The effect of magnesite calcination conditions on magnesia hydration

Birchal, Viviane Santos; Rocha, Sônia Denise Ferreira; Ciminelli, Virgínia S. T.

doi:10.1016/s0892-6875(00)00146-1

Cited by 149 publications

(83 citation statements)

References 5 publications

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“…Como os cloretos de cálcio e de magnésio aceleram a hidratação da magnésia (Fig. 2), a dissociação dos íons Mg 2+ e OH -ocorre rapidamente no meio líquido e a nucleação do hidróxido de magnésio pode ser identificada tanto na superfície das partículas de MgO quanto no volume da suspensão supersaturada [23]. A atuação desses aditivos pode estar associada ao seu efeito em promover a ativação de um maior número de núcleos de brucita.…”

Section: Resultsunclassified

Influência dos sais MgCl 2 e CaCl 2 no comportamento de hidratação do MgO

et al. 2018

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INTRODUÇÃOO óxido de magnésio (MgO) ou magnésia é uma importante matéria-prima para a indústria de refratários e entre as diversas fontes disponíveis deste material, sínter, magnésia cáustica ou grãos eletrofundidos, isoladamente ou em combinação com alumina (Al 2 O 3 ) ou cromita (Cr 2 O 3 ), são os mais utilizados para tal finalidade. O potencial de aplicação do MgO em refratários se deve ao fato deste apresentar elevada refratariedade e contribuir para o aumento da resistência à corrosão destes produtos quando em contato com escórias alcalinas. Além disso, quando em combinação com o óxido de alumínio e exposto a temperaturas acima de 1200 °C, o MgO pode levar à formação de espinélio

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Section: Resultsunclassified

Influência dos sais MgCl 2 e CaCl 2 no comportamento de hidratação do MgO

et al. 2018

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“…2. 4 increases which decreases the compressive strength. Therefore, the amount of magnesium oxysulfate decreases due to the increase of MgSO 4 or the cement paste content decreases which affects the mechanical properties or compressive strength.…”

Section: Methodsmentioning

confidence: 98%

“…Dead-burned magnesia (MgO), produced at high temperatures, is mainly utilized in the refractory industry. The rate and extent of hydration are factors that affect the functional performance of both types of magnesia [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of grain size of MgO powder on the physicomechanical properties of magnesium oxysulfate cement paste

Kandeel¹

2015

Epitoanyag - JSBCM

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the effect of mgo powder on the water demand, bulk density, water absorption and compressive strength of magnesium oxysulfate cement paste as a function of mgo grain sizes has been investigated. in this study three mixes were used. they are composed from an egyptian mgo powder of a grain size < 90 µm with different contents of mgso 4 (16.66, 21.10 and 28.60 m%). the results of compressive strength of cement pastes cured in air at room temperature for 7 days noted that the mix containing 16.66 m% of mgso 4 gives the best compressive strength. the other three mixes (m1, m2 and m3) were prepared with a constant percentage of mgso 4 (16.66 m%) and three different grain sizes of mgo; normal (as received), < 300 µm and < 150 µm. the water demand, bulk density, water absorption and compressive strength of hardened magnesium oxysulfate cement pastes cured in air at room temperature for 3, 7, and 28 days were studied. compressive strength retention coefficient was calculated. the result showed that as the grain size decreases the compressive strength of hardened magnesium oxysulfate cement pastes increases. keywords: grain size, oxysulfate cement, magnesium cement

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“…Both of the above volumetric instabilities represent a drawback when slag is used as a raw material for recycling. In addition, the volumetric instabilities can be combined with a retarded hydration when slags containing free MgO or MgO-based compounds are used in the production of mortars or concretes [2][3][4][5]. It is generally accepted that a better stability could be obtained when the slag is pre-treated by different methods such as long time weathering of the granulated slag outside the slag pits, treatment of the liquid slag by injecting oxygen and silica, autoclaving of the slag in baskets [6,7] and others [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Production and Compression Strength of Mortars Containing Unprocessed Waste Powdered Steel Slag

et al. 2017

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This paper deals with the production of mortars prepared using a commercial CEMIIB-S 42.5N cement, a natural aggregate, steelmaking slag, a superplasticizer and water. The as-received unprocessed steel slag was milled by a hammer mill and then sieved to obtain batches with different maximum particle size. Each batch was used, together with the other components, in the production of mortars which were tested, by compression and water absorption, after different aging times in order to evaluate their long term stability. Several slag-free samples were also prepared as reference materials. All mortars were prepared with fixed aggregate/cement ratio (6/1), superplasticizer/cement ratio (s/c) and water/cement ratio (w/c). It has been demonstrated that an adequate protocol for the preparation and the use of slag containing particles with 2500 µm maximum size lead to the production of materials with mechanical properties suitable for civil engineering applications after aging for 28, 90 and 180 days. However, samples containing slag particles with size equal or greater than 1000 µm display a decay of mechanical properties after longer aging in water or after accelerated aging.

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The effect of magnesite calcination conditions on magnesia hydration

Cited by 149 publications

References 5 publications

Influência dos sais MgCl 2 e CaCl 2 no comportamento de hidratação do MgO

Influência dos sais MgCl 2 e CaCl 2 no comportamento de hidratação do MgO

Effect of grain size of MgO powder on the physicomechanical properties of magnesium oxysulfate cement paste

Production and Compression Strength of Mortars Containing Unprocessed Waste Powdered Steel Slag

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