Magnesium Oxide_Magnesium Hydroxide_Magnesium Carbonate Group-Zehui Group
In the vast landscape of high-temperature industries, refractory materials stand like steadfast guardians, ensuring the stable operation of various high-temperature production processes. أكسيد المغنيسيوم, with its excellent physical and chemical properties, occupies a pivotal position in the field of refractory materials and has become a key element supporting the development of the industry.
Characteristics of Magnesium Oxide – The Foundation of Refractory Performance
One of the core advantages of magnesium oxide as a refractory material is its high melting point. With a melting point as high as 2800°C, it can calmly cope with the high temperatures of molten steel above 1600°C in steel smelting and the furnace temperatures above 1500°C in glass manufacturing. It maintains the stability of its solid structure, is not easy to melt or deform, and builds the first solid line of defense for high-temperature industrial equipment.
Thermal stability is also a notable characteristic of magnesium oxide. Its thermal expansion coefficient is relatively small. In an environment with drastic temperature fluctuations, the volume change of the material is controlled within a very small range, which greatly reduces the internal stress caused by thermal expansion and contraction, effectively preventing refractory materials from cracking, spalling and other damage, and significantly prolonging the service life of refractory materials. For example, in cement rotary kilns and other equipment that frequently experience temperature rises and falls, أكسيد المغنيسيوم – based refractories can serve stably, ensuring the continuity of production.
In terms of chemical stability, magnesium oxide shows good corrosion resistance to various chemicals such as acids, alkalis and salts at high temperatures. In the process of steel smelting, steel slag has a complex chemical composition and extremely high temperature. Magnesium oxide can resist the erosion of steel slag, maintain the stability of its own chemical composition and performance, ensure the stability of the smelting environment, and does not interfere with the quality and efficiency of steel production. At the same time, magnesium oxide is not easy to be oxidized and decomposed at high temperatures, and has strong oxidation resistance. Even if it is in contact with air, oxygen, إلخ. for a long time, it can always maintain stable performance, further improving the reliability of refractory materials in high – temperature environments.
Diversified Applications of Magnesium Oxide in Refractory Materials
Microporous Magnesium Oxide Refractories
Microporous magnesium oxide refractories with high porosity and low thermal conductivity can be prepared by synthesizing lightweight aggregates through specific processes and reasonably adjusting the particle composition. Using magnesite fine powder as a pore – forming agent, the original salt pseudomorphic form formed by its thermal decomposition endows the lightweight aggregate with a uniform microporous structure. By precisely adjusting the content of the pore – forming agent, the microporous morphology can be accurately controlled, and then refractory products with specific thermal expansion coefficients and thermal conductivities can be obtained. Such materials are widely used in high – temperature kilns, industrial furnaces and other equipment with strict requirements on thermal insulation performance, effectively reducing heat loss and improving energy utilization efficiency.
Recycling of Fused Magnesia Waste
The waste generated in the production of fused magnesia can return to the field of refractory material manufacturing after proper treatment. These wastes are mainly composed of magnesium oxide, with a density usually ranging from 2 to 2.5g/cm³. The recycled magnesium oxide refractories can be used for laying the bottom of equipment such as high – carbon chromite hot stoves. In high – temperature environments, they react with molten high – carbon ferrochrome to form stable refractory substances, without the need to add other refractory bricks and other materials, realizing the recycling of resources, reducing production costs, and reducing the impact of industrial waste on the environment.
Optimization of MgO – C Refractories
MGO – C refractories play an important role in key steelmaking equipment such as converters, electric furnaces, refining furnaces and ladles due to their good thermal shock resistance and resistance to high – temperature slag erosion. Studies have found that the comprehensive performance of MgO – C refractories can be significantly optimized by adjusting the graphite content and other means. Reasonably increasing the graphite content can enhance the toughness of the material, improve its ability to resist sudden temperature changes, and at the same time improve the slag erosion resistance to a certain extent, meeting the complex and harsh high – temperature working conditions in the steelmaking process.
Industry Demand and Market Status
With the continuous development of high – temperature industries such as steel, glass, cement and ceramics, the demand for refractory materials shows a steady growth trend. As a key raw material for refractory materials, the market scale of magnesium oxide is also expanding. According to relevant industry reports, the global consumption of magnesium oxide in the field of refractory materials has increased year by year in recent years. Among them, the steel industry, as the largest application field of magnesium oxide refractories, accounts for more than 50% of the consumption. With the increase in investment in infrastructure construction in various countries and the recovery of manufacturing industries such as automobiles and home appliances, the demand for steel is expected to continue to grow, which will drive the demand for magnesium oxide in the refractory materials market.
In terms of market supply, global magnesium oxide resources are widely distributed, and countries such as China, the United States and Russia have rich magnesite reserves. China, relying on its resource advantages and mature production technology, has become one of the world’s major producers and exporters of magnesium oxide. However, with the stricter environmental protection policies and the improvement of market demand for high – quality magnesium oxide, the industry is facing the pressure of industrial upgrading and structural adjustment. On the one hand, some backward production capacities are gradually eliminated because they cannot meet the environmental protection standards and product quality requirements; on the other hand, enterprises with advanced production technology and environmental protection facilities have increased research and development investment, committed to producing high – purity and high – performance magnesium oxide products to meet the market demand for high – end refractory materials.
