Microstructural characteristics of refractory magnesia produced from macrocrystalline magnesite in China

Guo, Zongqi; Ding, Qiang; Liu, Lei; Zhang, Xiaohui; Luo, Xingyuan; Ding, Feng

doi:10.1016/j.ceramint.2021.04.285

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…CO, CO 2 , O 2 , and Mg vapor reached equilibrium through reactions ( 2)- (7). Under the embedded carbon condition, the partial pressure of CO was 35.46 kPa, and the partial pressure of N 2 was 65.86 kPa.…”

Section: Discussionmentioning

confidence: 98%

“…Under the embedded carbon condition, the partial pressure of CO was 35.46 kPa, and the partial pressure of N 2 was 65.86 kPa. 35,36 According to the chemical thermodynamic data, 37 the equilibrium partial pressure of each gas phase in this experimental system at each temperature can be calculated according to Equations ( 2), (3), and (7), as shown in Table 2. As the sintering temperature rose from 1100 to 1600 • C, the partial pressure of CO 2 in this system gradually decreased, and the partial pressure of O 2 and Mg vapor gradually increased, indicating that increasing sintering temperature promoted the occurrence of reaction (7).…”

Section: Discussionmentioning

confidence: 99%

“…35,36 According to the chemical thermodynamic data, 37 the equilibrium partial pressure of each gas phase in this experimental system at each temperature can be calculated according to Equations ( 2), (3), and (7), as shown in Table 2. As the sintering temperature rose from 1100 to 1600 • C, the partial pressure of CO 2 in this system gradually decreased, and the partial pressure of O 2 and Mg vapor gradually increased, indicating that increasing sintering temperature promoted the occurrence of reaction (7). The above calculations illustrated that CO diffused into pseudomorphs through the interparticle pores and inter-grain pores, and a V-S reaction occurred with MgO microcrystals within the pseudomorphs and the MgO particles generating Mg vapor (reaction 7), which diffused to the surface of the particles and left pores in situ (Figure 15D,E).…”

Section: Discussionmentioning

confidence: 99%

“…Magnesia-based refractories have been widely used in high-temperature industrial furnaces, such as steel ladles, converters, and cement rotary kilns, because of their high refractoriness, excellent high-temperature strengths, and remarkable slag resistance. [1][2][3][4][5][6][7][8][9] Conventional magnesiabased refractories are prepared with MgO-based aggregates and magnesia powder as well as other powder. [10][11][12] Magnesia-based aggregates are mainly prepared with magnesite by electrical fusion 13 or sintering methods.…”

Section: Introductionmentioning

confidence: 99%

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Effect of sintering atmosphere on microstructures and properties of synthesized microporous MgO refractory raw material

Liu

Yan

Chen

et al. 2023

Int J Applied Ceramic Tech

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Effects of sintering atmosphere on the microstructure and strength of magnesite were investigated using magnesite powder as raw material through X‐ray diffraction, scanning electron microscopy, mercury porosimetry measurement, and so on. The results showed that the sintering atmosphere strongly affected the sintering behavior of magnesite. The specimens sintered in the reducing atmosphere had more and finer micro‐sized pores inside the MgO particles compared with that in the oxidizing atmosphere at the same sintering temperature. Besides, MgO refractory raw material containing porous MgO microparticles with core–shell structure was obtained through the carbothermal reduction of MgO microparticles and subsequent oxidation of Mg vapor at the surface of MgO particles at 1500°C in the reducing atmosphere. At the reducing atmosphere and 1500°C, the microporous MgO refractory raw material with the core–shell structure of external dense and internal porous had an apparent porosity of 22.1% and a compressive strength of 51.6 MPa.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of sintering atmosphere on microstructures and properties of synthesized microporous MgO refractory raw material

Liu

Yan

Chen

et al. 2023

Int J Applied Ceramic Tech

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“…Due to the slow cooling of the samples, tricalcium silicate dissolved into dicalcium silicate and lime (CaO), according to Equation ( 6) [30]. Subsequently, lime reacted with spinel in the proximity of the transition zone to form tricalcium aluminate, with simultaneous precipitation of periclase (MgO), according to Equation (7).…”

Section: Corrosion Resistance Of Ceramics To Clinkermentioning

confidence: 99%

Corrosion Resistance of Novel Fly Ash-Based Forsterite-Spinel Refractory Ceramics

Nguyen

Sokolar

2022

Materials

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This article aims to investigate the corrosion resistance of novel fly ash–based forsterite–spinel (Mg2SiO4-MgAl2O4) refractory ceramics to various corrosive media in comparison with reactive alumina–based ceramics. Because fly ash is produced in enormous quantities as a byproduct of coal-burning power stations, it could be utilized as an affordable source of aluminum oxide and silicon oxide. Corrosion resistance to iron, clinker, alumina, and copper was observed by scanning electron microscope with an elemental probe. The influence on the properties after firing was also investigated. Fly ash–based and reactive alumina–based mixtures were designed to contain 10%, 15% and 20% of spinel after firing. Raw material mixtures were sintered at 1550 °C for two hours. X-ray diffraction analysis and scanning electron microscopy were used to analyze sintered samples. The apparent porosity, bulk density, modulus of rupture, and refractory and thermo–mechanical properties were also investigated. The experimental results disclosed that the modulus of rupture, thermal shock resistance and microstructure were improved with increasing amounts of spinel in the fired samples. An analysis of the transition zones between corrosive media and ceramics revealed that all mixtures have good resistance against corrosion to iron, clinker, aluminum and copper.

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Effects of key factors on the densification and grain growth behaviour of sintered magnesia from magnesite

Ren

2022

Ceramics International

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Microstructural characteristics of refractory magnesia produced from macrocrystalline magnesite in China

Cited by 9 publications

References 6 publications

Effect of sintering atmosphere on microstructures and properties of synthesized microporous MgO refractory raw material

Effect of sintering atmosphere on microstructures and properties of synthesized microporous MgO refractory raw material

Corrosion Resistance of Novel Fly Ash-Based Forsterite-Spinel Refractory Ceramics

Effects of key factors on the densification and grain growth behaviour of sintered magnesia from magnesite

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