Introduction and application of Aluminum silicate fiber tiles

Aluminum silicate fibertiles (ceramic fiber tiles) divided into low temperature ceramic fiber brick and high temperature ceramic fiber brick;

using temperature between 800-1400 degrees. The main raw material for the aluminum silicate fiber cotton, using vacuum suction filtration molding production process, and add silica, aluminum phosphate inorganic binder, whose role is to ensure that the high-temperature strength of the products.

Aluminosilicate refractory fibers have excellent slag resistance and thermal shock resistance. Comparison with magnesium carbon refractories, refractory ceramic fiber has better anti-TiO2 slag alkali corrosion and corrosion. In addition, aluminum silicate fiber tiles also has low thermal conductivity, heat capacity, excellent chemical stability, excellent sound absorption, soft, flexible, easy construction, cutting and processing characteristics.

Aluminosilicate refractory fibers have excellent slag resistance and thermal shock resistance.

Comparison with magnesium carbon refractories, refractory ceramic fiber has better anti-TiO2 corrosion and slag alkali corrosion. In addition, ceramic fiber tiles also has low thermal conductivity, heat capacity, excellent chemical stability, excellent sound absorption, soft, flexible, easy construction, cutting and processing characteristics.

Aluminum silicate fiber tiles are mainly used in the construction of various chemical transformation furnaces and furnace linings, construction safety, convenience, while improving the quality of the lining inside the furnace and conversion work has played a crucial role.

Recent Status of graphite industry

Graphite is most common in marble, schist or gneiss, due to its special structure, with many features high temperature resistance, thermal shock resistance, electrical conductivity, lubricity, chemical stability and plasticity,

is the modern industrial and military high, new, sharp technological developments are an important strategic resource. Experts had said, "The 20th century was the century of silicon, the 21st century will be the century of carbon."

From the distribution of resources situation exists, Asia, Europe, Africa, the Americas, Oceania has a graphite deposit, but the Asian production of graphite most. According to USGS statistics, the world's graphite resources proved reserves of approximately 84 million tons, of which China reserves of 64 million tons, accounting for 74% of the world's total reserves. 2010 global production of about 925,000 tons, of which China output of 600,000 tons, accounting for 64.9% of global output. Due to the lack of regulatory industry disorderly competition leads to serious waste of resources. However, this situation is expected with the implementation of access conditions change.

According to the U.S. Geological Survey, in 2011 the major downstream industry needs in the graphite refractory crucible 33% (China more than 40%), casting and steel manufacturing accounted for 26%, 7% of the brake lining, battery and lubricant 5%, 29% for other purposes.Access conditions put forward, "Twelve Five" period, based on domestic demand, and strictly control the incremental, focusing on optimizing inventory, actively adjusting structure, promoting mergers and acquisitions, increased industrial concentration. 

Special aluminum carbon refractories

Special refractory aluminum carbon and carbon refers to aluminum as raw materials, in most cases, added to other materials, such as SiC, metals Si, Al, etc., bonded together with an organic resin or pitch carbon composite binder special refractories. Broadly speaking, the alumina and carbon as main components are called refractory carbonaceous refractory aluminum. Aluminum carbon refractories their different production processes can be divided into two categories:

do not burn carbon refractories and firing aluminum aluminum carbon refractories.

Aluminum does not burn carbon refractories are bound carbon refractories, because of its antioxidant activity was significantly better than Bricks and excellent anti-corrosion performance system Na2O slag, so widely in the blast furnace, ladle hot metal pretreatment equipment, etc. applications. Aluminum carbon refractories are fired combined-type ceramic refractories, because of its high strength, good resistance to corrosion and thermal shock resistance, and thus a large number of suitable casting sliding gate system with skateboard brick and casting Big Three, namely long nozzle, submerged nozzle and overall stopper rods.

Alumina has a high resistance to acid, basic slag, metal and glass capacity effect solution. It is a high temperature in an oxidizing atmosphere or under a reducing atmosphere used can be a good effect. Carbon and graphite materials have a particularly high thermal conductivity and low coefficient of linear expansion, while a solution having a high temperature with no residue and wettability. So aluminum carbon brick has the following properties.

(1)    aluminum carbon refractories have excellent slag resistance and thermal shock resistance. Compared with magnesium carbon refractories, aluminum carbon refractories have better resistance to alkali TiO2 slag erosion and corrosion capabilities.

(2)    For aluminum baking carbon bricks, because silicon and carbon additives at a high temperature to form silicon carbide, so as to have a double bonding system, i.e., a combination of carbon and ceramic bond, and thus calcined alumina carbon refractory with high mechanical performance, not only act as a conventional continuous casting refractories, and is a functional configuration of the material.

Refractories used in steel smelting

Blast furnace refractories:

Development of blast furnace ceramic cup increasingly common, but require high corrosion resistance of refractories application to ensure its life extended. In addition to changes in the design of the refractory material respects, great changes have taken place, such as a micro porous carbon brick ordinary charcoal instead of the past in order to reduce the penetration of molten iron. Clay refractory bricks used as raw material can adapt to the requirements stemming mouth of iron. Grouting method using blast furnace repair backing backing can effectively prevent the erosion of hot air, thereby extending the life of the blast furnace lining.

Clay refractory bricks used as raw material can adapt to the requirements stemming mouth of iron. Grouting method using blast furnace repair backing backing can effectively prevent the erosion of hot air, thereby extending the life of the blast furnace lining.

Converter refractories:

In steelmaking, the kind of water-cooled technolovgy and suspension systems are in the upper part and the lower cone barrel parts BOF shell has been applied, thus reducing the converter furnace deformation, extending converter lining life, improve productivity converter. These new technologies have some impact on the use of refractories. So that the converter furnace furnace up to 4000 more than the average, combined with gunning, the application of high lime and dolomite applications and slag splashing technology, furnace over 10,000 times is not a problem. This is the direction of development of refractories producer worth attention.

Submerged nozzle for continuous casting:

Since the development of the system of casting tundish transfer station from the past into the present effects of cast steel quality and increase the productivity

of the metallurgical vessel. Therefore, many functional materials gradually applied in the middle of the package, such as slag dam, impact plates, filters, plugs, etc. argon permeability.

Submerged nozzle as an important function of continuous casting refractories, research carried out mainly focused on two aspects, one is to improve the corrosion resistance of slag line, the second is to reduce the inner wall of Al2O3 attachment. Take the ZrO2 content increased 88%, as well as a good measure of the particle size distribution can reduce the thermal expansion coefficient and porosity of products, improve the density improvement slag resistance.