Rongsheng Refractory Factory

Category: Products

  • Ladle Well Block

    In modern metallurgical process, air blowing smelting technique is adopted, steel ladle purging plug pocket blocks are an important functional component for this step, steel ladle purging plug pocket blocks should have the following characteristics:

    1. High temperature erosion resistance
    Refinery steel ladle requires very strict standards on smelting temperature and time, the max. temperature can reach to more than 1750℃. During refinery process, molten slag alkalinity has great influence on refractory materials’ service life. Steel ladle refinery slag’s alkalinity varies between 0.6~0.4, so refractory material will suffer the erosion of acid slag and basic slag which have high permeability at high temperature, and has a quick damage speed.
    2. High temperature abrasion resistance
    All kinds of steel ladle refinery methods all adopt compulsory stirring, which will cause severe high temperature abrasion to pocket bricks.
    3. Spalling resistance
    Because of intermittent operation, temperature fluctuation is very large, which easily generate thermal spalling and structural spalling, working condition is very harsh. So currently used steel ladle purging plug pocket bricks’ performance such as high temperature erosion resistance and spalling resistance should be improved.

    Steel Ladle Pocket Bricks Application

    Steel ladle purging plug can be divided into built-in type integral purging plug and externally fitted purging plug combination type. To prolong purging plug’s service life, enhance it’s safety coefficient and ensure no steel leaking and permeation, no matter for externally fitted purging plug or built-in purging plug, pocket bricks play and important role and should be carefully chosen.

    Pocket bricks are mainly used for continuous casting tundish and matched with nozzle bricks. Pocket bricks have high etching resistance, won’t distort or crack when coupled with zirconia metering nozzle.

  • Purging Plug Bricks

    As air supply component is important functional refractory material of steel smelting, different materials and structures of air supply bricks can be used for different smelting vessels and operation conditions. There are mainly two kinds of purging plug bricks now: one is converter and electric furnace purging plug, the other is steel ladle purging plug brick. They are significantly different in working condition, using requirements, so the materials, structure and manufacturing crafts of them are different.

    Converter And Electric Furnace Purging Plug

    Converter bottom blowing gas supply component is important refractory material for top and bottom combined blowing craft, it plays an important role in smelting process. Top and bottom combined blowing converter’s gas supply component is magnesia carbon purging plug, which is installed at converter bottom. Currently, mainly used converter purging plug is isostatic pressing molded magnesia carbon air supply brick. This kind of purging plug brick has small expansion coefficient, good spalling resistance and long service life.

    Electric furnace bottom blowing air supply components can be divided into two types. One is direct stirring system air supply bricks, which is similar to converter magnesia carbon containing, high pressure formed, sectionally combined air supply bricks. The other is indirect stirring system air supply components. Purging plug won’t contact with steel liquid directly, and air is supplied by surface air permeable ramming mass. Compared with direct stirring air supply component, indirect stirring air supply component’s service life is longer, and requires large flow rate purging plug bricks.

    Converter And Electric Furnace Purging Bricks Index

    Item Converter air supply component UHP air supply component Purging ramming mass
    MgO % 76 81 75
    C % 14 14 /
    CaO % / 1.09 20
    Al2O3 % / 3.0 /
    Fe2O3 % / 0.89 3.5
    Apparent porosity % 4.0 2.93 /
    Bulk density Mpa / 56 /
    Rupture strength Mpa / 23 /
    High temperature rupture strength Mpa(1400℃) 10.0 12.6  
    Air flow rate m3.h-1 20 / /

  • Sillimanite Bricks

    Sillimanite Bricks Production Craft

    Slurry casting method produced sillimanite bricks adopt natural sillimanite, synthesized mullite, high alumina clinker and so on as raw materials. Gypsum mould is made according to products shapes, and slurry used for casting is prepared based on technical parameters. After casting, green sillimanite bricks should be dried before high temperature sintering.

    Sillimanite Bricks Physiochemical Indexes

    Item GXSZ-1 GXSZ-2 GXSZ-3 GXSZ-4
    Al2O3 % 56.4 59.3 64.5 65.5
    Fe2O3 % 0.96 0.80 1.0 0.71
    SiO2 % 39.5 38.1 33.4 31.9
    CaO % 0.28 0.08 / /
    K2O % 0.51 0.24 0.4 0.46
    Bulk density g/cm3 2.36 2.34 2.58 2.32
    Apparent porosity % / 20.8 16.2 21.8
    Refractoriness s under load ℃ / 1620 1650 1570
    Modulus of rupture Mpa / 60 70 /
    Thermal expansion coefficient % / 5.5 6 6.6

    Sillimanite Bricks Applications

    Sillimanite bricks have better physiochemical properties than high alumina bricks, they are mainly used in glass tank furnace throat, blast furnace lining, furnace throat, ceramics industry kiln furniture and so on. As sillimanite bricks have good high temperature thermal stability, good resistance to glass liquid corrosion, low pollution to glass liquid, they are usually used at glass industry feeding canister, feeder, tube drawing machine and other equipment, production efficiency are significantly improved. Sillimanite bricks series products mainly include: feeder bricks, feeding canister, rotating tube, feeder nose, feeder bowl, former block, slag skimmer block, shutter block, front arch bricks, back arch bricks, feeder nose cover, burner nozzle bricks, cover plate and so on.

     

  • Andalusite Bricks

    The grading formulation of andalusite bricks

    Item Granularity Percent
    Andalusite 1~3mm 0~50%
    0.088~1mm 15~25%
    <0.088mm 15~28%
    Mulllite 1~3mm 0~50%
    Flint clay 1~3mm 0~50%
    Synthesized cordierite <0.088mm 0~10%
    Magnesia micro powder   1~3%
    Alumina micro powder   2~8%
    Sooth silica   3~10%
    Water reducer   0.01~0.1%

    Production process of andalusite bricks

    Batch materials of andalusite bricks should be prepared as per formula, then after mixing and tempering, green bricks are made by mold pressing method. Then through drying and high temperature sintering, andalusite bricks are finally produced.

    Andalusite Bricks Physiochemical Indexes

    Item HZSZ-1 HZSZ-2 HZSZ-3
    Al2O3 % ≥ 60 56 52
    Fe2O3 % ≤ 1.0 1.2 1.3
    Refractoriness ℃ >1790 >1790 >1790
    Apparent porosity % ≤ 18 18 20
    Bulk density g/cm3 ≥2.45 ≥2.45 ≥2.45
    Refractoriness  under load (0.2Mpa) ℃  ≥ 1680 1650 1600
    Reheating linear change rate(1500℃, 3h) +0.2~-0.1 +0.2~-0.1 +0.2~-0.1
    Crushing strength Mpa ≥ 50 45 40
    Creep rate % ≤ 0.8 0.8 0.8
    Thermal shock stability (1100℃,water cooling) /times ≥20 ≥20 ≥20

    Andalusite bricks applications

    Andalusite bricks are premium refractory bricks with very good high temperature performance, such as wearing resistance, thermal shock resistance, excellent volume stability and strong corrosion resistance. In glass furnaces, andalusite bricks are a good replacement of sillimanite bricks. The main applications of andalusite bricks in float glass furnaces are tin bath roof cover, domestic and special glass kiln forehearth, feeder, tube drawing machine and other equipment. Andalusite bricks are also widely used in blast furnaces and hot blast furnaces, torpedo tank and so on.

  • Acid Resistant Bricks

    The Properties of Acid Resistant Brick

    1. Can form corrosion resistant material during production.
    2. Good acid and alkali corrosion resistance.
    3. Low water absorption rate.
    4. Good oxidization resistance at room temperature.

    Acid Resistant Brick Physicochemical Index

    Item Index
    SiO2 69.8%
    Al2O3 22.5%
    K2O 2.7%
    Na2O 0.95%
    CaO 0.82%
    MgO 0.12%
    FeO 0.49%
    Acid fastness 99.86
    Bulk density 2.31~2.4g/cm3
    Water absorption ≤2.0%
    Modulus of rupture ≥58.8Mpa
    Crushing strength ≥120Mpa

    Lightweight Acid Resistant Brick Physiochemical Indexes

    Index Special acid-proof brick Lightweight acid-proof brick
    SiO2(%) ≥ 65 65
    Bulk Density(g/m³) 1.6-1.8 1.0-1.3
    Cold Crushing Strength(Mpa) ≥ 15 10
    Thermal Conductivity(W/m.k)  ≤ 0.65 0.45
    Water Absorption(%)  ≤ 15 working face 5
    Acid-proof rate(%)  ≤ 98 97
    Service temperature( ℃)  ≤ 1000 1000

    The Application of Acid Resistant Bricks

    Acid resistant bricks are widely used in petrol industry, chemical industry, metallurgy, power plant, chemical fiber, paper industry, pharmacy, fertilizer, food, galvanization factory, as well as acid tower, tank, bath, groove and other corrosion resistant projects. Acid resistant porcelain bricks are also used at sewage pipe and outdoor grounds.

    Lightweight acid resistant bricks are mainly used at acidic atmosphere which suffers acidic gases corrosion, such as CFB boiler chimney, coking oven chimney and flue, etc. Lightweight acid resistant bricks should not contact with acidic liquid directly.

    We specialize in refractory products for nearly 20 years, covering a full range of Graphite Electrode, High Alumina Bricks, Sillica Bricks, Fused AZS 33/36/41 Bricks, Mullite JM 23/26/28/30 Bricks, Magnesia Bricks, Magnesia Chrome Bricks, Magnesia Carbon Bricks, SiC Bricks, Dense and Light Weight Insulaing Castables and other related products for more sophisticated applications.

  • Alkali Resistant Bricks

    Alkali resistant bricks properties

    Excellent resistance to alkali corrosion.
    Long service life.
    Low porosity.
    High hot strength.
    Good thermal shock resistance.
    Good abrasion resistance.

    Alkali resistant bricks physiochemical indexes

    Item RSRK-35 RSRA-40T
    Al2O3 % 35~45 38~42
    SiO2 % 50~55 52~56
    Fe2O3 % ≤2 1.5
    Bulk density g/cm3 2.0~2.1 2.2~2.35
    Apparent porosity % ≤16 12~15
    Cold crushing strength MPa ≥60 ≥50
    Refractoriness under load (0.2MPa) ℃ ≥1350 ≥1320
    Thermal shock resistance (950℃, air cooling) /times ≥80 >50

    Alkali resistant bricks applications

    The main application field of alkali resistant bricks is cement kiln. Alkali resistant bricks used in cement kilns are classified into ordinary alkali resistant brick, high strength alkali resistant brick, arch top type alkali resistant brick, insulating alkali resistant brick, etc. High strength alkali proof bricks are mainly used at cement kiln preheater, decomposition furnace, tertiary air duct, vertical ascending flue, cyclone cylindrical part and conic part. Arch top type alkali resistant bricks are mainly used at cement kiln preheater, decomposition furnace tertiary air duct and so on. Alkali resistant insulating bricks are mainly used at cement kiln discharge end, kiln hood, cooler, etc..

    We specialize in refractory products for nearly 20 years, covering a full range of Graphite Electrode, High Alumina Bricks, Sillica Bricks, Fused AZS 33/36/41 Bricks, Mullite JM 23/26/28/30 Bricks, Magnesia Bricks, Magnesia Chrome Bricks, Magnesia Carbon Bricks, SiC Bricks, Dense and Light Weight Insulaing Castables and other related products for more sophisticated applications.