High Alumina Bricks for Steel Coking Furnaces

As a large-scale high-temperature industrial equipment, steel coking furnaces have to carry melting furnace temperatures up to a thousand degrees, so it is very necessary to use necessary furnace body refractory and heat-insulating protection materials. For steel coking furnaces, many manufacturers choose high-alumina bricks as raw materials for construction and maintenance.

RS High Alumina Bricks

High Alumina Bricks for Steel Coking Ovens

High alumina bricks include lightweight high alumina bricks and dense high alumina bricks. So which one should be used in a steel coking furnace?

In fact, in steel coke ovens and other industrial kilns, light and dense high alumina bricks are mostly used in combination. Because they have different characteristics and functions, using only one of them cannot fully meet the refractory insulation effect required by the kiln. Therefore, large manufacturers purchase these two materials for construction.

The main feature of lightweight high-alumina bricks is thermal insulation, which can be used as the outer layer close to the furnace wall. This can not only ensure the effective utilization of the heat energy of the equipment but also prevent deflagration caused by high heat conduction. Dense high-alumina bricks are used in the furnace in contact with the flame. This refractory material is pressed and calcined at a high temperature of 1775°C. It has strong heat resistance, high-temperature resistance, and corrosion resistance. It will not deform or fall off under high heat conditions for a long time.

Lightweight high-alumina bricks and dense-weight high-alumina bricks each have their own strengths and weaknesses. The two are laid according to the different positions and required functions of the kiln so that the service life of the equipment can be extended and the safety production level can be improved.

Lightweight High-Alumina Insulation Bricks

What is the Difference between Refractory Bricks and Insulating Bricks?

Refractory bricks and insulation bricks are both building materials products. However, there are some differences in the main application fields and uses. Many users often compare the two when choosing products. Below we will learn about their differences through different aspects.

1. Insulation performance.

The thermal conductivity of insulation bricks is generally 0.2-0.4w/m·k (average temperature 350±25℃). The thermal conductivity of refractory bricks is above 1.0w/m·k (average temperature 350±25℃). It can be concluded that the thermal insulation performance of lightweight insulation bricks is better.

2. Refractory resistance.

The fire resistance of insulation bricks is generally below 1400 degrees. The refractory degree of dense refractory bricks is above 1400 degrees.

3. Density.

Insulation bricks are generally lightweight insulation materials with a density between 0.8-1.0g/cm3. The density of dense refractory bricks is basically above 2.0g/cm3.

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The Mulliteization of Low-Grade Low-Creep High-Alumina Bricks

The main crystal phases of low-creep high-alumina refractories are mullite and corundum phases. Different ways of mullite chemical reactions occur during the firing of products, and these mullite chemical behaviors must be rationally designed and controlled. Only by controlling the mullite chemical reaction in the production of high alumina bricks can high-quality low creep high alumina bricks be produced.

Low Creep High-Alumina Bricks from Rongsheng Factory

The creep temperature of low-grade low-creep high-alumina bricks is generally 1200~1350℃, and these products can be produced entirely with bauxite clinker.

Research on the basic high-temperature creep properties of alumina materials shows that the creep resistance is related to the alumina content of the material, and the order of its superiority and inferiority is grade II > grade I > grade III. The excellent creep resistance of grade II bauxite depends on its columnar mullite network structure. But in fact, it is difficult to produce low-creep bricks with bauxite clinker such as grade II calcined by the block method. The reason is not only the poor sintering degree of bauxite clinker but also the uneven chemical composition of bauxite clinker such as grade II.

Figure 1 photo of the microstructure of bauxite clinker (left) & Table 1 chemical composition of the dense area (right)

Figure 1 is a photo of the microstructure of bauxite clinker such as grade II. The chemical composition of the dense area on the upper left and the loose area on the lower right is quite different (see Table 1). That is to say, a considerable part of this type of II material is actually an inhomogeneous mixture of grade I and grade III materials. As a result, the raw material itself undergoes mulliteization reaction (between particles and fine powder, between fine powder and fine powder) during the firing process, and is accompanied by volume expansion. As a result, the porosity of the product after firing is relatively high, and other physical properties are reduced. Therefore, a bauxite clinker such as grade II is used to prepare low creep bricks. First, select raw materials with a better sintering degree (water absorption rate of 3~6%) to strengthen process control. For example, increase the fineness of the fine powder and extend the burning time to reduce the expansion effect of mullite and produce high-quality low-creep bricks.

When using alumina materials such as grade III to make low-creep high-alumina bricks, in order to improve the creep resistance, some alumina materials such as I or II can be added to the matrix. The alumina content of the matrix should be close to the alumina content of the mullite composition, and not exceed the mullite composition.

How to Produce High-Quality Low-Creep High-Alumina Bricks?

According to the different mullite chemical behaviors of the raw materials for producing low creep high alumina bricks, different low creep high alumina brick production processes are reasonably designed to control these different mullite chemical processes. These materials can be divided into two categories. One type makes the mullite chemical reaction fully and completely, and the mullite grains can develop and grow. Such as low-creep high-alumina bricks produced by all bauxite clinker, and low-creep high-alumina bricks produced with kyanite. The other type makes its mullite petrochemical partial reaction. Such as adding sillimanite, low creep high alumina bricks produced by adding silica. Controlling the expansion of products during firing is an important part of the brick-making process.

To purchase high-quality low-creep high-alumina bricks and high-alumina bricks (https://cheapfirebricks.com/high-alumina-bricks/), please contact the refractory brick manufacturer.

The Way To Use High Alumina Bricks

When you are by using a furnace or perhaps in another high heat application you are going to want to use high alumina bricks. These bricks offer superior heat protection and so they stay longer than regular bricks. The bricks are going to last for a long time without needing any problems and so they are one of the best bricks you may use when you need to use high heat applications.

If you want to buy https://cheapfirebricks.com/high-alumina-bricks/ you might have to do plenty of research so do you know what the least expensive pricing is and also you don’t spend excessive money to the bricks. Should you do your research you can get some good deals on the bricks and you can maintain stocks of them.

Alumina bricks are prepared for a lot of heat and are generally gonna give your very best in the furnace to absorb heat to get your job done faster. The bricks will certainly help your projects be a little more efficient plus they are very simple to use. If you are looking for quality bricks that will work tirelessly to suit your needs, you need to ensure how the bricks are durable and they are priced right.

Quality bricks could make your daily life better and you will always employ the very best quality bricks you could afford. A good place to get the bricks is usually to use the web. You will find the most effective prices internet and there are many different places to look from. Looking for the bricks doesn’t must be difficult when you find yourself shopping on the web and you could usually find the appropriate bricks that will help you run your small business better. Browse here: https://cheapfirebricks.com/

The best bricks will assist you with your kiln and are generally going to ensure that you take advantage money. In the event you are employed in any kind of situation where you need to deal with extremely high heat you will want to get top quality alumina bricks so your furnace absorbs heat correctly.

These bricks can create a big difference in the manner you work and so they could save you money and they will help your organization be more successful. When you need quality bricks and want to make sure that you put money into the best bricks so you find yourself with quality bricks which will assist you in making more income. The greater money you will make the higher and you also have to be sure that you are purchasing the correct alumina bricks.

The bricks are super easy to use and you may get a lots of mileage away from them. They will last for a long period and they are generally intending to make life easier since you can rapidly set them up. Alumina bricks helps keep your kiln and furnace safer and they are going to make sure that your furnace isn’t gonna crack and that it must be gonna last longer without problems.

Exactly Why Are High-Alumina Bricks Superior To Fireclay Bricks?

When looking for refractory bricks, two common types that you could come across include fireclay bricks and https://cheapfirebricks.com/high-alumina-bricks/. It is essential to be aware of the difference between those two products. That way, you may be better informed when deciding which of them to purchase.

As a general rule of thumb, high-alumina bricks are regarded as superior to https://cheapfirebricks.com/fire-clay-bricks/. There are a variety of numerous main reasons why they can be an excellent product.

Both kinds of bricks are created with aluminum oxide. The principal difference is the fact high-alumina bricks have a higher amount of aluminum oxide than standard fireclay bricks. This extra aluminum oxide provides numerous benefits.

To begin with, it improves the ability in the bricks to withstand higher temperatures. High-alumina bricks have a higher refractoriness under load (RUL) rating than fireclay bricks. That means that these are not as likely to shrink or become deformed when in contact with high temperatures. Even though both kinds of bricks do a good job of standing upright to heat, there are specific applications where high-alumina bricks can be a better option.

Oftentimes, the two types of bricks are employed along with one other. As an example, furnaces may use a combination of both fireclay bricks and high-alumina bricks, based on in which the bricks are situated throughout the furnace. Areas that experience exceptionally high heat loads will use high-alumina bricks while people who are in contact with less heat uses standard fireclay bricks.

Another area where high-alumina bricks outperform fireclay bricks is remarkable ability to resist acids and bases. Bricks that include higher percentages of aluminum oxide usually have a neutral pH value. Because of this, these are unlikely to react with either acids or bases.

Fireclay bricks, on the other hand, are typically slightly acidic. While they conduct a good job of standing upright to acids, these are less efficient when open to basic substances. Consequently, high-alumina bricks really are a better option for basic environments.

There are actually certain areas where fireclay bricks outperform high-alumina bricks, however. As an example, bricks produced from standard fireclay are better capable to resist thermal shock than bricks which are made using extra aluminum oxide. Additionally, they have a tendency to be expensive less, causing them to be a spending budget-friendly option.

Most of the time, however, high-alumina bricks far outperform fireclay bricks. They are not only more unlikely to shrink or warp when in contact with heat but they also are less likely to get damaged when they are subjected to acids or bases.

Naturally, when selecting refractory bricks, you need to take into consideration the way that they will work for your specific situation. If you aren’t sure which bricks are the best choice for the application, it is worth speaking to an expert. Talk with a manufacturer or supplier who carries refractory materials to obtain advice and input where types of bricks you need to purchase. Chances are, among their experts could be more than happy to assist you to select the best bricks for whatever project you happen to be concentrating on. Read more on this page: cheapfirebricks.com

Good Uses Of High Alumina Bricks For Furnace

High alumina refractory bricks, also known as high alumina brick, and its production and stickers brick production process is similar to the difference is more with high-alumina clinker powder, refractoriness than clay brick, anti-acid and alkali resistance candle better performance It is used in various kiln firing zones.

Al2O3 content of more than 48% of the aluminum silicate refractory bricks are collectively referred to as high alumina refractory bricks. (Al2O3 is 60% ~ 75%); Ⅲ and so on (Al2O3 is 48% ~ 60%). The Al2O3 content is divided into three grades: I and so on (Al2O3> 75%); According to the mineral composition can be divided into: low mullite (including sillimanite) and mullite (Al2O3 for 48% ~ 71.8%), mullite – corundum and corundum – 71.8% ~ 95%), corundum (Al2O3 95% ~ 100%) and other refractory bricks.

With the increase in Al2O3 content in https://cheapfirebricks.com/high-alumina-bricks, the number of mullite and corundum components also increased, the glass phase decreased, the fire resistance of high alumina refractory bricks and the density of refractory bricks also increased. When the Al2O3 content in the high alumina brick is less than 71.8%, the only high temperature stable crystalline phase in the high alumina refractory brick is mullite and increases with the Al2O3 content. The high – temperature stabilized crystal phase with high content of Al2O3 is more than 71.8%. With the increase of 71.8%, the amount of corundum is increased and the mullite is reduced, and the high temperature performance of high alumina refractory bricks is improved accordingly.

The firing temperature of these bricks depends on the sintering properties of the alumina raw materials. With the special grade and I grade bauxite clinker (volume density ≥2.80g / cm3), the raw material structure is uniform, the content of impurities is high, so that the green body is easy to sinter, but the firing temperature range is narrow, Undercooled. The use of II bauxite clinker (bulk density ≥ 2.55g / cm3), due to the second mullite caused by the expansion and loosening effect, so that the green body is not easy to sintering, so the firing temperature is slightly higher. When the grade III bauxite clinker (volume density ≥2.45g / cm3) is used, the structure is dense, the content of Al2O3 is low and the firing temperature is low, which is generally slightly higher than 30 ~ 50 ℃ of the firing temperature of clinker clay brick. High aluminum refractory bricks are fired in oxidized flame.

As the high aluminum refractories load softening temperature is an important property. The experimental results show that it changes with the change of Al2O3 content in high alumina refractory bricks. You can learn about the use of high alumina bricks from the professional manufacturer.

When the content of Al2O3 is lower than that of mullite, the equilibrium phase of high alumina refractory brick is mullite – glass phase. The content of mullite increased with the increase of Al2O3 content, and the softening temperature of the load increased accordingly.

High aluminum brick thermal shock resistance than clay brick, 850 ℃ water cycle 3 to 5 times. Mainly due to the thermal expansion of corundum than mullite high, and no crystal conversion. And Ⅰ, Ⅱ and other high-alumina brick thermal shock resistance than the other high-alumina refractory brick. Find more fire bricks from https://cheapfirebricks.com.