Equilibrium of reduction of titanium oxides from blast-furnace-type slags of the CaO-MgO-SiO2-Al2O3-TiO2 system in liquid phases

Benesch, Ryszard; Łędzki, A.; Kopeć, Roman; Stachura, R.

doi:10.1016/0040-6031(89)85412-7

Cited by 11 publications

(4 citation statements)

References 3 publications

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“…[12][13][14][15] Recently, the transport phenomena associated with the formation and dissolution of Ti(C,N) were also revealed by CFD (Computational Fluid Dynamics) methods. [16][17][18] Generally speaking, the hearth condition is extremely complicated, featured with the intensive interactions among molten slag, metal, gas, coke in terms of flows and thermochemical behaviors companying with high temperature and high pressure.…”

Section: Dissection Investigation Of Ti(cn) Behavior In Blast Furnacmentioning

confidence: 99%

Dissection Investigation of Ti(C,N) Behavior in Blast Furnace Hearth during Vanadium Titano-magnetite Smelting

et al. 2017

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Section: Dissection Investigation Of Ti(cn) Behavior In Blast Furnacmentioning

confidence: 99%

Dissection Investigation of Ti(C,N) Behavior in Blast Furnace Hearth during Vanadium Titano-magnetite Smelting

et al. 2017

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“…Benesch et al 2,3) studied the distribution of titanium between CaO-SiO 2 -MgO-Al 2 O 3 -TiO 2 slags and carbon saturated iron. However, the slag composition they investigated was in a relatively narrow range, i.e., the MgO content of 5 or 7 % and the lime to silica ratio of about one.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of Titanium Oxide in Ladle Slags.

Jung

Fruehan

2001

ISIJ International

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A MoSi 2 -resistor furnace with an alumina tube was used for the equilibrium experiments. The master slag was prepared by melting mixtures of reagent grade CaO, SiO 2 , Al 2 O 3 , and MgO in a MgO crucible using an induction furnace in open air and the master alloy, carbon-saturated iron, was melted in a graphite crucible under a carbon monoxide ISIJ International, Vol. 41 (2001), No. 12, pp. 1447No. 12, pp. -1453No. 12, pp. 1447 © 2001 ISIJ Thermodynamics of Titanium Oxide in Ladle SlagsSung-Mo JUNG and R. J. It is necessary to have information on the thermodynamic behavior of titanium oxide in ladle type slags in order to control the titanium content in several grades of steel. In the present study, the thermodynamics was determined from the equilibrium between Fe-C sat -Ti and CaO-SiO 2 --30%Al 2 O 3 -MgO-TiOx slags in equilibrium with CO and from the equilibrium between Fe-C sat -(16ϳ18)%Cr-Si-Ti and CaO-SiO 2 -20%Al 2 O 3 -MgO-TiOx slags in equilibrium with CO. From the experiment with Fe-C sat -Ti alloy, the activity coefficients of TiO 1.5 and TiO 2 vary with basicity from 0.3 to 1.5 and from 0.5 to 2.3, respectively. And from the experiment with Fe-C sat -(16ϳ18)%Cr-Si-Ti alloy, the activity coefficients of TiO 1.5 and TiO 2 vary with basicity from 0.4 to 1.4 and from 0.6 to 3.5, respectively. The results obtained from the equilibrium between Fe-C sat -(16ϳ18)%Cr-Si-Ti and CaO-SiO 2 -20%Al 2 O 3 -MgO-TiOx slags were used to estimate the titanium content of silicon-added stainless steel. Experiments were also conducted using Fe-Al-Ti melts in equilibrium with CaO-SiO 2 -Al 2 O 3 -TiO x slags saturated with MgO. In this case most of the titanium in the slag is present as TiO 2 (Ti 4ϩ ). The present results were used to predict the titanium content of aluminum-killed steel in equilibrium with ladle slags containing titanium oxide and the predictions agreed with plant data.KEY WORDS: ladle slags, titanium oxide, activity, silicon-added stainless steel, aluminum-killed steel. For the equilibrium experiments between ladle type slags and Fe-C sat -Ti alloys or Fe-C sat -18%Cr-Ti, 5.0 g of slag was made by mixing the master slag and TiO 2 , and 10 g of the master alloys were equilibrated in a graphite crucible at 1 873 K for 24 hr under a CO atmosphere. And for the equilibrium experiments between ladle type slags and Fe-Al-Ti alloys, 8.0 g of slags uniformly mixed and 15-20 g of alloys were melted in a MgO crucible under a purified Ar atmosphere. Since the Fe-Al-Ti experiments were conducted in MgO crucibles, the slags were saturated with MgO and contained significantly more MgO. Preliminary experiments indicated for these experiments that 4 hr was sufficient to achieve equilibrium. The crucible containing a sample was then pulled out of the furnace and rapidly quenched in an Ar gas stream. The ground slag samples and the metals were chemically analyzed for CaO, SiO 2 , Al 2 O 3 , MgO, TiO 1.5 and TiO 2 and for C, Si and Ti, respectively. Chemical AnalysisThe SiO 2 content in the slag and silicon in me...

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“…Series of studies have been performed to investigate the reduction and distribution behaviours of titanium oxides between hot metal and slag [8,[10][11][12][13][14][15][16][17][18][19][20]. Benesch et al [21] studied the free enthalpy, dissolution of Ti in hot metal, activities and activity coefficients of Ti dissolved in hot metal and TiO 2 in slag in an equilibrium condition, as well as the transfer coefficient and the solubility coefficient of titanium in hot metal. However, the Al 2 O 3 contents(∼7 wt-%) in the slag investigated were much lower than that in the current Chinese BF slags (∼15 wt-% Al 2 O 3 ).…”

Section: Introductionmentioning

confidence: 99%

Titanium distribution between blast furnace slag and iron for blast furnace linings protection

Sun

Wang

Chu

et al. 2018

Ironmaking & Steelmaking

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Titanium-bearing materials are commonly adopted for the protection of blast furnace hearth in the actual practices. In this study, the effects of smelting temperature, amount of TiO 2 addition, slag basicity and MgO content on the titanium distribution behaviours were experimentally studied using high-temperature smelting, equilibrium and quenching with EPMA techniques. The experiments results show that the increases in smelting temperature and TiO 2 content in the slag contributes to the transformation of titanium from the slag into the iron. While the increasing slag binary basicity suppresses the reduction of titanium oxides. The change of MgO content has a slight influence on the titanium distribution. The plant data from the operating blast furnace were also extracted for comparisons and the trends well agree with the present measurements.

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Equilibrium of reduction of titanium oxides from blast-furnace-type slags of the CaO-MgO-SiO2-Al2O3-TiO2 system in liquid phases

Cited by 11 publications

References 3 publications

Dissection Investigation of Ti(C,N) Behavior in Blast Furnace Hearth during Vanadium Titano-magnetite Smelting

Dissection Investigation of Ti(C,N) Behavior in Blast Furnace Hearth during Vanadium Titano-magnetite Smelting

Thermodynamics of Titanium Oxide in Ladle Slags.

Titanium distribution between blast furnace slag and iron for blast furnace linings protection

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