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Jun 30, 2021
Magnesia Iron Spinel Bricks

Magnesia iron spinel bricks is a type of new product developed by ourselves independently by the conclusion of years’ working experience and combining the advanced technology of related large scale cement kilns at home and abroad. Which has already obtained the national invention patent. Magnesia ferrite spinel brick was successfully developed in the year of 2005, which has already been widely used in the firing zone of 5000d/t cement kilns at home and abroad and warmly. Warmly welcomed by the customers.

Magnesia Iron Spinel Refractory Brick Introduction

Magnesia-iron spinel bricks use high-purity magnesia sand and Al-Fe spinel sand as the main raw materials through reasonable proportioning, high-pressure molding, strictly control over the firing temperature and firing atmosphere to make the products have good flexibility and thermal shock stability, and no hexavalent chromium pollution for cement kiln burning zone. The product is high volume stability, high load softening temperature, excellent thermal shock, sticking kiln coating properties and erosion resistance exceeding high quality magnesia-chrome brick, and have small reaction to cement clinker, the impact of the kiln skin off far less than magnesia-chrome brick. Proved by the usage, they not only have long life, smooth debris surface, and also no hazards of chromium.

Magnesia Iron Spinel Refractory Brick Technique Data

item Magnesia-iron spinel brick High toughness magnesia-iron spinel brick
MgO% ≥ 85 88
Fe2O3% 5-7.5 5/6
SiO2% ≤ 2 1.5
Al2O3% ≤ 3.0-5.0 4.0-7.0
Apparent porosity%≥ 17 16
volume density g/cm3 ≥ 3 2.9
cold compressive strength Mpa ≥ 45 55
0.2MPa refractoriness under load, ℃ ≥ 1600 1650
Thermal shock stability(1100℃~water cooling), times                                                   ≥ 6 8
Thermal conductivity W/MK ≤ 2.6 2.6
Thermal expansion % (1400℃)≤ 1.6 1.7

Magnesia Iron Spinel Refractory Brick Advantages

1. Excellent adhering coating performance
2. Low thermal conductivity （1000℃，27w/m·k）, small thermal expansion coefficient（1000℃，1..217%）
3. Excellent structural flexibility, strong penetration resistance and anti-erosion to alkali salt content of K2SO4、Na2SO4、NaCl、KCl decomposed by cement material.
4. High refractoriness under load, excellent thermal shock resistance, used in key parts of sp kilns and NSP kilns with high temperature ,fast speed, strong anti-erosion and great mechanical load.

Magnesia Iron Spinel Refractory Brick Application

Magnesia ferrite spinel brick mainly used in the cement rotary kiln sintering zone.

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Jun 30, 2021
Magnesia Alumina Spinel Brick

Magnesium Aluminum Spinel Brick Introduction

Magnesia Alumina Spinel Bricks are classified into ordinary models and high-quality models according to raw material grades. RS brand magnesia alumina spinel bricks adopt high purity fused magnesia and spinel as main raw materials, their main crystalline phases are periclase and spinel, so they are also called periclase spinel bricks. Magnesia Alumina Spinel Bricks have very good high-temperature performance. Impurity content, especially CaO content, is very low in magnesia alumina spinel bricks.

Magnesia-Alumina Spinel Brick is in order to improve the heat stability of magnesia brick, add alumina oxide in ingredient to generate the magnesia brick which the main material is magnesia-alumina spinel. The advantage of magnesia-alumina spinel brick: good heat stability, in the process of use, it will have a reaction with clinker and produce a thin layer of calcium aluminate maskant, which makes the liquid not easy to penetrate, its anti-stripping performance is better than the directly bonded magnesia chrome brick.

Magnesia Alumina Spinel Bricks advantages

Good thermal shock resistance
High hot mechanical strength
High refractoriness under load
Excellent alkaline slag corrosion resistance

Magnesia Alumina Spinel Brick Physiochemical Index

Item Type-1 Type-2 Type-3 Type-4
MgO % 84 83 86 85
Al2O3 % 13.5 13.0 11.5 11.0
CaO % 1.1 1.2 1.1 1.2
Fe2O3 % 0.7 1.0 0.7 1.1
Apparent porosity % 17 17 17 17
Bulk density g/cm3 2.94 2.94 2.94 2.94
Crushing strength Mpa 60 55 60 55
Refractoriness under load ℃ 1700 1680 1700 1680
Thermal shock resistance /times(1100℃, water cooling) 10 5~10 10 5~10

Magnesia Alumina Spinel Bricks Applications

The main applications of magnesia alumina spinel bricks are rotary cement kilns, glass kiln checker-work, iron mixing furnaces, refractory material sintering kilns, and so on. Compared with magnesia chrome bricks, magnesia alumina spinel bricks have stronger alkaline vapor corrosion resistance, better free SOx corrosion resistance, better oxidization-reduction atmosphere change resistance, etc.

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Jun 30, 2021
Corundum Mullite Bricks

The characteristics of Corundum Mullite Bricks:

1. Low bulk density, low thermal conductivity, good thermal insulation performance.
2. Refractory category allow direct contact of fire, suitable ofr various atmosphere
3. Good integrity with furnace lining, long service life, easy operation, could be shaped freely
4. Product specification: standard form, normal standard, shaped and special shaped bricks.
5. Can be used in various kilns because of its cheapness and general tray package. Among all of the refractory materials, it is the most widely used.

Technical Data of Corundum Mullite Bricks

Performance and application              Corundum-mullite brick
Al2O3 %           80                                     ≥86
Bulk density g/cm3 ≥2.75 ≥2.90
Cold Crushing Strength Mpa ≥60 ≥80
Refractoriness under load °C ≥1700 ≥1700
Liner Change on Reheating% ±0.2(1600°C*2h) ±0.2(1600°C*2h)
Thermal shock stability  (water-cooling)frequency 1100 °C ≥20 ≥20
Coefficient of thermal expansion

*10-6/°C

 4.8-7.6 5.0-8.0
Max application temperature °C 1700
Application Used for the inner liner of the high-temperature kiln, the shed bar of kiln car, etc. Used for the inner liner of the high-temperature kiln, pusher plate of electronic magnetic material

The Application of Corundum Mullite Bricks:

1.Metallurgy industry
2.Heat treatment furnace
3.Chemical industry
4.Steel, non-ferrous smelting furnace
5.Boiler and waste incinerator
6.Coke oven
7.Blast furnace

Zhengzhou Rongsheng Kiln Refractory Co. Ltd. has more than 20 years of history in the production of refractory materials. Our company is mainly engaged in the production of shaped refractories, unshaped refractories, thermal insulation materials. Now, we have established cooperative relationships with many R&D units, and our products have been sold to Japan, Korea, New Zealand, Indonesia, South Africa, Pakistan, Nigeria, Kazakhstan, etc.

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Jun 30, 2021
Fused Mullite Bricks

Fused Cast Mullite Bricks Properties

Excellent thermal shock resistance can resist drastic temperature change.
Excellent abrasion resistance is suitable for high-temperature wearing parts.
Excellent permeation and chemical corrosion resistance.
Low thermal expansion rate, masonry has good structural stability.
High hot mechanical strength, can support a large load.

Fused Cast Mullite Bricks Physiochemical Indexes

Item RZMZ-1 RZMZ-2 RZMZ-3 RZMZ-4
Al2O3 % 70~75 76.17 73.5~76 73.1
SiO2 % 18~21 19.33 22~26 19
Fe2O3 % 2.5~4 1.8 0.1 0.6
TiO2 % 3.0~4.5 2.91 0.05 0.30
Refractoriness ℃ 1790 1790 1790 1790
Bulk density g/cm3 3.00~3.20 3.20 3.20 3.20
Apparent porosity % 1~3 0.5~1.0 / /
Crushing strength MPa >300 176~317 >176 ≥123

Fused Cast Mullite Bricks Application

Fused cast mullite bricks are mainly used at high-temperature parts of smelting furnaces, where suffer severe abrasion and chemical corrosion, such as sliding rail bricks of metallurgical Pusher-type heating furnace, walking-type heating furnace tapping platform (tapping spout) and garbage incinerator lining, etc.

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Jun 30, 2021
Fused Corundum Bricks

Fused Corundum Brick Classification

Fused Corundum Refractory Brick includes two types of Sintered Corundum Brick and Fused Cast Corundum Brick. Sintered Corundum Brick adopts sintered alumina as the raw material through the sintering process. Fused Cast AZS Brick can be made of fused alumina as the raw refractory material through the process method of sintering And also can use phosphoric acid or other adhesive to make Unburnt Corundum Fire Brick.

Corundum Brick Manufacturing Process

Refractory Fused Corundum Bricks include Fused Cast Corundum Brick, Fused Alumina Corundum Brick, and Sintered Corundum Brick. Fused Cast Corundum Brick is manufactured with commercial alumina and little sodium carbonate and quartz powder fusing in the quartz powder and through the process of casting and annealing, and then form the shape and size through machining. Fused Alumina Corundum Brick is made of fused alumina particle and fines adding little fire clay and binding agent through molding by fire brick machine after mulling. The density of fire brick is about 2.75~2.85g/cm3. After drying the refractory bricks are fired at a temperature of 1700~1800℃.

Fused Corundum Bricks Specifications

Item Fused Cast Alumina Fused Cast Alumina Fused Cast Alumina
a-b Alumina RS-M a-Alumina RS-A b-Alumina  RS-H
Chemical Composition Al2O3 94 98.5 93
SiO2 1 0.4 –
NaO2 4 0.9 6.5
Other oxides 1 0.2 0.5
Crystallograghic
Analysis %		 a-Al2O3 44 90 –
Vitreous 55 4 99
Vitreous Phase 1 6 1

Application of Fused Corundum Brick

1.Blast Furnace
2.Hot Blast Stove
3.Refining Furnace
4.Glass Furnace
5.Petrochemical Industrial Furnaces
6.All kinds of high-temperature kiln lining in the metallurgical industry

 

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Jun 30, 2021
Chrome Corundum Bricks

Chrome Corundum Bricks Physiochemical Index

Item GGZ-60 GGZ-30 GGZ-12
Cr2O3 % ≥60 ≥30 ≥12
Al2O3 % ≤38 ≤68 ≤80
Fe2O3 % ≤0.2 ≤0.2 ≤0.5
Apparent porosity % ≤14 ≤16 ≤18
Bulk density g/cm3 ≥3.63 ≥3.53 ≥3.3
Cold Crushing Strength Mpa ≥130 ≥130 ≥120
Refractoriness under load (0.2MPa,0.6%) ℃ ≥1700 ≥1700 ≥1700
Reheating linear change rate(1600℃×3h) % ±0.2 ±0.2 ±0.2

RS company produces various grades of Cr2O3 corundum bricks, which can different application requirements. By production carts, chrome corundum bricks are classified into fused chrome corundum bricks and fired chrome corundum bricks. By Cr2O3 content, chrome corundum bricks are classified into 12# chrome corundum bricks, 30#chrome corundum bricks, 60# chrome corundum bricks, and so on.
Chrome corundum bricks produced by RS company are exported to many countries in the last 10 years, and the application performance is proved to be reliable. No matter what quality standard you have, our experienced engineers can design corresponding products to meet it. We once produced 120T chrome corundum bricks for South Africa customers in 10 days, and the goods are delivered in 13 days, including third-party inspection time.

Chrome Corundum Bricks Application

Chrome corundum bricks have a much longer life than corundum bricks when they are used in steel ladles and carbon black reaction furnaces. Due to the good abrasion resistance of Cr2O3-Al2O3 bricks, they are widely used in the nonferrous metals smelting industry. Chrome corundum bricks are also used in fertilizer factory gasifying furnace lining, their thermal shock resistance and corrosion resistance are very good. Chrome corundum bricks produced by metal chromium slag are widely used in zinc smelting electric furnaces and volatilizing kilns.

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