Rongsheng Refractory Factory

Author: zzrsrefractories.com

  • Phosphate Bonded High Alumina Brick

    Phosphate Bonded High Alumina Brick Characteristics

    Compared with ceramics bonded high-alumina bricks, phosphate bonded high alumina bricks have better spalling resistance, but refractoriness under load temperature and corrosion resistance of phosphate bonded high alumina bricks are both lower. So some fused corundum or mullite can be added to raw material to improve corrosion resistance and refractoriness under load temperature.

    phosphate bonded high alumina brick3Phosphate Bonded High Alumina Bricks Technical Index

    Item Phosphate bonded high alumina bricks Alumina phosphate bonded high alumina bricks
    Al2O3 % > 76 78
    Fe2O3 % < 3.2 3.2
    CaO % < 0.6 0.6
    Cold crushing strength Mpa > 65 70
    Bulk density g/cm3 2.65 2.70
    Refractoriness under load ℃ > 1350 1300
    Refractoriness ℃ > 1790 1790

    Phosphate Bonded High Alumina Bricks Application

    Phosphate bonded high alumina bricks adopt 5~10mm bauxite clinker aggregate as main raw material, about 50% phosphate solution as a binder, it has higher porosity, at the same temperature condition, it has a relatively lower modulus of elasticity, as well as better thermals, shock resistance. Phosphate binding high alumina bricks are mainly used for the pre-combustion zone, decomposition zone and kiln door shield of rotary cement kiln, and cooling machine inner linings, where bricks are easy to fall off. Abrasion-resistant high alumina bricks adopt bauxite clinker, less than 5mm as aggregate, aluminum phosphate as a binder, it is more compactly pressed, with high mechanical strength, abrasion resistance, but lower thermal shock resistance. Alumina phosphate bonded high alumina bricks are mainly used at transition zone and sintering zone of middle size and small size dry rotary cement kilns. Phosphate bonded high alumina bricks are also used in electric furnace top, ladles, and so on.

  • Sintered Magnesia Bricks

    Technical Data of magnesia bricks:

    Items Physical and Chemical characters
    M-98 M-97A M-97B M-95A M-95B M-97 M-89
    MgO % ≥ 97.5 97.0 96.5 95.0 94.5 91.0 89.0
    SiO2 % ≤ 1.00 1.20 1.5 2.0 2.5 – –
    CaO %≤ – – – 2.0 2.0 3.0 3.0
    Apparent Porosity   % ≤ 16 16 18 16 18 18 20
    Bulk Density g/cm3 ≥ 3.0 3.0 2.95 2.90 2.85
    Cold Crushing Strength  MPa ≥ 60 60 60 60 50
    0.2Mpa Refractoriness Under Load ℃≥ 1700 1700 1650 1560 1500
    Permanent linear change  % 1650℃×2h  -0.2~0 1650℃×2h -0.3~0 1600℃×2h -0.5~0 1600℃×2h -0.6~0

    Application of Magnesia bricks:

    Magnesia bricks are mainly used for steel-making alkaline open-hearth, electric furnace bottom and wall, oxygen converter lining, non-ferrous metal smelting furnace, high-temperature tunnel kiln, short magnesia brick, and cement rotary kiln lining, furnace bottom and wall of heating furnace, glass Kiln regenerator, etc.

  • Magnesia Chrome Bricks

    Magnesia Chorme Brick Features & Benefits

    1. Low bulk density, low thermal conductivity, good thermal insulation performance.
    2. Refractory category allow direct contact of fire, suitable for 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 Magnesia Chrome Bricks:

    Common Magnesia Chrome Brick

     Items Physical and Chemical characters
    MGe-16A MGe-16B MGe-12A MGe-12B MGe-8A MGe-8B
    MgO % ≥ 60 45 60 55 65 60
    Cr2O3 % ≥ 16 16 12 12 8 8
    Apparent Porosity % ≤ 19 22 19 21 19 21
    Cold Crushing Strength MPa≥ 35 25 35 30 35 30
    Refractoriness Under Load °C≥ 1650 1550 1650 1550 1650 1530

    Direct-Bonded Magnesia Chrome Brick

     Items Physical and Chemical characters
    ZMGe-16A ZMGe-16B ZMGe-12A ZMGe-12B ZMGe-8A ZMGe-8B ZMGe-6
    MgO % ≥ 60 58 68 65 75 70 75
    Cr2O3 % ≥ 16 16 12 12 8 8 6
    SiO2 % 1.5 2.5 1.5 2.5 1.5 2.5 2.5
    Apparent Porosity % ≤ 18 18 18 18 18 18 18
    Cold Crushing Strength MPa ≥ 40 40 45 45 45 45 45
    Refractoriness Under Load °C ≥ 1700 1650 1700 1650 1700 1650 1700

    Fused rebonded Magnesia Chrome Brick

    Items Physical and Chemical characters
    DMGe-26 DMGe-24 DMGe-22 DMGe-20A DMGe-20B DMGe-16A DMGe-16B DMGe-12A DMGe-12B
    MgO % ≥ 50 50 55 58 58 62 58 68 65
    Cr2O3 % ≥ 26 24 22 20 20 16 16 12 12
    SiO2 % 1.5 1.5 1.5 1.5 2.0 1.5 2.0 1.5 2.0
    Apparent Porosity % ≤ 16 16 16 16 17 16 17 16 17
    Cold Crushing Strength MPa ≥ 40 40 40 40 40 40 40 40 40
    Refractoriness Under Load °C ≥ 1700 1700 1700 1700 1700 1700 1700 1700 1700

    Fused semi-rebonded Magnesia Chrome Brick

     Items Physical and Chemical characters
    BMGe-26 BMGe-24 BMGe-22 BMGe-20A BMGe-20B BMGe-

    18

    		 BMGe-16A BMGe-16B BMGe-12A BMGe-12B
    MgO % ≥ 50 50 55 58 55 58 60 55 68 65
    Cr2O3 % ≥ 26 24 22 20 20 18 16 16 12 12
    SiO2 % 2.0 2.0 2.0 2.0 2.5 2.0 2.0 2.5 2.0 2.5
    Apparent Porosity % ≤ 16 16 16 16 16 16 16 17 16 16
    Cold Crushing Strength MPa ≥ 40 40 40 40 35 40 40 35 40 35
    Refractoriness Under Load °C ≥ 1700 1700 1700 1700 1700 1700 1700 1700 1700 1700

    Application of Magnesia Chrome Bricks:

    Magnesia chrome bricks are mainly used in cement rotary kilns, glass kiln regenerators, steelmaking furnace linings, refining steel cladding, non-ferrous metallurgy furnaces, lime kilns, iron mixers and refractory high-temperature furnace linings.

  • Magnesia Carbon Bricks

    Magnesia Carbon bricks are very mature product in our area. As our area has 1/4 world storage of best quality Magnesia ore, we can provide as good quality as European Mg-C bricks with competitive prices. We also provide basic refractory lining solution for CONVERTER, EAF, LF, LADLE, etc. these industrial furnaces.

    Technical Data of Magnesia Carbon Bricks

    Items MC8 MC10 MC12 MC14 MC18
    Apparent porosity% ≤ 5.0 4.0 4.0 3.0 3.0
    Bulk density g/cm3 ≥ 3.00 3.00 2.98 2.95 2.92
    Cold  Crushing Strength  MPa≥ 50 40 40 35 35
    Chemical
    composition%    		 MgO ≥ 84 82 76 76 72
    C ≥ 8 10 12 14 18
    Application General use Corrosion Resistance Extra Corrosion Resistance

    Magnesia Carbon Bricks Applications

    Magnesia carbon bricks are widely used in converters, and their performance is very good, unit refractory consumption is significantly reduced. Besides, MgO-C bricks are also widely used in high power electric furnace wall hot point, secondary refining furnace inner lining, steel ladle slag line and so on. When magnesia carbon bricks are applied in steel ladles, they should not contact with SiO2 containing refractory, or magnesia carbon bricks will have larger molten erosion.

  • 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.

  • 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.