refractory

China’s metallurgical industry will continue to develop steadily, and the growth rate will be slower in terms of quantity and scale, but higher levels are required in terms of improving quality, developing varieties and reducing energy consumption. Therefore, backward and obsolete crafts and equipment will gradually be eliminated, and advanced technology and equipment promotion and application will accelerate. For example, in the steel industry, furnaces and small blast furnaces, converters and electric furnaces will be eliminated, while continuous casting and refining will be developed and promoted at a faster rate. These conditions will provide new and good opportunities for the development of the refractory brick industry, and also put forward new and strict requirements for the quality of refractory bricks, and will lead to more intense tens of refractory brick manufacturers in China. competition.
They must fight hard to survive and develop, and the decisive factors are as follows:
(1) Stability and reliability of product quality;
(2) Producing more efficient and competitive high-efficiency products for refractory bricks;
(3) Ability to develop high-quality new products with better performance and provide good after-sales service.
It is foreseeable that in the future, China’s refractory brick industry will adjust its product mix and increase the output of high-efficiency products. The development of high-efficiency products based on bauxite should be accelerated to further improve their quality and reduce costs. The competition between refractory bricks and amorphous materials (including preforms) will continue in the future. The production ratio of amorphous materials will increase greatly, and high-efficiency castables will take the lead: in this respect, the micro-powder process; (preparation and application) should be a focus of research and development.
Considering high temperature performance (mechanical properties, thermal shock resistance, erosion resistance and oxidation resistance), oxide and non-oxide composite materials are promising new high-quality and high-efficiency refractory bricks, which may rise in the new century. And gradually developed. This is an area worth exploring, investing in and developing. For China’s refractory brick industry, the beginning of the next century will be a period of structural optimization. Refractory brick manufacturers will be re-combined and adjusted; internal structure and management will be reformed; variety structure will be changed; process and equipment will be updated; adaptability to market economy will be improved, and it is expected that China’s refractory brick industry will catch up with high temperature by 2020 The pace of industrial development, and can adapt to the rhythm of the international refractory brick industry market.

The main performance of the kiln is mainly determined by the technical and economical performance of the refractories, which directly affects the investment cost, work performance, thermal efficiency, and energy consumption of the kiln. The general principle of choosing refractory materials:

1, the furnace performance and thermal characteristics. Kilns with intermittent work should use materials with low heat capacity.
2, the safe use of materials temperature, thermal conductivity, high temperature strength, chemical stability.
3, the use of life.
4, investment costs and operating maintenance costs.

In general, heavy refractory materials focus on a certain technical performance index, such as high temperature stability, chemical stability, etc.; lightweight insulation materials pay more attention to the integrated technical and economic indicators of input and operation.

When using lightweight insulation materials, it is generally determined by the thermal conductivity of the insulation material (λ) and the cost per unit volume of insulation material (Ρ). The smaller the value of the product of “λΡ”, the better. The small value of the thermal conductivity indicates that the thermal insulation material has a good thermal insulation effect and the energy cost during operation is low. The low cost per unit volume of insulation material indicates that the investment cost is low and has a good investment and economic effect. It can be selected by coordinate graphical method. The abscissa is the working temperature and the ordinate is the product of (λΡ). The curve of each material is intercepted by the safe use temperature of the material, and the material with good technical and economic performance is selected.

 The use of high alumina bauxite as the main raw material, the introduction of a small amount of ZrO2 (because ZrO2 is monoclinic and tetragonal phase transformation, can improve the product’s thermal shock stability), adding a certain amount of composite binder and additives, through the control of mud The particle size distribution of the materials, and the refractory products obtained by molding and high-temperature firing become anti-stripping high alumina bricks.
  The anti-stripping mechanism is due to the fact that the microstructure characteristics of ZrO2 have been determined to have anti-stripping properties.
       1 There are obvious micro-cracks around the ZrO2 aggregates. The aggregates have obvious clearance and peeling from the surrounding corundum and mullite.
       2 The well-developed ZrO2 aggregates are columnar and form a layered distribution in space. There are small slits between ZrO2. The size of the ZrO2 is only 1 to 5 μm, forming a channel structure. This kind of structure is superimposed on one another, with twists and turns, which is conducive to stress transmission and dispersion.
       3 Mullite is well developed and fibrous. It interlaces with ZrO2 and corundum to form a composite reinforced structure. Obviously, ZrSiO4 reacts with surrounding Al2O3 when decomposed at high temperature to form ZrO2 and mullite. The presence of ZrO2 crystals prevents the growth of fibrous mullite crystals and plate-shaped corundum and is wrapped by it. Therefore, it is present around ZrO2. Chaotic state.
       4 The petrographic analysis showed that the structures of corundum and mullite were staggered and ZrO2 intercalated. Among them, there were micro-cracks in the surroundings, and there were radial micro-cracks in the larger ZrO2 crystal itself and around it.
       The above-mentioned structure of the anti-stripping high-alumina brick will have energy dissipation when subjected to stress, and improve the effect of thermal stability and high-temperature strength.

Taking the road of sustainable development has always been a principle issue that must be followed and adhered to in the industrial development of our country and the world.
 The problem of waste of energy in industrial kilns has always existed, and heat losses generally account for about 22% to 24% of fuel consumption. Kiln insulation has received increasing attention. Conforming to the current environmental conservation sources and taking the green policy trend of sustainable development, the source of the festival has brought visible benefits to industry. Therefore, the rapid development of fire-resistant insulation material has made it widely used in industrial furnaces and high-temperature equipment industries.
 1. Glass tank bottom insulation:
The temperature of the bottom glass in the kiln is increased, and the glass flow increases. The method for constructing the insulation layer in the bottom of a common glass kiln tank is usually to increase the insulation layer of the bricks in the heavy refractory brick masonry or heavy indefinite refractories construction.
 The bottom insulation material is generally: lightweight clay insulation bricks, fireproof clay, asbestos and other fire-resistant insulation materials.
 2. Wall insulation:
For the pool wall, according to the usual practice, the most serious erosion and damage is at the inclined surface and the brick seams. Before the insulation measures are taken, one should try to grind the masonry plane of the brick wall tiles to make the bricks and bricks. The gap between the two reaches the minimum size. 2 Use large-size bricks as much as possible to reduce the number of brick seams. The wall insulation material is generally a lightweight clay insulation brick.
    The application of high-quality refractories determines the service life of industrial kiln furnaces and high-temperature equipment, the unit energy consumption of products and the output of products. The rapid development of fire-resistant and heat-insulating materials and the development of various new types of insulation materials have, to a certain extent, also promoted the development of industrial furnaces.

Taking the road of sustainable development has always been a principle issue that must be followed and adhered to in the industrial development of our country and the world.
 The problem of waste of energy in industrial kilns has always existed, and heat losses generally account for about 22% to 24% of fuel consumption. Kiln insulation has received increasing attention. Conforming to the current environmental conservation sources and taking the green policy trend of sustainable development, the source of the festival has brought visible benefits to industry. Therefore, the rapid development of fire-resistant insulation material has made it widely used in industrial furnaces and high-temperature equipment industries.
 1. Glass tank bottom insulation:
The temperature of the bottom glass in the kiln is increased, and the glass flow increases. The method for constructing the insulation layer in the bottom of a common glass kiln tank is usually to increase the insulation layer of the bricks in the heavy refractory brick masonry or heavy indefinite refractories construction.
 The bottom insulation material is generally: lightweight clay insulation bricks, fireproof clay, asbestos and other fire-resistant insulation materials.
 2. Wall insulation:
For the pool wall, according to the usual practice, the most serious erosion and damage is at the inclined surface and the brick seams. Before the insulation measures are taken, one should try to grind the masonry plane of the brick wall tiles to make the bricks and bricks. The gap between the two reaches the minimum size. 2 Use large-size bricks as much as possible to reduce the number of brick seams. The wall insulation material is generally a lightweight clay insulation brick.
    The application of high-quality refractories determines the service life of industrial kiln furnaces and high-temperature equipment, the unit energy consumption of products and the output of products. The rapid development of fire-resistant and heat-insulating materials and the development of various new types of insulation materials have, to a certain extent, also promoted the development of industrial furnaces.

The rational manufacture and selection of lightweight high-alumina bricks are of great significance to the rational use of energy and the correct implementation of China’s energy policies. Among various lightweight insulation materials, lightweight high-alumina bricks have high refractoriness and small bulk density; raw materials are abundant, and refractory bricks are inexpensive, which is an ideal heat insulation material. According to the manufacturing process, lightweight high-alumina bricks can be made by foaming or adding a person.

The rational manufacture and selection of lightweight high-alumina bricks are of great significance to the rational use of energy and the correct implementation of China’s energy policies. Among various lightweight insulation materials, lightweight high-alumina bricks have high refractoriness and small bulk density; raw materials are abundant, and refractory bricks are inexpensive, which is an ideal heat insulation material. According to the manufacturing process, lightweight high-alumina bricks can be made by foaming or adding a person.

The rational manufacture and selection of lightweight high-alumina bricks are of great significance to the rational use of energy and the correct implementation of China’s energy policies. Among various lightweight insulation materials, lightweight high-alumina bricks have high refractoriness and small bulk density; raw materials are abundant, and refractory bricks are inexpensive, which is an ideal heat insulation material. According to the manufacturing process, lightweight high-alumina bricks can be made by foaming or adding a person.

With the development of industrial technology, lightweight insulation refractories are developing in the direction of more high temperature resistance and thermal shock resistance, and improving the thermal shock resistance and mechanical p

With the development of industrial technology, lightweight insulation refractories are developing in the direction of more high temperature resistance and thermal shock resistance, and improving the thermal shock resistance and mechanical p

With the development of industrial technology, lightweight insulation refractories are developing in the direction of more high temperature resistance and thermal shock resistance, and improving the thermal shock resistance and mechanical p

We all know that insulation refractories are a kind of building materials. Generally speaking, those that are not flammable, they can be fired in a timely manner, and they will not immediately burn. It is a new type of development that can prevent or delay the fire insulation material. Potential energy-efficient building materials.
Insulation refractory material refers to refractory material with high porosity, low bulk density and low thermal conductivity. It is also called lightweight refractory material. Including insulation refractory products, refractory fibers and refractory fiber products. According to the use of temperature is divided into: low temperature insulation refractory material, the use of temperature is lower than 900 °C, such as diatomite insulation bricks, expanded silica products, calcium silicate board, expanded perlite products, etc.; temperature insulation refractories, the use of temperature 900 ~ 1200 °C , Such as clay insulation firebrick, aluminosilicate refractory fiber, etc.; high temperature insulation refractories, use temperature greater than 1200 °C, such as high aluminum insulation firebrick, alumina insulation firebrick, silica insulation firebrick, alumina hollow Ball bricks, zirconia hollow ball bricks, high-alumina fire-resistant fibers, polycrystalline refractory fibers (polycrystalline alumina fibers, polycrystalline zirconia fibers, polycrystalline mullite fiber) and so on.

The main characteristics of refractories are high porosity, generally above 45%; low bulk density, generally no more than 1.5g/cm3; low thermal conductivity, most of which is less than 1.0W/(m·K). It is mainly used as insulation for industrial furnaces. It can not only reduce the heat loss of the furnace, but also reduce the heat storage of the furnace, obtain the best energy-saving effect, and reduce the weight of thermal equipment. Compared with general refractory bricks, insulation refractories have poor slag resistance, mechanical strength and wear resistance. Therefore, it is not suitable for the load-bearing structure of the furnace and direct contact with slag, charge, molten metal and other parts.

Insulating refractories differ from refractories used for long nozzles and refractories used for sliding nozzles. The production of heat-resistant and refractory products mainly uses processes that can form porous structures, such as light-weight raw materials, burn-in additives, foams, and chemicals. Law and so on. Amorphous refractory fibers, such as aluminosilicate refractory fibers, high-alumina refractory fibers, etc., are usually produced by a melt process. Polycrystalline refractory fibers, such as mullite fibers, alumina fibers, etc., are produced by the colloidal process.