On the kinetics of magnesia hydration in magnesium acetate solutions

Filippou, Dimitrios; Katiforis, N.; Papassiopi, Nymphodora; Adam, Kenneth R.

doi:10.1002/(sici)1097-4660(199904)74:4<322::aid-jctb35>3.0.co;2-l

Cited by 90 publications

(105 citation statements)

References 7 publications

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“…Many studies have been carried out to understand the hydration mechanisms of magnesia [6][7][8][9][10] in order to develop anti-hydration techniques. [11][12][13][14][15] Nevertheless, the results attained are quite diverse due to differences in the magnesia source, purity, temperature, hydration time and the chemical environment where the hydration is performed.…”

Section: Introductionmentioning

confidence: 99%

Chelants to inhibit magnesia (MgO) hydration

Amaral¹,

Oliveira

Bonadia³

et al. 2011

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Chelants to inhibit magnesia (MgO) hydration

Amaral¹,

Oliveira

Bonadia³

et al. 2011

Ceramics International

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“…In the experiment conducted in the present study, the hydration process of MgO occurs at a pH value of 10±0.5 and can be significantly decreased in a strong basic pH region due to a low degree of solubility of MgO [19]. It should also be mentioned here that an extremely rapid hydration rate of magnesia will result in the formation of relatively larger magnesium hydroxide aggregates, which comprise submicroscopic crystallites of a wider surface area-a particle morphology that is not acceptable for some applications [20].…”

Section: Causticization-hydration Process Of the Intermediate Flotatimentioning

confidence: 99%

Processing of refractory materials using various magnesium sources derived from Zinelbulak talc-magnesite

Hojamberdiev

Arifov

Tadjiev

et al. 2011

Int J Miner Metall Mater

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Magnesia (MgO) is widely used in the production of refractory materials due to its high melting point, high thermal shock, and excellent slag resistance. The properties of refractory materials depend upon magnesia sources and processing parameters. In this work, three different magnesium sources, namely, magnesium hydroxide concentrate, magnesium carbonate concentrate, and intermediate flotation concentrate, were obtained from the Zinelbulak talc-magnesite, Uzbekistan, by causticization-hydration and flotation processes, respectively. A series of refractory materials were prepared on the basis of these magnesium sources, and their effects on physico-mechanical properties and microstructures were investigated as a function of sintering temperature, molding pressure, and the particle size of magnesium sources. The experimental results showed that a refractory material obtained from the magnesium hydroxide concentrate at 1600°C for 4 h demonstrated favorable parameters due mainly to a higher degree of contact among fine particles. The results obtained from X-ray diffraction and optical microscopy confirmed the presence of periclase and forsterite as the predominant phases in refractory specimens. The prepared refractory materials meet the requirements of the State Standards (Nos.4689-94 and 14832-96) for magnesia and forsterite refractories, respectively. It is, therefore, suggested herein that the use of different magnesium sources derived from the Zinelbulak talc-magnesite will offer the potential to provide economic benefits in the refractory industry.

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“…Assuming that s , r o , M s , k, and C Bg remain constant at a given temperature, Eq. [8] can be rewritten as [9] where k r is a new constant. The term (1 Ϫ (1 Ϫ X) 1/3 ) should be a linear function of time if the reduction is controlled by the chemical reaction at the interface between the product…”

Section: Chemical Reaction As the Rate-controlling Stepmentioning

confidence: 99%

“…To encounter the particles with a range of size distributions, Filippou et al [8] have suggested an elegant way of processing the experimental data. The powder bed can be assumed to contain particles of a number of small size ranges.…”

Section: Chemical Reaction As the Rate-controlling Stepmentioning

confidence: 99%

Reduction kinetics of Fe2MoO4 fine powder by hydrogen in a fluidized bed

Morales

Sichen

Seetharaman

2003

Metall Mater Trans B

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Iron molybdate (Fe 2 MoO 4 ) powders with an average particle size of 100 m were reduced by hydrogen using a fluidized-bed batch reactor in the temperature range of 923 to 1173 K. The extent of the reaction was followed as a function of time by gas chromatography. The fluidizing-gas velocity was set at about 1.5 times the minimum fluidization velocity. The ratio of the height of the static bed to its diameter is about 1. Under the prevailing experimental conditions, it was found that the chemical reaction was the rate-controlling factor. The activation energy for this process was 158 Ϯ 17 kJ/mol. The crystal size of the Fe 2 Mo powder produced at lower temperatures was in the nanometer range, indicating the possibility of mass production of alloys and intermetallics in the nanorange, using a fluidized bed.

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On the kinetics of magnesia hydration in magnesium acetate solutions

Cited by 90 publications

References 7 publications

Chelants to inhibit magnesia (MgO) hydration

Chelants to inhibit magnesia (MgO) hydration

Processing of refractory materials using various magnesium sources derived from Zinelbulak talc-magnesite

Reduction kinetics of Fe2MoO4 fine powder by hydrogen in a fluidized bed

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