Construction of Converter Refractories

The converter is an upright cylindrical smelting furnace that does not require an external heating source and mainly uses liquid pig iron as a refractory raw material for steel making. According to the nature of the furnace lining refractory, it is divided into two types: acid converter and alkaline converter. According to the part of the gas blown into the furnace, it is divided into a bottom blowing, a top blowing, a side blowing and a top-bottom composite blowing converter. Bottom blowing, top and bottom composite blowing converter bottom design breathable fire bricks. When laying, you need to locate the position of the ventilation bricks. The bottom blowing and side blowing blowing furnace bottoms are not designed with ventilated bricks, and the bottom of the furnace is relatively simple.
According to the bottom drawing of the converter, the production of magnesia carbon bricks for the bottom of the furnace is arranged, and each type of brick is used for production. The center brick of the bottom is processed bricks. According to the physical and chemical indicators of the design materials, the appropriate magnesia carbon bricks are selected for bonding processing. After processing, the cross reference line shall be drawn on the plane of the upper part of the center brick to provide a reference for positioning the ventilating bricks in the subsequent pre-laying and determining the position of the steel side and the steel side.
Breathable bricks need to be pre-made models. The model is generally made of wood. If the size is too small, it can be replaced by other refractory materials such as magnesia carbon brick. When processing ventilated bricks, special attention should be paid to technical indicators such as slightness, diagonal difference, and distortion. The dimensional deviation of the permeable brick directly affects the masonry of the steel mill. When making a ventilated brick mold, the dimensional tolerance should be controlled as a negative rule as much as possible. If it is a square rule, the steel factory may have a large gap around the ventilated brick.
In addition to the above refractory materials, it is also necessary to prepare sand at the bottom of the furnace (3mm-1mm), grinding tools, cutting machines, rubber hammers and other auxiliary materials.
Article Source:Construction of converter refractories
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Construction of fire plastic material

The construction quality of fire plastic refractory raw material affects the service life of the furnace directly. When doing construction on the top of the furnace, if the construction is improper, accidents such as roof vault or roof collapse will occur. Therefore, fire plastics refractory raw material must be constructed as follows:

1.Combining fire plastic material and anchor bricks;

2.When the first layer of refractory raw material is hammered, shave the surface of plastic material with a scraper so that the bonding surface is rough; then place the second layer of plastic material and hammered in the same way;

3.Cut the expansion joint according to the design requirements;

4.Lay holes in the plastic refractory raw material after construction.

Changxing refractory 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 products.

Article Source：Construction of fire plastic material
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Reasons for mesh cracking of high alumina bricks

In addition, high alumina bricks on the surface of the network cracks generated in the gap between the brick brick surface. Therefore, it can be inferred that when the excess air coefficient in the kiln is small or the reducing atmosphere is generated, the CO is easy to be retained in these places due to the smaller slit, so that the Fe2O3 in the product is reduced to FeO; the surface of the channel is smooth , So it will not be affected by changes in the atmosphere, no network cracks. It is important to note that frequent changes in the nature of the combustion atmosphere should be avoided during the firing process. So that this alternating change will cause the surface to be damaged.
The chemical analysis of the surface and the central part of the products with high surface cracks in the surface of the high alumina refractory bricks shows that the Al2O3 on the brick surface is 1% -2% higher than the central part and the SiO2 is 1% -2% Center more than 10 times higher. It was found that the content of mullite was 12% lower than that of the central part, 4% -5% in corundum and 7% -8% in glass. This indicates that during the migration of Na2O, Na + volatilizes and adsorbs on the surface of high alumina brick, which will promote the decomposition of mullite, reduce the mullite on the surface of the product, and increase the corundum and glass phases. As the surface of the liquid phase increased and early appearance, so that the brick surface premature contraction, resulting in the production of reticulation.
Practice shows that in order to avoid and reduce the high aluminum brick surface network cracks, 1.2. High bauxite clinker water absorption were controlled at 4% -5% below, the tube of water absorption should also be controlled at 5.5 % Below, the excess air coefficient control between 1.1-1.2 is appropriate, so that high alumina brick firing in a stable weak atmosphere.
Xinmi Changxing furnace refractory Tips: You may also on the refractory fire brick, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.
Article Source: refractory fire brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
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How to distinguish the quality of high alumina bricks

High alumina brick is mainly used in lining of blast furnace, hot blast stove, furnace top, blast furnace, reverberatory furnace and rotary kiln. In addition, high alumina brick is also widely used as the open - hearth furnace, pouring system plug, water - mouth brick, etc.

It is featured by good quality, high refractoriness, long service life, and it is the most widely used by the industrial furnace. As the quality of it deters the service life of furnace, it’s very important to distinguish the prime and common one, the following can be referred to choose the good high alumina bricks.

Firstly, color is important for high alumina bricks, the prime one has smooth apprearance, it’s yellow white, the four sides are flat, with no broken corners and no cracks.

Secondly, it’s better to weigh, on average, the weight of the first grade is about 4.5kg and the second grade is 4.2kg, the third grade is 3.9kg.
In all, hope those is helpful to choose the prime generality high alumina brick as per your application.

Article Source: How to distinguish the quality of high alumina bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The reason of crack mesh high alumina brick

Changxing refractory shows the reasons for the high alumina refractory bricks to produce reticular cracks. It is reported that high alumina bricks often appear on the surface of the crack is the production of high alumina brick defects, the reasons for this network cracks often quite complicated. For example, the clinker content (especially R2O content), the amount of fine powder added, the critical particle size, the mixing quality of the clay, the humidity and the temperature of the green body, the shrinkage of the green body during the firing, Mulli petrochemical reaction and corundum recrystallization, etc., will lead to the surface of the refractory product produced reticulate. The sintering of high alumina brick is liquid phase sintering, the formation temperature of liquid phase and the amount of liquid phase, the firing conditions of the atmosphere is also an important factor in the surface network cracks.
The sintering degree and firing atmosphere of high alumina bricks and the volatiles present in the gas phase have a great influence on the surface crack of high aluminum products. Sintered bad clinker in the process of burning products continue to shrink, causing the product cracking and crack; at the same time sintering bad clinker, the second Mulli Petrochemical is not sufficient, in the process of burning products, clinker itself Mullerite is still continuing, which is caused by inconsistencies in the product of an internal factor, resulting in the number of products increased the number of cracks and the increase in the degree of cracking.
High-aluminum refractory products on the surface of the degree of mesh cracking with the clinker used in the water absorption is closely related. The greater the water absorption of clinker, the greater the degree of reticulation. When the clinker with the water absorption rate, the product in the firing process clinker itself to continue to complete the sintering process, products shrink larger, and uneven, and thus prone to cracking and reticulation. In addition, the firing atmosphere of the kiln is one of the causes of the network cracks in the high aluminum products. When the high aluminum products are fired, the atmosphere of the kilns is weakly oxidized and the excess air coefficient is controlled at 1.1-1.2. The practice shows that the surface cracks Excess air coefficient increases and decreases, but the excess coefficient of air fluctuations should not be too large.
Changxing refractory are mainly producing high alumina brick, high alumina refractory 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 please contact us anytime.
Article Source: refractory fire brick
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/

Characteristics of mould fluxes

Mould fluxes is a kind of refractory material that is put on the molten steel level to be thermal insulation,anti oxidation and absorption of non-metallic inclusions in the process of continuous casting.

The basic function of mould fluxes: Protecting the mould steel liquid from the two oxidation of air； Having good spreadability and insulation performance, prevent molten steel solidification or crus; Well absorbing the floating non metallic inclusion;Controlling the speed and uniformity of heat transmission from billet to crystallizer to reduce the thermal stress; Having good lubrication function for billet.

The product of our company is designed and produced according to parameter of continuous caster and detailed production situation, which has good melting property and steady quality, and is suitable for different casting conditions. It can ensure the clean and smooth surface of casting block, and also can ensue that there is no shell and flux strip in mold, with even whip mark an without defect on he surface of casting block.There have many kinds of refractory products in our factory.Such as fire brick ,refractory raw materials ,refractory nozzle .When you want to know more kinds of refractory products ,welcome to view our website to know more.
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