Skills preferred in pig iron refractory using

Xinmi Changxing refractory main products of bottom blowing argon with a series of quick drying pouring material is listed as national torch plan project focus of permeable brick, gun furnace, the skill level of international priority; between the working lining refractory material for ladle, with a series of skateboard outlet, between three large bulky package casting goods has reached international advance level.

Productivity growth is the issue grows the important power. Raised for the project of 100000 tons unshaped refractory, 200000 ventilation bricks, 25000 tons of brick, 10000 tons of silicon nitride silicon carbide brick, concluded 20000 tons slides, 5000 tons casting three pieces are to be 20 at the end of the year completed and put into production, 50000 tons of alumina magnesia carbon brick foresight will be put into operation in 2010 May, after the achievement growth is productivity have put on the important power.

The exchange rate will continue to maintain the hair foreseen before and after 35%. Commodity cost structure, raw materials accounted for 82%, accounting for 4% of human resources, and depreciation accounted for 14%, by raw materials price greater impact. The enterprise commodity wool exchange rate has remained around 40% high, causes include:

First, price inertia causes the price to maintain high, before 2000, the steel mill in refractory simply from foreign entrance, after gradually realize the entrance is replaced, the unit price is still maintained at a high level;

Second, because the inserted steel enterprises need annual certification, after insertion has some monopoly power, high insertion wind barriers, greater responsibilities (such as causing the steel leakage accident must bear the compensation duty) make wool exchange rate to maintain a high level;

Three, refractory material as supplies accounted for only 1% before and after the cost of steel making, steel prices is not sensitive to the price; fourth, enterprises pay attention to innovative products R & D, the majority, but also conform to the user’s skill requirements, unceasingly withdrawal new goods and to mobilize additional value of commodity, have strong pricing ability, thus maintaining a higher gross rate the level of.

New type refractory -magnesia calcium brick

Magnesia calcium brick also called high calcium magnesium brick. In order to periclase as main crystal phase, silicate calcium for three secondary crystalline phase of magnesiarefractories. Containing MgO80% ~ 87%, CaO6% ~ 9%, CaO/SiO2 than in 2.2 ~ 3. The show structural characteristics of periclase and two calcium silicate calcium silicate and three direct contact, eutectic (interstitial 4CaO – Al2O3 – Fe2O3 into veinlets filled in the silicate calcium silicate calcium two and three between. Low porosity. Refractoriness under load was generally higher than 1700 DEG C, good performance of anti alkaline residue. But poor thermal shock resistance. Taking calcium magnesite as raw material, and through crushing, proportioning, mixing, molding, firing at 1550 to 1600 degrees. Can be used for side blown converter steelmaking at eye, open hearth and oxygen converter etc…

Magnesia calcium brick is basic refractory products with MgO and CaO as the main chemical components, including dolomite brick and magnesia dolomite brick. Magnesia calcium brick with excellent performance, especially with purifying molten steel performance is other kind of refractory materials do not possess. Therefore, magnesia calcium brick has been widely used in AOD furnace, VOD furnace and LF furnace refining equipment, and have achieved good results.

Magnesia calcium brick with seven properties, respectively, high temperature resistance, slag corrosion resistance, anti stripping performance, wear resistance, purifying molten properties, hydration resistance.

Along with our country stainless steel and all kinds of clean steel production capacity continues to expand, all kinds of refractories consumption will continue to increase. For better production and use of magnesia calcium brick, for China’s steel industry and other high temperature industrial services, to analyze and discuss the use performance of magnesia calcium brick, with understanding and knowledge of magnesia calcium brick using performance and influence factors is very necessary.

Structure of refractory brick can also cause brick burst

Structure of refractory bricks will burst and its product itself also has the very big relations. Refractory brick thermal spalling, refers to the subject of the refractory brick thermal shock, in refractory brick surface and internal temperature difference, because of differences in thepresence of internal expansion, leading to refractory brick masonry produce stress, when the stress accumulation caused to a certain extent is the heat burst. So, cause the refractory brick thermal spalling reason which to have:

1, silica brick mineral phases such as quartz, tridymite, cristobalite, due to the temperature change and also accompanied by quartz crystal type conversion, volume change, so the heating or cooling brick masonry structure, the need to pay particular attention to the problem of thermal explosion.

2, magnesia brick and magnesia chrome brick, because its thermal expansion coefficient is larger, the thermal decrepitating temperature mutation is also easy to produce refractory brick.

3, insulating refractory brick, because of its low thermal conductivity, the temperature gradient in brick, and because of its relatively low strength, so it is also easy to produce hot crack problems.

As the introduction, is it right? Ofrefractory bricks have a further understanding of it; the content above is only for your reference, the specific reasons but also according to the specific circumstances to determine. More detailed content of http://www.yilongrefractory.com

Selection of additives in firebrick

Resin bonded carbon magnetite brick because of its good thermal shock resistance and slag resistance of iron and steel industry, in particular applied basic oxygen furnace and electric arc furnace. Carbon has excellent performance such as high thermal conductivity, low thermal expansion coefficient, high heat shock stability, at the same time and wettability of the job of slag has good corrosion resistance and anti erosion ability. As is known to all, the brick body carbon easy oxidation, which restrict its use in high temperature, the oxidation of carbon from the beginning of the 300 DEG C, with the increase of temperature oxidation speed.

Ceramic materials (SiC, carbon silicon oxide) do coating in the flake graphite or carbon fiber, were impregnated with phosphate, cement foam board price and the use of surface glaze etc… These expensive methods used in the refractory brick have certain limitations, another method is through the steam treatment of fine particle boron, TiB2, ZrB2 and SiC and other materials to do thermal barrier coating on graphite or carbon composite material.

A common method of refractory brick is to add fine-grained antioxidant materials, such as in MgO C SiC, B4C, brick added metal Al, Mg and (or) Si to prevent or limit carbon at high temperatures (> 1400 C) oxidation. Also, these additives are expensive, and can not completely prevent the oxidation of carbon at low temperature. Coating solution by liquid mixing 60% solid and 40% made, wherein the liquid binder is phosphoric acid and ethanol (liquid solution 30%) mixture. The outer coating brush MgO C brick thickness is about 0.8mm, the sample coating drying at room temperature is about 10min. In practice, the ladle after 5h pre heated to 1200 DEG C, because of some difficulties in the process of steel-making and sometimes need a longer time.

Check method of refractory castable strength

The particle size of castable refractory refers to the particle size, usually expressed in diameter, size, size and shape of the refractory castable composition of great influence on the quality of masonry, today Changxing engineer for everyone to explain granularity inspection method of refractory castable.

The size and composition of the first use of check size sieving method, screening method requires specialized laboratory, is carried out in the laboratory, it can measure the percent composition of various size.

Then check the size shape, size of general shape according to the usual experience, for the eye visual. Check the size strength can be used sticks to beat the breaking even, observation.

Overall, granularity inspection of refractory castable must installation drawings technical requirements to determine, the particle size should not exceed the maximum size, so as not to affect the use. Xinmi Changxing Refractories Co, Ltd. (www.yilongrefractory.com) specializing in the production of various kinds of castable, welcome to buy.

Measures should be adapted to refractory material dust serious damage

Refractory powder is not the same degree of free silica rich, up to more than 90% free silica content in the meantime silica brick. Therefore, the most serious dust damage is silica brick, followed by clay brick, high alumina brick, and magnesia brick.

China refractories Production Company is severe silicosis incidence condition. Since liberation, although adopted a series of dustproof measures, but the rate is still higher incidence of silicosis. Dust damage refractory works not only the formation of damage is serious, and give the company to infinite economic loss. Due to silicosis patients not only consumption to the company a substantial medical cure cost, and form a direct economic loss of great. Therefore, do a good job of refractories production of dust is very important.

Refractory material production should adopt mechanization, the production closed, and the succession, try to cut the material transfer links, drop drop height of material, and shorten the delivery of material interval. The same nature of the production process equipment should be gathered and resettlement, and satisfied with the working demand vertical or horizontal pipeline. Production equipment placement, conditions for reasonable placement of dust should supply the necessity of the system, and for the dust removal equipment maintenance places set aside to meet.

The above is about refractory material dust damage to adopt measures introduced, to help you expect after reading, if you have other questions to consult to contact us.

Special high-temperature refractory bricks

In warship power device of large, marine fuel boiler is the heart of it, if the refractory brick hearth collapsed, the warship will be unable to sail, and can not be repaired in a short period of time, will cause the occurrence of very great accident, so can the development of a
new type high-temperature refractory bricks then, we can avoid this situation happened. The special high-temperature refractory bricks must withstand strong fire baking, the endfire resistance to high? This is something we must do the experiment, the general point of gold is already very high, but the refractory brick to withstand temperature must also high than its melting point can be.

General refractory temperature can reach 1500 degrees Celsius even a super high temperature refractory material, but for many refractory materials, the degree of every increase of 50 degrees Celsius would have been difficult to exceed. Like this on the battleship using ultra high temperature refractory brick products, even the best domestic refractories and refractory brick, the use of such to any field can play a very good advantage. It is not only the heat resistance is good, the service life of the refractory material in general than is relatively long compared.

Special high-temperature refractory brick is refractory and heat insulation, practicality is very strong, but compared to the refractory brick in general, this ultra high temperature refractory brick products can not be beyond the.

Refractory material how to use can have anti damage ability

How to use Refractory let it has anti damage ability? The development of matching with refractory material according to the clinker rotary kiln each work with the different mining conditions, in a targeted manner to configure different anti damage of refractory materials, and considering the basic matching problem of each work tape lining service life, reduce maintenance times to stop the kiln, each work with lining, reach namely damage resistance independent and phase the purpose of matching cycle. Lining material preheating zone selection of good chemical stability, alkali erosion leaf wax stone brick and strong, the high siliceous raw pyrophyllite with low alkali, alkali resistant bricks made of this raw material, whether or not to burn the Chengdu firing with alkali resistance strong, but the strength is high, nearly doubled than clay brick life.

The completion of the industrial experiment stage in Krivoy Rog coking plants, coke oven masonry and recommended room three thermal repair methods: flame gunning; using oxygen to the ceramic welding; using the exothermic material (heating material) to repair. The process principle of common: with the help of heat generated to form a protective layer on the surface of refractory composite masonry mending surface.

Flame gunning method of flame gunning refractory products, powder particles melt in the liquid or gaseous fuel flame, and was sent to the surface to be repaired. At this point the masonry was nozzle flame supplementary heating, so using this method may not have special restrictions on temperature is put forward in this paper, and can adopt refractory powder cheaper to obtain high-quality gunning layer. Principle of ceramic welding method is adding to the material of strong oxidant (exothermic material) – aluminum and silicon. Wind transport by means of oxygen jet flame method, oxidant and refractory powder to the surface to be repaired.

The reasons of refractory brick collapse in the process of use

For refractory brick, we should not feel strange. With the progress of society, the application of refractory brick is more and more widely. Refractory brick appear collapse phenomenon, in the actual use so, what causes it; following the Xinmi Changxing refractory material factory is simple to give you introduced the refractory brick collapse reason

Refractory brick 1, red hot suddenly quenched with water to produce rupture and fall.

The 2 stage, oven heating rate master is not strict, temperature rise too fast, causing severe dehydration, masonry and damage due to expansion and shrinkage.

3 build stove masonry to expand stay insufficient, cracked and falling temperature after expansion.

4, the ash accumulation system, most of the metal salt corrosion of the refractory brick, embitterment of vanadium and nickel will penetrate into the refractory brick falling off caused by.

5 when the liquefied gas, heating, air flow ratio is undeserved, cause furnace blasting and vibration split off.

6, poor air flow furnace, flame directly flush furnace brick, the furnace brick thinning after a serious fall.

7, the operation too, lifting furnace temperature pressure to balance, it is strictly prohibited to excessive temperature and pressure, avoid the sharp rise in the drop, because the temperature of each layer of brick always lags behind the furnace temperature, the more rely on the outer temperature changes more slowly, if drastic changes in a short time the temperature of the furnace, brick layer between refractory brick and brick joints rupture is caused due to temperature difference is too large to generate huge internal stress. Furnace pressure will cause the sudden change, refractory brick for each layer of gas pressure can’t balance, pressure increasing and destroyed, may cause the whole refractory lining of furnace temperature fluctuation pressure serious collapse.

Refractory performance requirements of blast furnace trough

The performance of blast furnace trough refractories used what are the requirements? According to introducing, blast furnace trough is leads to high temperature molten iron or slag channel. In the production process to the following destructive effect subjected to several factors:

(1) Said the intense erosion and erosion refractory material withstands high temperature molten iron and slag flow.

(2) The chemical erosion of blast furnace slag.

(3) The destruction of action of thermal shock and intense intermittent iron.

Therefore, the requirements of trough lining refractory material to have the following characteristics:

(1) Trough lining stronger anti high temperature molten iron and slag corrosion and erosion ability of refractory materials.

(2) With anti high temperature performance and excellent wear resistance.

(3) The chemical erosion of stronger anti high temperature slag.

(4) Better thermal shock resistance, small changes in heavy firing.

(5) Against various oxidative ability stronger.

(6) Easy construction, convenient for disassembly and repair, does not produce harmful gases, is conducive to the Protect environment.

Xinmi Changxing refractory experts introducing the construction method, in addition to the use of blast furnace spray paint, blast furnace ramming material, by using the method of vibration molding or casting molding trough. When using these two methods can not dismantle the trough residues lining, making full use of original trench lining, thereby reducing the consumption of refractory material, at the same time, to improve the working conditions of construction. In order to prolong the service life of iron trough…

Additives selection added into refractory brick

Resin-bonded carbon magnesia brick because of their excellent thermal shock resistance and slag resistance has been applied in the steel industry in particular, basic oxygen furnace and electric arc furnace. Carbon has excellent performance: as high thermal conductivity, low coefficient of thermal expansion, high thermal shock resistance, while the poor wettability slags it has good resistance to corrosion and erosion resistance.

Ceramic material ( SiC, carbon silicon oxide) to make coatings on graphite or carbon fiber sheet, impregnated with phosphate, cement foam board price and the use of the surface glaze. These expensive methods have certain limitations in the use of the refractory bricks and a method of fine particles by a steam treatment to boron, TiB2, ZrB2, and SiC and other materials for thermal barrier coating on a graphite or carbon composite material.

One method commonly used in refractory bricks is to add the antioxidant materials of fine-grained, such as adding SiC, B4C, metal Al, Mg, and (or) Si or the like to prevent or limit the carbon MgO-C bricks at a high temperature (> 1400 ℃) oxidation. Similarly, these additives are expensive, and can not completely prevent the oxidation of the carbon at a low temperature. The coating solution of 60% solids and 40% of the liquid blend, wherein the liquid binding agent is a mixture of phosphoric acid and ethanol (30% liquid solution). After the MgO-C bricks overcoat thickness of about brushing 0.8mm, samples was coated with the coating were dried at room temperature of about 10min. In practice, pre-heating the ladle after 5h to 1200 ℃, due to some difficulties in the steel making process may take longer.

Experts explain you the defects of production of clay brick

Many long-term use of brick friends all know that clay is the oldest and most widely used refractories, enrich its raw materials, processing is simple, inexpensive, however, from an environmental perspective fired clay to consume large amounts of arable land , which for a large population, 80% of farmers’ agricultural country concerned, is not in line with national policy. Environmental damage large, due to the clay soil excavated mainly by sintering, and therefore damage to soil and vegetation damage, resulting in soil erosion, bad environment was severely damaged, so the country is gradually stop the project using clay.

There are other disadvantages clay, such as: ① poor sound insulation, sound propagation to the clay due to its porosity is small, there is no isolation of the sound, the sound decibel reduction is small, and other masonry materials such as are used more aerated concrete block its porosity greater sound insulation effect is obvious; ② self-important, the weight of clay brick masonry wall material weight than other relatively large, making the structure needs to withstand greater weight, construction cost increases.

If clay to use as drywall, then do not sickness, it is easy to weathering, affect the appearance. So now there are many alternatives to brick, shale brick, concrete hollow blocks, clay hollow blocks, porous shale bricks, porous bricks and so on.

Introduction of refractory HCS

The compressive strength of the high temperature refractory material (hot crushing strength, abbreviated HCS) is the maximum pressure of the material at a high temperature higher than 1000-1200 ℃ hot state per unit area can withstand (in units of MPa). Refractory compressive strength generally increases with the increase of temperature changes significantly. With increasing temperature from the room temperature, the intensity decreased linearly. Since then, some materials still continue to decline with increasing temperature; some material when the temperature rises within a certain range, with increasing temperature, and reaches a maximum in accounts under a certain temperature, followed by a sharp decline.

Changes in the compressive strength of high temperature refractory products by certain components of the material, in particular wherein the matrix or binding phase change occurs at a high temperature is controlled. Generally, the crystal is completely composed of sintered refractory material, and due to the high temperature grain boundaries wherein the grains are prone to plastic deformation, especially when its loading rate is small are more likely to plastically deform, so the strength increases with increasing temperature andreduced. Some of the crystal when the melt or at an elevated temperature to form a molten body, such as brick, alumina bricks, and clay, the matrix phase mainly composed of glass, as the temperature increases, the strength of the multiphase material of this was also due microstructure changes with temperature decrease.

When the temperature is further increased, since the viscosity of the glass phase becomes brittle toughness, so that binding between the material particles are more strongly, so that the strength is remarkably improved. Then, as the temperature increases, the melt viscosity of the material due to a sharp decline in the strength of the material also will be a sharp decline.

Refractory brick grinder designing needs to follow the rules

Refractory brick in the production process cannot do without the help of the size and quality of mold, mold determines the quality of refractory brick molding, the following is the principle of making refractory brick shaping mould:

1, the form must be smooth surface, smooth, and have higher hardness.

2, installation of formwork should taper, under the mouth small, big, catchy symmetry, and to ensure that qualified size refractory brick. Taper model after installation is generally 5/1000.

3, uneven surface should be made into a hopper.

4, as far as possible to make the maximum area of the firebrick as the compression face.

Ditch edge at 5, within the model with radian, template at a corner with L – 2 mm arc.

6, in the event of a mould bottom protruding part, try to make the survival of wedge.

7, the scaling length ratio. The general is according to different kind of brick and clay, is determined by the actual test. At present, China’s production of brick, scaling rate is generally 3-4%; length ratio put clay brick for 1-2.5%.

8, thick skin: refractory brick more than 150 mm, should consider two pressures.

Through the above simple introduction I hope can help to you, we produced the high quality and low price firebrick , please contact us if you have the need.

Refractory application requirements of guard fired boiler

Boiler combustion properties with refractory material should have included slag resistance, high strength, wear resistance, thermal stability, and thermal conductivity higher performance. The traditional ignition belt mainly used chrome refractory ramming material, but because of the high chromium resource scarcity, therefore is the main use of siliconcarbide ramming material, silicon carbide high alumina coating material, high aluminum phosphate can be plastic, plastic high-temperature expansion.

The first two kinds of materials are expensive, but long life, good performance, and then two kinds of material price is low, but performance in general, and short service life. Therefore in the cyclone furnace slag tap furnace and should not be used in high phosphate refractory plastic or ramming material, avoid peeling or cracks in use, so as to improve the slag resistance of material and reduce the repair frequency.

High-temperature micro expansion refractory plastic and super 3000 water clay refractory performance considerably, showing some advantages when applied to a wall pipe and the top of the boiler. But the material in its solidification time is long, easy to dry shrinkage crack, so as to the construction and maintenance of a big trouble. At the same time delivery quality exist certain volatility, sometimes refractoriness and strength at room temperature is below 1580 degrees and 981N/cm2.

Experts explain – clay firebrick compliance requirements

The experts tell you fireclay brick compliance requirements. Acceptance of fireclay bricks masonry of refractory brick works, to carefully check the flue, furnace, special attention should be paid to the vault, is the single arch, the bottom of the equipment. The next writer will give you detailed introduce:

1, in the masonry firebrick, refractory material used and the mud, according to the level and composition of label, shall be in accordance with specifications and drawings;

2, to ensure the quality of masonry of refractory clay brick is good, also is to follow the wrong sewing, levelness and verticality, mortar joint thickness and standard, size and drawings in accordance with;

3, in the process of acceptance of the furnace body, assign out for shop assistant director must personally from top to bottom, according to each part of the furnace body check, are several mortar joint thickness inspection, furnace body parts when measured by acceptance necessary enrollment size, careful examination of many important structure of the furnace body the building.

The above is writer introduce you acceptance fire brick requirements, for reference purposes only, hope to help you, if you have what doubt, please feel free to contact us!

Different boiler need different refractories

we have known using of refractory material boiler knowledge, but the boiler in different request of refractory materials are not the same, today let technicalpersonnel Yilong to tell you different boiler need what refractories.

Boiler generally the most commonly usedrefractories are power generation boiler and boiler. Power boiler refractory material, according to its component is different, different temperature, so the choice of refractory materials to match. So power refractory boiler used mainly for unshaped refractory lining. Refractory material general should be placed in the burner and burner and other parts, but due to the existence of the temperature is too high, recommended to choose high alumina or refractory clay; on the other hand is the ordinary boiler refractory material, the common boiler is composed of furnace tube system and combustion chamber and other parts, the existing working pressure is not high, but also need to withstand high temperature, so we choose the clay brick level inside, the rest three level brick. So boiler using different refractory brick is also different, we must choose the refractory brick for the boiler according to the nature of the boiler.

The content of the boiler, for the different selection of refractory material requirements of knowledge you have some understanding of it, if you want to know more about the refractory material knowledge can consult us freely.

Several methods of refractory brick masonry

Refractory brick masonry is divided into: 1, flat bond 2, side wall 3, vertical wall, next to the three bond one one to do a detailed description of.

1. Refractory brick – laid flat method

Flat wall is mostly for furnace wall, there are a few for the bottom most layer. In China, the most common flat wall, brick wall “with a” bond. Circular bricklaying (like the wall of blast furnace is the bond that).

2. Refractory brick side wall

The side masonry method mainly used in two parts: one is the brick layer, such as the open hearth and the bottom of the heating furnace; two is the side masonry arch, such as the open hearth furnace steel tapping hole arch.

3. Refractory brick – vertical masonry method

Vertical – also called soldier, mainly used in two parts: one is the top bottom, such as the open hearth furnace bottom and furnace bottom; two is the working layer of bottom, such as the open hearth bottom.

As straight standard firebrick (230x114x65 mm) as an example, laid flat and its maximal plane (230×114 mm). In a horizontal position; side of the side block (also known as the mid plane, 230×65 mm) in a horizontal position; vertical masonry is small (114×65 mm) in a horizontal position

New type of refractory castable——Steel fiber reinforced refractory castable

Steel fiber reinforced refractory castable refers to the high alumina bauxite or corundum as aggregate and powder, binder and adding amount of heat resistant stainless steel, refractory castable can also add the appropriate admixture prepared.

Steel fiber reinforced refractory castable for kiln door rotary kiln mouth, cover, pulverized coal injection pipe, front cooler and other high temperature parts and other industrial furnace lining, steel fiber reinforced refractory castable is suitable for building high temperature mechanical shock, heat shock, wear parts. Steel fiber reinforced refractory castable has the advantages of easy construction, high strength, good abrasion resistance, good thermal shock resistance, anti gas erosion corrosion, good resistance to spalling etc..

Luoyang Yilong refractory material Co., Ltd. the large-scale production of refractory castable, refractory brick products. The use of modern management mode, to automated, computerized one-stop production, technology manufacturing professional basis, refine on, forming many series, variety (specifications) model is complete, trusted by our customers.

The relationship between wear resistance of refractory bricks and temperature

What is the relationship between the abrasion resistance of refractory brick and temperature, so here we briefly introduce:

Some materials such as silicon aluminum refractory brick, it is generally believed that under certain temperature (as in the 700 ~ 900 ℃ within elastic range), the higher the temperature wear resistance is low, can be considered as the temperature is increased with the increase of the elastic modulus, wear resistance decrease. When the temperature increased, reaching a maximum of elastic modulus, with lower elastic modulus, wear resistance increase instead. Such as aluminum silicate refractory brick in 1200 ～ 1350 ℃, the wear resistance even better than at room temperature, when the temperature is further increased, up to 1400 ℃ + for refractory brick in liquid phase viscosity decreases sharply decreased, wear resistance. Some brick such as chrome quality products, with the temperature increasing, the wear resistance increased.