into clay, high alumina, siliceous and magnesia Fire Clay Mortar according to the material. Fire clay.
There are two expansion forms of refractory mud: one is that the Fire Clay Mortar in Fire Clay Mortar Factories itself is heated and expanded at a lower temperature, and when the temperature rises to a certain level, a liquid phase appears and begins to shrink; the other is that the expansion agent reacts at a higher temperature due to crystal transformation. volume expansion.
Fire Clay Mortar in Fire Clay Mortar Factories and refractory bricks bear the same load and high temperature, especially in the refractory brick masonry of large kilns. The softening temperature of Fire Clay Mortar under load is one of the indicators of high temperature service performance of refractory mud in Fire Clay Mortar Factories, which can reflect the actual use characteristics of refractory mud, and can also directly judge the temperature range of high temperature volume shrinkage of Fire Clay Mortar in Fire Clay Mortar Factories under load.
Masonry refractory bricks should be matched with Fire Clay Mortar in Fire Clay Mortar Factories of the same material, but the load softening starting point of Fire Clay Mortar is lower than that of refractory bricks,because Fire Clay Mortar in Fire Clay Mortar Factories produces large volume shrinkage at high temperature. Therefore, quality requirements are more important.
So how should Fire Clay Mortar be prepared and used?
The use of refractory clay
1. When building different refractory bricks, the Fire Clay Mortar in Fire Clay Mortar Factories of the corresponding material shall be used, and shall not be mixed.
2. The Fire Clay Mortar in Fire Clay Mortar Factories after stirring should be used immediately, and the hardened Fire Clay Mortar cannot be used again.
3. The Fire Clay Mortar in Fire Clay Mortar Factories should have appropriate viscosity and fluidity, so that the gap between the bricks is as small as possible (even less than 1 mm). The refractory mortar on the refractory bricks should fill the entire surface so that a complete expansion joint can be formed.
4. The particle size of Fire Clay Mortar in Fire Clay Mortar Factories is generally fine-grained refractory mud, which can also be selected according to the thickness of the ash joint. The maximum particle size should not be greater than 30% of the thickness of the ash joint.
On-site deployment of refractory clay
1. In order to make the refractory clay have suitable adhesion and good performance, water and high temperature binder should be accurately weighed and added according to regulations. The Baume degree of water glass is: ±38be (≥1.35g/cm3). After mixing in a special mixing vessel, add water until the right viscosity is obtained.
2. When preparing phosphate composite mud, it must be completed within the specified time, and the prepared mud should not be diluted with water at will. This mud is corrosive and must not come into direct contact with the metal casing.
3. The stirring can be done in two ways: mechanical or manual. The stirring time of each tank of mud is generally not more than 5mm. Manual stirring must be continued from the beginning of feeding until it is evenly stirred.
The importance of refractory clay
The deployment and construction of Fire Clay Mortar in Fire Clay Mortar Factories directly affects the life of refractory masonry. If the cohesion is not strong, or the powder is too coarse, it will also affect the use of refractory bricks. During construction, the amount of water added to the mud for bonding refractory bricks must be well controlled. If the amount of water added is too large, the mud will easily flow from the cracks of the bricks; if the amount of water added is too small, the mud will dry and the bricks cannot be bonded.
Fire Clay Mortar in Fire Clay Mortar Factories is an important bonding joint material in the process of refractory brick masonry. Its function is even more important than that of refractory bricks. If the quality of Fire Clay Mortar in Fire Clay Mortar Factories is not good enough, it will seriously affect the service life of refractory bricks. That is to say, the importance of refractory clay is even higher than that of refractory bricks.
