An experimental study on thermal decomposition behavior of magnesite

Tian, Laijin; Tahmasebi, Arash; Yu, Jianglong

doi:10.1007/s10973-014-4068-9

Cited by 52 publications

(24 citation statements)

References 23 publications

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“…The peak at 481.1 ∘ C is ascribed to the decomposition of magnesite. 32 The shoulder peaks at 641.7 ∘ C and 715.8 ∘ C should be assigned to the two-step decomposition of dolomite and calcite. 33 The TG curve of FGD gypsum exhibits three mass loss steps from 44 ∘ C to 800 ∘ C, contrasted with the TG curve of pure gypsum with only one mass step in the attached figure.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced adsorption capacity for phosphate in wastewater from thermally activated flue gas desulfurization gypsum

Cheng

Chen

Zou

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND In this study, a flue gas desulfurization (FGD) gypsum was calcined as phosphate sorbent materials for the remediation of phosphate wastewater. RESULTS In addition to the main crystalline phase of gypsum, FGD gypsum contains a small quantity of quartz, dolomite, calcite and magnesite. Moreover, FGD gypsum has a prismatic structure with a dense and smooth surface, whereas a pore structure and flaky structure appear with increasing calcination temperature. The kinetic adsorption process was well described by a pseudo‐second‐order model with a high correlation coefficient (R2 > 0.99). The adsorption isotherms indicated that phosphate removal can be fitted by the Langmuir model. CONCLUSIONS Calcination improved the performance of FGD gypsum towards phosphate sorption. The precipitation following chemical adsorption dominated the phosphate removal by the calcined FGD gypsum, and phosphate was ultimately immobilized by hydroxyapatite. Calcined FGD gypsum has excellent capacity for phosphate removal for three reasons: an enhanced content of active Ca by calcination, a novel nanoscale prismatic structure with a high specific surface area, and a favorable reactivity and alkaline environment produced by the decomposition of magnesite, dolomite and calcite. © 2017 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

“…Four peaks (approximately 191.8, 481.1, 641.7, 715.8 °C) can be observed in the curve of CO 2. The peak at 481.1 °C is ascribed to the decomposition of magnesite . The shoulder peaks at 641.7 °C and 715.8 °C should be assigned to the two‐step decomposition of dolomite and calcite …”

Section: Resultsmentioning

confidence: 99%

Enhanced adsorption capacity for phosphate in wastewater from thermally activated flue gas desulfurization gypsum

Cheng

Chen

Zou

et al. 2018

J of Chemical Tech & Biotech

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“…The results of Landrou et al [23] provided that MgO acts as an anti-dispersant for deflocculated kaolin slurries by stopping the activity of the NaHMP dispersant. However, many studies indicated that magnesite and magnesium hydroxide are usually calcined to produce MgO [42,43]. Thus, in this study, various MgCO 3 amounts were introduced into the mixed KT2/dispersants in order to study their effects on the rheological behavior of dispersed slurries with an optimal amount of NaSi or NaHMP dispersants.…”

Section: Continuous Flow Testsmentioning

confidence: 99%

Kaolinite-Magnesite Based Ceramics. Part I: Surface Charge and Rheological Properties Optimization of the Suspensions for the Processing of Cordierite-Mullite Tapes

et al. 2019

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The present study aimed at investigating the influence of the concentration of sodium silicate and sodium hexametaphosphate on the dispersion of an aqueous kaolinitic clay slurry regarding further use for the tape casting process. The zeta potential of the kaolinitic clay slurry matched the requirements for tape casting. The addition of magnesite in the kaolinitic slurries tended to increase the zeta potential towards the required limit values. Despite this, the further addition of surfactants allowed improving the zeta potential in agreement with the tape casting conditions. Accordingly, the rheological behavior, under continuous and oscillatory flow conditions, of various mixtures of magnesite and a kaolinitic clay was studied. Regarding the pH and the zeta potential measurements, the E–F attraction prevailed at low pH value, and F–F or E–E attraction was predominant at high pH value. All slurries exhibited a shear thinning behavior, which was well-correlated by the Herschel–Bulkley model. It appeared that the best stability for the kaolinitic clay slurries was obtained while using 0.4 mass% and 1.2 mass% of sodium hexametaphosphate and sodium silicate, respectively. An increase in the magnesite concentration above 6 mass% led to a complex behavior with low cohesion energy due to the occurrence of soluble complexes.

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“…The results of Landrou et al [23] provided that MgO acts as an anti-dispersant for deflocculated kaolin slurries by stopping the activity of the NaHMP dispersant. However, many studies indicated that magnesite and magnesium hydroxide are usually calcined to produce MgO [42,43]. Thus, in this study, various MgCO3 amounts were introduced into the mixed KT2/dispersants in order to study their effects on the rheological behavior of dispersed slurries with optimal amount of NaSi or NaHMP dispersants.…”

Section: Nahmp Content (Mass%)mentioning

confidence: 99%

Kaolinite-Magnesite Based Ceramics. Part I: Surface Charge and Rheological Properties Optimization of the Suspensions for the Processing of Cordierite-mullite Tapes

Hammas¹,

Lecomte‐Nana

Azril³

et al. 2019

Preprint

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The present study aimed at investigating the influence of the concentration of sodium silicate and sodium hexametaphosphate on the dispersion of an aqueous kaolinitic clay slurry regarding further use for the tape casting process. The zeta potential of the kaolinitic clay slurry matched the requirements for tape casting. The addition of magnesite in the kaolinitic slurries tended to increase the zeta potential towards the required limit values. Despite, the further addition of surfactants allowed improving the zeta potential in agreement with the tape casting conditions. Accordingly, the rheological behavior, under continuous and oscillatory flow conditions, of various mixtures of magnesite and a kaolinitic clay was studied. Regarding the pH and the zeta potential measurements, the E–F attraction prevailed at low pH value, and F–F or E–E attraction was predominant at high pH value. All slurries exhibited a shear thinning behavior, which was well-correlated by Herschel–Bulkley model. It appeared that the best stability for the kaolinitic clay slurries was obtained while using 0.4 mass% and 1.2 mass% of sodium hexametaphosphate and sodium silicate respectively. An increase in the magnesite concentration above 6 mass% led to a complex behavior with low cohesion energy due to the occurrence of soluble complexes.

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An experimental study on thermal decomposition behavior of magnesite

Cited by 52 publications

References 23 publications

Enhanced adsorption capacity for phosphate in wastewater from thermally activated flue gas desulfurization gypsum

Enhanced adsorption capacity for phosphate in wastewater from thermally activated flue gas desulfurization gypsum

Kaolinite-Magnesite Based Ceramics. Part I: Surface Charge and Rheological Properties Optimization of the Suspensions for the Processing of Cordierite-Mullite Tapes

Kaolinite-Magnesite Based Ceramics. Part I: Surface Charge and Rheological Properties Optimization of the Suspensions for the Processing of Cordierite-mullite Tapes

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