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Refractory materials are classified into shaped refractories and amorphous refractories. Unshaped refractory material generally refers to castable. It is a mixed powdery granule composed of various aggregates or aggregates and one or more binders. It must be mixed with one or more liquids evenly when used. Strong fluidity and plasticity.
The castable is a granular and powdered material made of refractory material and is composed of a certain amount of binder and moisture. It has high fluidity, is suitable for casting, and can be used to harden amorphous refractories without heating. It consists of refractory aggregates, powders, binders, admixtures, water or other liquid materials. It is usually cast at the site of use by pouring, vibrating or tamping, or it can be made into prefabricated parts.
Refractory castables are currently the most widely produced and shaped refractory materials. It is mainly used to construct various structures such as various furnace linings. Certain premium varieties can also be used in smelting furnaces. For example, aluminate cement refractory castables can be widely used in various heating furnaces and other non-slag, acid-free corrosion-free thermal equipment. In places where the working temperature is high, such as tapping trough, ladle and blast furnace body, tapping ditch, etc., which are eroded by molten iron, molten steel and slag, it can be combined with low calcium and pure high alumina cement. A refractory castable made of high quality granules and powders with a high alumina and good sintering. For example, phosphate refractory castables can be widely used in heating furnaces and heating metal soaking furnaces, as well as in coke ovens and cement kiln directly in contact with materials. It is also effective to repair with high quality phosphate refractory castables in some parts of metallurgical furnaces and other vessels that are in direct contact with molten slag and molten metal. It is more appropriate to use a phosphate refractory castable in areas where the operating temperature is not high and the wear resistance is high. If a corundum refractory material is used to make a refractory castable, it generally has a good effect in a reducing atmosphere.
As the ratio of unshaped refractory materials in refractory materials increases, refractory castables will develop rapidly, and at the same time, the quality of varieties will increase accordingly. The focus will still be on low-cement, ultra-low cement and cement-free refractory castables. Combining resource conditions with homogenized and high-quality raw materials and special aggregates to improve the basic composition, research and promotion of fiber-reinforced refractory castables and self-flowing refractory castables, application of various admixtures to improve the performance of refractory castables, in addition, development Castables (such as iron sump, steel lining, etc.) and special functional materials (such as wear-resistant, acid-resistant, alkali-resistant, high-strength heat insulation, high-strength and high-heat-conductivity), perfect in production and application technology Production equipment and construction equipment.
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Lightweight insulation castable