GB1597327A, GB1597327A GB13994/78A GB1399478A GB1597327A GB 1597327 A GB1597327 A GB 1597327A GB 13994/78 A GB13994/78 A GB 13994/78A GB 1399478 A GB1399478 A GB 1399478A GB 1597327 A GB1597327 A GB 1597327A Authority GB United Kingdom Prior art keywords borings molten metal furnace cast iron induction furnace Prior art date 1977-05-02 Legal status (The legal status is an ,Thermal Consistency in Coreless Induction Furnaces ,, Slag residuals will deposit themselves along the refractory walls and also within the coil The type of slag varies depending on the material the furnace is melting Those at a high melting point can be especially prone to this kind of build-up, at the point where the hot slag makes contact with the colder surface of the refractory wallUSE OF SILICON CARBIDE IN THE INDUCTION FURNACE, build -up crust at the slag line in the furnace Moreover this slag being less oxidized would have a larger capacity to absorb some sulphur from the melt if , coreless induction furnace would be as follows: Bottom of furnace: 1) A light raw material cover in small pieces (to protect the bottom of the furnace)Improving Ladle Cleanliness for Iron Foundries | Foundry ,, For ladles with severe sidewall build-up, a series of "wash heats," or taps, where the flux is added to the molten metal in each tap, and significant reduction of the sidewall buildup will be observed after five taps During this wash heat practice, the ladle is de-slagged and the ladle is poured back into the furnaceControlling refractory erosion in induction furnaces: the ,, Aug 01, 1991· Free Online Library: Controlling refractory erosion in induction furnaces: the linkage between equipment, alloy system and slag environment affects refractory effectiveness (part 3) by "Modern Casting"; Business Metals, metalworking and machinery Erosion (Geology) Induction furnaces Maintenance and repair Materials Mechanical wear Refractories (Materials) Refractory materials Wear ,.
Washcoats, Wash coats are typically used to protect the underlying refractory lining from chemical attack or slag build up, by both chemically repelling slag and preventing mechanical damage by acting as a parting agent or sacial liningTypical Causes of Slagging and Fouling Problems in Boilers, Jun 01, 2015· The products of combustion from that one burner can, in fact, slag up the furnace exit Some fuels are more unforgiving than others The coal ash ,US4162156A, Process for melting cast iron borings comprising continuously charging dried borings into a coreless induction furnace operated within controlled metal levels to achieve adequate stirring of the molten metal in the furnace, drawing incoming borings beneath the meniscus of the molten metal surface, controlling the dissolved oxygen content of the molten metal to ensure formation of carbon oxide ,US4612498A, The specification discloses a computerized monitor for a coreless induction furnace The monitor includes a first potential transformer connected across the coil and a second potential transformer connected between one end of the coil and an electric ground The relative location of a ground fault along the length of the coil is approximated by computing the ratio of the transformer outputsControl of Slag and Insoluble Build, Figure 1: Typical Slag Build Up in a Coreless Induction Furnace The areas of slag deposits are at a much lower temperature than the center of the furnace walls Slag also is deposited in areas midway down the crucible lining, where insufficient metal turbulence from magnetic stirring occurs.
Controlling Slag Defects, Insoluble Buildup in Melting and ,, The adhesions and/or build-up interfere with melting, thereby decreasing furnace efficiency It is not unusual to have two inches or more of slag buildup occur on the walls of coreless, channel furnaces, pressure-pour furnaces, or ladles within the first several hours of operationEconomic Consequences of Insoluble Buildup on Coreless ,, Historically it experienced extensive slag buildup on the upper sidewalls of its four three-ton medium-frequency coreless induction furnaces, in a semi-batch melting operation With a newly installed silica lining, melting capacity is 1,525 tons/month with two furnaces running five days/week, 21 days/monthControl of Slag and Insoluble Buildup in Ladles, Melting ,, Figure 1: Typical slag buildup in a coreless induction furnace (gray shaded areas) The hottest area of medium and high frequency coreless furnaces is at the mid-point of the power coil All areas of slag deposit will be at a much lower temperature than those occurring at the center of the coilAvoiding high bottoms in brick, Oct 01, 1990· * The buildup causes the heat and slag to be positioned higher in the furnace, thereby subjecting the walls and roof to greater radiant heat and subsequent accelerated deterioration of the refractory lining in these areas *As the slag line moves up with the higher bottom, a greater refractory surface area is affected by the chemical slag attackFeed Chutes and Coreless Induction Furnace Authorized ,, The Coreless Induction Furnace is considered by many to be the most versatile melting unit available for the foundry industry The demands placed on the refractory lining vary and are often very complex, bringing very different sets of circumstances that can affect the ,.
Slag eliminator for furnace viewing system, An anti-slagging apparatus for a furnace viewing system removes slag build up deposited on a closed circuit television camera lens tube by occasionally releasing a blast or large volume of air through specially designed ports surrounding the tube containing a furnace viewing lens systemPinpointing electric coil problems in the coreless furnace ,, Sep 01, 1990· This metal build-up grounds the bath through the furnace frame The ohmmeter can indicate a bath fault even though the fault is external to the coil The ohmmeter current travels into the coil, out an external fault point, down a yoke, up the furnace frame, over the splatter build-up, down the bath, down the ground rods, and back to the meterUS3751571A, A multi strata refractory lining for coreless induction furnaces, formed from a castable refractory cement The composition of the cement is preferably a mixture of fused or dead burned spinel, magnesia and/or alumina aggregate, a lesser amount of reactive magnesia, and a small amount of an organic ac When the cement is cast into the form of a lining in a furnace, cured, dried, and ,Method for improving operational efficiency in clogged ,, Generally, slag is required to remain liquid at temperatures likely to be encountered during melting, metal treatment, or metal handling Slag is required to be fluid for ease of removal from the melting furnace, to promote good slagging reactions and to prevent build-up in channel furnace throats and loops as well as coreless furnace sidewallsControl of Slag Defects and Insoluble Buildup in Melting ,, Typical Slag Build Up in a Coreless Induction Furnace Figure 2: Slag Build-up in Inductor throat of Vertical Channel Furnace When this happens, insufficient metal flow through the inductor loop hampers heat transfer and inter-feres with the melting operation It is very difficult to remove accumulations of slag from the inductor loop or throat ,.
Maintenance Strategy for an Induction Furnace, Oct 16, 2018· During the operation of a coreless induction furnace, eddy currents are produced due to the built up charge and as a result it prompts a stirring action To improve the performance frequency, laminations of iron are provided externally so as to provide a primary wound that helps the creation of low reluctance platform for fluxInduction Furnaces, Excessive stirring can increase gas pick up, lining wear and oxidation of alloys The coreless induction furnace has largely replaced the crucible furnace, especially for melting of high melting point alloys The coreless induction furnace is commonly used to melt all grades of steels and irons as well as many non-ferrous alloysGeotechnical properties of steel slag aggregates: Shear ,, Oct 01, 2019· The electric arc furnace generates two types of slag at various stages of the steelmaking process, namely, electric arc furnace slag (EAFS) and ladle furnace slag (LFS) The refinement of one ton of recycled steel in an electric arc furnace generates around 140 kg of EAFS and roughly 40 kg of LFS (Maghool et al, 2016a)Designs and operation of melting furnaces differ markedly ,, Aug 01, 1989· The yokes serve to pick-up "stray" flux generated by the coil They are not required in "box" or nonmagnetic furnace construction Line frequency coreless furnaces (60-120 Hz), may require a starting block or a molten heel of metal during start-up, while medium to high frequency furnaces (120-10,000 Hz) melt from a cold chargeRefractory failure in induction furnaces can be limited ,, Jun 01, 1991· The deposits entrap metal that superheats, causing penetration and even refractory melting Coreless furnaces can build up in the midcoil area to the extent that the entire lower crucible becomes bridged A similar scenario results in channel furnaces when the throat becomes clogged, bridging the inductor to the body of the furnace.
Steam Power II Test #3 Flashcards | Quizlet, An accumulation of slag build up on the boiler furnace floor will cause _____ I peeling of furnace brickwork II overheating of the furnace floor a) I only b) II only c) Both I and II d) Neither I nor II D Slagging of boiler furnaces is a slow progressive action which is accelerated by _____Coreless Induction Furnace, Electric Induction Furnace ,, Slag Build Up In the CIF segment, we have more then 50 years of successful partnerships in the foundry industry worldwide We offer a full set of monolithic linings covering all refractories for the complete furnace (hot face lining, cast blocks, coil grouts, covers, spouts, mica slip planes, etc)
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