Wetting of refractories of the CaO-MgO system by slags

Sveshkov, Yu. V.; Kalmykov, V. A.; Борисов, В. Г.; Val'dman, O. A.

doi:10.1007/bf01283477

Cited by 4 publications

(3 citation statements)

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“…In the current study, when the newly contact area was covered by the slag, the initial penetration was caused by the flow of slag through grain boundaries, micro cracks and pores without any reaction. The initial penetration finished in a short time, within which the dissolution of the solid oxide into the slag was relatively slow [25] . The following penetration was accompanied with the dissolution of CaO until the slag was saturated with…”

Section: Slag Basicitymentioning

confidence: 99%

Wettability between molten slag and dolomitic refractory

Shen

Zhang

Wang

et al. 2016

Ceramics International

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In the current study, the wettability between molten slag and dolomitic refractory materials used in the ladle during steel refining was investigated. The contact angle between molten slag and dolomitic substrate decreased with increasing temperature. The slag with lower basicity spread on the substrate more easily and penetrated deeper into the substrate. The penetration depth of slag into the refractory increased with the extension of holding time. The CaO in the refractory dissolved into slag which was then saturated with CaO. The reaction between slag and substrate resulted in the formation of solid Ca3SiO5, which slowed down the further penetration of slag into the refractory.

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Section: Slag Basicitymentioning

confidence: 99%

Wettability between molten slag and dolomitic refractory

Shen

Zhang

Wang

et al. 2016

Ceramics International

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“…In [8] with the use of motion pictures the wetting by slag of the surface of refractories impregnated with resin was recorded and ~'incompletion" of the process of spread of the slag and the formation of a final wetting angle differing from 0 deg were observed while in spreading of the slag on refractories without carbon the process is completed by full wetting, that is, until a wetting angle approximately equal to 0 deg. This article presents the result of investigation of the wetting of refractories with oxygen-free additions by molten 45 steel in a medium of argon.# The compositions and prop ~ erties of the investigated refractories are presented in Table 1 and the experimental results in Table 2.…”

mentioning

confidence: 99%

Interaction with steel of refractories containing oxygen-free additions

Aksel'rod¹,

Val'dman²,

Dol'nikov³

et al. 1984

Refractories

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Refractories containing in their composition carbon and oxygen-free compounds such as carbides, nitrides, borides, etc. are acquiring increasing practical value [i].Present and future areas of their use include the linings of converters and electric arc furnaces, refractories for ladle gate valves and teeming of steel in continuous billet casting machines, etc.In their interaction with molten metals these refractories exhibit specific features, some of which are discussed in this article.As a first approximation as the result of the high surface activity of oxygen and sulfur in it (their surface activity may exceed the content by tens of times) the surface of molten steel may be represented in the form of the highly electronegative anions 0 =-and S =-in coordination with the cations Fe 2+, Mn =+, etc.In interaction with the oxidizable elements of the refractories the anions form intermediate products all the way to oxides, including gaseous ones.The corrosion of carbon-containing refractories under the action of steel under equilibrium conditions may be represented in three stages [2]:at the steel--refractory contact under the action of surface-active oxygen, oxidation of the carbon occurs and a decarburized zone is formed; the decarburized zone with increased porosity rapidly forms a slag and the products of the interaction have decreased refractoriness, mechanical strength, and thermal coefficient of volumetric expansion differing from the original material; for these reasons the slagged layer of the refractory is rapidly washed away by the steel.The increase in metal resistance of a refractory with the addition of oxygen-free additions, particularly carbon, is the result of the following facts: frequently, the carbon addition is made by impregnation or precipitation from the gaseous or liquid phase into the finished refractory and the carbon partially replaces the porous spaces, mechanically preventing penetration of the molten metal; the products of gasification of the carbon pneumatically prevent penetration of the molten metal into the voids; in the microvolumes carbon deoxidizes the molten metal in contact with it and the highly active oxide forms of iron are converted into less active lower oxides all the way to the metallic state, a confirmation of which is the presence of beads of pure iron in the reaction zones of carbon-containing refractories after their wetting even by slag.To the products of gasification of carbon are added the gases entrapped in the void space and the gaseous products of reduction by carbon of the oxides of the refractory occurring according to reactions of the type:(SiO2, AI2Oa, ZrO~, ZrO=.SiO,, MgO era. )ml+Cso~C0g~+SiOg ~ AIOg~ era.These reactions occur both in the contact zone and in the thickness of the refractory with diffusion of CO and gaseous suboxides into the contact zone. In addition, the decomposition of oxygen-free compounds is possible according to reactions of the form SiaN4--+2N2+3Si.All-Union Refractory Institute.

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“…The effect of the mineral composition and the porosity of the refractory substrates on the wettability of these by metal and slag was studied in [1][2][3].…”

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confidence: 99%

Some features of the interaction between melts and the lining of an induction furnace

et al. 1983

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Smelting steel in industrial furnaces has several technical, economic, health and hygiene, and ecological advantages over other steel-smelting methods. The widespread use of induction smelting of steel, particularly of alloyed steel, is hindered by the low resistance of the main lining, which is the result of ignoring the special features of the manufacture of the lining, its bringing on line, and operation. The consumption of refractories in induction smelting sometimes reaches 40 kg per ton of liquid steel.An important feature of induction furnaces is the presence of a large (up to 20-30=C/mm) temperature gradient between the working surface and the water-cooled inductor, which leads to the emergence of significant thermal and mechanical stresses in the lining as well as to intermittent working.The high working temperature of smelting and the intense electromagnetic perturbation of melts cause significant interaction to occur with the lining.The material of the lining should not be wetted by the molten metal and slag if one is to avoid migration of the melts into the depth of the lining. Corundum, fused magnesite, and composites of these in various compositions are most frequently used as the lining materials for induction furnaces, particularly vacuum furnaces; mineralizing and building components are added to the main refractory material in the batch for the manufacture of the lining.All the operations of preparing the crucible for the first standard smelting are directed to obtaining a crucible with the optimum material compositions and the optimum porosity of the structure. In order to reduce the wetting it is necessary to strive for a reduction in .•130

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Wetting of refractories of the CaO-MgO system by slags

Cited by 4 publications

References 0 publications

Wettability between molten slag and dolomitic refractory

Wettability between molten slag and dolomitic refractory

Interaction with steel of refractories containing oxygen-free additions

Some features of the interaction between melts and the lining of an induction furnace

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