Do You Know the Difference between High Alumina Bricks and High Alumina Castables?

High alumina bricks and high alumina castables are both commonly used refractory materials and can be used in the construction of high-temperature industrial kilns. The common feature of both of them is that they contain a large amount of Al2O3 in their composition, and both of them can resist high-temperature erosion. But the difference between the two is still very big. So what are the differences between high alumina bricks and high alumina castables? As an experienced refractory material manufacturer, Rongsheng Refractory Materials Manufacturer has accumulated rich experience in high alumina bricks and high alumina castables.

High Alumina Bricks Lining

The Difference between High Alumina Bricks and High Alumina Castables

1. Different forms

High alumina bricks are shaped refractory materials. It has a fixed shape and size. The general standard refractory brick size is 230*114*65mm. High aluminum castables are unshaped refractory materials. It has no fixed shape, generally exists in powder form, and is usually stored in bags.

2. Different production methods

The main production method of high alumina bricks is to form the well-proportioned raw materials through high pressure and then sinter them at high temperatures to form a fixed shape. The production method of high-aluminum castables eliminates the need for high-temperature sintering and high-pressure molding. It is directly bagged after the raw materials are proportioned.

3. Different construction methods

High alumina bricks can be used directly during construction, and usually need to be used with high-temperature cement during use. High-aluminum castables need to be stirred by adding water, then poured into a fixed mold, and then air-dried and shaped. After finalization, the entire kiln needs to be baked before it can be put into use.

High Alumina Castable Lining

The difference between high alumina bricks and high alumina castables. Among them, the biggest difference between the two is still in the form, one is in a fixed shape and the other is in powder form. Although both can be used as masonry for kilns, for some occasions with special shapes and difficult construction, the construction difficulty of castables is obviously lower than that of high alumina bricks.

How to Choose High Aluminum Castables?

We all know that high-aluminum castable is a refractory castable with relatively high alumina content. It is widely used in the construction of high-temperature kilns. It has the characteristics of superior fire resistance, high-temperature resistance, corrosion resistance, and oxidation resistance. Therefore, the range and frequency of use are very high. But it is very important for us to choose good high-aluminum castables when purchasing. Its quality determines the service life of the high-temperature kiln and the quality of the materials smelted during use.

First of all, we need to know that high-aluminum castables are composed of aluminates, silicates, oxides, etc. In order to ensure the effect in a high-temperature environment, we must strictly follow the requirements when proportioning raw materials. Incorrect raw material ratio will seriously affect the performance of the entire castable. Therefore, we need to confirm with the manufacturer’s technical personnel when purchasing and inform the technical personnel according to the occasion of use. Technicians will provide you with a variety of options based on your usage situation.

How to Choose High-Aluminum Castables

Secondly, we mainly look at the following aspects that affect the quality of high-aluminum castables during use. Including compressive strength, thermal stability, thermal conductivity, thermal expansion coefficient, etc. The testing agencies of these manufacturers will issue reports when they submit them for inspection, so we must ask the manufacturers for the inspection report when purchasing. From the report we will get some parameters we want if the parameters meet the standards or are above the standard line. It shows that the quality of high aluminum castable is good.

Also, when we purchase high-aluminum castables if the above two aspects meet the standards, we can first purchase some samples from the manufacturer for experiments. This can ensure to the greatest extent an effect on our future use. If the experiment is qualified, it will not be too late for us to purchase in large quantities. If we make large-volume purchases without conducting experiments in the early stage, our losses will be very large. This will not only be the cost of raw materials, but also our entire kiln may need to be reconstructed.

Everyone must know how to choose high-aluminum castables with good results. Finally, when purchasing, we must consider the overall cost and performance. In addition to considering various indicators of raw materials, understanding the manufacturer, brand, and market reputation of the product is also one of the important factors in ensuring the selection of high-quality high-aluminum castables.

In addition to the methods mentioned above, we also need to pay attention to the following points when purchasing high-aluminum castables. First of all, we must choose high-aluminum castables produced by regular manufacturers, so as to ensure the quality and performance of the product. Secondly, pay attention to the packaging method of high-aluminum castables. Generally speaking, the packaging should be tight and there should be no damage or air leakage to prevent the product from being damaged during transportation. In addition, carefully check the production date and shelf life of the product, and choose products with a recent production date and a longer shelf life to ensure product quality and performance. Finally, you should consult the manufacturer’s after-sales service to understand the after-sales guarantee and technical support of the product, so that you can get timely help and support if problems arise during use. By comprehensively considering the above factors, selecting high-aluminum castables with excellent performance and reliable quality can provide a strong guarantee for the construction of high-temperature kilns and the production of smelting materials.

High Alumina Bricks for Tunnel Kiln Trucks

High alumina bricks used in tunnel kilns and kilns are generally high alumina bricks with an aluminum content of more than 70%. Brick dimensions must be negative. This is because during production and operation, as the temperature changes, the high alumina bricks will expand. If it has been used for a long time, the joint material will loosen, which will also cause the bricks to hit the kiln wall. What should I do if the high-alumina bricks used for tunnel kiln trucks hit the kiln wall on both sides?

Grade I – High Alumina Brick For Sale

The phenomenon of high alumina bricks hitting the kiln wall is caused by many factors. First, the kiln car bricks have been used for a long time, and the joints of the refractory clay or refractory cotton are worn out, causing the gaps to increase and cause them to hit the kiln wall. Second, the size of the high alumina bricks is positive. When the size of the kiln car bricks is increased during construction, the bricks may also hit the kiln wall during the production process.

If the high alumina bricks used for kiln cars are of regular size or increased in size, the total length of the paved kiln car bricks will increase. During the movement, the kiln car will collapse if it hits the kiln wall, and the products from the collapsed parking space will fall and become blocked in the kiln. As a result, the kiln cars that circulated behind were also blocked and collapsed, making production impossible. In this case, first measure the total length of the kiln car. The total length of the kiln car must be about 6cm shorter than the kiln length, that is, one side is about 3cm shorter. Only in this way, during the production process, if the kiln car’s high-alumina bricks expand at high temperatures, production will not be affected.

But if the total length of the kiln car is longer than the kiln diameter, it must be dealt with. After laying the kiln car bricks, you can use an angle grinder to knock off about 3cm of the bricks and make them smooth on both sides. If high-alumina bricks for kiln cars that are too long are used, they must be dismantled and re-paved. Because the joint materials under high temperatures, such as fire clay, have fallen off, the joints between bricks have increased, resulting in an increase in the total length of the kiln car bricks, affecting use.

Kiln cars are paved with high-alumina bricks, and each manufacturer has different habits. Some are built from the middle seam to both sides. Some are the manufacturer’s own bricks, which can be paved according to the size of their own high-alumina bricks. As long as the total length does not exceed the kiln diameter, they can be used. Do not smash pavement tiles that are too long. Hitting them with a hammer will cause the tiles to break. Try to use an angle grinder to grind it, so as not to cause the high alumina bricks of the kiln car to break or cause the bricks inside to break. It’s just that the edges don’t look good after being polished, and it doesn’t affect use at all.

To buy high-quality high alumina brick refractory bricks, contact us to get free samples and competitive prices.