Core Tips: After more than 50 years of hard work, China's alkaline refractory production has made great progress, and many products have reached or approached the international advanced level. As a whole, the price of magnesium carbon bricks is still far from the international advanced level. Both advanced technology and backward equipment coexist, and key varieties of the ministry still need to be imported, and the amorphous ratio is far lower than that of advanced steel producing countries.

       After more than 50 years of hard work, China's alkaline refractory production has made great progress. Many products have reached or approached the international advanced level. On the whole, there is still a large gap compared with the international advanced level. Advanced technology and backward equipment coexist. The key varieties of the ministry still need to be imported, and the amorphous proportion is far lower than that of advanced steel producing countries. For example, China's ton steel refractory consumes about 26kg, Japan and Europe ton steel refractory consumes 8.5-10kg, South America 14kg, North America 12kg; large-scale ladle life 280 times, ton steel consumption 2.5kg, foreign ladle through sleeve pouring and maintenance life 800 Second, 0.92kg per ton of steel is consumed; China's amorphous form accounts for 30% of refractory materials, while Japan accounts for 60%, the United States 53%, Europe 45% -59%; the waste beacon material recycling rate is more than 60%, China's less than 20%; The large-scale cement rotary kiln has reached 10,000t /, and the key fire materials used in China's 4000td kiln, such as magnesia-chrome brick, magnesia dolomite brick, spinel brick, etc., need to be imported. In terms of technological level, the main reasons for the gap with the international advanced level are as follows

       (1) Lack of original technologies with independent intellectual property rights;

       (2) Basic theoretical research is seriously inadequate;

       (3) Weak research on environment-friendly ecological refractories;

       (4) Waste of raw material resources, low recycling rate of refractory materials; high energy consumption and large pollution

       Therefore, the goal of the future efforts of alkaline refractories should be based on the advantages of China's refractory raw materials resources. First of all, the concept of circular economy should be established, and basic theoretical research, original technology, environmentally friendly ecological refractories research, and the development of high-quality synthetic materials and Important issues such as efficient products and the development of suitable, energy-saving, and efficient equipment.

       The 2006-2020 Guide for the Development of Science and Technology in China's Iron and Steel Industry "proposes that the overall goal of refractory materials is: by increasing investment in scientific and technological development and improving the scientific and technological development system, China's refractory technology innovations have entered the international advanced ranks; continuous optimization of production processes and equipment At the same time, a combination of China's resource characteristics, the structure system of refractory materials for iron and steel metallurgy, which are world advanced levels in terms of life span, functional characteristics and environmental protection, fully meet the requirements of China's steel science and technology progress. The requirements of China's steel technology development goals: "oxidation Bio-non-oxide composite materials and high-calcium refractory materials have become important new types of refractory materials to comprehensively improve the service life of ladle, tundish, continuous casting nozzle, sliding nozzle, immersion nozzle and cleanliness of molten steel. Requires the variety and quality assurance of refractory materials to achieve a blast furnace life of more than 15 years by 2010, the average furnace age of the converter is greater than 10,000 furnaces, the continuous casting anti-blocking immersion nozzle is not less than 10 hours, the ladle age is not less than 150 times, and the life of the electric furnace lining is not less than The key technologies of less than 800 furnace alkaline refractories are: functional refractory production technology, amorphous refractory optimization technology; non-hydratable high CaO series refractories technology; long-life sliding nozzle refractory technology with a life of not less than 10 times; no Chromium, low chromium, carbon-free and low-carbon refining refractory technology; refractory repair technology (mainly refractory for continuous casting); non-destructive testing technology for refractory materials; production and application of nano-scale refractory materials; high electrical conductivity of electric furnaces, Erosion-resistant and long-life bottom electrode refractory technology; Alkaline refractory production process energy-saving system technology; Full CaO, non-hydraulic, high-strength clean steel refractory technology; Metallurgical functional refractory technology (mainly refers to continuous casting Large pieces); Ultra-long life furnace lining and lining refractory technology; Full continuous steel production process series refractory technology and other product varieties that need to be addressed are: development of aluminum and magnesium Long-life ladle vent plugs; alkaline special functional protective slag; high-quality alkaline refractory materials for electric furnace steelmaking, external furnace refining and clean steel; O-base alkaline refractory materials that are suitable for clean steel smelting and have long life span and can absorb impurities in molten steel (Including slag retaining walls, coatings, covering agents); MgOC2O3ZfO2 refractories for waste incinerators; chrome-free alkaline refractories for cement kilns, among which magnesium iron-aluminum spinel bricks have a better price-performance ratio; develop high-performance MgO Base castables and gradient alkaline castables promote the indefinite shape of refractory materials containing free CaO and graphite, and the amorphous proportion will reach 60% by 2020: research and development of transition materials such as magnesium and magnesium to meet the needs of ultra-low carbon steel production; volume The density is 3.4g / am2.The high-purity magnesia scale production process: and eliminating the harm of binder asphalt and resin to the environment and people, etc., Qinghai Chaerkai salt storage has 4 billion: magnesium chloride hexahydrate, annual production of potassium fertilizer discharge by-product magnesium chloride hexahydrate It has 30 million tons. It has been proved by laboratory work that the high purity magnesium hydroxide can be obtained economically by using the ammonia method, and it is possible to obtain high purity magnesia with more than 99% of MaO and a bulk density of 3.4 g / cm3. Therefore, the production and oxidation of post water is developed. Magnesium is also one of the important development directions in the future.

       After more than 50 years of construction and development, China's refractory industry has basically met the needs of domestic high-temperature industries. At present, its output accounts for about 40% of the world's output. It has become a major producer of refractory materials and is advancing towards a strong refractory production country. Refractories play a more important role. Looking back at history, with the development of high-temperature industries such as steel, building materials, non-ferrous metals, people have a deeper understanding of the interdependence and mutual promotion of refractories and high-temperature industries.Magnesia refractories More prominently, "fine material" and "equipment (including furnace and kiln)" are the basis for the development of refractory materials, and "(refractory material) varieties and applications" are the keys. The development policy of China's refractory industry is to improve quality, increase varieties, and intensify To improve the international comprehensive competitiveness of enterprises and industries, China's refractory industry has transformed from a large country in production, consumption and export to a country with comprehensive competitiveness that has reached the international advanced level. Magnesium refractories will play a key role.