Investigation on the influence factors for preparing mullite-whisker-structured porous ceramic

Xu, Linfeng; Xi, Xiuan; Zhu, Wenli; Shui, Anze; Dai, Wubin

doi:10.1016/j.jallcom.2015.07.154

Cited by 45 publications

(15 citation statements)

References 30 publications

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“…They are used to produce high performance lightweight aluminum-silicon alloys, to fabricate metallic fiber, the leading edge of supersonic aircraft and spaceships, and so on [3,16]. A concentration process is necessary in order to produce kyanite and sillimanite products from ores to meet industrial needs [17,18]. The traditional concentration methods are gravity and magnetic separation.…”

Section: Materials and Reagentsmentioning

confidence: 99%

The Flotation of Kyanite and Sillimanite with Sodium Oleate as the Collector

et al. 2016

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Kyanite and sillimanite are two polymorphic minerals with the same formula of Al 2 SiO 5 , but different crystal structures. Despite their high economic values, selectively recovering them by flotation is a challenge. In this study, the flotation behaviors of the two minerals with sodium oleate as the collector were examined at different pH conditions. Zeta potential measurement, infrared spectroscopic measurement, chemical speciation and X-ray photoelectron spectroscopy measurement were conducted to identify the underpinning mechanisms. It is found that the flotation behavior of both minerals is different under the same flotation condition. The flotation recovery of sillimanite is much higher than that of kyanite in the presence of the collector sodium oleate. Sodium oleate adsorbs onto the surfaces of kyanite and sillimanite mainly through the chemical interaction of the ionic-molecular dimers with aluminum atoms at pH 8.0. The higher sillimanite flotation recovery between the two minerals is related to the higher electrostatic charge densities of the aluminum atoms in six-fold coordination, which leads to the higher collector adsorption.

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Section: Materials and Reagentsmentioning

confidence: 99%

The Flotation of Kyanite and Sillimanite with Sodium Oleate as the Collector

et al. 2016

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“…Mullite is a scarce ceramic material with various interesting properties in nature [11][12][13][14][15][16]. Mullite ber is often used as reinforcing material of ceramics [17][18][19][20][21]. Mullite porous ceramics not only have high stability at high temperatures, but also are used in various situations because of their abundant pore structures [17,18,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Effect of Waste Glass Powder on Phase, Microstructure and Mechanical Properties of Mullite Based Porous Ceramics with Coal-series Solid Waste as Raw Materials

Lian¹,

Liu²,

Wang³

et al. 2020

Preprint

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Mullite based porous ceramics were successfully prepared by using a solid-phase method with gangue, slime and sawdust as raw materials. The effects of the content of glass powder and calcining temperature on microstructure and mechanical properties of the samples were systematically studied. It is found that glass powder can prevent the formation of Kyanite and reduce the synthesis temperature of mullite. The samples with 4% glass powder have a large amount of mullite calcined at 1150°C for 3h. Meanwhile, alumina in the sample is completely converted into mullite at 1180°C for 3h. Mullite content reaches 64.2wt%. The minimum apparent porosity is 31.22%, while the maximum volume density and diameter shrinkage are 1.74g/cm 3 and 8.48%, respectively. The ratio of pores of <8μm to those of 8~20μm is varied from 7:2 to 2:7, due to the addition of the glass powder. With increasing content of mullite, the flexural properties of the samples are increased from 7.7MPa to 28.36MPa. Therefore, with solid wastes as the resource, the porous ceramics have a bright prospect.

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“…The mullite forms in high alumina‐containing rocks at very high temperature but low pressure, thus, mullite rarely exists in natural rocks. However, mullite is an attractive engineering material as it has low thermal expansion and conductivity, high creep resistance, and corrosion stability together with suitable strength and fracture toughness, and is one of the crystalline phases most frequently found in the final phase composition of both traditional ceramics and new inorganic functional materials . The significant role of mullite in various materials has been reported in the large number of publications in recent years …”

Section: Introductionmentioning

confidence: 99%

“…However, mullite is an attractive engineering material as it has low thermal expansion and conductivity, high creep resistance, and corrosion stability together with suitable strength and fracture toughness, and is one of the crystalline phases most frequently found in the final phase composition of both traditional ceramics and new inorganic functional materials. [2][3][4][5][6][7][8] The significant role of mullite in various materials has been reported in the large number of publications in recent years. [9][10][11][12][13][14][15][16][17] Mullite whiskers, a special morphology of mullite crystal, have been considered as reinforcements in the high-temperature composites and porous ceramics for its excellent performance.…”

Section: Introductionmentioning

confidence: 99%

Preparation of mullite whiskers from kaolin via the addition of tribasic calcium phosphate

Zhang

et al. 2017

Int J Applied Ceramic Tech

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Mullite whiskers are potential candidates for improving the mechanical and thermal properties of ceramic, glass, and composite material. In this work, well‐developed whisker‐shaped mullite has been produced by adding tribasic calcium phosphate (Ca3(PO4)2) into kaolin before calcining in air. In the raw kaolin, rod‐like mullite crystal of ~0.5‐1.0 μm length and ~0.05‐0.2 μm diameter formed at 1350°C, and mullite whiskers were not be observed; however, by doping 6 wt% Ca3(PO4)2 into kaolin, mullite whiskers of ~5.5 μm length and ~0.05‐0.10 μm diameter grew at 1250°C. The formation of high aspect ratio of mullite whiskers can probably be explained by the synergistic effect of P2O5 and CaO, resulting in the formation of liquid phase with a relatively higher content of Si and a lower viscosity at low temperature of 1250°C, which facilitates the growth of mullite displaying acicular morphology. The results are of interest in producing high aspect ratio of mullite whiskers from kaolin at reduced calcination temperatures.

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Investigation on the influence factors for preparing mullite-whisker-structured porous ceramic

Cited by 45 publications

References 30 publications

The Flotation of Kyanite and Sillimanite with Sodium Oleate as the Collector

The Flotation of Kyanite and Sillimanite with Sodium Oleate as the Collector

Effect of Waste Glass Powder on Phase, Microstructure and Mechanical Properties of Mullite Based Porous Ceramics with Coal-series Solid Waste as Raw Materials

Preparation of mullite whiskers from kaolin via the addition of tribasic calcium phosphate

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