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.

Magnesia Chrome Bricks in Cement Klin

Magnesia Chrome Bricks in Cement Klin Introduction

Magnesia chrome bricks in cement kiln are refractory products containing magnesia and chrome as the main components, the periclase and spinel are the main mineral components. Magnesia chrome bricks have high refractoriness, high temperature strength, strong resistance to alkaline slag, excellent thermal stability, certain adaptability to acidic slag. The main raw refractroy materials of magnesia chrome refractory bricks are sintered magnesia and chromite. The purity of the magnesia raw material should be as high as possible.

Magnesia Chrome Bricks in Cement Klin Features

1.Refractory brick have high refractoriness

2.Fire brick have high temperature strength

3.Fired brick have excellent thermal stability

4.Brick refractory have strong resistance to alkaline slag

Magnesia Chrome Bricks in Cement Klin Property

1 Chemical Composition and Mineral Composition

The chemical composition of magnesia chrome refractory bricks of cemet industry varies with the ingredients used. Generally, the total amount of magnesium oxide is 55% to 60%, the chromium oxide is about 10%, followed by impurities such as ferric oxide and a small amount of alumina, silica, and calcium oxide.The mineral composition of magnesia chrome fire bricks are mainly magnesium chrome spinel bricks and magnesium ferrite.

2 Refractory Magnesia Chrome Bricks Refractoriness

Because the content of periclase in magnesia chrome fire brick is less than that of magnesia refractory brick, the content of magnesia chrome spinel bricks and magnesium ferrite is much, and the melting point of their eutectic compound is relatively low. Therefore, the magnesia refractory brick of magnesia chrome brick is low, generally only 1850. ~1960°C.

3 Magnesia Chrome Refractory Bricks Load Softening Temperature

The periclase crystal and refractory brick magnesia chrome spinel refractory in the magnesia chrome refractory bricks are easy to form a network skeleton, because the low melting point filled in the network gap is less quality, when subjected to high temperature load, although the low melting point material softens, the mesh is soft. The skeleton can still support the load, so the load softening temperature of the magnesia chrome refractory brick is higher, generally up to 1550 °C. The degree of refractoriness of fire brick is slightly lower than that of magnesia bricks, the load softening temperature is higher than that of magnesia refractroy bricks.

4 Magnesia Chrome Fire Brick Thermal Expansion and Thermal Shock Stability

Among the magnesia chrome refractory bricks, the content of magnesia chromium spinel and magnesium ferrite is large and the coefficient of linear expansion is small. Meanwhile, the porosity of magnesia chrome firebrick is larger than that of magnesia brick, so the thermal expansion property of magnesia chrome brick is small.

The content of calcium magnesium olivine in magnesia chrome brick is very small, it is not easy to cause anisotropic expansion stress; magnesium ferrite is dissolved in magnesia-chromium spinel, solubility is large, the dissolution temperature range is also wide, the dissolution and precipitation of magnesium ferrite It does not cause large stresses. Therefore, the thermal shock stability of magnesia chrome firebricks was good, the number of water-cooling can reach about 25 times.

5 Fireproof Magnesia Chrome Brick Slag Resistance

Magnesia chrome spinel refractory bricks, which is rich in magnesia chrome refractory bricks, is a composite of magnesium oxide and chromium oxide, and chromium oxide is a typical neutral oxide. Therefore, magnesia chrome bricks attack alkaline and acid slag,and have strong resistance.

Magnesia Chrome Bricks in Cement Klin Specification

Index Item	RS-MGe6	RS-MGe8	RS-MGe12	RS-MGe16	RS-MGe20	RS-MGe22	RS-MGe26	RS-MGeB	RS-MGeB10
Mgo(%)	80	72	70	65	56	49	45	71	67
Cr2O3(%)	7	10	13	17	22	24	27	9.6	12
CaO(%)	1.2	1.2	1.2	1.2	1.2	1.2	1.2	1.5	1.5
SiO2(%)	3.8	4	4	4.2	3	4.5	5	3.5	3.8
Al2O3(%)	4.5	6.5	6	6	10.5	11	12	6	6.5
Fe2O3(%)	4	4.8	5.5	6.5	7.3	10	10	8.5	9
Apparent porosity(%)	17	18	18	18	19	20	20	12	12
Bulk Density (g/cm3)	3	3	3.02	3.05	3.07	3.02	3.1	3.1	3.1
Cold Crushing Strength(Mpa)	55	55	55	50	50	55	45	80	80
0.2Mpa under load Refractoriness ( ℃）	1600	1600	1600	1600	1620	1620	1620	1570	1570

Magnesia Chrome Bricks in Cement Klin Application 

1.Steel making lining

2.Cement rotary kiln

3.Glass kiln regenerator

4.Refining ladle permanent layer

5.Non-ferrous metallurgical furnace, lime kiln

6.Mixed iron furnace and refractory high temperature kiln lining

Magnesia Chrome Bricks in Cement Klin Manufacturing Process

1.Magnesia Chrome Bricks Particulate Component

The proportion of chromium ore and magnesia added is determined according to the requirements of Cr2o3 content and the actual content of CrO2 in chromium ore.

The choice of size is adjusted to the environment in which the magnesia chrome refractory brick is used.

The most common practice is to add the chrome ore as a particulate component, which is added as a fine powder and a portion of the particulate component.

When emphasizing the thermal shock resistance of magnesia chrome bricks, the granule limit of chrome ore is added or the proportion of chrome ore coarse particles is increased.

When emphasizing the corrosion resistance of magnesia chrome bricks, a fine powder of magnesium ore and a part of chrome ore is added.

2.Magnesia Chrome Bricks in Cement Klin Mixing

In a wet mill, a mixer, and a powerful countercurrent mixer.

Bonding agent: sulfite pulp waste liquid, brine, magnesium sulfate solution, can be used, and the amount added is about 3%.

Feeding sequence: first add particles and then add binder solution, then add fine powder, etc. When the CaO content in the brick is high, the material can be used as needed to prevent brick cracking.

3.Magnesia Chrome Bricks in Cement Klin Molding

Magnesia chrome refractory bricks can be formed by friction brick pressing, the hydraulic pressing machine can be pressed on both sides to make the density of the blank uniform. Light and heavy first, multiple pressurization is beneficial to the exhaust, preventing the brick from cracking due to elastic after effect.

4. Magnesia Chrome Bricks in Cement Klin Drying

The purpose of drying is to remove the physical water in the green body binder to increase the height of the brick, reduce the bricks and burn waste,Generally used tunnel kiln dryer drying.

5. Magnesia Chrome Bricks Yards Refractory Brick

The code bricks of magnesia chrome bricks should be left with a larger fire channel, appropriately reduce the density of the bricks, increase the heating speed of the bricks in the pre-tropical zone.

Magnesia Chrome Bricks in Cement Klin Manufacturer in China

Rongsheng kiln refractory material factory specializing in the production of refractory bricks for nearly 20 years, now has formed a comprehensive enterprise for the production of refractory materials for the metallurgy, building materials, power, and chemical industries.

Main refractory products as follow

1)Various industrial furnace series refractories

High-alumina brick, anchor brick, clay brick, lightweight insulation brick, high-strength diatomaceous earth brick, low-iron mullite brick, silica brick

2)Heat storage balls for various industrial furnace regenerators

Special corundum heat storage balls, honeycomb, regenerator block, tapping chute brick,Anti-stripping high-alumina bricks for cement industry, alkali-resistant bricks, phosphate bricks, etc.

3)Industrial furnace and power generation boiler industry with various brands of wear-resistant bricks, corundum brick, mullite bricks and other stereotypes.

4)Wear-resistant castables, corundum castables, low-cement high-strength castables, impervious materials, self-flowing materials, plastics, and other unshaped refractories.

Products exported to the United States, India, Japan. South Korea, Pakistan and other countries

Welcome to inquiry, Provide free price list sheet.