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Refractory materials are mainly used for high-temperature industries such as metallurgy, building materials, and non-ferrous metals. About 70% of them are used in iron and steel smelting, 17% are used in the building materials industry, and 3% are used in the non-ferrous metal industry. Driven by the demand from the downstream industries for refractory materials at home and abroad, the output of refractory products nationwide has stopped the downward trend for four consecutive years, and the annual output has reached 23.45 million tons, with a year-on-year increase of 2.3% for refractory materials. The output of dense-shaped refractory products was 13.27 million tons, and the growth rate was similar to that of refractory products. Among them, silicon bricks and magnesia bricks grew faster, increasing by 40% and 30% respectively; the output of thermal insulation refractory products was 540,000 tons, a year-on-year increase of 5.1%; the output of unshaped refractory products was 9.64 million tons, a year-on-year increase of 2.1%. Unshaped refractory materials have become an important member of refractory materials that cannot be ignored because they do not need to be performed and fired. my country’s monolithic refractory technology has developed rapidly, and the level of research and application has been...
The hearth is the place where molten iron and slag are contained, and coke is burned to produce a large amount of gas, which creates initial conditions for the reduction of the blast furnace. The hearth, especially the tuyere area is the highest temperature area in the blast furnace, with a temperature of 1700-2000°C and a furnace bottom temperature of 1450-1500°C. In addition to being affected by high temperatures, the hearth lining is mainly subjected to chemical erosion and erosion of slag and iron, and the bottom of the furnace is mainly eroded by the infiltration of molten iron. At the same time as the molten iron invades, alkali and zinc also invade. The intrusion of molten iron can cause refractory bricks to float up, and chemical erosion can cause the expansion of the embrittlement layer of refractory bricks, thereby causing serious damage to the refractory materials at the bottom of the blast furnace. These parts require refractory materials to have the corrosion resistance of molten iron, resistance to penetration of molten iron, alkali resistance, volume stability, and suitable thermal conductivity. The hearth is an important part of the blast furnace. The main causes of lining damage in this part...
Furnace Waist With Refractories The furnace waist acts as a buffer for the rising gas flow. The furnace charge here has been partially reduced to slag, the air permeability of the material layer has become poor, and the slag corrosion is serious at the same time. In addition, the temperature of the furnace waist is high (1400-1600 ℃, high-temperature radiation erosion is serious; alkali erosion is also relatively serious; dusty hot furnace gas rises, which has a strong scouring effect on the furnace lining; coke and other materials produce friction; hot air When passing through, it will cause a sharp change in temperature. The combined effect of the above factors makes the refractory material in this part seriously damaged. Therefore, the refractory material with strong slag erosion resistance and erosion resistance is generally selected for the furnace waist. For the inner part of the cooling plate structure, Graphite bricks are also used for lining. Bosh Refractories The bosh connects the furnace hearth and the furnace waist. The temperature in this area is higher, and the temperature of the lower part of the charge is about 1600-1650 °C, and the temperature of the airflow is also high, and a large amount...
The furnace throat mainly plays the role of protecting the furnace lining and reasonable distribution. When the furnace throat is working normally, the temperature is 400-500°C. This area is mainly affected by the direct impact and friction of the furnace charge, but the erosion of the gas flow is relatively light. Therefore, the furnace throat is generally made of water-cooled or non-water-cooled steel bricks (steel castings), and the gap between the water-cooled steel bricks and the furnace shell is filled with castables. The furnace roof is the gas enclosure and generally adopts metal anchors and wear-resistant refractory spray coating. The furnace shaft is an important part of the blast furnace, which plays the role of heating, reducing, and slagging the charge. It bears the scour of gas flow and the impact of materials from beginning to end. However, the temperature in the upper and middle parts of the furnace body is relatively low (400-800°C), and there is no slag formation or slag erosion hazard. This part is mainly subjected to the impact of the furnace charge, the wear of the furnace dust rising, the thermal shock (up to 50°C/min), or the intrusion of alkali, zinc, etc., and the deposition of...
The refractory industry is an important basic industry serving high-temperature technology and is particularly closely related to the iron and steel industry, ceramic industry, and glass industry. The new development of the high-temperature industry, especially iron and steel smelting technology, has promoted the technological progress of the refractory industry. The technological progress of the refractory industry has guaranteed the implementation of new technologies in the high-temperature industry. The stable production, high production, and long life of various kilns in the iron and steel industry are inseparable from refractory materials. Due to different uses and conditions of use, various kilns have different requirements for refractory materials that constitute their main bodies, and different types of refractory materials are also different. Due to the difference in chemical composition, microstructure, and production process, it shows different basic characteristics. Therefore, it is necessary to understand the basic properties of refractory materials to understand and study refractory materials for industrial kilns. On this basis, this article focuses on refractories for blast furnaces and hot blast stoves. The blast furnace is the main equipment for ironmaking. It has the advantages of large output, high productivity, and low cost, which is unmatched by other ironmaking methods. With...
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Henan Xinhongji Refractory Material Co., Ltd. (also called: Xinhongji Refractory), depending on the cooperation of the research in refractory materials together with Materials Institute of Henan University and Zhengzhou Engineering Institute, as well as stable high quality of our refractory products and extensive influence at home and abroad, actively developing the market abroad, we have customers in more than ten countries and regions in the world. High quality, integrity, and innovation, to impress customers with excellent products and first-rate services is our business philosophy, so customer satisfaction is our forever pursuit. Xinhongji Refractory is firmly developing a market abroad, looking forward to establishing long-term and friendly cooperative relations with international friends and customers and growing in win-win cooperation. Scope of Cooperation Supplying excellent refractory products Provide refractory testing equipment High-temperature buildings design and construction Refractory advisory services Establishing a good foundation and channel for win-win cooperation
Refractory bricks are a crucial component in industrial settings where high temperatures and harsh conditions are commonplace. These bricks, made of ceramic materials, can withstand extreme temperatures and are used to line furnaces, kilns, and other high-temperature equipment. They are essential for ensuring the safety of workers and preventing catastrophic accidents. One of the main benefits of refractory bricks is their ability to resist thermal shock. Thermal shock occurs when a material is rapidly heated or cooled, causing it to expand or contract quickly. This can lead to cracking or even the complete destruction of the material. Refractory bricks are specially designed to resist thermal shock, making them ideal for use in high-temperature environments. In addition to their thermal shock resistance, refractory bricks also have excellent insulation properties. This allows them to maintain a consistent temperature within the equipment they line, which is essential for ensuring that the equipment operates efficiently and safely. Insulation also helps to prevent heat loss, which can save energy and reduce costs. Refractory bricks come in a variety of shapes and sizes, which allows them to be customized to fit specific applications. They can be made into different shapes, such as curved, flat, or tapered,...
1. Refractoriness According to the refractoriness, refractory bricks can be divided into ordinary refractory bricks with a refractory degree of 1580-1770 degrees Celsius; advanced refractory bricks with a refractory degree of 1770-2000 degrees Celsius; special-grade refractory bricks with a refractory degree greater than 2000 degrees Celsius. 2. Porosity Generally, those with a porosity of about 3%-10% are called high-density refractory bricks, those with a porosity of about 20%-30% are called ordinary dense refractory bricks, and those with a porosity of 45%-48% are called lightweight refractory bricks. 3. Load Softening Temperature Refractory bricks can withstand a constant pressure load and produce deformation temperature at a certain heating rate. He said that the resistance of the refractory bricks to high temperatures and load at the same time. 4. Slag Resistance Acid refractory bricks have a strong ability to resist acid slag erosion, alkaline refractory bricks have a strong ability to resist alkaline slag erosion and neutral refractory bricks can resist both acid slag erosion and alkaline slag erosion. There are many types of refractory bricks, and choosing the right refractory bricks also has an important impact on the service life of the kiln.
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