Low Cement Castable

Low Cement Castable Feature
 
The water consumption is small, only 1/2-1/3 (about 5-7%) of ordinary refractory castables, so the bulk density is high, the porosity is low, there is no obvious dehydration stage during baking, and the thermal shock performance is good. It is comparable to baked refractory products.
 
The use of refractory cement is greatly reduced, the high temperature use performance and slag resistance of the refractory material are improved.
 
There is little hydrate or anhydrous compound after molding and curing, and there is no hydration bond damage during baking, which affects the medium temperature strength. Therefore, the inconvenience of medium temperature or high temperature does not decrease, but increases.
 
The low fire refractory castable has a refractoriness of more than 1790 ° C, and the load softening temperature (deformation 4%) at 0.2 MPa is 20 to 100 ° C higher than that of the CA50 cement refractory castable. Therefore, the use temperature is generally about 100 ° C higher than that of the CA50 cement refractory castable of the same refractory material.
 
The coefficient of thermal expansion of low cement refractory castables exhibits an expanding characteristic throughout the heating process. It can be seen that as the heating temperature increases, the thermal expansion rate increases to a maximum at 1250 ℃, which is about 0.68%. Thereafter, a slow shrinkage was started, and the coefficient of thermal expansion at 1400 ° C was 0.43%. When the temperature was 1500 ° C, the coefficient of thermal expansion returned to 0.5%.
 
Low Cement Castable Application
 
Low cement castable refractory is suitable for petroleum, metallurgy, chemical industry and various silicate kiln furnaces, such as some components of refining equipment outside the furnace, refining bag cover outside the furnace, integral spray gun for molten iron, treated steel water, electric furnace top lining body, soaking furnace, heating furnace, retreat furnace lining, tapping tank, tundish lining, high temperature burner and blast furnace tapping groove cover, ladle lining, etc.
 
The vibrating low cement refractory castable is suitable for heating furnace, various heat treatment furnace, electric furnace cover, shaft kiln, rotary kiln, blast furnace tap hole, ladle, ladle, etc. Self flowing low cement castable is suitable for metal. The lining of the high temperature refractory member of the anchor, such as the water cooled pipe lining of the heating furnace, the spray gun metallurgy integral spray gun lining, the RH, DH vacuum degasser immersed pipe lining, the ladle gas supply component and the petrochemical catalytic cracking reaction The high temperature wear-resistant lining of the device; used for the construction of complex structures, the refractory castables manufacturers of industrial can also customize the production of low cement refractory prefabricated parts according to customer needs, construction, installation, convenient and quick.
 
Low Cement Castable Advantage
 
The low cement series refractory castables are characterized by high density and high strength, which bring benefits to the use, but bring trouble to the baking, that is, improper baking, prone to flaking or bursting. Therefore, various countries have carried out various researches on the baking of low cement series refractory castables. The main technical measures are to formulate a reasonable oven curve and use an excellent explosion-proof admixture, etc., so that the moisture in the refractory castable molded body can be smoothly removed without any influence.
 
Due to the low content of calcium oxide in low cement refractory castables and less impurities, the regrind, corrosion resistance, high temperature strength and high temperature volume stability of the castable itself can be improved.
 
1. Low cement refractory castable can be used in a variety of construction methods, more convenient and fast.
 
2. Casting the inner lining with low cement refractory castable for longer service life.
 
Low Cement Castable Manufacturing Process
 
Raw material selection a variety of raw material ingredients forced mixing inspection, packaging and storage factory inspection, loading.
 
Since refractory castable is to be used within the specified time, generally 6 months, the refractory product has less inventory, but the output is high. After receiving the order, the production can be completed in a short time, or customized according to customer needs. product.
 
1. Determine the raw materials used in low cement refractory castables according to the application.
 
2.according to the formulation of raw materials, screening aggregate size and aggregate of aggregate size, determine the proportion of each raw material, and strictly control the formulation of materials.
 
3.According to the order of ingredients, firstly mix and stir the powder, then stir the aggregate evenly, mix the powder with the aggregate, and control the mixing time, generally 8-10 minutes.
 
4.Packing the stirred cast bulk material, and at the same time, it is equipped with a binder and an additive.
 
5.The installed low cement refractory castables are placed in the warehouse to prevent moisture and water.
 
Low Cement Castable Using Precautions
 
1.When storing, do a good job of moisture proof and waterproof work to prevent agglomeration of the refractory castables.
 
2.Strictly control the water consumption to ensure that the pouring refractory material is easy to construct.
 
3.The castable material produced each time is not too much, so as to prevent the castable from being used for condensation.
 
4.When baking, pay attention to the heating rate, not too fast.
 
The low cement refractory castable is different from the traditional refractory castable: in the low cement matrix, some or most of the calcium aluminate cement is replaced by a fine powder having the same or similar chemical composition as the main material of the castable. The low cement refractory castable belongs to a castable in which hydration combines and agglomerates in combination.