The Slag Regime of Equipment Used for the Secondary Treatment of Steel and the Durability of Its Refractories

Sheshukov, O. Yu.; Nekrasov, I. V.; Михеенков, М. А.; Egiazar’yan, D. K.; Ovchinnikova, L. A.; Metelkin, A. A.; Kashcheev, I. D.; Цепелев, В. С.

doi:10.1007/s11148-015-9842-0

Refract Ind Ceram

2015

DOI: 10.1007/s11148-015-9842-0

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The Slag Regime of Equipment Used for the Secondary Treatment of Steel and the Durability of Its Refractories

O. Yu. Sheshukov

I. V. Nekrasov

М. А. Михеенков

et al.

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2017

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“…The To assess the effect of the proposed material on physical and technological characteristics of the slag, studies were made. They included calculating and measurement of viscosity, slag desulfurizing properties, and its surface tension [6]. The introduction of flux increased the liquidity of slags, increased their surface tension, which should positively affect the removal of nonmetallic inclusions from the metal to the slag.…”

mentioning

confidence: 99%

Unit Ladle-Furnace: Slag Forming Conditions And Stabilization

Yu.¹,

Nerkasov²,

Mikheenkov³

et al. 2017

Kms

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Nowadays almost all smelted steel is processed in "ladle-furnace" (LF), where the steel is processed under refining conditions and brought to the desired temperature and chemical composition. Therefore, large amounts of refining slag are formed. Only in Russia there is about 1.4 million tons of slag exported to dumps annually. This slag cannot be processed by the schemes implemented in the industry, since the slag quickly turns into the tiniest dust during solidification and cooling. Such dust is easily aerated and carried by the wind for long distances; it pollutes soils, dissolves in ground, sedimentary and sewage waters. It also pollutes slag dumps that are suitable for processing for crushed stone.According to the data [1], the main reason of the LF slag disintegration is the polymorphic transformation of dicalcium silicate (2CaO⋅SiO 2 , C 2 S) (Figure 1), which is promoted by the high content of CaO in the slag. The high-temperature -modification is converted to a low-temperature -modification, with an increase in volume by 12%, which causes internal stresses in the mass of monolithic slag and also causes slag disintegration. It is noted that even a small amount of -C 2 S (about 4 wt.%) may be enough for decomposition.It is noted [1][2][3][4][5] that there are 4 ways to prevent the slag decomposition:1. The slag quenching ( -C 2 S receives the ability to maintain its qualities in the temperature range from 25 to 700 ∘ C);2. The borate addition (a partial substitution of SiO 4 4− ions in the C 2 S structure by BO 3 3− ions, which prevent the transformation of -C 2 S into -C 2 S);

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mentioning

confidence: 99%

Unit Ladle-Furnace: Slag Forming Conditions And Stabilization

Yu.¹,

Nerkasov²,

Mikheenkov³

et al. 2017

Kms

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The Slag Regime of Equipment Used for the Secondary Treatment of Steel and the Durability of Its Refractories

Cited by 1 publication

References 4 publications

Unit Ladle-Furnace: Slag Forming Conditions And Stabilization

Unit Ladle-Furnace: Slag Forming Conditions And Stabilization

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