Refractory Materialan overview ScienceDirect Topics
Refractory materials that keep their chemical and physical strength at temperatures above 500 °C are of high importance for metallurgical and other industrial processes They consist of alumina magnesia silica lime and other metal oxides Global production for the metal glass and ceramics industries is about 12 million metric tons
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Chromite A cost effective refractory raw material for
Basic refractory Of these oxides chrome in the form of chromite is the most cost effective Depending on its chemical composition each type of refractory material will be more compatible with certain chemical and physical environments than with others Refractories are also classified according to
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ASNT Level 3 Basic Materials Processes Flashcards Quizlet
which of the following material properties are of most concern if corrosion resistance is essential During the steel making process a large number of faults such as slag porosity and shrinkage cavities exit in the top of the ingot One is the capability to produce shapes and objects of refractory metals that are extremely difficult
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Chrome Compounds Refractory Cements Refractory Materials
A refractory material is a crucial part of a furnace or masonry oven where it both acts as the major thermal barrier between the core and its housing and as a material that can join together other refractories such as silica or alumina Refractory materials dealt with here include refractory
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Refractory StandardsASTM
Refractory Standards ASTM s refractory standards are instrumental in specifying testing and evaluating the chemical physical and mechanical properties of various materials and products made of refractory These materials which are commonly made from the oxides of aluminum alumina silicon silica magnesium magnesia and calcium
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Recycling of refractory bricks used in basic steelmaking
Research by Nippon Steel Nakamura et al 1999 found that for spent Al 2 O 3 spinel castables the contaminated material concentrates in the smaller size fraction <1 mm after crushing due to the fact that slag crushes more easily than the refractory making this fraction only suitable for use as repair materials or gunning monolithics The
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Present status of refractories for ferro alloy industry
phases and replacing by highly refractory solid phases The conventional basic refractories are sili cate bonded The silicate bond which holds the brick together tends to soften at elevated temperatures While this complex silicate mat rix recrystallises upon cooling making the brick very strong at ambient temperatures the fact
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REFRACTORY NON WETTING OR CORROSION RESISTANT PROPERTIES
REFRACTORY NON WETTING OR CORROSION RESISTANT PROPERTIES AGAINST MOLTEN ALUMINIUM AND ITS ALLOYS Published on February 21 2016 February 21 2016
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A Chapter in the Refractories Handbook edited by
a basic substance contributes hydroxyl ions to make it more basic For example in steel refining the term V ratio is used where a ratio exceeding 1 0 implies a basic chemistry usually a basic slag chemistry and a ratio below 1 0 implies an acid chemistry the refractory after a used material is sectioned There may be a fluid
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Refractories Properties and Types Engineering
It is obvious that no single refractory will completely fulfill all these functions and hence the proper selection of a suitable material is often a complicated task Properties of Refractories A good refractory material should have the following properties 1 It should be able to withstand high temperatures generated in the furnace
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Lecture 15 Application of Refractory Materials
Properties Porosity varies from 8 to 24 depending on the firing temperature Magnesite These refractory are basic in nature Some properties are High quality refractory for critical applications in steel making at e g slag line impact area of molten steel stream bottom tuyere refractory in hybrid blowing immersion nozzles in
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Refractory what is it and what does it do African
Chemical classification of a refractory material refers to whether it is a basic acidic or neutral material Broadly speaking any material type is best suited to a refractory environment that is akin to it For example basic refractories are best used when the refractory environment is also basic or produces a basic byproduct
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Best steel ladle refractory lining design engineering
AOD TRL Krosaki is the only domestic manufacturer of Dolomite refractories serving the needs of Stainless Steel industries with more than 75 share of business in domestic market We offer customized refractory design and engineering to reduce the down trance and improve productions of AOD We also do Installation and maintenance under expert
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Types of Refractory Materials and Their Applications
Silica brick is a refractory material containing at least 93 SiO2 Various grades of silica brick have found extensive use in glass making and steel industry The physical properties of
Get PriceDesulfurization of Steel Refractory Steelmaking
Sulfur is present in solid steel as manganese sulfide MnS inclusions Inclusions affect the processing and properties of steel Sulfur is detrimental to ductility toughness formability weldability and corrosion resistance Manganese is beneficial to machinability
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Refractory StandardsASTM
Refractory Standards ASTM s refractory standards are instrumental in specifying testing and evaluating the chemical physical and mechanical properties of various materials and products made of refractory These materials which are commonly made from the oxides of aluminum alumina silicon silica magnesium magnesia and calcium
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Refractory lining of a Basic Oxygen FurnaceIspatGuru
Refractories are made to have combination of properties to withstand high temperatures and rapid changing environment condition during a heat in a converter A balance of properties such as hot strength oxidation resistance and slag resistance are expected from the converter refractories
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BASIC REFRACTORY COMPOSITIONSHINAGAWA
A basic refractory composition according to the present invention contains none or very little of components which are harmful to steel manufacture and the like such as phosphorus sulfur and boron which originate in chemical binders for refractories Therefore it is extremely excellent in that there is almost no contamination of steel due to
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REFRACTORY BRICKS AND CASTABLESidc online
To be a good insulating refractory brick they must have the following properties 1 Low thermal conductivity 2 Mechanically strong enough to bear the load of the structure 4 High porosity 5 Low permeability 6 Withstand the heat of at which they are used 7 Must not shrink or react chemically with the material with which they are in
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11 5 Refractory Manufacturing
Refractory manufacturing involves four processes raw material processing forming firing and final processing Figure 11 5 1 illustrates the refractory manufacturing process Raw material processing consists of crushing and grinding raw materials followed if necessary by size classification and raw materials calcining and drying
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Secondary Steelmaking RefractoriesA Practical Training
Consultants suppliers and recognized industry experts have developed a curriculum to educate attendees on the following topics refractory raw material selection properties of refractories application and limitations of refractories theory and application of insulation design and application of stir plugs lances and slidegates free opens refractory handling installation and pre heating ladle secondary
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Classification of refractory materialsDurocast
Depending on the operating environment they must be resistant to thermal shock be chemically inert and/or have specific ranges of thermal conductivity and of the coefficient of thermal expansion Acidic refractoriesconsist of acidic materials like alumina Al 2 O 3 and silica SiO 2 They are impervious to acidic materials but easily attacked by basic materials
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RefractoriesAn OverviewMaterial Science
For instance in steel making basic refractories are used because the refractories often encounter slags containing magnesium and calcium oxides If the refractory lining was made from acidic refractories it would be eroded quickly by the chemical interaction of the slag and the acidic lining e g silica forming low melting point compounds
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14 Types Of RefractoriesDifferent Types of Refractories
Silica refractory products consist of 93 silica They are the most widely used high temperature refractory bricks They are acidic refractories they resist acidic slag attack but attacked by basic slags Depending on the final we can two final products
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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
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What Basic Refractory Material Is Basic refractory means refractory made of magnesium oxide and calcium oxide including magnesite brick magnesia alumina brick magnesia chrome brick dolomite brick etc This kind of basic refractory material has the characteristics of high refractoriness and strong alkaline slag resistance and is widely used for open hearth oxygen converter electric
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What are the repair methods for refractory materials
Refractory material is the basic material of high temperature technology It is an important masonry material for lining of kiln In the condition of high temperature environment it is directly contact with slag furnace material decomposition gas and so on It changes gradually during the long term use
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Basic properties of refractory material for steel making
According to the working conditions of various steel furnaces it can be proved that the refractory material working circumstance is very bad Therefore whatever refractories are used it must possess the following properties 1 High temperature resistant and high refractoriness
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Roughly the raw materials of basic refractory are dolomite magnesite olivine and serpentine whose useful components are MgO CaO MgCO3 SiO2 and so on Specifically the raw materials of basic refractory are magnesia magnesia spinel magnesia calcium sand magnesia chrome sand and magnesia zirconium sand RS Basic Refractory Product
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Basic refractory compositionShinagawa Refractories Co
We claim 1 A basic refractory composition comprising 100 parts by weight of at least one basic aggregate selected from the group consisting of magnesia clinker dolomite clinker lime clinker limestone dolomite stone calcium hydroxide and brick scraps and 0 1 30 parts by weight of modified sodium silicate made from acidic china clay calculated as a powder or 0 1 30 parts by weight of
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Magnesia carbon refractory materials MgO C X is extensively used in steel making industry mainly in steel ladles basic oxygen LD converters electric arc fur naces and also in secondary steel making production Mainly because of its good compatibility high refractiv ity excellent corrosion resistance thermal shock resis
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