Thermodynamic Calculation of Liquidus Surface of FeOx–CaO–SiO2 System

Chen, Chunlin; Zhang, Ling; Lü, Liming; Sun, Shouyi

doi:10.2355/isijinternational.50.1523

Cited by 10 publications

(10 citation statements)

References 18 publications

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“…While the thermodynamic calculation results for the effect of MgO and Al 2 O 3 on the liquid region of the FeO-SiO 2 -CaO system at 1300°C [16] show that existence of MgO or Al 2 O 3 changes the position of liquid phase region, but there are almost no changes in the area of liquid region. This means that, liquid slag can be formed at 1300°C by controlling the FeO amount in the briquette after reduction.…”

Section: Thermodynamic Basismentioning

confidence: 91%

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Separation of iron-nickel alloy nugget from limonitic laterite ore using self-reduction

Ju¹,

Ryom²,

Hong³

2018

J min metall B Metall

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To efficiently extract nickel from low grade limonitic laterite ore, a separation method of iron-nickel alloy nugget by selfreduction of coal composite limonitic laterite ore briquette was investigated. In this investigation, in order to decrease the separation temperature of iron-nickel alloy nugget, the selective reduction by control of C/O ratio was introduced and reductant added in the briquette was inadequate for the reduction of nickel and iron. Nickel was preferentially reduced in the reduction process, while iron was partially reduced due to the lack of reductant. After reduction, a certain amount of FeO existed in the reduced product. This residual FeO had a great role in the formation of low melting point slag, which could promote the formation and the separation of iron-nickel alloy nugget at relatively low temperature. In this investigation, the reduction experiments were all conducted at 1300°C. To evaluate the formation and the separation of iron-nickel alloy nugget in the reduction process, we observed the patterns of reduced products under different C/O ratio, CaO addition ratio and holding time conditions. And then the effect of C/O ratio and CaO addition ratio on nickel content of nugget and nickel recovery ratio were investigated. The results showed that 0.7 of C/O ratio, 8% of CaO addition ratio and 40min of holding time were suitable for the separation of iron-nickel alloy nugget from limonitic laterite ore. Nickel and iron content of the nugget and the nickel recovery ratio were 4.75%, 89.51% and 85%, respectively. Nuggets were easily separated from slag by crushing and screening. This separation method could be applied to any limonitic laterite ore by adjusting C/O ratio and CaO addition ratio.

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Section: Thermodynamic Basismentioning

confidence: 91%

“…The calculated liquid region of the FeO-SiO 2 -CaO system under the temperature of 1300°C and different oxygen partial pressures is shown in Fig. 2 [16].…”

Section: Thermodynamic Basismentioning

confidence: 99%

See 1 more Smart Citation

Separation of iron-nickel alloy nugget from limonitic laterite ore using self-reduction

Ju¹,

Ryom²,

Hong³

2018

J min metall B Metall

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“…Some thermodynamic modelling work has been carried out to generate the phase relationships in the FeOx-CaO-SiO 2 -MgO-Al 2 O 3 system [17][18][19][20], which provides useful information for understanding the behavior of the melt. However, thermodynamic modelling of the SFCA phase formation during sintering has not been attempted.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous study [19], MPE was used to predict the effects of sinter composition and the oxygen partial pressure on the liquidus of the melt formed during sintering. In this study, a solid solution model for describing SFCA phase was developed and has been incorporated in MPE.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Modelling of Iron Ore Sintering Reactions

2019

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Silico-ferrite of calcium and aluminum (SFCA) is one of the most commonly-produced phases in fluxed iron-ore sintering, and has long been regarded as an important bonding phase in industrial sinters. It is thus considered to have a significant effect on sinter quality. In this study, a solid solution model and database has been developed for the SFCA phase, and has been incorporated into the thermodynamic software, Multi-Phase Equilibrium (MPE). MPE calculations were compared with the in situ X-ray powder diffraction (XRD) observations of the formation of SFCA phase during sintering. The effects of the raw material composition, temperature and the oxygen partial pressure on the formation of mineral phases in the sinter, as well as the viscosity of the melt formed during sintering under equilibrium conditions, were modelled using MPE. The results show that the formation of SFCA phase can be promoted by increasing oxygen partial pressure and basicity of the raw material. Increases of Al2O3 and MgO content have no significant effect on the SFCA formation under equilibrium condition. The increase of oxygen partial pressure (10−3 atm or above) and basicity also leads to a decrease in melt viscosity, which enhances the fluidity of the melt, and hence, the assimilation of the sinter. However, increases of Al2O3 and MgO result in the increase of melt viscosity.

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