The refractory material is an inorganic non-metallic material having a refractoriness of not less than 1,580 °C. Widely used in various fields of national economy such as steel, non-ferrous metals, glass, cement, ceramics, petrochemicals, machinery, boilers, light industry, electric power, military industry, etc., it is an essential material to ensure the production and operation and technological development of the above-mentioned industries. It plays an irreplaceable role in the development of high temperature industrial production.
Since 2001, under the strong development of high-temperature industries such as iron and steel, non-ferrous metals, petrochemicals and building materials, China's refractory industry has maintained a good growth trend and has become a major producer and exporter of refractory materials in the world. In 2011, China's refractory production accounted for about 65% of the world's total, and production and sales ranked first in the world's refractory materials.
According to statistics, the output of refractory raw materials and products increased steadily from 2001 to 2010, of which the end of the "Tenth Five-Year Plan" was about twice that of 2001; in 2010, the output of refractory products nationwide reached 2,080,600 tons, about three times that of the end of the "Tenth Five-Year Plan". . As of 2011, China's refractory industry has a total of 1,917 enterprises above designated size, employing more than 300,000 people, achieving sales income of 337.679 billion yuan and achieving a sales profit of 47.737 billion yuan.
The choice of particle size for refractory properties is extremely important. The correct choice of particle size directly affects the quality of refractory materials, the introduction of micropowder and ultrafine powder technology, greatly increasing the density of refractory products, promoting the firing of samples, improving the strength of products, and improving the durability and erosion resistance of refractories. For the refractory materials, especially for low-cement, ultra-low cement castables and self-flowing castables, the ultrafine powder plays a certain role as a binder and has a water reducing effect. The particle size and distribution of the micropowder have a great influence on the water addition and fluidity of the sample and the properties of the material.
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