Refractory mortar is used as refractory masonry joints of amorphous refractory material, also known as joint material. By a certain particle ratio of refractory powder and binder, admixture composition, add water or liquid binder into slurry. Refractory mortar as a seam material, you can adjust the size of the brick deviation of the gas and uniform load balance, and masonry can be tightly integrated to resist the destruction of external forces and to prevent gas, molten liquid intrusion. Masonry joints are usually weak links in the gas, in most cases before the gas damage, so its quality is generally related to the overall life of the gas.

The classification

According to its binder coagulation hardening characteristics can be divided into hydraulic, hot hard, and gas hard. Hydraulic refractory mortar is a kind of cement as binder. It can be used at room temperature or may be in contact with water or water vapor often. Hot hard refractory mortar commonly used phosphoric acid or phosphate and other thermal hardening agent made. This kind of mortar has the characteristics of high strength at various temperatures, small shrinkage, tight joints and strong corrosion resistance. Gas hard refractory mortar commonly used sodium silicate and other gas hard binder preparation. This kind of mortar can make the masonry joints tight.

According to the different materials used in refractory powder, commonly used refractory mortar can be divided into: clay, high aluminum, siliceous, magnesia, carbonaceous, heat insulation and so on. Usually the material of the refractory mud is basically the same as that of the refractory masonry. Requirements for the special conditions of the mortar, the two materials can also be inconsistent. The use of refractory mortar material grade is higher than the masonry materials, such as ladle aluminum carbon on the mouth of the refractory mortar selection of chrome corundum material.

Clay refractory mortar

Clay-based refractory mortar with hard clay clinker as a base material, combined with soft clay or chemical binder, mainly used in blast furnace, hot stove, coke oven, soaking furnace, heat exchanger, boiler and other clay brick masonry joints and repair.

Clay is made from calcined clay (clinker), waste clay brick and clay (raw material). Clinker is the main component of clay, accounting for about 75% to 80%, raw clay is a binder, it is added to increase the plasticity of clay, reduce air permeability and water loss. But the amount should not be too large, or easy to produce cracks, with 20% to 25% is appropriate.

High-alumina refractory mortar

High-alumina refractory mortar’s main materials are high-alumina clinker and binder with soft clay or chemical binder. According to the masonry parts of the brick composition and use requirements determine the Al₂O₃ content. It can be widely used in high-alumina brick masonry of various industrial furnaces. Such as in the hot air furnace for masonry roof, regenerator, combustion chamber, etc., for the upper part of the blast furnace and other parts, can also be used to repair the industrial furnace roof, furnace wall and other parts. In addition to the above several kinds, there are silicon carbide, mullite quality, corundum, zirconium, and chrome refractory mortar. Its performance varies, respectively, with the same material Masonry and repair of refractory bricks. There are also special purpose mortars, such as anhydrous (non-aqueous) mortar, swelling mortar and so on.