Analysis of the reasons of damaged blast furnace lining fire brick

blast furnace refractory lining material

1.Temperature.

The damaged performance of high temperature to fire brick:
(1)Erosion. When the edge air develops excessively, but the factory uses poor quality refractory material which has lower refractoriness under load, if the high temperature is over than allowable temperature, the fire lining brick will be eroded.
(2)Heat stress.
(3)Thermal shock. Thermal shock is a phenomenon when the fire brick meet the unsteady thermal stress and then become damaged.Cracks will occur in the refractory bricks and eventually broken.

2.Mechanical erosion and abrasion

3.Chemical attack

4.One of the important factors of firebrick refractory sale lining damage is unreasonable design, construct and furnace structure. Poor quality refractory and furance construction create the condition for the first kind of destructive factors.

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Refractory materials for coke ovens

Refractory materials

Coke oven is the technical equipment of coking plant, is a complex and continuous production of thermal equipment, mainly by the combustion chamber, carbonization room, regenerative, roof, chute, small flue and other components. Its purpose is in the isolated air conditions, the coal heated to 950 ~ 1100 ℃, after dry distillation to obtain coke and other by-products.
At present, the life of a coke oven is generally 25 to 30 years, the use of refractories mainly silica brick, clay brick, high alumina refractory bricks. The environmental conditions of the various parts of the coke oven and the requirements for refractory materials are as follows:
Carbonization chamber and partition wall of combustion chamber
The partition wall acts to heat the heat and isolate the furnace gas and support the load. Coke coking temperature is generally 950 ~ 1050 ℃, in order to ensure coking, coke oven wall carbonization chamber side of the surface temperature should be heated to 1100 ~ 1450 ℃; carbonization chamber side of the wall to be thrusting wear; due to coal dry distillation, coking The process in the isolated air conditions, the requirements of the wall air tightness, high temperature airtight, does not occur shrinkage deformation, product shape regular, accurate size to ensure that the small cracks and not cause cracks in the cracks; carbonization chamber in the coking process There is water discharge, the combustion of indoor combustion products contain a small amount of water, and because of coal salt chemical erosion and gas decomposition and carbon deposition, may damage the walls of the organization and performance, strength decreased.
Based on the above characteristics, carbonization chamber and combustion chamber with refractory materials, the world's coke oven almost all use silicon brick. Silica brick compared with other refractories, in the range of 700 ~ 1450 ℃ within the product changes and thermal conductivity of the small changes in its high temperature strength is high, the load softening temperature and its similarity (1620 ~ 1660 ℃), wear resistance, It is not easy to hydrate. With the large-scale coke oven and strengthen the production needs, can also be used thermal conductivity, volume stability, high temperature strength are high silicon carbide refractories. But the price is expensive, in the oxidative atmosphere easily oxidized damage, so the curtain wall is rarely used. And the incorporation of metal oxide high-density high thermal conductivity of silicon brick, wall thickness can be reduced, the intensity of heat transfer, improve the productivity of coke oven, but also improve the furnace life.

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Refractory materials for iron and steel smelting

Refractory materials

Blast furnace refractories:
The development of blast furnace ceramic cups is becoming more and more common, but the need for high corrosion resistance refractory applications to ensure the extension of its service life. In addition to changes in design, refractory material also has a great change, such as micro-porous carbon refractory brick instead of the past, ordinary carbon block to reduce the penetration of molten iron. Used clay refractory bricks as raw materials can better meet the requirements of the use of iron mouth guns. The use of grouting method to repair the blast furnace backing can effectively prevent the erosion of the hot air flow, thereby extending the life of blast furnace lining.
Refractory for converter:
In the aspect of converter steelmaking, a water cooling technology and suspension system are respectively applied in the upper cone and lower barrel parts of the converter shell, thereby reducing the deformation of the converter furnace, prolonging the life of the converter lining and improving the converter productivity. The application of these new technologies has had a certain impact on the use of refractories. So that the converter furnace age increased to an average of 4000 furnace or more, combined with the spray, high lime and dolomite applications and slag splashing furnace technology applications, furnace age more than 10,000 times is not a problem. It is worth the attention of refractory producers to the direction of development.
Continuous submerged nozzle:
Due to the development of the continuous casting system, the tundish has changed from the past transit station to the present metallurgical container which affects the quality of cast steel and improves the productivity of cast steel. Therefore, many functional materials are gradually used in tundish, such as slag weir, impact plate, filter, blowing argon breathable plug and so on.
Immersion nozzle as an important function of continuous casting refractory material, the research carried out mainly in two aspects, one is to improve the slag line parts of the anti-erosion, the second is to reduce the wall of Al2O3 adhesion. The measures to increase the ZrO2 content to 88% and to optimize the particle size distribution can reduce the thermal expansion and porosity of the product and improve the density to improve the slag resistance.
In addition, we should pay close attention to the technological progress of the user industry, such as the recent years of the emergence of direct reduction of iron, and DC arc furnace steel and other new technology on the new requirements of refractories.

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Furnace with the overall refractory

Furnace with the overall refractory

Rolling furnace is the main business of iron and steel enterprises thermal equipment, its performance directly affect the performance of the enterprise's production and economic benefits, for the majority of thermal workers to improve the performance of the furnace and operating conditions, reduce energy consumption, improve Furnace life, extended overhaul cycle, gallbladder, and achieved encouraging results. In recent years with the mechanical and electrical, refractory materials and other new technologies and materials continue to develop, there have been different design of the regenerative heating furnace, the technical indicators compared with the traditional heating furnace has greatly improved. In the case of
At present, I am in the provision of complete sets of furnace refractories, has accumulated a wealth of practical experience, according to the user's actual use requirements, to provide a reasonable combination of refractory products, the furnace for comprehensive furnace, supporting the use of lower Cost, improve life.
To provide high quality and efficient products, and constantly develop new products, good after-sales technical services, and users work closely with the new product applications to solve the technical problems, so that the new refractory products have been successfully applied, and create economic benefits for users, we Consistent work policy; also my company's purpose.
Some of the products are listed below:
Gravity castable
In addition to the characteristics of high-performance refractory castable, its outstanding advantages are excellent construction performance, construction without vibration, can automatically flow, degassing and dense, the construction of time-saving, effort , High efficiency, to ensure the integrity of the construction body, uniformity and air tightness, in particular, to adapt to the complex structure, high quality requirements of the site, once available by the user's wide welcome. Series of self-flow castables of the technical indicators:
Chrome corundum platform refractory brick, slide brick, brick tiles
The furnace trough and tapping platform mechanical wear serious, the temperature fluctuations, high temperature, slag erosion serious, the use of the conditions are extremely harsh, often because of the material wear and tear was forced to stop production maintenance. Where the use of steel fiber reinforced castables, fused mullite tiles, water-cooled cast iron, etc., although achieved good results, but with the increase in production capacity and maintenance cycle to extend the material on the higher The request.
Platform brick, slide brick, refractory brick tiles with high strength, excellent wear resistance and anti-slag erosion strong, long life (up to 1 to 2 years) and so on.

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Analysis on firing method of mullite refractory brick

Mullite bricks are sintered mullite bricks and fused mullite bricks.
Mullite Insulating Firebrick refractoriness higher, up to 1790 ℃ or more. The softening start temperature of the load is 1600 to 1700 ° C. Room temperature compressive strength of 70 ~ 260MPa. Thermal shock resistance is good.

Mullite bricks are sintered mullite refractory brick and fused mullite bricks. Sintered mullite brick to bauxite clinker as the main raw material, adding a small amount of clay or bauxite as binder, by molding, firing and made. Fused mullite bricks to high bauxite, industrial alumina and refractory clay as raw materials, by adding charcoal or coke fine particles as reducing agent, forming after the use of reduced melting method to manufacture. The fused mullite is more crystalline than the sintered mullite and has a better thermal shock resistance than the sintered product. Their high temperature properties depend mainly on the alumina content and the homogeneity of the mullite phase with the glass distribution. Mainly used for hot stove top, blast furnace and the bottom of the furnace, glass furnace regenerator, ceramic sintering kiln, oil cracking system, such as dead angle lining.

Mullite Insulating Firebrick---Refractory Brick---Refractory Material---Changxing Refractory

Mullite Insulating Firebrick

Introduction：
Light Weight Mullite Insulation Brick can be widely used as lining or insulation layers of various industrial furnaces and kilns in metallurgical industry, machine building industry, ceramic industry, chemical industry.

Advantages：
products containing a large number of closed pores, and a lightweight high temperature, good insulation properties, refiring small contraction, excellent thermal shock resistance, strong resistance to the corrosive gas and slag. Products can greatly improve the thermal efficiency of the kiln to shorten the production cycle, reduce the kiln body weight to achieve energy saving.

Application：
It has excellent thermal shock resistance, strong resistance to the corrosive gas and slag.

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The difference between anti-peeling high-alumina brick and ordinary high-alumina brick

Refractories are widely used in metallurgy, building materials, chemicals, petrochemicals and machinery manufacturing and other industrial areas, play an active role in the national economy. However, the application of refractories in high-temperature furnace evaluation, in addition to improving the service life, lower kiln energy consumption, it should also contain refractories in the production process of their own energy-saving, that is selected in the production of low-temperature firing, the product has the appropriate Of the high-temperature characteristics and low thermal conductivity.

Compared with the traditional high alumina brick, the thermal shock resistance is high, the strength is high, the chemical resistance is low, the coefficient of thermal expansion is low, the thermal conductivity is low, the firing temperature is low, and the material function is greatly improved. Consumption.

From the following aspects to clarify the problem:

First, the lower firing temperature 150 ~ C. Because of high temperature firing and insulation, especially in the greater than 1450 ℃ after the refractory refractory energy consumption can be infinite, according to the present refractory brick high-alumina brick 300,000 t / a count, estimated savings of 50,000 tons of standard coal.

Second, compared with the traditional high-alumina bricks, anti-shedding high-alumina brick thermal conductivity value of the former 2/3, or even lower, compared with magnesium chrome brick, as long as 1/3 ~ 2/3. Anti-shedding high-alumina brick and adjacent alkaline brick, lower carcass surface temperature 75-98 ℃, preliminary accounting can save nearly 2000t / a standard coal. Saving effect, considerable economic benefits.

Third, the traditional high-alumina brick can not enter the large-scale dry kiln, due to the use of life is too low, repair, stop kiln frequently form considerable energy loss and economic losses. More noteworthy is that it can not overcome the inherent weaknesses in the use of harsh locations.

Fourth, the world today with the rapid development of industry, to the formation of the Earth's environmental pollution infinite economic losses, the serious problems of human health has been more and more people's attention. In order to make a long life, we must take into account the material itself can not be a source of pollution. The excellent function of anti-shedding high-alumina bricks can largely replace the magnesia-chrome bricks. Magnesia-chrome brick in the course of processing and waste brick processing will bring serious "chromium pollution", its scientific component is carcinogenic substances. In Europe and the United States has gradually abandoned the production and use of this material, and quickly developed in the development of chromium-free goods, and anti-shedding high alumina brick is an excellent alternative.

The anti-drop high alumina brick is successfully used in the relevant parts of the cement kiln and used in the large-scale float glass kiln regenerator, instead of the traditional magnesia chrome brick, not only prolongs the kiln service life, but also eliminates the chromium pollution. In addition, the anti-shedding high-alumina brick firing temperature than magnesium-chrome brick low about 300 ℃, energy-saving effect is considerable.

Anti-shedding high-alumina brick as a versatile and efficient new energy-efficient refractory material, the American Ceramic Society magazine will be informed of this material as "the development of a potential by China's new high-alumina refractories." Anti-shedding high-alumina brick in the metallurgical and building materials industry has a wide range of applications.

Chrome Corundum Abrasion Resistance Prefabricated Part for Heating Furnace---Refractory Brick---Refractory Material---Changxing Refractory

Chrome Corundum Abrasion Resistance Prefabricated Part for Heating Furnace

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.

Introduction, Advantages, Application

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.


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Magnesia Alumina/Alumina Magnesia Carbon Brick---Refractory Brick---Refractory Material---Changxing Refractory

Alumina Magnesia Carbon Bricks are used in Ladle Sidewall and Bottom impact areas.

Magnesia Alumina Carbon Brick, Alumina Magnesia Carbon Brick

Introduction:
Alumina Magnesia Carbon Bricks is made from high quality bauxite, corundum and fused magnesia. It is formulated with very high purity alumina and magnesia.

Advantages:
It has low thermal conductivity, good isolation ability, and appropriate residual expansion

Application:
Alumina Magnesia Carbon Bricks are used in Ladle Sidewall and Bottom impact areas.

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.

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Taphole Brick---Refractory Brick---Changxing Refractory material

Taphole brick is molded at isostatic pressure, with fused magnesia and graphite as raw material. It is characterized by good oxidation resistance, high strength, good corrosion resistance, good integrity, easy replacing and long life and it is ideal material taphole of large and medium furnace.

Taphole Brick---Refractory material

Introduction and :

Taphole brick is molded at isostatic pressure, with fused magnesia and graphite as raw material. It is characterized by good oxidation resistance, high strength, good corrosion resistance, good integrity, easy replacing and long life and it is ideal material taphole of large and medium furnace.

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Magnesia Carbon Brick--Refractory Brick---Changxing Refractory material

Magnesia Carbon Brick is widely used in Electric Arc Furnace sidewalls, converters, hotspots and coldspots, and ladle furnace slag lines.

Magnesia Carbon Brick is mainly used for electric furnace lining, which enjoys advantages including high temperature resistance strength, corrosion and spalling resistance. 

Magnesia Carbon Brick

Introduction:
Magnesia carbon brick series used for the electric furnace are made by adoption of fused magnetite, high-purity magnesium sand and graphite as principal raw material, through high-pressure molding and low-temperature treatment. This product is mainly used for electric furnace lining, which enjoys advantages including high temperature resistance strength, corrosion and spalling resistance. According to the smelting conditions and the kind of smelting steel, different brands magnesia carbon bricks are available. Magnesia-carbon bricks are resin bonded bricks containing high-purity fused and or sintered magnesia and flake graphite as their main ingredients.

Advantages:
It has excellent corrosion resistance together with good thermal shock properties. It offers good oxidation resistance due to use of high purity flake graphite.

Application:
It is widely used in Electric Arc Furnace sidewalls, converters, hotspots and coldspots, and ladle furnace slag lines.

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Generality High Alumina Brick &Clay Brick

Generality High Alumina Brick &Clay Brick

Generality High Alumina Brick &Clay Brick

Introduction

Changxing Refractory's High Alumina Bricks and Fireclay range is available in different varieties/shapes as per the specifications given by the clients. We provide High Alumina Bricks that are highly resistant and durable without causing any environmental hazards maintaining High standards are made from a variety of raw materials having different properties. Shapes of the High Alumina Bricks are made as per the drawings and measurements provided by the clients and only high grade fireclay and raw materials are used in their manufacturing.
Advantages

It is used in lining furnace kilns, fireboxes and fireplaces. Its primary purpose is to withstand high temperature and also to retain the heat for greater energy efficiency. We offer wide range of low, medium & high alumina refractory firebricks. High alumina brick have very good ability of anti-acidity, anti-metal fluid corrode and anti-oxidation.
Application

High alumina brick have very good ability of anti-acidity, anti-metal fluid corrode and anti-oxidation.

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Recommendations active national green inorganic thermal insulation materials

According to the shape can be divided into: a fibrous facing, slag wool, rock wool, glass wool, aluminum silicate wool, ceramic fiber, microporous pile diatomaceous earth, calcium silicate, perlite, expanded vermiculite, aerated concrete, foam glass bubble-like, volcanic ash glass, clay foam, foam concrete, the paste-like powder particles of polystyrene insulation slurry and the like.

 Refractories used in various fields of steel, nonferrous metals, glass, cement, ceramics, petrochemical, machinery, boilers, light industry, power, military and other national economy, is to ensure that these industries and technological development, production and operation of essential basic materials, It plays an irreplaceable role in the development of high-temperature industrial production.

YT insulation material is non-combustible Class A, is one for use in a variety of climates safe environment protection and energy class A fire insulation products. It is based on a natural high temperature lightweight materials as aggregate, stepless modified materials and nano-scale ultra-low thermal conductivity (0.013W / (mk)) material, a flexible material and gradual blending of principle, the use of advanced international It promises bonding and cracking technology, through factory production configuration, to provide a high-quality one-component finished; it becomes insulation, thermal insulation, fire, light, sound, water resistant, anti-cracking, hollowing anti-shedding and other properties as one of the environmentally friendly energy-saving wall insulation energy-saving products, winter can raise the indoor temperature 5-8 degrees in summer can reduce the indoor temperature 4-7 degrees, to meet national energy requirements.

Summarized in the following six performance advantages:

1, insulation energy saving effect - the fusion of ultra-low thermal conductivity of the material for the products to provide a guarantee of energy-saving;

2, security, fire protection, long life --A level non-combustible material. Products are of high quality inorganic polymeric material having the same properties and building the wall can be achieved with the construction body with life;

3, the construction is simple and quick: - shorten the construction period by more than half since the product is one component inorganic product, you need only product on the wall and water, stirring to operate without excessive technical requirements on construction, you can usually plasterers operation and does not require high technical requirements and plate type construction complex process, so the duration shorten the time;

4, resistant to water, acid, strong adaptability. Products and wall seamless connectivity, high stability, weather resistance; can avoid building air conditioning panels, window sills, floors and other parts along the leakage, easy to form hollowing cracking problem; while its strong adhesion and acid adding an alkaline material, make the body to keep building more complete surface layer will not appear moldy walls, chalking phenomenon;

5, good environmental performance and comfortable - with a certain permeability. Component products are able to remain active, flexible component, which itself has cool breathability, so the use of the product will not be room tightness, able to create a body feel relaxed and comfortable environment.

6, cost-effective superior - Construction products easy to operate, and its construction without primary treatment, also without mesh, rivets, cracking mortar and leveling putty and other processes, greatly reducing labor costs and material costs; and its Wall body with the characteristics of life, but also to avoid a repeat engineering insulation waste.

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.

Introduction to the level classification of the Ceramic proppant

Refractories Ceramic proppant is used for oil deposit, which can improve oil output evidently. When putting in the gap of rock formation, which can show high diversion quality and increase oil output.
According to different raw material , there are several different level products:

1, Bauxite ceramic proppant is made from high quality bauxite and coal ash, which holds high refractoriness, high pressure reisistance and strong diversion. Bauxite ceramic proppant is environment friendly product, which is the most popular proppant in the world.
2, Fly ash ceramic proppant is made from solid rejected material and then mixed with water and cementitious matter, whose size is more than 5mm.
........................

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Low Cement Castable is More Widely Used in Aluminum Industry Than Before

Low cement castable mainly uses alumina material and silica powder as raw materials. It is a kind of powder materials, and is constituted by refractory material together with some agglutinant.

With the development of aluminum industry, the Clay, High Alumina insulating bricks for aluminum alloy melting furnace and holding furnace has been changed from phosphate combined high alumina brick to low cement castable which can prevent molten aluminum permeate refractory products. At the same time, it can extend service life of refractory material at high temperature.

When comes to the heating surface of aluminum, aluminum alloy melting furnace and holding furnace, the low cement castable has taken place of the phosphate combined with high alumina brick. The reasons are as bellow, there is smaller pore size in the structure of low cement castable, molten aluminum and aluminum alloy cannot permeate refractory company easily. It can avoid the oxide in refractory restoring from aluminum. At the same time, the low cement castable possesses high wear resistance. In recent years, as the low cement castable uses molten aluminum as additive, which increase the wetting agent, so the performance has been improved. This kind refractory material has taken place of traditional phosphate combined high alumina brick and low cement castable gradually.

Introduction of Runner castable

Low cement castable mainly uses alumina material and silica powder as raw materials. It is a kind of powder materials, and is constituted by refractory material together with some agglutinant.

    Runner castable is a kind of special castable which can flow without vibration and deaerate. When constructing, the product only needs a little water and can be poured into any shape without vibration.
    Runner castable is made from low cement castable and super-low cement castable, which is made from refractory aggregate, powder and high effective dispersing agent. When manufactured the runner castable, the most important thing is how to control size and quantity of powder, and how to mix with dispersing agent. Only with reasonable proportioning, and runner castable can flow by itself.
    Compared with common castable, the runner castable hold following advantages.
1. The runner castable can run without vibration with the help of deadweight.
2. Can run to every depart, especially where common castable cannot reach.
3. Can reflect the best performance of castable.
4. Reducing constructing time and save labour force.
5. Decreasing noise as more as possible.
    Without outstanding advantages, and application of runner castable is very wide, which can be widely applied for tundish, EAF triangular area, molten steel taping hole, heating furnace, blast furnace iron runner, iron casting induction furnace and so on.

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Modulation principle of slurry used for refractory brick

Light Weight Mullite Insulation Brick can be widely used as lining or insulation layers of various industrial furnaces and kilns in metallurgical industry, machine building industry, ceramic industry, chemical industry.

Brickwork with refractory slurry should follow the following principles:
    (1) to deal with all kinds of refractory slurry pre experiment and pre laying brick front, confirm the bonding time, different mud initial setting time, consistency and water;
    (2) Modulation of different mud to use different instruments, and timely cleaning;
    (3) Modulation is not homogeneous slurry to use clean water, water should be accurate weighing, blending uniformly, adjusted with the use. Have good hydraulicity and modulation of hard mud shall not add water use, has the initial setting of mud may not continue to use the;
    (4) Modulation with phosphate mud to ensure refractory material time trapped provisions, with the use of post set, well modulated mud arbitrarily diluted with water. This kind of mud for corrosive shall not be in direct contact with the metal shell.
    We take the zero defect management idea, through the refractory production process from beginning to end. All the time since, in the pursuit of perfect quality at the same time, also constantly improve the service system, concerned about each of your needs, to provide professional sales and technical service for you.

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The Best Refractories for Induction Furnace -- 25+ Heats Silica Ramming Mass

In recent years, silica ramming mass is widely used in induction furnace. Compared with traditional refractory lining material, this product is of lower cost, shorter sintering time and better working condition. 


To offer clients better refractory products, we have successfully developed our 25+ heats silica ramming mass. As per actual working, we summed up the material consumption as following.
1. First heat: 10-15mm
2. Rest heat: 3-5mm


As per our experience, we should leave 70mm as save level. So if the lining thickness is 180/300/450mm, we could promise the least service life of our refractory material to be 25 heats. If the working condition is convenient, 30-40 heats is no problem.


 Furthermore, our silica ramming mass can also be applied in tundish and ladle. Service life can namely be 48-60 hours/ 200+ heats. 


Because of the great advantages as above, our silica ramming mass is very welcomed by our clients all over the world say Bangladesh, Ghana, South Africa, and Indonesia, etc. If more interests, please feel free to make us informed, our professional teams are ready to give you our reliable service. For new clients, we would offer more preferential as following.
1. Lower price trial order
2. Professional refractory technicians overseas service


Therefore, what are you waiting for? Talk your phone and call us!

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How to Choose Refractory Bricks Used for Different Parts of Blast Furnace

Mainly used for coke oven, hot blast stove, acid steelmaking furnace and glass melting furnace. The products can be manufactured according to customers' different requirements.

 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.

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Requirements of Refractory Materials During Blast Furnace Lining Repair

Composed of high temperature electric sintered anthracite and graphite with additives, the products are mainly used for filling the gap between carbon blocks and cooling devices through cold ramming process, and also for the gaps between carbon blocks and between carbon blocks and refractor bricks.

Generally speaking, there are several blast furnace lining maintenance methods including grouting for lining making, cold spray technology, digging hole on furnace shell technology and remote control spray technology.


Grouting for lining technology can be widely applied to hot point short-term repair of blast furnace stack and furnace bosh. It is a means of prolonging furnace life, but it must be repaired repeatedly to keep the lining at a certain thickness. Different furnace parts use different refractory material, the mud consistency is a key element for the success of grouting for lining technology.


Using cold spray technology not only can make blast furnace cleaned thoroughly, but also can firmly bond old and new firebrick refractory and then lead to a good furnace lining form and make the first run of the blast furnace successful. While, repairing blast furnace in cold spray technology needs too much time, it is a limited element for its widely using.


Digging hole on furnace shell and gunning damaged parts with long gun technology is usually applied to damaged furnace lining and shell technology, it uses a long gun to spray and repair the inside damaged parts from outside. This method has the advantages of speed spraying and short wind time, but it is only suitable for partial damage.


Remote control gunning technology is an advanced technology which is now being developed and used in China and many other countries in recent years. Its gunning time is short and its gunning range is large, but it needs complex technology. 


In a word, grouting for lining technology requires appropriate refractories mud consistency; the other three repair technologies require good refractory adhesion under high temperature and normal temperature so that to make spraying coating in a certain thickness continuously, and the coating is tightly bonded into a no pull-off and dense formation which can be dried and warmed fast.