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

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