Important wind direction for the development of refractory science and technology

1 the use of national raw material energy, discuss the development of new raw materials with their own characteristics

The country has rich refractory raw materials, such as magnesia, bauxite, graphite, three stone, dolomite, etc., and has discussed and developed a number of high-quality synthetic raw materials, such as bauxite-based spinel, bauxite-based fused corundum, magnesium dolomite, zircon corundum mullite, etc. However, there are still many things, the important ones are ① unstable quality, such as bauxite-based fused corundum carbon has not been removed, heavy projects cannot be pushed; ② Important functions have not been solved, such as CaO is easy to digest, graphite is difficult to disassemble in water, Alon has poor anti-chemical combination function, etc. Therefore, it is necessary to conduct in-depth discussions, expand outreach, explore new functions, and strive to capture the international market. At the same time, according to the energy characteristics of refractory raw materials, it is necessary to discuss in depth the development of new synthetic raw materials with national energy characteristics.

(1) discussion on homogenization optimization of refractory raw materials, such as discussion on mobilizing bauxite quality and industrialization of high-quality alum, forming a series of high-quality bauxite clinker with Al2O3 content of 50% ~ 905; Discussion on modification of refractory raw materials, such as discussion on mobilizing the functions of bauxite-based fused corundum, bauxite-based spinel, zircon corundum mullite and other raw materials; Discussion on the transformation of refractory raw materials, such as bauxite, synthesis of Sialon, Alon and other non-compounds and composite materials with compounds; discussion on the preparation and application of micropowders, such as the development and application of nanoscale refractory powders.

(2) Discussion on the surface layer of refractory raw materials, such as improving the liquefaction resistance of magnesium dolomite, dolomite and calcareous raw materials and the temperature and dispersibility of carbon materials such as graphite to water, so as to drive the amorphous formation of refractory materials containing free CaO and graphite.

2 smelting new technology with high-skill refractory materials

The development of new skills in the smelting industry and the optimization of the production structure have put forward new requirements for refractory materials. Refractory materials not only do not meet the development requirements in terms of variety and quality, but also have in-depth discussions on process optimization and commodity efficiency, so as to mobilize the variety and quality of refractory materials, meet and drive the development of the smelting industry.

(1) Special refractory materials for heavy blast furnace and non-blast furnace ironmaking

① tacit understanding of blast furnace longevity, high air temperature, high coal injection skills development, discuss the development of Sialon/Si3N4, the conclusion of corundum products, micro-also, ultra-micro-hole, graphitized, semi-graphitized carbon bricks, new porcelain cups, tuyere joint set bricks and other high-quality composite materials, used in important parts of the blast furnace, so that the service life of the first generation of furnace can reach 12 to 15 years.

② Discussion and selection of new technologies for direct reduction and smelting reduction with refractory materials, such as high-performance Al2O3 -- Si C- -C, Mg O--C bricks, bricks and SiC bricks concluded with various non-SiC compounds.

(2) Continuous casting new technology can use the efficacy of refractory materials

① Development of long furnace age immersion nozzle, long nozzle and group stopper for continuous casting, focusing on materials for slag line; Adapt to low carbon long nozzle and immersion nozzle used in ultra-low carbon Al stabilization steel, etc. Discuss the development of high-performance Al2O3 -- C/ZrO2 -- Ca O--C composite, O' -- Sialon-ZrO2-graphite shaped immersion nozzle for thin slab continuous casting and rolling.

② High manganese steel, high oxygen steel, calcium treated steel and other steel compound-non-compound composite skateboard, compound zirconium skateboard, alkaline skateboard, mosaic skateboard, etc.

③ Development of aluminum-magnesium, non-compound concluded corundum long-furnace ladle breather plugs. Special compound aluminum aggregate and non compound are quoted to optimize the microstructure of the material and improve its thermal shock resistance. Discuss the gas supply element for long furnace life converter re-blowing, and satisfy the development of converter re-blowing skills of slag splashing protection furnace.

④ Develop continuous casting slag suitable for different steel grades, including high-speed continuous casting slag, thin slab continuous casting slag, special effect slag, etc.

(3) High-quality refractories for electric furnace steelmaking, refining outside the furnace and cleaning steel metallurgy.

① Discuss and develop gas supply elements for argon blowing and stirring at the bottom of ultra-high power electric furnaces, and conductive materials with long furnace life at the bottom of DC electric furnaces, so as to further stabilize and mobilize the quality of refractory materials for electric furnace steelmaking.

② discuss the development of high quality, appropriate unit price of MgO-(ZrO2)-C, MgO-CaO, Al2O3 products and castables, meet the RH, LF, LV/VD, VOD, etc. as the representative of the furnace refining skills development needs.

③ Tacit understanding of clean metallurgy, discussing the series of refractory materials for ladle, intermediate ladle and crystallizer, aiming at long life and reducing the pollution of refractory materials to molten steel and absorbing impurities in molten steel, discussing the development of carbon-free alkaline castables for heavy ladle slag line (high infiltration resistance, high tear shock resistance), calcium-containing alkaline refractory materials (including slag wall, coating, covering agent) for long furnace age.

3 hardware, light industry, environmental protection and other industries with high quality refractory materials

Refractory materials for hardware, light industry, environmental protection and other industries require very good thermal shock resistance, creep resistance, corrosion resistance, etc. It is very necessary to develop these new functional materials.

(1) Important refractory materials for heavy duty off-duty kilns, pool kilns, wire drawing kilns and other new kilns, such as high-purity dense chromium-containing bricks, low-foaming dense zircon and supporting materials, AZS casting products, etc.

(2) Development and application of refractory materials for secondary Vatican firing furnaces, such as the development of corresponding refractory materials for secondary Vatican firing equipment, including series of castables with strong gas resistance, fluid erosion resistance, alkaline vapor corrosion resistance and penetration resistance; Lightweight, high thermal insulation, porous refractory castables; Silicon carbide series press-in materials for the water-cooled pipe wall of the boiler table; Silicon carbide materials used in the combustion chamber and the lower part of the combustion chamber that are difficult to form of metal and slag; fly ash melting furnace with AL2O3 -- Cr2O3 -- ZrO2, MgO -- Cr2O3 -- ZrO2, ZrO2 qualitative shaping and amorphous series materials; development of Cr2O3-free high corrosion resistance shaped refractory materials.

(3) Refractory materials for water-coal paddle volatilization furnace and fluidized bed boiler table are mainly discussed on the technological premise related to the pouring and bonding of Cr2O3 -- ZrO2 series materials, and the common problem of making Cr2O3 -- ZrO2 series materials compact and sintered below 1600 ℃ is solved from the technological point of view.

(4) A series of high-performance porcelain kiln furniture for firing electronic porcelain, including high-purity mullite kiln furniture for firing ferrite, etc. IC substrate, high-purity corundum-mullite series kiln furniture for firing such as composite aluminum porcelain, etc. High-purity composite zirconium series kiln furniture for firing semiconductor electronic porcelain; Lightweight and high-strength composite zirconium-based compound series such as composite zirconium toughening composite aluminum or mullite, etc.

(5) Refractory materials for aluminum electrolytic cells, including various high-quality SiC bricks and impermeable materials.

(6) Development of chromium-free bricks and high-performance castables for steel rotary kilns.

(7) Coatings with different functions, such as anti-chemical and conductive coatings for graphite electrodes, anti-chemical and high-temperature resistant coatings, energy-saving coatings, etc.

4 Development of construction castable for unshaped refractory

(1) Develop high-density, wet blowout construction technology and equipment for new monolithic refractories to reduce costs, reduce labor intensity, improve operating environment, save energy and reduce consumption.

(2) Discussion on the development of carbon-containing castables, solving the technological problems of carbon-containing castables, and developing series of castables such as Al2O3-C and MgO-C.

5 Discussion on Basic Theory of Refractory Application

(1) The application of computer in the discussion and adoption of refractory materials.

(2) Refractory physical and chemical function and application function of the relationship between the comments, such as ladle slag viscosity weight gain mechanism and refractory material self repair skills basic discussion.

(3) the discussion of non-destructive detection methods of refractory materials.

(4) the influence of nano materials on the function and structure of refractory materials is discussed.

(5) Discussion of compound-non-compound composites.

(6) Metal material-non-metal material composite material discussion.