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The carbon calcining furnace is a high-pressure molded carbon material product. Under the condition of isolating air, the carbon roasting furnace is indirectly heated at a specified temperature to improve the strength, conductivity, and high-temperature resistance of carbon products. Carbon calcining furnaces are divided into continuous multi-chamber, closed, and open types. Since the high temperatures in various parts of the calciner are different, the refractory materials used for the refractory bricks in the calciner are also different. Such as brick piers at the bottom of closed roasting furnaces, pit bricks that bear the weight of the upper masonry and baked products, fire shafts with temperatures above 1400°C, etc. Therefore, the masonry is mostly made of clay bricks with high mechanical strength and good thermal stability. The lid of the closed roasting furnace needs to be moved during the production process, so it is built with lightweight refractory bricks. The main structure of the carbon calcining furnace includes the furnace bottom, side walls, fire channels, and connected fire channels. The furnace bottom is made of lightweight refractory bricks, the material box is made of special clay bricks, the side walls are made of lightweight refractory bricks, and the fire passages and...
What is the temperature of an ordinary flame? Generally speaking, the highest temperature flame is around 500℃. Of course, the flame temperature of different burning materials will also vary. What is the maximum temperature range of mullite refractories? According to test standards, the refractory temperature of mullite refractory bricks should be around 1200℃-1700℃! What is this concept? The iron-making temperature is generally around 1300-1500°C, and mullite refractory bricks can withstand the test of molten iron for a certain period. Therefore, the fire-resistant properties of mullite refractory bricks are real. The ultra-high temperature performance of mullite refractory bricks makes it the first choice for high-temperature furnace construction. However, on January 19, 2018, the national standard “mullite” officially implemented the testing of “refractory bricks” (GB845). Of course, we are unfamiliar with the various testing indicators specified in the new standards. Below, Henan refractory brick manufacturer Xinhongji Refractory will introduce them to you in detail. First, the mullite refractory brick license plate logo is divided into 7 levels, mg-23, mg-25, mg-26, mg-27, mg-28, mg-30, and mg-32. When the change rate of the heating line is less than 2%, the corresponding test temperatures are 1230°C, 1350°C, 1400°C, 1450°C, 1510°C, 1620°C, and 1730°C. Secondly, the...
Friends who know a little about our refractory products must know that clay refractory bricks and refractory bricks are refractory materials. So at this point, some friends must be asking, what is the difference between these two products? If you happen to need this product, then the refractory brick manufacturer will now give you a simple explanation. Clay refractory bricks are a type of refractory bricks and are accurately defined as shaped refractory products. It is the difference between a series of refractory materials and the form of delivery. Conceptually, clay refractory bricks are a weakly acidic refractory material using refractory clay or burnt stone clinker as the main raw material. It is a weakly acidic refractory material with good thermal shock resistance and acid slag corrosion resistance. It is widely used. Clay bricks with refractory clay as the main raw material are called ordinary clay bricks, and clay bricks with lower apparent porosity are called low-porosity clay bricks. Refractory bricks are referred to as fire bricks. Refractory materials are made of refractory clay or other refractory materials. Light yellow or brown. It is mainly used to build smelting furnaces and can withstand high temperatures from 1580°C to 1770°C. Also...
Choosing good refractory bricks can make us get twice the result with half the effort when using them, and also provide great convenience for later work. However, due to the powerful performance of this product, many customers have recently asked us how to choose. Of course, being responsible to customers is also a principle. Now Xinhongji Refractory has compiled this information. Now let us give you a brief introduction. How to choose refractory bricks correctly According to the content and role of various chemical components in refractory materials, they are usually divided into three categories: main components, impurity components, and additive components. Impurities refer to chemical components that differ from the main components of refractory materials and have a small content. These components often cause harm to the high-temperature resistance of refractory bricks. This chemical component is mostly carried from the main ingredient’s raw material. Refractory bricks have the main components, which play a decisive role in the high-temperature performance of the material. Refractory bricks have good high-temperature resistance and many refractory materials depend entirely or essentially on their main components. Therefore, the main components of refractory materials should be paid attention to. Generally speaking, refractory materials are classified according...
Hot blast furnace is one of the main equipment for blast furnace ironmaking. Accurate technical parameters are the basis for ensuring the normal operation of equipment! With the scale of blast furnaces, the improvement of raw and fuel quality, the development of injection technology, and the improvement of blast furnace operation levels, the requirements for wind are getting higher and higher. The intermediate requirements for hot air stoves are to achieve high air temperature and long life. 1. Performance of refractory bricks for hot blast stoves Refractory bricks for hot blast stoves include clay bricks, silica bricks, and high-alumina refractory bricks (including mullite bricks, sillimanite bricks, andalusite bricks, kyanite bricks, and cordierite bricks). The requirements for refractory bricks in hot blast furnaces are low creep rate, good high-temperature strength, and good thermal shock resistance. In addition to meeting the above requirements, the checkered bricks used in hot blast stoves should also have a large heat capacity. In the design of hot blast stoves, to reasonably select refractory bricks, it is necessary to understand their performance parameters and usage environment parameters. Because accurate technical parameters are the basis for ensuring the normal operation of the equipment! Hot blast stoves use lightweight...
What do you need to know when buying refractory bricks? What kind of furnace lining can the purchased refractory bricks be used for? Can refractory bricks achieve practical application results? How do you purchase refractory bricks to achieve good results? Based on the actual situation, the issues that should be addressed when purchasing refractory bricks are expounded. Kiln site using refractory bricks 1. Understand the characteristics of the furnace According to the structure of the furnace, the working characteristics, and the operating conditions of each part of the furnace, refractory bricks are selected to achieve targeted selection. For example, the linings and bottoms of various smelting furnaces (such as furnaces and reverberatory furnaces) below the slag line are mainly subject to chemical erosion by slag and metal melt, followed by thermal stress caused by temperature mutations. The masonry generally uses magnesia and magnesia-chromium refractory bricks with good slag resistance. The above slag lines can use magnesia-alumina bricks, magnesia-chrome bricks, or high-alumina refractory bricks. 2. Ensure the normal operation and overall life of the furnace As the lining of the kiln, it must ensure its normal operation and overall service life. Reasonably configure various refractory bricks used in various parts of...
The service life of high-temperature kiln refractory bricks is closely related to many internal or external factors. For example, in the face of many customers, friends will ask, do refractory bricks absorb water? Can it be used when wet? Here I answer your question. Refractory bricks themselves have pores, so refractory bricks absorb water, and the water absorption rate is determined by their porosity. The pores are divided into three categories: one side is closed and the other side is connected to the outside world, called open pores; those that are closed in the sample but not connected to the outside world are called closed pores. The several sides of the traditional sample are called closed pores, which are called ventilation holes. Total porosity, or true porosity, refers to the total volume of pores in a sample as a percentage of the total volume of the sample. Generally, through holes and open holes are merged, and there are fewer closed holes, making it difficult to measure directly. Therefore, porosity is expressed in terms of open porosity, that is, apparent porosity. Apparent porosity refers to the total volume of open pores in the sample as a percentage of the total volume...
During the use of refractory bricks, they will be damaged due to physical factors, chemical factors, mechanical factors, and other factors. We will analyze them in detail one by one. Physical factors: During use, the refractory bricks crack due to rapid changes in temperature. Excessive temperature causes high-temperature melting. The refractory bricks shrink or expand after re-burning, causing damage to the furnace body and shortening the service life of the refractory bricks. The oven is improperly dried, the temperature rises too quickly, and the refractory bricks expand thermally too much. The furnace body is damaged and the service life of the refractory bricks is shortened. Chemical factors: chemical attack of slag (including chemical attack of ash). In general, the corrosion of the lining of the refractory materials in the smelting furnace is mainly caused by the chemical corrosion of the furnace gas. Mainly refers to the gradual oxidation and erosion of carbon refractory materials in high-temperature oxidation furnace gas, and chemical erosion occurs between refractory materials. When acidic and alkaline refractories are mixed together, fusible compounds form at the point of contact at high temperatures, causing both to erode simultaneously. The principle of electrochemical corrosion of carbon refractory bricks is...
What are the main uses of refractory bricks? The following is introduced by the technical department of Xinhongji Refractory. I hope it will be helpful to you. What are the main uses of refractory bricks? We will introduce the main uses of refractory bricks and hope to be helpful to customers who need to use refractory bricks. Refractory bricks are generally divided into two types: unshaped refractory bricks and shaped refractory bricks. Unshaped refractory materials: also known as castables, are composed of a variety of aggregates or aggregates and one or more binders, and have strong fluidity. Shaped refractory materials: Generally, refractory bricks are made, and their shapes have standard rules. They can also be temporarily laid and cut according to needs. The main uses of refractory bricks are as follows Refractory bricks are often used to build stoves—for example, boilers, furnaces (melting metal), hot blast furnaces, etc. The furnace should be built with refractory bricks. Refractory bricks are mainly used for lining high-temperature industrial kilns, such as iron and steel industry blast furnaces, hot blast furnaces, converters, non-ferrous metal reverberatory furnaces, rotary kilns, etc. It can be used as high-temperature building materials and structural materials for building kilns and...
The firing process of refractory bricks includes charging, firing, and discharging. The charging method and quality of refractory bricks have a great impact on the operation of the kiln and product quality. Xinhongji Refractory believes that it directly affects the heat transfer rate of the products in the kiln, the size of the combustion space, and the uniformity of airflow distribution, and is also related to the firing time and fuel consumption. The principle of kiln installation is that the brick stack should be stable, the fire path distribution should be reasonable, and the airflow should be evenly heated according to the distribution of the amount of bricks installed in each part. Products of different specifications and varieties should be installed at appropriate locations in the kiln to maximize the effective space in the kiln and increase the loading capacity. Carry out the kiln loading operation according to the pre-made brick loading diagram, which stipulates the brick loading height, arrangement, spacing, stacking positions of different types, the size and number of fire escapes, etc. The technical indicators of refractory brick loading include loading Density (T/m3), effective cross-sectional area (%), the heating speed of the product in the kiln is related...
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