Bonding of Cement Clinker onto Doloma‐Based Refractories

Guo, Zhenbang; Palco, S.; Rigaud, M.

doi:10.1111/j.1551-2916.2005.00255.x

Cited by 19 publications

(18 citation statements)

References 2 publications

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“…Due to the fast cooling rate, SiO 2 mainly exists between hercynite crystals in the form of amorphous silicate. This is in agreement with the theoretical Journal of the Ceramic Society of Japan 123 [7] 595-600 2015 JCS-Japan analysis.…”

Section: The Formation Mechanism Of Hercynitesupporting

confidence: 90%

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Effect of SiO<sub>2</sub> addition on the synthesis of hercynite with high purity

Chen

Yan

et al. 2015

J. Ceram. Soc. Japan

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Hercynite as a kind of chrome-free and environmental friendly material is widely investigated. In this work, hercynite with high purity was synthesized using Fe 2 O 3 and Al 2 O 3 as raw material with SiO 2 addition under controlled temperature and atmosphere system. The phase and microstructure of the obtained product were investigated using XRD, SEM and TEM techniques. The effect of SiO 2 on the synthesis of hercynite with high purity was discussed from both theoretical and experimental aspects. The results show that SiO 2 addition lowers the formation temperature of the liquid phase, which promotes Al 2 O 3 to melt into the liquid phase and makes the formation of hercynite possible during the heating stage. During the process of crystallization, SiO 2 further facilitates the formation of hercynite by the peritectic reaction. During the fast cooling stage, SiO 2 in the form of amorphous silicate exists between hercynite crystals. Therefore hercynite with high purity and dense structure is successfully synthesized. It also shows that 1 mass % SiO 2 addition can effectively promote the crystal growth of hercynite and thus lead to dense structure.

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Section: The Formation Mechanism Of Hercynitesupporting

confidence: 90%

“…6). When the temperature reaches 1600°C, the balanced phases are the Journal of the Ceramic Society of Japan 123 [7] 595-600 2015 liquid phase composed of hercynite and Al 2 O 3 and residual solid Al 2 O 3 . In our experiment, the maximum temperature is 1600°C.…”

Section: Phase and Microstructure Characterizationmentioning

confidence: 99%

Effect of SiO<sub>2</sub> addition on the synthesis of hercynite with high purity

Chen

Yan

et al. 2015

J. Ceram. Soc. Japan

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“…Lafarge Corporation (St‐Constant; Quebec, Canada) supplied the cement raw meal used in the experiments. The sandwich testing method, at 1550°C, under a load of 5.3 kPa, is described in more detail elsewhere 8,9 . Four parameters were considered, including the silica ratio (SR), the alumina ratio, and the particle size for the raw meal, as well as the heating rate in the experiments.…”

Section: Methodsmentioning

confidence: 99%

Reaction Characteristics of Magnesia–Spinel Refractories with Cement Clinker

Guo¹,

Palco²,

Rigaud³

2005

Int J Applied Ceramic Tech

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The adherence ability of cement clinker on magnesia-spinel refractories is investigated, using a sandwich test, at 15501C for 30 min under a load of 5.3 kPa. Fractional factorial experiments determine that the silica ratio (SR)-SiO 2 /(Al 2 O 3 1-Fe 2 O 3 ) and particle size of raw meal, as well as heating rate, have a significant effect on adherence ability. Microstructural analyses indicate that the adherence ability depends upon reactions between clinker and refractories at high temperature. Only spinel reacts with CaO and 3CaO Á SiO 2 from clinker to form n-calcium aluminate (such as 3CaO Á Al 2 O 3 , 12CaO Á 7Al 2 O 3 , CaO Á Al 2 O 3 ), but there is no reaction between MgO and the clinker. Fine crystalline spinel, evenly distributed in magnesiabased brick, is prone to reacting with lime-containing phases from clinker to form low melting phases and a belite-enriched zone at the clinker/brick interface. This reaction positively contributes to the high adherence on a magnesiaÀspinel brick. The high content of liquid in clinker with low SR accelerates reactions between spinel and clinker, while a limited reaction occurs at the brick/clinker interface with high silica.

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“…The coating is a clinker layer adhered to the brick surface and has become one of the main requirements for basic bricks in cement rotary kiln. It can work as a protection of the refractory lining against infiltrations, thermal shock and thermal overload, besides reducing the thermal losses through the kiln shell [5][6][7]. It must be stable and well adhered to the brick surface, otherwise the 145 fluctuations in the kiln operating conditions can cause it to fall out and consequently expose the refractory to aggressive environment [5].…”

Section: Introductionmentioning

confidence: 99%

Qualitative and Quantitative Coating Tests: A Comparison in Magnesia–Spinel Refractory Bricks

Pacheco¹,

Gonçalves²,

Lins

2020

Ceramics

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In cement processing, which involves the production of clinker in rotary kilns, the main refractories used in the transition and burning zones are magnesia–spinel bricks. These bricks present suitable chemical and thermomechanical properties, not to mention that they can be easily landfilled. Among the main wear mechanisms of these bricks in the kiln, the infiltration of alkaline salts is noteworthy and occurs through the open pores of the refractory. In this way, the coating—a clinker layer adhered to the brick surface—appears as a protection mechanism of the lining against infiltration. Thus, the objective of this investigation is to run a qualitative coating test based on the contact method, and quantitative coating test based on the sandwich method to check the suitability of the methodologies and to evaluate the coating adherence on two different magnesia–spinel bricks. It was possible to distinguish the superior adherence ability of brick B in both coatings due to the higher porosity and the presence of nonreacted ZrO2. Despite the similarity between the test results, the quantitative sandwich-coating test is preferable because it does not depend on subjective analysis.

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Bonding of Cement Clinker onto Doloma‐Based Refractories

Cited by 19 publications

References 2 publications

Effect of SiO<sub>2</sub> addition on the synthesis of hercynite with high purity

Effect of SiO<sub>2</sub> addition on the synthesis of hercynite with high purity

Reaction Characteristics of Magnesia–Spinel Refractories with Cement Clinker

Qualitative and Quantitative Coating Tests: A Comparison in Magnesia–Spinel Refractory Bricks

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