Bonded Again Fused Cast Alumina Block

Bonded again fused cast alumina block is a type of bonded again sintered refractories brick made of fused corundum clinker as the granular material and fused corundum or sintered

corundum powder as the matrix.

The batching of granular materials should be according to the principles of tightly packing, multilevel ratio, refractory company less intermediate particles and more fine powder. This can improve

the density and sintering of the products. The additives include aluminum phosphate, phosphoric acid, aluminum chromium phosphate, cellulose and pulp waste solution. Among them,

he most promising is active phosphate. Recently, ammonium phosphate is on the trial and achieves good magnesia carbon brick results. The mud should be mixed evenly with a moisture content of 3-4%.

After high pressure molding, high dense bricks are obtained.

There are a few harmful ingredients in the corundum which will cause poor sintering or cracking, firebrick refractory sale so corundum should be pre-calcined before use. The residual ferro-silicon alloy

is oxidized and decomposed into Fe2O3 and SiO2 at 500-1000℃ and Ti in the minerals can be oxidized into TiO2 (rutile), which can cause large volume expansion. After pre-

calcining, the stress caused by those decomposition reactions and oxidation reactions can be eliminated during the pre-calcining process and cracks caused by the volume

expansion of those impurities can be avoided during the sintering process.
Fused corundum block has large volume, so it should be smashed with drop hammers and other ways and then high insulating brick pulverized. The pulverized fused corundum is stored by size after

screened. Fused corundum is hard and difficult to grind. Therefore it is wet ground by ball mills or vibration ball mills. The grain size can be less than 40μm or even 10μm.

The iron in the granular material can be removed with electromagnets and the iron in the fine powder can be washed with acids.


When using fused brown corundum or white corundum as raw materials, the frits should be smashed and then processed by removing the ferro-silicon alloy and other impurities.

White corundum should be processed by removing the flaky sodium aluminate crystals and other low-melting substances. The impurities are easy to be identified since they have low

density and float in the surface of corundum frits.

The fused cast alumina block has high purity. It is difficult to sintere and should be sintered at 1800℃. The type of the kilns used depends on the production scale. For small

batch production, high-temperature batch kiln is better. For batch stable production, the small high-temperature tunnel kiln is used.

Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory

brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more

than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

Refractories for cement industry

calcium silicate product is used in industries including steel plants, cement clinker kiln, heat and power stations, foundries both ferrous and non-ferrous, cement producers, Aleris , ceramics, coke plants, incinerators, renewable energy, chemical works, sugar refineries and petrochemical industry. It is sell well in the world and we won a lot of trust both at home and abroad .

Alkaline Refractories
Alkaline refractory material is available for high temperature calcination, also has superior chemical resistance property, which is a main refractory material for cement kiln to keep high production quality, high yield, low consumption and long-term safe operation. Currently main material for cement kilns include direct-bonded magnesia chrome brick, semi-direct bonded magnesia chrome brick, ordinary magnesia chrome brick , dolomite brick, zirconium and zirconium-free special magnesite brick, spinel brick and chemically bonded unburned magnesia chrome brick.

Bricks properties are listed as follows:

High alumina brickHigh alumina brick has high compressive high insulating brick strength, high refractoriness under load and good thermal shock resistance. Because of its low cost with high quality, it is widely used in varieties of cement kilns. When to be used in arch crown, calcined alumina brick is better. High alumina bricks suitable for cement kilns include phosphate bonded alumina brick, phosphate bonded high alumina wear-resistant brick, anti-stripping alumina brick, chemically bound (special) castable refractory material alumina brick and general alumina brick and so on.

Alkali Brick Series
Alkali brick has excellent alkali corrosion performance, under certain conditions, it will react with the alkali compound kiln materials and kiln gas, rapidl. yclay insulating bricks forming enclosed type dense protective enamel layer on the turn, preventing the continuing internal mixing and bricks "base crack ", which is a indispensable kiln lining material in NSP kiln. This series bricks include ordinary alkali-resistant brick, high-strength alkali-resistant brick, insulation alkali-resistant brick and arch type alkali-resistant brick.

Series refractory castables
Refractory castables can be produced with simple production process, which is flexible and convenient to be used in the cement kiln system. It has become increasingly common to be applied in the complex structure of cement kiln preheater system. Refractory castables suitable for cement kiln mainly include corundum castable, high alumina castable, alkali-resistant castables and light weight castable.

article source:

Refractories for cement industry

nest article:

Several features of refractory lining for EAF

Molding methods of refractories and widely used refractories

Good abrasion resistance, good thermal shock stability, high temperature strength, good erosion resistance.It is widely used in Blast furnace tuyere, the circumference of the tube outlet, mixed air entrance, flue gas pipeline, turning tube etc..

There are many refractory material molding methods, such as common molding method, vibration extrusion method, extrusion method, pounding method and so on.

At present, when it comes to the production of firebrick refractory  materials, the most frequent way of molding refractory material is machine pressure molding method which is a way using brick molding machine and mold to compress the clay material into body. because the clay contains 5% water it is called semi-dry molding method. Machine molding is with compact structure, high strength, narrow drying and firing way, and size is also easy to control.castable  It can be divided into the single side pressure, and double sides pressure which can reduce the phenomenon of layer density.

refractory company The common refractory material are AZS brick, corundum brick, magnesite chrome brick, directly silica carbide, silicon carborundum brick, nitrides, silicides, sulfide, boride, carbide and other non oxide refractories materials; Calcium oxide, chromium oxide, aluminum oxide, magnesium oxide and so on..

Article source:

Molding methods of refractories and widely used refractories

Nest article:

Function and application of Refractory long nozzle

Application of monolithic refractories on industrial furnaces

This product enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance.

Unshaped refractory material is a supporting material for building furnace, which can be divided into two categories: ramming material and casting material. They are widely applied on industrial furnace, mainly used in the furnace bottom portion, inconvenient construction part and masonry part of cooling element.

There are varieties of monolithic refractories, but the specific application on the flash furnace can be divided into four broad categories according to the chemical composition, such as magnesium chrome material, magnesium material, high alumina and clay. Structure of Flash Furnace is more complex, which need moremonolithic refractories, the selection of material is based on using position, such as magnesium chromium castables is used on H-beam part, the connecting part can be built with magnesium chromium castable, magnesia castable or high purity alumina castable; in general part of the furnace, the magnesium chrome castables or magnesia castables are available according to the wall structure, in these areas, it requires better mobility. At the bottom of the furnace, magnesium chromium ramming mass is available to be used under the magnesium-chrome brick layer, clay ramming mass is to be used under clay bricks layer.

Article resourse:

Application of monolithic refractories on industrial furnaces

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Introduction of Changxing Refractory self-flow castable

Improvement of structure and refractories in annealing furnace

Mainly composed of special level bauxite chamotte as starting material and assisted with special additives, the brick are processed by moulding under high pressure and sintering under high temperature, with features like large heat accumulating capacity and small creep rate. 

Annealing furnace of conventional construction will cause oil waste, air pollution, thus the furnace will ladle refractory be damaged, affecting the normal production. The main reasons are as following:
(1) structure is not reasonable. The lining adopts heavy high alumina refractories brick, and hanging off the roof of the structure, and the car door seal is not good, it will cause long time heating, refractory castable poor insulation, bad heat storage. When the workpiece is heated, much of the heat from the furnace inhaling energy increases, leading to severe heat loss.
(2) poor sealing. The old equipment’s oven door must be open in order to work properly if the furnace is heated to 600 ℃, causing the flame to break the door and severe heat loss.
(3) poor combustion conditions. Due to incomplete combustion, when the door closed, it will be easy to plug, so that the furnace increased fuel consumption.

2 rehabilitation programs
Since the annealing furnace structure can not be changed to a great extent, the choice of high-temperature Changxing alumino silicate refractory ceramic fiber feltfolded block and a new fuel spray combustion technology for system transformation are adopted.

2.1 removed the original panel and furnace burners on both sides of the shell plate, using A3, S = 30mm, S = 8mm steel, and L100 × L100 × angle iron welded reinforcement.

2.2 removed the original high alumina refractory brick for sale lining and use the new energy-saving Changxing alumino silicate refractory ceramic fiber folded block, which is fixed to the furnace wall plus welding folding fibers collapse block with stainless steel fasteners for installation, its performance has anti-oxidation, heat storage, good insulation, heat loss, easy maintenance, energy saving compared with the refractory lining in the 20-30%.

2.3 Removed the original top heavy high alumina bricks and demolition angle, instead of new energy-saving high-temperature ceramic fiber folding block.

2.5 reinforced door. Surround the door by L100 × L100 × 10 angle steel reinforcement, installed new energy-efficient furnace door Changxing alumino silicate refractory ceramic fiber collapse block.

Introduction of Changxing Refractory self-flow castable

According to the solid theory and the actual service condition of refractory material, Changxing Refractory developed the high-tech self-flow castables after a series of test. Without vibration, self-flow castables can be degassed and leveled by gravity and thereby become compact.
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The application of different kinds of refractory materials

Ceramic Fiber Paper

Introduction

1.Building material industry,kiln,heating equipment and the inwall of high-temperature pipe line2.Chemical industrial high temperature of reaction equipment inwall3.Power plant ,gas turbine engine and heat insulation of unclear power4.The fire proof of high-rise building5.Used to make gasket6.High-temperature filter material

Acidic refractories
A larger ladle refractory amount of silica brick and clay. Brick containing more than 93% SiO2 siliceous products, raw materials used are silica, silica brick and other waste. Brick acid-resistant slag erosion ability, but are vulnerable to erosion of basic slag, its high load softening temperature, close to its refractoriness, the volume does not shrink after repeated firing, and even a slight expansion, but anti-refractory abrasive
Poor thermal shock resistance. Mainly used for coke oven silica brick, glass melting furnaces, steel furnaces and other acidic thermal equipment. Bricks containing 30% to 46% alumina, refractory castable refractory clay it as the main raw material, refractoriness 1580 ~ 1770 ℃, thermal shock resistance, weak acid belongs refractory to acid slag have corrosion resistance, widely used, The current production capacity is the largest category of refractories.

Neutral refractory
High aluminum products in the main crystal phase is mullite and corundum, corundum content increases with increasing alumina content and containing more than 95% of refractory company alumina corundum products is a wider use of high-quality refractory materials. Chrome brick mainly chrome ore as raw material, the main phase is chromite. It slag corrosion resistance, but poor thermal shock resistance, high temperature load deformation temperature is low. Chrome ore and magnesite in different proportions of chrome magnesia brick made good thermal shock resistance, mainly used for basic flat roof tiles. Carbonaceous products are another neutral refractories, according to the carbonaceous feedstock composition and mineral products, divided into carbon bricks, graphite products and silicon carbide products categories. Carbon brick with high-grade petroleum coke as feedstock, plus tar, bitumen as a binder, at 1300 ℃ firing isolation under atmospheric conditions. Graphite products (except natural graphite outside) by 2500 ~ 2800 ℃ graphitized carbonaceous material obtained in an electric furnace. Places carbide silicon carbide products as raw materials, plus clays, binders such as silica calcined at 1350 ~ 1400 ℃. Silicon carbide can also be added to the silicon powder in an electric furnace under a nitrogen atmosphere castable is made of silicon nitride - silicon carbide products. Refractory Abrasives coefficient of thermal expansion of the low carbon products, high thermal conductivity, good thermal shock resistance, high temperature strength. fire bricks Long-term use at high temperatures do not soften, without any acid-base erosion, good salt tolerance, but also from metal and slag wetting, lightweight, high-quality refractory materials. The disadvantage is easily oxidized at high temperatures, it should not be used in an oxidizing atmosphere. Carbonaceous products are widely used in high temperature furnace lining (hearth, hearth, the lower part of the furnace body, etc.), non-ferrous metal smelting furnace lining. Graphite products can do the reaction vessel and petrochemical lined autoclave. Silicon carbide and graphite products can also be made with gold and copper smelting crucible with light alloy.

Basic Refractories
With magnesium products as a representative. It contains magnesium more than 80% to 85%, based on periclase main crystal phase. The main raw materials to produce magnesia brick of magnesite, seawater magnesia extracted from the sea by high temperature calcination of magnesium hydroxide) and the like. Alkaline slag and iron slag has good resistance. Polycrystalline mullite fiber melting point of pure magnesium oxide up 2800 ℃, therefore, magnesia brick refractoriness than the clay bricks and brick are high. Since the mid-1950s, the use of open hearth furnace and basic oxygen converter steel roof, basic refractories production increasing adoption, clay and silica brick production is declining. Basic Refractories mainly used open hearth, oxygen converter, electric furnace, non-ferrous metal smelting as well as some high-temperature thermal equipment.

The difference between ceramic fiber paper and ceramic fiber cloth

Ceramic fiber paper and ceramic fiber cloth are refractory insulation materials, can be used to heat insulation, how to better distinguish between ceramic fiber paper and

1.Building material industry,kiln,heating equipment and the inwall of high-temperature pipe line2.Chemical industrial high temperature of reaction equipment inwall3.Power plant ,gas turbine engine and heat insulation of unclear power4.The fire proof of high-rise building5.Used to make gasket6.High-temperature filter material

ceramic fiber cloth, according to the accumulation and experience, can be in several aspects to distinguish:

1 appearance. ceramic fiber felt cloth has a clear grid like, ceramic fiber paper is very little, and even no grid.
2 density. Ceramic fiber paper is greater than the density of ceramic fiber cloth.
3 thickness. Ceramic fiber paper high insulating brick is the most thin can be done 0.5mm, ceramic fiber paper can not do so thin, generally the most thin also has 2mm.
4 stand. Ceramic fiber paper can be like in our life that can be placed on the A4 paper, mold, stand up. refractory company Ceramic fiber cloth is like our life with cloth, very soft, does not

have to stand.
5 tear resistance. The toughness of ceramic fiber paper is not good with ceramic fiber cloth.

Whycic fiber module is widely applied in furnace

Ceramic fiber module is lighter than light weight insulation brick and can reduce the load of the furnace. It has lower heat capacity which means less heat absorbed by the

The construction is convenient, high strength, low thermal conductivity, good thermal insulation effect.

furnace in the reciprocal Clay, High Alumina insulating bricks operation and faster heating. It has white color and regular size and can be fixed directly to the industrial furnace.

Ceramic fiber magnesia carbon brick module has excellent chemical stability, thermal stability and flexibility. It is in pre-compressed state. After masonry is completed and the banding is lifted,

the expansion of ladle gunning mix ceramic fiber module can make the lining seamless and compensate the shrinkage of the lining, which can improve the thermal insulation and the integrity of the

furnace. The lining requires no drying and maintenance and can be used directly.

Technological characteristics of mullite brick

High strength, high temperature stability is good, the creep rate is small.

Plasticity of fireclay bricks and concluded by its split decisions, and plasticity in close relationship with the conclusion. In most situations, strong plasticity, which are also strong.

So produced are usually entered into as malleable to arbitrate its functional strength, plasticity and in accordance with the established ratio of injection molding process and the conclusion of agent, executive producer of all kinds of refractory products. Sintering of the refractory magnesia carbon brick is the calcination of fireclay bricks can be function of the density and intensity, regardless of the conclusion of clay bricks on burning clinker using rigid High-alumina clay bricks and clay tiles, is a key process attributes.

Technological characteristics of mullite brick important apart, plasticity, conclusion and sintering. These properties directly influence its function as a refractory. Fireclay bricks apart is its amount of micro-particle content so soft clay brick is a kind of broken up objects, while other fireclay bricks apart by grinding after crushing degree.
Henan Xinmi Changxing Refractory material Co., Ltd. our product portfolio covers shaped products such as refractory material, firebrick refractory sale, refractory castable, refractory nozzle, ceramic fiber,slide gate, etc;

high aluminum bricks and unshaped refractory materials

Mainly composed of special level bauxite chamotte as starting material and assisted with special additives, the brick are processed by moulding under high pressure and sintering under high temperature, with features like large heat accumulating capacity and small creep rate. They are avail able for blast hot stove matched of middle and small blast furnace.

High aluminum brick construction technology and equipment, coupled with gravity, innovation pumping and injection casting material, more simple, more reliable construction technology has slide gate fire clay provided favorable conditions. In order to realize the full automation of the construction process control computer and construction process, to promote "the research and development of gradient or multilayer castable". "Gradient castables" refers to the uncertainty from the hot side Ladle Permeable Brick to cold is lining castables gradually by the change of structure and thermal properties of matrix components, consisting of several layers. This will more adapt to the lining of actual conditions of use, may go to better use of results.

The unshaped refractory materials in monoblock stopper Chinese accounted for only about 15%, is expected in recent years can be increased to 30%-40%. should be committed to the development of a better high temperature properties of AL2O3 based and MgO based no cement castable. Selective binding system more suitable; the introduction of non oxide; from the angle of economy and technology feasibility study into the nano powder on the quality of unshaped refractory materials.

Henan Xinmi Changxing Refractory material Co., Ltd. our product portfolio covers shaped products such as refractory material, refractory brick, refractory castable, refractory nozzle, ceramic fiber,slide gate, etc;

China Mullite brick with good thermal insulation

Composed of compound mullite, the bricks are processed through moulding under high pressure and sintering at high temperature, with Features of strong strength, steady bulk at high temperature and small creep rate, which are available for hot blast stove of large and middle size.

Preparation of Zircon mullite brick with high porosity porous materials, light weight, low thermal conductivity, high permeability, the advantages of non-brittle, with a wide range of applications, chemical industry, metallurgy, environmental protection and other fields of application will be of great social and economic importance.

Mullite brick with high ladle refractory temperature resistance, high strength and high thermal conductivity coefficient, energy saving features such as stove suitable for petroleum cracking furnaces, metallurgy, ceramics roller kiln, tunnel kiln, drawer kiln, glass electric porcelain Crucible Furnace and furnace linings, direct contact with the flame, the technical supervision departments concerned testing and use of products meet specifications of similar foreign products.


refractory company Henan Xinmi Changxing Refractory material Co., Ltd. our product portfolio covers shaped products such as refractory material, refractory brick, refractory castable, refractory nozzle, ceramic fiber,slide gate, etc;

High purity corundum bricks corrosion resistance performance

The products are produced by corundum and chromium oxide as main materials, formed from casting, after being treated under high temperature, it has high hot strength and good wear resistance, suitable for making the slide rail part of heating furnace.

Plate-corundum has been widely used in refractory brick for sale the production of high performance refractories for steelmaking, has long used in non-steel industry, such as gasification furnaces and other industrial furnaces and other high-purity fused corundum brick raw material used by mainly white fused corundum. Often seen as white fused corundum high bulk density can increase the density of products and its corrosion resistance performance is good, you can improve the performance of products.

White fused alumina corundum is the preparation of high purity corundum brick slab are two main raw material impurities (such as SiO2) content is low, the volume density is high, thermodynamic properties, and alumina brick can resist gasification furnaces and other industry furnaces running caused by thermal, chemical structures. White fused alumina and fused alumina production process is different, is different, properties of corundum brick and their usage has some differences.

Due to its excellent firebrick refractory corrosion resistance, abrasion resistance and high temperature strength, refractoriness, creep, thermal and mechanical properties, is widely used as a residual oil Gasifier, gas furnace, carbon black, pulp waste gasification reaction furnace lining of furnaces and other industry furnaces.

Henan Xinmi Changxing Refractory material Co., Ltd. our product portfolio covers shaped products such as refractory material, refractory brick, refractory castable, refractory nozzle, ceramic fiber,slide gate, etc;