A class of inorganic non-metallic materials with a refractoriness not less than 1580°C. Refractoriness refers to the Celsius temperature at which the refractory cone sample resists the action of high temperature without softening and melting under the condition of no load. However, only the definition of refractoriness cannot fully describe refractory materials, and 1580°C is not absolute. It is now defined as all materials whose physical and chemical properties allow it to be used in a high temperature environment are called refractory materials. Refractory materials are widely used in metallurgy, chemical industry, petroleum, machinery manufacturing, silicate, power and other industrial fields. They are the largest in the metallurgical industry, accounting for 50% to 60% of the total output.
Refractory materials are used in various fields of the national economy such as steel, non-ferrous metals, glass, cement, ceramics, petrochemicals, machinery, boilers, light industry, electric power, military industry, etc., and are essential basic materials to ensure the production operation and technological development of the above industries. It plays an important and irreplaceable role in the development of high-temperature industrial production.
Since 2001, driven by the rapid development of high-temperature industries such as iron and steel, nonferrous metals, petrochemicals, and building materials, the refractory industry has maintained a good growth momentum and has become a major producer and exporter of refractory materials in the world. In 2011, China’s refractory production accounted for approximately 65% of the world’s total, and its production and sales volume steadily ranked first in the world.
The development of the refractory industry is closely related to the retention of domestic mineral resources. Bauxite, magnesite and graphite are the three major refractory materials. China is one of the world’s three largest exporters of bauxite, the world’s largest reserves of magnesite, and a large exporter of graphite. The rich resources have supported China’s refractory materials for a decade of rapid development.
With the “Twelfth Five-Year Plan” period, China is speeding up the elimination of outdated and high energy-consuming production capacity. The industry will focus on the development and promotion of new energy-saving furnaces, development of comprehensive energy-saving technologies, energy management, emission control of the “three wastes” and resource utilization of the “three wastes” Recycling, etc. Committed to resource recycling and reuse of refractory materials after use, reduce solid waste emissions, improve the comprehensive utilization of resources, and comprehensively promote energy conservation and emission reduction.
The “Refractory Industry Development Policy” points out that the unit consumption of refractory materials in China’s steel industry is about 25 kilograms per ton of steel, and it will fall below 15 kilograms by 2020. In 2020, China’s refractory products will be longer-lived, more energy-efficient, pollution-free, and functionalized. Products will meet the needs of national economic development such as metallurgy, building materials, chemicals, and emerging industries, and will increase the technical content of export products.
Refractory materials have many varieties and different uses. It is necessary to scientifically classify refractory materials to facilitate scientific research, rational selection and management. There are many classification methods for refractory materials, including chemical attribute classification, chemical mineral composition classification, production process classification, and material morphology classification.
1.According to the level of refractoriness:
Ordinary refractory material: 1580℃~1770℃, advanced refractory material: 1770℃~2000℃, special grade refractory material: >2000℃
2. Refractory materials can be divided into:
Fired products, unfired products, unshaped refractories
3. Classified by material chemical properties:
Acid refractory, neutral refractory, alkaline refractory
4. Classification according to chemical mineral composition
This classification method can directly characterize the basic composition and characteristics of various refractory materials. It is a common classification method in production, use, and scientific research, and has strong practical application significance.
Silica (silica), aluminum silicate, corundum, magnesia, magnesia calcium, aluminum magnesia, magnesia silicon, carbon composite refractories, zirconium refractories, special refractories
6. Classification of unshaped refractory materials (classified according to the method of use)
Castables, spray coatings, ramming materials, plastics, holding materials, projection materials, smear materials, dry vibrating materials, self-flowing castables, refractory slurries.
Neutral refractories are mainly composed of alumina, chromium oxide or carbon. The corundum product containing more than 95% alumina is a high-quality refractory material with a wide range of uses.
Chiping Wanyu Industry and Trade Co., Ltd., established in 2010, specializes in the production of wear-resistant and refractory products: white corundum section sand, fine powder, and granular sand series products.
Wear-resistant series specifications: 8-5#, 5-3#, 3-1#, 3-6#, 1-0#, 100-0#, 200-0#, 325-0#
Granular sand specifications: 20#, 24#, 36#, 40#, 46#, 54#, 60#, 80#, 100#, 150#, 180#, 200#, 220#, 240#,
Post time: Dec-30-2021