Refractories and Classification of Refractories. Refractories are inorganic, nonmetallic, porous and heterogeneous materials composed of thermally stable mineral aggregates, a binder phase and additives. The principal raw materials used in the production of refractories are normally the oxides of silicon, aluminum, magnesium, calcium and zirconium. There are some non-oxide refractories like
The main criterion on the basis of which the refractories and refractory materials are classified is their chemical behavior, mostly by their reactions to the type of slag. Accordingly we have three types of Refractories: Acid, Basic & Neutral. Apart from these there are few more types of refractories like Special refractories, Insulating Refractories, & Cermets.
Acid refractories are those which are attacked by basic slags. These are not affected by acid slags and hence, can be safely used where the environment is acidic. Examples of acid refractories are: 1. Silica (Most acidic). 2. Semi Silica. 3. Alumino Silicate Refractories. a) High Alumina (exception, for they react with basic slags). b) Fireclay groups e.g. LHD (Low Heat Duty), HHD (High
There are different standards of the classification of refractory materials.Based on the mineral composition, the different types of refractories are carbon materials, magnesia refractories, silicon refractory materials, alumina materials, chrome refractories, and corundum materials, etc. According to the chemical properties, the types of refractory materials are acid refractory materials
Classification of refractories. The classification of refractory materials is based on two different criteria: chemical properties and physical properties (production methods). Firstly, let’s look at refractories in terms of their chemical properties. Acid refractories are insensitive to acidic substances, but are easily affected by alkaline
Types of Refractories: Refractories are used in all kinds of industries with the furnace to reduce the heat loss. The used refractory properties required for each kiln/furnace varies based on the application. So different refractories are used to provide unique properties. In this article, we are going to see all types of refractories available in the industry.
Classification of Refractories And Commonly Used Refractory Bricks Refractories are inorganic, nonmetallic, porous and heterogeneous materials composed of thermally stable mineral aggregates, a binder phase and additives. These materials have ability to retain its physical shape and chemical identity when subjected to high temperatures. Refractories can be classified in the different following
There are different standards of the classification of refractory materials. Based on the mineral composition, the different types of refractories are carbon materials, magnesia refractories, silicon refractory materials, alumina materials, chrome refractories, and corundum materials, etc. According to the chemical properties, the types of refractory materials are acid refractory materials
26/03/2018· Classification of refractories Acid / silica refractories Basic / magnesia refractories Neutral / special refractories All in hindi in detail with examples Mujhe ummed h appko Mechanical Guru ka
Introduction to Refractories Refractories are material having high melting points, with properties that make them suitable to act as heat-resisting barriers between high and low temperature zones. ASTM C71 defines refractories as "non-metallic materials having those chemical and physical properties that make them applicable for structures or as components of systems that are exposed to
Standard Classification of Silica Refractory Brick: C455 07(2018) Standard Classification of Chrome, Chrome-Magnesia, Magnesia-Chrome, and Magnesia Brick: C467 14(2018) Standard Classification of Mullite Refractories: C545 97(2018) Standard Classification of Zircon Refractories: C673 97(2018)
American Refractories Company (NARCO) and Harbison-Walker, at the time naming the resulting organi-zation RHI Refractories America. Today, the U.S. and export operations have been reorganized and operate independently under the name ANH Refractories. Because of the strong reputations that Harbison-Walker and NARCO established over their
A refractory material or refractory is a material that is resistant to decomposition by heat, pressure, or chemical attack, and retains strength and form at high temperatures. Refractories are inorganic, nonmetallic, porous, and heterogeneous. They are typically composed of oxides of the following materials: silicon, aluminium, magnesium, calcium, and zirconium.
Monolithic refractories are used in numerous applications and industries. This article covers these applications and the types of refractories that are used in particular parts of the operation. But the type of refractory used and even the kind of materials utilized in a specific application will vary from one plant to another, and the information given below is provided only as a guide.
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