What are the factors that affect the performance of refractory castables?

There are many factors that affect the performance of refractory castables, and here I will share a technical summary made by Four Seasons Fire Refractory for your reference, I hope it will help you.

1. Construction environment temperature.

After the selection of refractory castable meets the required standards, the conditions of the construction environment are related to the quality of the finished product, there are many precautions for the use of refractory castable, for the temperature of construction, if the temperature is high, it is necessary to use shading light to ensure quality, when the temperature is low, adjust the temperature of the water under the condition of ensuring that the material is initially solidified normally, stir the refractory castable with hot water at a higher temperature, and the water needs to be weakly acidic.

2. Construction site conditions.

As the main place for material processing, the environment and facilities of the construction site have a great impact on the construction. First of all, the construction ground must be flat, and there must be no mud, sand, lime, clinker ore slag, etc. in the mixing site, and secondly, the equipment for storing and treating water must be clean, so that the advantages of refractory castable can be brought into play while ensuring the quality of the finished product.

3. Stirring process.

Mixing is an important step in construction, and whether the operation specification is related to the quality of the finished product is also a precaution for refractory castables. If the vibrating rod effect of the material is poor in the vibration process, it will aggravate the formation of pores, and increase its density, and in the stirring process, if too much water is added, the material will be formed with large fluidity, and the bearing capacity will be reduced after molding.

Different types of refractory castables have corresponding dimensions and are suitable for different industrial furnace construction environments. The construction specification of refractory castable is related to the quality of the product, and the main goal is to control the factors in the construction process well, and to improve the construction efficiency and the quality of the finished product by using the advantages of refractory castable. The above is a technical summary of Zhengzhou Four Seasons Fire Refractory Materials, I hope it can help you.

construction environment, humidity, temperature.

Water added during construction, mixer mixing time, vibrating rod vibration, maintenance during reaction, post-demoulding, baking time, baking speed. Each link will affect the use of castable.

The addition of large amounts of water will cause the material to be diluted, the flow will be large, and the strength of the material will decrease after the reaction.

The short stirring time will cause uneven material, uneven dry-wet ratio, and bad vibration of the vibrating rod, which will cause the castable to be not compact. The porosity is large, and there are holes, etc.

The baking speed is fast, which will cause a large thermal expansion and cold contraction reaction, explosion, etc.

Summary. The following is my question for your [composition of refractory castable]: Hello, <> kiss!

The composition of refractory castables is as follows: ultrafine powder, cement, silicon, and aluminum sol, and the use of these materials is special, so it should be used with caution. If it is divided according to the way of construction, it can be divided into self-flowing type and vibration construction type, and according to its material composition, it can also be divided into ultra-low cement, low cement, cement-free, and ordinary refractory castables.

The following is my question for your [composition of refractory castable]: Hello, <> kiss! The composition of the refractory state macro castable is as follows:

There are super-registered micropowder, cement, silicon, and aluminum sol, and the use of these materials is special, so it should be used with caution. If it is divided according to the way of construction, it can be divided into self-flowing type and vibration construction type, and can also be divided into ultra-low cement, low cement, cement-free and ordinary refractory castable according to its material composition.

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The main component of refractory castable is the basic detection of physical and chemical indicators of refractory castable, in the analysis of the composition of refractory slag skin castable, we have talked about the main component of refractory castable, which is the main body of refractory castable, and is the basic and absolute foundation condition that directly determines the refractory performance of refractory raw materials. The composition of refractory castables is divided into main and secondary components, and the basic components that play a major role in the majority are usually called the main components, and the accompanying inclusions in the raw materials and the addition of the process are called the secondary components. For example, high-alumina castables, the main component is aluminum oxide; For example, siliceous castable, the main component is silica, which is an acid refractory castable; Magnesia castable, the main component is magnesium oxide, and so on.

Construction requirements for refractory castables.

1. Preparation. Before construction, it is necessary to check the integrity and cleanliness of the mixing equipment, transportation tools, vibrating tools and the parts to be poured; Check the formwork, surrounding refractory bricks and insulation layers for water loss prevention measures; Check the form, size, layout, welding quality of the equipment and the expansion compensation measures of the metal anchors for the form, size, and anchor bricks; Check whether the quality of the castable and the construction water meet the requirements. In addition, during the construction of the castable, it is necessary to ensure that the power is not interrupted and the construction is not interrupted.

Among them, the formwork for castable construction is made of material that does not absorb water. If the wooden formwork is used, the waterproof layer should be brushed to prevent the castable from losing water. After water loss, the fluidity of the castable is reduced, and it is difficult to drain the bubbles and vibrate compact.

The steel formwork should be coated with a release agent to prevent the formwork from sticking to the castable. When reusing, the template should be cleaned first, then brushed with oil, and then used.

2. Stir. A compulsory mixer should be used for mixing. The mixer needs to be cleaned in advance and rinsed with water, and no lime, sediment, Portland cement and other sundries.

If superphosphate-bonded amorphous materials are mixed, the equipment must be thoroughly cleaned before it can be used to mix cement-bonded castables.

According to the size of the mixer and the construction situation, the amount of each mixing should not exceed 200kg. In the case of the specified water consumption, the mixed castable must be made to achieve sufficient fluidity.

Pour the components of the castable into the mixer, dry mix for 3min, and then add clean tap water. When adding, 90% of the reference water added to the castable is added first, and then the remaining water is slowly added to make the fluidity of the slurry meet the requirements, and the wet mixing time shall not be less than 5min.

Castables must be used in whole cylinders and bags. The stirred castable should be poured quickly, and it must be used up within 30min from the time of adding water. The wet material that has been initially set must not be reluctantly formed, and cannot be stirred with water again for reuse, and must be discarded.

Castable.

How to use castable:

1. When pouring ladles, the quality of the ladle and the number of load-bearing times should be tested many times, whether it is the crane high-temperature castable ladle or the portable ladle, it should be checked once every 2 months, and the important parts should be checked for cracks, deformation, expansion and so on.

2. Mix the castable with a mixer, pour the castable into the stirring first, and add the coagulation dose of 5-3%. Depending on the hardening time to adjust, the temperature at 25 o'clock in autumn can be increased by 5%, if the temperature of the construction site is at 30, 3% can be added, and the time must be grasped to reduce the loss during construction, and the pouring must be poured to the specified part until completion.

3. The actual operation of the castable is mainly stirred by the mixer, and manual mixing is prohibited. However, the ground must be clean, the castable should be added with a coagulant, and the amount of coagulant added is 3%, which on-site construction can add 5% and then add 8% PA80 glue to mix quickly to ensure that it is used up within 10 minutes.

4. Before pouring, first do a good job of coating the anchor solid with a layer of asphalt and paint, when the pouring thickness is within 250mm, it is advisable to pour to the specified thickness at one time, and vibrate until it is dense and completely compact.

5. The mold must be cleaned before the mold, and the mold should be coated with a layer of oil to carry out the mold.

6. In winter construction, salt or other substances are added as antifreeze agents, which reduces the high-temperature performance of the material, or reasonable antifreeze measures are not taken during winter construction.

It is recommended to use a compulsory mixer for castable mixing, and all mixing tools and mixers must be clean and free of debris.

The main purpose of refractory castable is the lining construction of boiler, generally in the parts that are eroded by molten iron, molten steel and slag and the working temperature is higher, such as tapping trough, steel barrel and blast furnace furnace body, taphole trench, etc., refractory castable made of granular and powdery material with high alumina content and good sintering can be used by low calcium and pure high alumina and low cement.

Refractory castables are essential consumables for industrial furnaces. The main uses are as follows:

Pouring and molding of key parts of the furnace body, such as near the furnace door frame and feeding port.

The molten metal pouring runner is generally cast with castable, and after a period of use, the castable will fall off and need to be repaired regularly.

What is a refractory castable? Refractory castable is an amorphous refractory material, which is mainly used in the interior of the building to create the internal structure of the building, and is a building material that can prevent fire. In some areas where the weather is hot, refractory castables are generally used to make buildings.

Refractory castables are not easy to deform, and the temperature change is not too high, the basic principle is that the temperature will not rise. The following is an introduction to the ** and characteristics of refractory castables.

I. **

The price is generally about 1000 yuan, and some of the better ones are 2700 yuan a ton, almost less than 500 yuan, and these ** will also be affected by the material, not necessarily low is not a good product, this **** in the network, for your reference only.

Second, technical characteristics

Refractory castable is one of the most widely produced and used amorphous refractories. It is mainly used for the construction of various heating furnace linings and other overall structures. Certain high-quality varieties can also be used in smelting furnaces.

For example, aluminate cement refractory castable can be widely used in various heating furnaces and other thermal equipment without slag and acid and alkali erosion. In the parts that are eroded by molten iron, molten steel and slag and have a high working temperature, such as tapping troughs, steel barrels, blast furnace furnace bodies, taphole trenches, etc., refractory castables made of high-quality granular and powdery materials with high alumina content and good sintering can be used by combining low calcium and pure high-alumina cement.

For example, phosphate refractory castable can be widely used in heating furnaces and soaking furnaces for heating metals, and can also be used in coke ovens and cement kilns in direct contact with materials. In some parts of metallurgical furnaces and other vessels that are in direct contact with slag and molten metal, the use of high-quality phosphate refractory castables for repair is also effective. When used as the lining and furnace body of thermal equipment, it should generally be baked before the first use, so that the physical water and crystal water in it are gradually eliminated to achieve a certain degree of sintering, so that its volume and some properties can reach a stable state when used.

The baking regime has a big impact on the service life.

The basic principle of the baking system should be that the rate of heating should correspond to the possible dehydration and other phase changes and deformations, and that the temperature should be slowly increased or even kept warm for a considerable period of time during certain temperature phases when such changes occur rapidly. If it is not baked properly or is quickly heated up and put into use without baking, it is easy to produce serious cracks, or even loose collapse, and it may even occur in the thick parts of Teben.

The above is the introduction of the ** and characteristics of refractory castables. The refractory castable is more expensive, because the formula used in this building material is more complex, so it will be more expensive than ordinary building materials. The performance of refractory castable is relatively good, it can not be eroded by various metals, and it can also not be affected by temperature changes.

Refractory castable is a very stable building material that is not prone to cracking and collapse. But this building material should not be overused, otherwise it is easy to happen**.

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1. Thermal conductivity 8-10 W. Thermal conductivity refers to a material's ability to conduct heat directly, or thermal conductivity. Thermal conductivity is defined as the direct conduction of heat by a material per unit temperature difference per unit section and length per unit time.

The unit of thermal conductivity is Watt-1 Kelvin-1. Thermal conductivity, where is the cross-sectional area of the heat conductor, is the heat conducted per unit time, is the thickness of the heat conductor between two heat sources, is the temperature difference. Substances with high thermal conductivity have excellent thermal conductivity.

When the heat flux density and thickness are the same, the temperature difference between the high-temperature sidewall and the low-temperature sidewall decreases with the increase of thermal conductivity. For example, when the boiler tube is not scaled, the temperature difference between the inner and outer walls of the steel tube is not large due to the high thermal conductivity of the steel.

The temperature of the inner wall of the steel pipe is close to the temperature of the water in the pipe, so the temperature difference between the pipe wall (the average temperature of the inner and outer walls) is not very high. 2. Castables blackness:

Physical indicators: porosity, body density, pressure resistance, slag resistance, thermal shock, foot expansion coefficient, thermal conductivity, oxidation resistance, etc., if the castable depends on the fluidity, water addition rate, solidification time, flexural strength. If it is a spread, it depends on the bond strength, etc.

Chemical indicators: calcion, aluminum, magnesium, silicon, calcium, chromium, titanium, carbon content. Thermal conductivity is one of the thermophysical parameters of materials, and it is also the most important thermophysical parameter of solids.

As an important parameter to characterize the physical properties of building energy-saving and thermal insulation materials, the thermal conductivity of low thermal conductivity materials has very important theoretical and application value for the accurate measurement of its parameter values. Steady-state heat conduction: The heat flow rate of the imported object is equal to the heat flow rate of the exported object, and the temperature of each point inside the object does not change with time.

Unsteady Thermal Conduction: The process of heat conduction in which the heat flux of the object is introduced and exported is not equal, and the temperature and heat content of any point in the object change with time, also known as the transient heat conduction process.