How to identify the quality of corundum brick in the market

Corundum brick has a good chemical stability, acidic or alkaline slag, metal and glass, etc. have a strong resistance, but now the market in the production of many enterprises, so we also have a lot of choice in the main issues, This requires us to have the ability to identify the quality of corundum brick in order to buy high-quality products.(http://www.corundumbrick.net/product/corundum_block.html)
The corundum brick in the market is mainly composed of corundum, corundum has a high corrosion resistance and high temperature characteristics, it is an important refractory brick, widely used in refractory production and processing. Smelting rare precious metals, special alloys, ceramics, iron ore blast furnace lining, another corundum also has a high hardness, good wear resistance, high strength characteristics, can be used in the production of various molds, knives, corundum brick can also made bulletproof material, corundum wear resistance can produce a variety of wear-resistant materials.
The corundum is divided into three grades: the first level of corundum, two and three, the quality of corundum mainly see its Al2o3, its content in the 94.5% -97%, and the other contains a small amount of Fe, Si, Ti Wait. Al2o3 content of more than 95% for the first grade corundum. Two corundum and three corundum content gradually reduced, the quality also will be reduced. Corundum fineness can look at the color to distinguish, because the corundum contains iron elements, iron elements for the reddish-brown, so brown corundum appears to be tan, you can see through the color of corundum brick grade and quality.

The Application of Mullite Insulation Brick is More and More Wide

In the early, mullite insulation brick is used as the main building insulation layer, or as a decorative and sound insulation, a new type of insulation material, compared to the previous clay red brick to use more convenient and better, with the technology The development of the times. Mullite insulation brick before the performance and characteristics have been far from our current requirements. And the application of insulation brick in various industries are more and more widely, we also need to manufacture and produce different properties of mullite insulation brick products.(http://www.insulatingbrick.com/product/mullite_insulation_brick.html)

And now mullite insulation brick products have been in a number of industries and areas of which a great victory in the insulation performance, strength, the weight is sufficient to meet our use requirements, but in the future we need to involve a lot , While we are in the heat insulation requirements for the standard is not only improve at the same time, also need to improve the other properties and characteristics, such as in the industrial furnace insulation which can not only save the furnace temperature, but also can save the furnace Coal gas consumption, reducing the production of waste of resources which also improve and protect the life of the furnace.

High temperature industry's requirements for refractory material

With the high temperature industry, an important base material, high temperature industry, especially the new development of iron and steel smelting technology, and promote the technological progress of the refractory industry. Of course, the technological advances in the refractory industry ensure the implementation of new high-temperature industrial technologies.
The refractory material industry is closely related to the high temperature industry, and new high-temperature technologies often require new refractories or better refractory performance as a prerequisite, while new technologies for high temperatures require more stringent requirements for refractories.
High temperature industrial refractories, must meet the requirements of high-temperature industrial new technologies:
1. Corundum block must give priority to good fire resistance, as high-temperature new technology usually requires higher temperatures, more stringent working conditions.
2. In addition to the traditional refractory function, the refractory must also meet the requirements of the implementation of other features of the new high-temperature technology.
3. When faced with high-temperature industrial new technology, but also need high-life and low-cost refractories, and now pay more attention to economic life, not just the pursuit of high life.

Thermal shock resistance physical and chemical properties of Refractory Brick

The thermal shock resistance of refractory brick is the comprehensive performance of their mechanical properties and thermal properties under the conditions of temperature change. Refractory brick subjected to rapid temperature changes, known as thermal shock. Firebrick in the thermal shock generated in the new crack, and the new crack and crack growth caused by the original crack, peeling, fracture and other conditions, known as the firebrick thermal shock damage. Thermal shock damage is the result of thermal stress, refractory bricks in the temperature changes, deformation is suppressed by the stress generated by thermal stress.
Reheat line change of silica brick, thermal stress is produced when the thermal expansion of refractory brick is evenly affected by the temperature gradient, as well as in the phase transition, when different phases are changed in temperature. The thermal stress is proportional to the elastic modulus and elastic strain of the refractory brick, and the modulus of elasticity of the refractory brick is the product of the linear expansion coefficient and the temperature change.
The thermal shock resistance of refractory brick is the ability of refractory brick to resist damage under the conditions of rapid temperature change. Has been said that thermal stability, thermal shock stability, thermal shock resistance, resistance to temperature abrupt change, resistance to abrupt heat,etc, refractory brick in the low temperature and medium temperature is brittle material, the lack of ductility, thermal equipment, refractory Brick is often subjected to drastic temperature changes that cause damage. Thermal shock resistance is one of the important performance properties of refractory brick.
The physical and chemical properties of refractory brick:
Refractory brick is metallurgical ferrosilicon and industrial silicon occurs when the SiO2 and Si gaseous oxygen and oxygen in the rapid condensation of the composition and an ultra-fine silicon powder material. The following describes the physical and chemical properties of refractory brick:
Refractory brick: the appearance of gray Jifen gray ﹑ refractoriness> 1600 ℃. Bulk density: 200 ~ 250 kg / cubic meter.

Which points should be paid attention to when using refractory material？

1.After pouring, if without adequate maintenance, due to the lining body early strength is low, the structure is loose, often too late to sintering has been damaged, lining up abruptly, sometimes burst.

2. The lining thickness of thin body, pouring the space is little, between mold and burner with a lot of cramp, pouring, vibrating, the operation of the vibrator is extremely difficult, operation not skilled or not serious, refractory castable vibrating false.

3.Casting during the construction of the space is little, construction personnel are often more mixing materials with water, to make the refractory castable has good liquidity, but increase the porosity in the refractory lining of the body, reduce the density of the lining body, thus reducing its strength (if refractory castable for chemical combination, add too much liquid binder, same adverse effects) : on the contrary, lining body vibrating close-grained, not also will shorten the service life of refractory castable.

4.When the winter construction, low temperature binder (hydration) hydration incomplete or not hydration, or casting seas, would seriously reduce the strength of the refractory castable or destroy its structure, so as to affect the use effect.

The nature of combination determines high temperature structural strength of Magnesia Brick

Magnesia brick is widely used in steelmaking furnace lining, ferroalloy furnace, mixed iron furnace, non-ferrous metallurgical industry furnace, building material lime kiln, glass industry regenerative room lattice body because of high temperature performance and strong anti-alkali slag ability. Heat exchanger, refractory industry, high-temperature calcining kiln and tunnel kiln. The refractoriness of magnesia brick is as high as above 2000 ℃, and the softening temperature of the load varies with the melting point of the combined phase and the liquid phase produced at high temperature. General magnesia brick load softening start temperature in the 1520 ~ 1600 ℃, while the high-purity magnesium boast a heavy softening temperature of up to 1800 ℃.
Magnesia  brick at 1000 ~ 1600 ℃ under the linear expansion rate is 1.0% to 2.0%, and approximate or linear, refractory products, the thermal conductivity of magnesium specializes in second only to carbon brick, with the temperature rise reduce. Under the condition of water cooling at 1100 ℃, the number of thermal shock of magnesia brick is only 1 ~ 2 times. MgO brick on the CaO and ferrite alkaline slag resistance, but with SiO2 and other acidic slag resistance is weak, and therefore can not be used in direct contact with the silica bricks, generally separated by a neutral brick. At room temperature, the conductivity of magnesia brick is very low, but at high temperature, its conductivity will not be ignored. The performance of magnesium brick, due to the use of raw materials, production equipment, process measures, etc. have a greater difference. Magnesia brick load softening temperature and the collapse of the beginning of the temperature difference is not much difference between this and the silica brick, because the main phase of magnesium bricks is periclase, but the periclase crystals in the magnesia brick is not crystalline network skeleton, but by the binding of the binder.(http://www.magnesiabricks.com/product/magnesia_brick.html)
Therefore, the nature of the combination determines the high-temperature structural strength of magnesia brick. In common magnesia brick, as the combination is generally calcareous olivine and magnesium rose pyroxene and other low-melting silicate phase, although the magnesia brick constitute the higher melting point of the periclase grain, but at about 1500 ℃ melting Of the silicate phase exists, and its liquid phase viscosity at low temperature is very small, therefore, reflects the deformation of ordinary magnesia brick deformation temperature and collapse temperature difference is not large, but with a greater difference in refractoriness. And the softening start temperature of high-purity magnesia brick can reach 1800 ℃, mainly because the combination between the periclase grains is forsterite or dicalcium silicate, and the melting temperature of eutectic with MgO is high , The lattice strength between the crystal and plastic deformation at high temperature is small, crystal particles with good.

The Advantages of Mullite Insulation Brick

Mullite insulation brick has several advantages:
1. Insulating brick without radiation, green, can be widely used in a variety of public buildings and home interior decoration.
2. The installation of cement, saving a lot of material, manpower and time. Reduce the production of cement combustion caused by air pollution, in line with green low-carbon environmental protection requirements.
3. More than 70 carrier life, 20 years of renovation life long, to adapt to climate and complex environment and other fields. Compared to the international aluminum plate, aluminum veneer and steel hanging plate quality, reduce bearing 30% ~ 90%.(http://www.insulatingbrick.com/product/mullite_insulation_brick.html)
4. Double effect, the general shortened period, the comprehensive cost from 30% to 70%.
5. The comprehensive replacement of aluminum-plastic panels, honeycomb panels, curtain wall and other commonly used decorative materials, multi-functional integration, a construction can solve the insulation decorative two functional requirements, smooth and beautiful decorative strong.
6. Insulating brick high strength, good rigidity, anti-seismic, wind, creep resistance, superior performance, reduce construction load, more economical and durable.
7. Flame-retardant, energy-saving insulation, noise, crack waterproof, energy efficiency requirements by building construction design requirements of 65%.