Silicothermic Reduction of Dolomite Ore Under Inert Atmosphere

Morsi, I.M.; Barawy, K. A. El; Morsi, M. B.; Abdel-Gawad, S. R.

doi:10.1179/cmq.2002.41.1.15

Cited by 47 publications

(10 citation statements)

References 12 publications

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“…The increasing of CaO content might leads to the formation of more Ca2SiO4. The results are in agreement with a previous report in which dolomite was reduced in the Ar atmosphere [18]. Calcinated Thanh Hoa dolomite has the CaO/MgO ratio of approx.…”

Section: Effect Of Cao/mgo Ratiosupporting

confidence: 93%

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Silicothermic Reduction of Thanhhoa Dolomite: Thermodynamic and Experimental

Duong

Vu²,

vụ³

et al. 2021

Acta Metall Slovaca

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Thermodynamic and experimental studies was carried out on the process of Thanhhoa dolomite reduction to produce magnesium. Thermodynamically studied on the effect of pressure and temperature on reduction was carried out together with verification experiment. Results show that at appropriate temperature and vacuum pressure, Thanhhoa dolomite can be reduced using ferrosilicon as the reductant. The higher level of vacuum, the lower temperature required for reduction. Thermodynamic calculation pointed out that at a vacuum pressure of 600 Pa, the reduction temperature could be as low as 1140 °C. Experiment results indicated that at although reduction could be done at 1150 °C, the process efficiency was low, generally below 20%. Process efficiency enhanced as temperature increase and reaches the highest value of 85,8% at 1250 °C (25 wt.% ferrosilicon). The amount of ferrosilicon used also has influenced the process efficiency. After three hours of reduction, the obtained magnesium was very high in purity, 99.3%.

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Section: Effect Of Cao/mgo Ratiosupporting

confidence: 93%

“…The obtained calcined dolomite was mixed with ferrosilicon (FeSi) reductant and 3 wt.% CaF2 catalysts [16,17]. The mixture then mounded into a cylindrical mould of 15 mm in diameter and pressed at 60 MPa using a hydraulic press [18].…”

Section: Methodsmentioning

confidence: 99%

Silicothermic Reduction of Thanhhoa Dolomite: Thermodynamic and Experimental

Duong

Vu²,

vụ³

et al. 2021

Acta Metall Slovaca

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show abstract

“…An interesting phenomenon could also be found in Fig. 7 that the reduction rate of MgO decreased due to the excessive content of CaF 2 , which was consistent with the results reported by other researchers [28].With the increase of reduction temperature, this phenomenon was more obvious. That was, with the increase of temperature, the content of CaF 2 decreased when the reduction rate of MgO reached the maximum.…”

Section: Effect Of Caf 2 On Reduction Rate Of Mgo In Prefabricated Pelletssupporting

confidence: 89%

The effect of calcium fluoride on extracting magnesium from magnesite and calcium carbonate by silicothermal reduction in flowing argon

Guo

Han

et al. 2022

J min metall B Metall

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At present, the production of magnesium is mainly carried out semi-continuously with ferrosilicon as reducing agent under high temperature and high vacuum. In order to continuously produce magnesium, anew method of extracting magnesium from low-grade magnesite and calcium carbonate by silicothermal method in flowing inert gas was proposed. The effects of calcium fluoride(CaF2)on decomposition rate, decomposition kinetics, reduction rate of magnesia and crystal type of dicalcium silicate in reduction slag were investigated in the paper. The experimental results showed that calcium fluoride could accelerate the decomposition of carbonate, and had no side effect on the calcined products. In addition, the analysis results of DTA curves showed that calcium fluoridecould reduce the decomposition reaction activation energy and the reaction temperature of carbonatein the prefabricated pellets. The results of reduction experiments showed that proper calcium fluoridecould promote the reduction rate of magnesia, and in the temperature range of 1250? ~ 1350?, with same timeframe, the corresponding calcium fluoride contents were5%, 3% and 1% respectively when the reduction rate reached the maximum. Excessive calcium fluoride could reduce the reduction rate of magnesia, but it couldpromote the transformation of dicalcium silicate to ? phase in the reduction slag.

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“…These studies rely on reducing calcination to achieve continuous production of Mg. Other researchers used an inert gas to replace the vacuum state. For example, Morsi studied the kinetics of the Mg process by using a silicothermic reduction process at 1 L/min argon (Ar) flow and found that the pellet reduction rate was up to 92% in an Ar atmosphere [19,20]. Further kinetics analyses of Mg production in Ar have been performed by Wulandari [21] and Chen [22].…”

Section: Introductionmentioning

confidence: 99%

Nucleation and Condensation of Magnesium Vapor in Argon Carrier

Han

Guo

et al. 2020

Metals

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The nucleation and condensation of Magnesium (Mg) vapor carried by argon gas (Ar) were examined. The condensation of Mg vapor at a heat source temperature of 1273–1473 K and Ar flow rate of 0.1–0.4 m3/h was analyzed. The result indicated that the condensation temperature is affected by the heat source temperature and Ar flow rate, and the condensation temperature of Mg vapor was 1013.3 K at a heat source temperature of 1473 K and Ar flow rate of 0.2 m3/h. The effects of Mg vapor partial pressure and temperature of the condensation zone on the nucleation and condensation of Mg vapor carried by Ar were calculated and analyzed in terms of atomic collisions and critical nucleation radius. Increased vapor oversaturation and decreased condensation temperature were favorable for liquid nucleation growth. The Mg condensation products in Ar flow rate of 0.2 m3/h at a heat source temperature of 1473 K were analyzed by XRD, SEM, and EDS, which indicated that the condensed product was of high purity and not easily oxidized in Ar flow. In this paper, the quality of Mg vapor condensation was controlled, which provided the theoretical and experimental basis for a continuous Mg production process.

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Silicothermic Reduction of Dolomite Ore Under Inert Atmosphere

Cited by 47 publications

References 12 publications

Silicothermic Reduction of Thanhhoa Dolomite: Thermodynamic and Experimental

Silicothermic Reduction of Thanhhoa Dolomite: Thermodynamic and Experimental

The effect of calcium fluoride on extracting magnesium from magnesite and calcium carbonate by silicothermal reduction in flowing argon

Nucleation and Condensation of Magnesium Vapor in Argon Carrier

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