In 1983, Japan used non-burning Al2O3-SiC-C refractories that can meet the needs of modern torpedo-type molten iron tankers and ladles, which triggered a worldwide revolution. Aluminum carbon refractory bricks belong to the range of aluminum carbon refractories. The so-called aluminum carbonaceous refractory refers to a carbon composite refractory made of alumina raw materials and carbon raw materials, and in most cases other raw materials, such as silicon carbide, metal silicon, etc., are bonded with organic binders such as asphalt or resin. Material. Broadly speaking, the refractory material with Al2O3+C as the main component is called aluminum carbonaceous refractory material. According to the production process, aluminum carbonaceous refractories can be divided into two categories: non-fired aluminum carbonaceous refractories and fired aluminum carbonaceous refractories. The performance characteristics are strong corrosion resistance, good thermal shock stability, high strength and high thermal conductivity.
Aluminum-carbon bricks include two types, one is aluminum-carbon bricks containing alumina and graphite, written as Al2O3-C bricks; the other is aluminum-carbon bricks containing alumina, silicon carbide and graphite, written as Al2O3-SiC-C bricks . The production processes of the two types of aluminum-carbon bricks are different. Al2O3-C bricks are fired at high temperature, that is, Al2O3-C bricks are fired. Al2O3-SiC-C bricks are non-fired bricks that have not been fired at high temperature. Fired Al2O3-C bricks with high strength are typically used for cast steel slides. Non-burning Al2O3-SiC-C bricks can be added with a variety of special additives, especially with special properties of alkali resistance, slag resistance and oxidation resistance. Its typical use is the lining of torpedo-type molten iron trucks. In recent years, my country has used them for blast furnace lining.
​As an enterprise, the most fearful thing is that the product will not be sold, and the enterprise has no reputation. Now is the era of the Internet, and the era when wine is not afraid of deep alleys has passed. If you want to do a good job in sales, please register as a member of Aike Business Network for free, you can publish product sales information, industry exhibition information, investment joining information for free, and also publish advertising articles such as corporate news and new product express. There are more than a dozen vertical business websites under Aike Business Network, such as Plastic Business Network, Chemical Business Network, Instrument Business Network and so on. By registering an account, you can publish commercial information on more than ten platforms and display it permanently. Your peers are all in action, so don't forget it.
Blast furnace Aluminum carbon refractory brick is a good material for blast furnace lining replacement. Its performance is better than traditional refractory bricks for blast furnace lining, and its performance is similar to that of silicon nitride combined silicon carbide bricks, and the cost is reduced by 2/3. Therefore, since the advent of aluminum-carbon bricks, it has been applied in blast furnaces and obtained good results.
How to choose raw materials
Refractory aggregates and powders mainly use super-grade and first-grade bauxite clinker, white corundum, brown corundum and other materials can also be used; carbon materials mainly use flake graphite, as well as medium-temperature pitch, etc.; silicon carbide uses super-grade or first-grade products , dense SiC can also be used; phenolic resin is used as the binder, with a solid content of ≥75%, free phenol ≤6%, carbon residue ≥43%, moisture content ≤2%, and a density of about 1.1g/cm3. Its general mixing ratio: coarse aggregate 40%~60%, fine aggregate 5%~20%, flake graphite 8%~15%, SiC4% 10%, refractory powder 15%~25% and binder 4%~ 6%. In addition, admixtures such as ultrafine powder, alkali retardant and swelling agent are added as required.
Mixing, forming and heat treatment are similar to magnesia carbon bricks
Aluminum-carbon bricks have been widely used in molten iron pretreatment equipment because their oxidation resistance is significantly better than that of magnesia-carbon bricks, and the corrosion resistance of Na2O-based slag is excellent. The fired aluminum carbon refractory material (fired Aluminum carbon refractory brick for short) belongs to the ceramic combination type, or belongs to the ceramic-carbon composite combination type. It is widely used as sliding nozzle slide plate for continuous casting, long nozzle, submerged nozzle, upper and lower nozzle bricks, integral stopper rod, etc. Fired Aluminum carbon refractory bricks have become long-life ingot refractory materials due to their high strength, high erosion resistance and high thermal shock resistance.
In addition, the modern refractories used in blast furnace tapping trenches are also unshaped refractories made of Al2O3 as the main raw material, adding SiC and C. Although there are many types of iron groove materials, including ramming materials, plastics, castables, vibrating materials, etc., in addition to asphalt or resin bonding, there are also chemical bonding, cement and clay bonding, etc., but they are also aluminum-carbon refractory materials. category of materials.