Silicon carbide based refractory materials

Silicon carbide (SiC) is an artificial mineral, refractory raw materials for the silica and coke, 2000 ℃ above the high temperature electric furnace synthesis, silicon carbide refractory is divided into three categories: (1) plus clay and other oxide-bound products; (2 ) Nitride-bonded products; (3) the use of silicon carbide recrystallization, pressure molding self-bonding products. One of the most common application of clay bonding products, China is currently the production and use of this one.

Carbide as a binder of silicon carbide grade products containing SiC87%, refractoriness up to 1800 ℃, load softening point 1620 ℃. The silicon carbide products have some special properties that make it suitable for certain applications such as (1) its thermal conductivity is about 10 times higher than that of conventional refractory materials and is suitable for use as heat-conducting devices such as heat treatment furnaces Cover. Because of its good thermal conductivity, 1200 ℃ below a strong antioxidant, so the life than the metal cover long. According to the same reason, can also be used as heat exchanger components. (2) mechanical strength, good wear resistance, resistance to rapid cooling hot or good, so some of the roller furnace with it for easy to wear roller sets, the cost is lower than the heat-resistant steel. (3) larger than the resistance, can be used as electric resistance of the furnace.

We are mainly producing high alumina brick, high alumina refractory fire bricks, alkali resistant brick, castable, clay brick, insulation brick, light high alumina brick, low creep high alumina brick, high aluminum wear Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need contact us anytime.

Article Source: Silicon carbide
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Introduction of Calcium Aluminate

The calcium aluminate is also known as pre-melt refining slag or pre-fused alumina slag. The characteristics are as follows:
The chemical composition is uniform, the melting point is low, the melting speed is fast, and the smelting time can be shortened. No fluorine, no erosion furnace lining and ladle;
Free of hydrogen, nitrogen, carbon and other impurities, it is beneficial to improve the quality of steel.
In the case of deoxygenation, it is directly added to the bottom of the bag.The amount of the added weight is determined by the carbon content of the finished steel water, and is generally used for the combination of 4-6kg/1000kg steel.In the first quarter of the steel, the regular added manganese iron, silicon iron, aluminum;After the steel is added to the steel, the steel will be added to manganese and silicon iron, without adding other alloy and aluminum feed line. Using the product to deoxidize, the amount of carbon added (silicon carbide) can be reduced by 30-50%.
In the case of desulphurization, the amount of added in advance use is 1/3, but it must be added to the impact position of bottom steel flow.As the molten steel flows out, the side joins 2/3.Using 6-8kg/1000kg steel, the original sulfur content and the use effect of steel water are determined.
It is mainly used in LF furnace, open hearth furnace, converter ladle refining, remove impurity such as sulfur, oxygen in molten steel, reduce the harmful elements in the steel and the content of impurities, suitable for carbon steel, high carbon steel, high, low alloy steel.
There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information. Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.
Article Source: Thermal conductivity of refractory bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The details of magnesia carbon brick

Magnesia carbon brick is a refractory consisting of MgO at 80-85% or more, with magnesite as the main mineral. The raw material of Magnesia carbon brick is mainly magnesite, the basic component is MgC03, after high temperature calcination into sintered magnesite, and then broken into a certain size after sintering magnesia (also known as metallurgical magnesia). Magnesia is widely used as a furnace material, refractory ramming material, containing less magnesium magnesia, as the manufacture of refractory raw materials of magnesia fire brick. Natural magnesite resources are few, China's reserves and production rank the forefront of the world. Many countries that lack magnesite rely on magnesia made from seawater, and the cost is high.

Magnesia carbon bricks according to their different production processes, divided into two kinds of sintered magnesia and chemical combination of magnesia brick. Sintered magnesia is used to burn, the size of particles with the appropriate proportion of magnesia, adding brine (MgCl2 aqueous solution) and sulfite pulp waste as a binder, press molding, in the 1550-1650 ℃ high temperature firing. In the firing process, the impurities in the magnesite and the addition of liquid phase, the magnesia carbon brick bonded together. And the chemical combination of magnesia carbon brick is not through the firing process, the sintered magnesite according to the proportion of grain with a good amount, adding the right amount of mineralizer and binder, press molding, after drying is finished. Chemical combination of magnesia carbon brick strength is low, the performance is not as good as sintered magnesia, but the price is cheap, less than half the price of sintered magnesia. It is used in the performance requirements are not too high parts, such as heating furnace and soaking furnace bottom.

Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks and other refractory.

Article Source:Magnesia Carbon Brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Cooperation with European client

On 10th, October 2017 our company delivery another 30 tons ladle slide gates to one of our European customers again.

Since last year in June, we have built a long term cooperation with European company. After trail order testing and service supporting, now we supply 60 tons refractory products to them every month.

First we design products according to their furnace and casting condition, then ask engineers to help them to install and test products. Now we are developing more and more European customers, and supply them both refractory products and service.

Article Source:  Cooperation with European client
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Ordinary sintering magnesia brick production process

The firing process usually includes magnesia carbon brick crushing, grinding, grading, batching, mixing, molding, drying and sintering processes.

1) refractory raw material requirements. Chemical composition of sintered magnesia: MgO>87%, CaO = 2.5%, SiO2 = 5%, the appearance of brown or dark brown, dense crystal, good sintering, bulk the density is larger than 3.2g/cm3, igloss <0.3%, in order to ensure the product has good structure, control C/S<0.5.

2) particles should be considered with the most compact principle. The current domestic production of ordinary sintering magnesia brick has various forms according to the actual situation, some using mixed ingredients, the single sieve, the critical particle size 3mm or 2mm, some with three ingredients of 3 ~ 1mm, 1 ~ 0mm, <0.088mm also according to the actual size of refractory brick type and the critical particle size can be enlarged to 6mm, while using four or five ingredients. In order to improve the thermal shock resistance of products, may be appropriate to increase the critical particle size, or by increasing the large particle size. In order to improve the product load softening temperature and sintering, can be increased when the content of fine powder particles, reduce the upper limit.

3) Ingredients. In a factory three ingredients for example: 3 ~ 1mm, 40 ~ 50%; 1 ~ 0mm, 20 ~ 25%; less than or equal to 0.088mm, 30 ~ 35%. binder commonly used sulfite liquor or brine, adding amount of 4% ~ 6%, adding the waste brick, the general should be <20%.

4) Mixed. Usually, in the wet grinding machine in the order of operations: coarse grain - size - bond - fine powder, net mixing time of >15 minutes, mud water <3%, generally do not need trapped material.

5) The magnesia material for forming poor materials, easy molding, blank containing water less, at around 2.5%, low mud plasticity, should adopt high pressure molding, control body density >2.95g/cm3.

6) Dry. Make the body moisture <1%. if not high water content in the body, can take the natural drying, generally >24 hours. If using drying, it generally takes 8 to 12 hours should not be too high, the drying temperature, inlet and outlet temperature control, so as to avoid cracking.

7) Firing. In the heating process will change as follows: out of the water, the generation of liquid phase sintering, particle migration, solid phase reaction, recrystallization, and finally sintering. Strength is increased and the density increases. The firing temperature is generally 1500 to 1600 degrees centigrade.

Article Source: Ordinary sintering magnesia brick production process
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The details of high alumina brick

High alumina brick is containing Al2O3 more than 48% of aluminum silicate products. According to the different composition of minerals, high-quality refractory products are divided into corundum, mullite a just jade and silicon stone three categories. Corundum products, AI2O3 content of more than 95%, the basic mineral corundum (A12O3), raw materials for natural or artificial corundum, but also fused corundum products. The basic mineral of mullite-corundum is mullite (3A12O3.2SiO2), the rest is corundum and glass phase. Silica stone stone raw materials for the sillimanite (Al2O3 · SiO2), the basic minerals are mullite and glass phase. A large number of industrial applications are mullite and silicon wire stone high alumina brick. With the increase of Al2O3 content and the decrease of glass phase, the refractoriness and resistance to rapid cooling of the products are improved, and the resistance to slag resistance, especially for acid slag, is enhanced.
The main raw material of high alumina bricks is high bauxite, which contains minerals such as boehmite, boehmite and kaolinite. The bauxite is calcined and the minerals are converted to corundum and mullite crystals at different temperatures. And in the 1400-1500 ℃ temperature, corundum and quartz combined with the second mullite, crystal growth. In the high-aluminum clinker with soft raw clay as a binder. The production process of high alumina brick and clay brick is basically the same.

Most of the performance of high alumina brick is better than refractory fire brick, but the thermal stability is slightly lower than clay brick. With the different content of Al2O3, ordinary high alumina brick is divided into three grades: (LZ) -65, (LZ) -55, (LZ) -48.

As the main component of high alumina brick AL2O3 is an amphoteric oxide, acid and alkaline slag erosion can resist the erosion of iron oxide skin also have a certain resistance. It is often used to build the soaking furnace bottom, the lower furnace wall, the exhaust outlet at the vault, in the continuous heating furnace, the bottom of the furnace wall, burner brick, ceiling can be used high aluminum brick masonry. High aluminum bricks are also commonly used as lattice bricks, repairing thermal storage rooms.

High alumina brick in the industrial advanced countries, the proportion of total refractory materials is about 8-14%, China's high alumina bauxite rich resources for the development of high alumina brick to create favorable conditions.

Article Source: Generality High Alumina Brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/