13.6 tons refractory cement are packed for delivering to the steel plant in Zimbabwe.
Historical data show that with people’s discovery and understanding of the heat resistance of calcium aluminate, the output of calcium aluminate in Europe in 1913 increased rapidly. When the unshaped refractory casting materials began to take their own development steps in the 1920s. By the end of the 1980s and the 1990s, new casting techniques gradually appeared. The first to be introduced and used was the pumping and self-flowing technology of low-cement castables. After that, wet spraying or spraying technology appeared. exist
In these technological changes, refractory cement was produced.
It is also called aluminate cement. Aluminate cement is a hydraulic cementitious material made of bauxite and limestone as raw materials, calcined to produce clinker with calcium aluminate as the main component and about 50% alumina content, and then ground. Aluminate cement is often yellow or brown, but also gray. The main minerals of aluminate cement are monocalcium aluminate (CaO·Al2O3, abbreviated as CA) and other aluminates, as well as a small amount of dicalcium silicate (2CaO·SiO2).
The ratio of refractory cement to sand is about 30%. It is actually very simple to use. It can be hardened by adding water when needed. Generally, there is no need to add other binders, just add some appropriately Bone meal and refractory aggregate will do. If it is said that it is purely used refractory cement, although it also has flame retardant properties, it is prone to cracks after high temperature. Generally, it can withstand a temperature of about 1300 degrees.
1. Good plasticity, convenient to use in construction. Moreover, its viscosity and strength are relatively large, and when used, it has good corrosion resistance.
2. It has a high refractoriness and is a very good refractory material. However, if the temperature is too high, exceeding 1300°C, cracks are likely to occur.
3. It has good thermal exfoliation and good resistance to slag invasion, so it is widely used in coke ovens, glass furnaces, blast furnace hot blast furnaces, and other industrial furnaces. Its application industries also include: metallurgy, Building materials, machinery, petrochemicals, glass, boilers, electricity, steel, cement, etc., have very good flame retardant properties.
Detailed process parameters of high temperature wear-resistant insulation of rotary kiln. Precautions in the construction of refractory castables. High temperature wear-resistant castables are packaged and shipped in the form of dry powder. After the rotary kiln insulation construction site is stirred and vibrated, add an appropriate amount of the fire dragon special solution, and after curing for a period of time, the castable oven curve can be directly used according to the rotary kiln oven curve. High-temperature wear-resistant castables have the characteristics of high strength, good wear resistance, and low porosity.
1. Proportioning. It is easy to use. It can be hardened only by adding an appropriate amount of water to mix it during use. Generally, refractory cement does not need to be added with other binders. If necessary, add some refractory aggregates and powders.
2. Precautions for use. In use, if you say that the refractory cement is simply used at high temperatures, it is easy to crack. It can be widely used in various refractory aggregates, such as corundum, calcined high alumina bauxite, etc., to make a refractory mortar or concrete for cement rotary kilns and other industrial kilns as linings.
3. Many people confuse it with refractory soil, or mix it with refractory soil, so that its use value will be greatly reduced. As a result, it will have a lot of solidification strength and markings. In this way, when the furnace refractory is finished and air-dried, the material will fall off with a hand button. Its strength is very low, and its use time is very short. It is not recommended to use this way. .
High-aluminum ramming material uses bauxite clinker with 88% Al2O3 as aggregate and powder, and adds more fused corundum powder to matrix performance, while adding clay as plasticizer; magnesium-aluminum-chromium The ramming material is made of fused magnesia-chromium composite and aluminum-magnesium spinel. Alkaline refractories are mainly composed of magnesium oxide and calcium oxide, and magnesia bricks are commonly used. Magnesium bricks containing more than 80%-85% of magnesium oxide have good resistance to alkaline slag and iron slag, and have higher refractoriness than clay bricks and silica bricks. Mainly used in open hearth furnace, oxygen blowing converter, electric furnace, non-ferrous metal smelting equipment and some high temperature equipment.
